GA342A1XGF270JW31#_技术文档

Safety Standard Certified Chip Multilayer Ceramic Capacitors for General Purpose

GA342A1XGF270JW31_(4520M(1808), SL(JIS), 27pF, AC 250V)

_:Package

Reference Sheet

Product specifications in this catalog are as of Oct.18,2022, and are subject to change or obsolescence without notice.

Please consult the approval sheet before ordering. Please read rating and !Cautions first.

■ Scope

This specification is applied to following safety standard certified Chip Multilayer Ceramic Capacitors Type GF. Type GF is safety standard certified Chip Multilayer Ceramic Capacitors of IEC60384-14 Class:Y2, ClassX1/Y2.

＜Standard No/*Certificate No＞

Size:4.5x2.0mm UL,cUL:UL60950-1,CSA 22.2/E316111、SEMKO:EN60384-14,IEC60384-14/1905542(Certified except for insulating distance

and applicabie only for the instruments critified by EN/IEC60950-1)

Size:5.7x2.8mm Min. UL,cUL:UL60384-14,CSA E60384-14/E37921、VDE:EN60384-14,IEC60384-14/40024096、SEMKO:EN60384-14,IEC60384-14/1905543

*Above Certificate No. may be changed on account of the revision of standards and the renewal of certification.

Do not use these products in any automotive power train or safety equipment including battery chargers for electric vehicles and plugin hybrids.

■ MURATA Part No. System

(Ex.)

GA3

42

②Dimension

(L×W)

A

③Dimension

(T)

1X

GF

270

J

W31

L

⑤Certified Type

①Series

④Temperature

Characteristics

⑥Capacitance

⑦Capacitance

Tolerance

⑧Individual

Specification

⑨Package

■ Type & Dimension

image:Dimension

image:Marking

4520M(1808)

② W

2.0+/-0.2

(in mm)

Size Code：

② L

e

g

③ T

1.0+0/-0.3

4.5+/-0.3

0.3 min.

2.5 min.

■ Rated Value

④Temperature Characteristics [1X]

(Public STD Code：[SL(JIS)])

⑦

⑥

Mounting

Method

Rated Voltage

Operating Temp. Range

Capacitance

Tolerance

Capacitance

Temp. coeff. or Cap. Change

-1000 to 350 ppm/℃

Temp. Range

Ref.Temp.

20 to 85℃

20℃

AC 250V

27pF

+/-5%

-55 to 125℃

Reflow

⑧Individual Specification : This denotes Murata control code.

■ Package

⑨Package

Packaging

φ180mm Reel Plastic Tape W12P4

Standard Packing Quantity

3000 pcs./Reel

L

GA342A1XGF270JW31-B0B

1

■ Specifications and Test Methods

No Item

1 Appearance

Specification

Test Method(Ref. Standard:JIS C 5101, IEC60384）

No defects or abnormalities.

Shown in Dimension.

Visual inspection

Using Measuring instrument of dimension.

2 Dimension

No defects or abnormalities.

Measurement Point

Test Voltage

Applied Time

Between the terminations

AC2000Vrms

60+/-1s

3 Voltage proof

Charge/discharge current 50mA max.

No self healing break downs or flash-overs have taken place in the capacitor.

Waveform

4 Impulse voltage

Applied Times

10 impulse of alternating polarity is subjected. (5 impulse for each polarity)

The interval between impulse is 60seconds.

2.5kVo-p

Applied Voltage

Measurement Temperature

Measurement Point

Measurement Voltage

Charging Time

More than 6000MΩ

Room Temperature

Between the terminations

DC500+/-50V

5 Insulation

Resistance(I.R.)

(Room Temperature)

60+/-5s

Charge/discharge current 50mA max.

Measurement Temperature

Shown in Rated value.

Room Temperature

6 Capacitance

Measurement Frequency 1.0+/-0.1MHz

Measurement Voltage

1.0+/-0.2Vrms

Measurement Temperature

Q≧400+20C C:Nominal Capacitance(pF)

Room Temperature

7 Q or Dissipation Factor

(D.F.)

Measurement Frequency 1.0+/-0.1MHz

Measurement Voltage

1.0+/-0.2Vrms

GA342A1XGF270JW31-B0B

2

■ Specifications and Test Methods

No Item

8 Temperature

Specification

Test Method(Ref. Standard:JIS C 5101, IEC60384）

No bias

Nominal values of the temperature coefficientis is

shown in Rated value. But, the Capacitance Change

under Reference Temperature is shown inTable A.

Capacitance Drift: Within +/-1.0% or +/-0.05pF

(Whichever is larger.)

The capacitance change should be measured after 5 min at each specified temp. stage.

Capacitance value as a reference is the value in "*" marked step.

Characteristics of

Capacitance

Capacitance Drift

The capacitance drift is calculated by dividing the differences between the maximum and minimum

measured values in the step 1,3 and 5 by the cap. value in step 3.

Less than 1.0Vrms (Refer to the individual data sheet)

Measurement Voltage

Temperature Step

No removal of the terminations or other defect should occur.

Mounting method

Applied Force

Reflow solder the capacitor on the test substrate

10N

9 Adhesive Strength of

Termination

Holding Time

10+/-1s

Applied Direction

In parallel with the test substrate and vertical with the capacitor side

Appearance

Capacitance

Q or D.F.

No defects or abnormalities.

Within the specified initial value.

Mounting method

Kind of Vibration

Vibration Time

Solder the capacitor on the test substrate

A simple harmonic motion 10Hz to 55Hz to 10Hz

1min

10 Vibration

Total amplitude

1.5mm

Vibration directions and time

This motion should be applied for a period of 2hours in each 3 mutually

perpendicular directions(total of 6hours).

Appearance

Capacitance Change

No defects or abnormalities.

Within +/-2%

Mounting method

Flexure

Holding Time

Reflow solder the capacitor on the test substrate(100×40mm)

1mm

5+/-1s

11 Substrate Bending test

12 Solderability

95% of the terminations is to be soldered evenly and continuously.

Test Method

Flux

Preheat

Kind of Solder

Test Temperature

Test Time

Solder bath method

Solution of rosin ethanol 25(mass)%

80℃ to 120℃、10s to 30s

Sn-3.0Ag-0.5Cu(Lead Free Solder)

245+/-5℃

2+/-0.5s

Immersing in speed

25+/-2.5mm/s

Appearance

Capacitance Change

I.R.

No defects or abnormalities.

Within +/-2%

More than 1000MΩ

Test Method

Solder bath method

Sn-3.0Ag-0.5Cu(Lead Free Solder)

260+/-5℃

10+/-1s

13 Resistance to Soldering

Heat

Kind of Solder

Test Temperature

Test Time

Voltage proof

No defects or abnormalities.

Preheat Temperature

Preheat time

100℃ to 120℃ and 170℃ to 200℃

Each 1 min

Immersing in speed

Post-treatment

25+/-2.5mm/s

Non treatment:Let sit for 24+/-2hours at room temperature, then measure.

GA342A1XGF270JW31-B0B

3

■ Specifications and Test Methods

No Item

Specification

Test Method(Ref. Standard:JIS C 5101, IEC60384）

Appearance

Capacitance Change

Q or D.F.

No defects or abnormalities.

Within +/-2%

Within the specified initial value.

More than 3000MΩ

Mounting method

Cycles

Temperature Cycling

Solder the capacitor on the test substrate

5cycles

14 Temperature Sudden

Change

I.R.

Voltage proof

No defects or abnormalities.

Post-treatment

Non treatment:Let sit for 24+/-2hours at room temperature, then measure.

Appearance

Capacitance Change

Q or D.F.

No defects or abnormalities.

Within +/-2%

Q≧275+5/2C C:Nominal Capacitance(pF)

More than 3000MΩ

Mounting method

Pre-test

Solder the capacitor on the test substrate

Before this test, the test shown in the following is performed.

・Adhesive Strength of Termination(apply force : 5N)

・Substrate Bending test

15 High Temperature High

Humidity (Steady)

I.R.

Voltage proof

No defects or abnormalities.

Test Temperature

Test Humidity

Test Time

40+/-2℃

90%RH to 95%RH

500+24/-0h

Test Voltage

Rated Voltage

Charge/discharge current 50mA max.

Post-treatment

Non treatment:Let sit for 24+/-2hours at room temperature, then measure.

Appearance

Capacitance Change

Q or D.F.

No defects or abnormalities.

Within +/-2%

Q≧275+5/2C C:Nominal Capacitance(pF)

More than 3000MΩ

Mounting method

Pre-test

Solder the capacitor on the test substrate

Before this test, the test shown in the following is performed.

・Adhesive Strength of Termination(apply force : 5N)

・Substrate Bending test

16 Durability

I.R.

Voltage proof

No defects or abnormalities.

・Impulse voltage (Applied Voltage:5kVo-p, Applied Times:3 times)

125+2/-0℃

50%RH max.

Test Temperature

Test Humidity

Test Time

1000+48/-0h

Test Voltage

AC425Vrms (except that once each hour the voltage is

increased to AC1000Vrms for 0.1second.)

Charge/discharge current 50mA max.

Post-treatment

Non treatment:Let sit for 24+/-2hours at room temperature, then measure.

GA342A1XGF270JW31-B0B

4

■ Specifications and Test Methods

No Item

17 Passive flammability

Specification

Test Method(Ref. Standard:JIS C 5101, IEC60384）

The burning time shall not be exceeded the time 30s. The tissue paper shall not ignite. The capacitor under test shall be held in the flame in the position which best promotes burning.

Each specimen shall only be exposed once to the flame. Time of exposure to flame : 30 s.

Length of flame

Gas burner

12+/-1mm

Length 35mm min.

Inside dia 0.5+/-0.1mm

Outside dia 0.9mm max.

Butane gas purity 95% min.

Gas

Test method (schematic)

The cheesecloth shall not be on fire.

The specimens shall be individually wrapped in at least one but more than

two complete layers of cheesecloth.

18 Active flammability

The specimens shall be subjected to 20discharges.

The interval between successive discharges shall be 5seconds.

The UAC shall be maintained for 2minutes after the last discharge.

Test circuit diagram

Discharge voltage waveform

GA342A1XGF270JW31-B0B

5

Table A Capacitance Change between at Reference Temp. and at each Temp. (%)

-55℃

-25℃

-10℃

Char.

1X

Max.

-

Min.

-

Max.

-

Min.

-

Max.

-

Min.

-

Substrate Bending test

Except for Substrate Bending test

・Test substrate

Material

Thickness

・Test substrate

Material

Thickness

JIS C 6484 Copper-clad laminated sheets for PCBs (Glass fabric base, epoxy resin)

1.6mm

JIS C 6484 Copper-clad laminated sheets for PCBs (Glass fabric base, epoxy resin)

1.6mm

Copper Foil Thickness 0.035mm

Kind of Solder

Sn-3.0Ag-0.5Cu(Lead Free Solder)

Kind of Solder

Sn-3.0Ag-0.5Cu(Lead Free Solder)

・Land Dimension

Dimension(mm)

b

Dimension(mm)

b

Type

a

c

a

c

GA342

3.5

7.0

2.4

GA342

3.5

7.0

2.4

・Pressurization Method

GA342A1XGF270JW31-B0B

6

■ Package（Tape Carrier Packaging）

1. Minimum Quantity(pcs./reel)

φ180mm Reel(W12P4)

Plastic Tape

Type

GA342

CODE：L

3000

A

2. Dimensions of Tape (in mm)

(1)GA342(W12P4 CODE：L)

Dimensions(Chip)

Type

L

A

B

C

D

E

F

G

H

J

K

L

W

T

GA342

4.5+/-0.3

2.0+/-0.2

1.0+0/-0.3

2.5(Typ.)

5.1(Typ.)

12.0+/-0.3

5.5+/-0.05

1.75+/-0.1

4.0+/-0.1

2.0+/-0.05

4.0+/-0.1

φ1.5+0.1/-0

3.7 max.

0.3+/-0.1

A

GA342A1XGF270JW31-B0B

ꢀ7

■ Package（Tape Carrier Packaging）

3. Dimensions of Reel (in mm)

Reel

A

B

C

D

E

W

W1

φ180mm Reel

φ180+0/-3.0

φ60 min.

φ13+/-0.2

φ21+/-0.8

2.0+/-0.5

18.4 max.

12.4+2

GA342A1XGF270JW31-B0B

ꢀ8

■ Package（Tape Carrier Packaging）

4. Part of the leader and part of the vacant section are attached as follows.

The sprocket holes are to the right as the tape is pulled toward the user.

5. Accumulate tolerance of sprocket holes pitch = +/-0.3mm/10 pitch

6. Chip in the tape is enclosed by top tape and bottom tape as shown in 2.Dimensions of Tape.

7. The top tape and carrier tape are not attached at the end of the tape for a minimum of 5 pitches.

8. There are no jointing for top tape and bottom tape.

9. There are no fuzz in the cavity.

10. Break down force of top tape : 5N min.

Break down force of bottom tape : 5N min. (Only a bottom tape existence )

11. Reel is made by resin and appeaser and dimension is shown in 3.Dimensions of Reel.

There are possibly to change the material and dimension due to some impairment.

ꢀ

12. Peeling off force : 0.1N to 0.6N in the direction as shown below.

Speed of Peeling off : 300 mm / min

13. Label that show the customer parts number, our parts number, our company name, inspection

number and quantity, will be put in outside of reel.

GA342A1XGF270JW31-B0B

ꢀ9

Caution

■Limitation of Applications

Please contact us before using our products for the applications listed below which require especially high reliability for the prevention of defects which might directly cause damage to the third party's life, body or property.

ꢀ

①Aircraft equipmentꢀ②Aerospace equipmentꢀ③Undersea equipmentꢀ④Power plant control equipmentꢀ⑤Medical equipmentꢀ⑥Transportation equipment(vehicles,trains,ships,etc.)ꢀ⑦Traffic signal equipment

⑧Disaster prevention / crime prevention equipmentꢀ⑨Data-processing equipmentꢀ⑩Application of similar complexity and/or reliability requirements to the applications listed in the above.

ꢀ

■Storage and Operation condition

1. The performance of chip multilayer ceramic capacitors (henceforth just "capacitors") may be affected by the storage conditions. Please use them promptly after delivery.

ꢀ1-1. Please maintain an appropriate storage condition for capacitors using the following conditions.

･A temperature is +5℃ to +40℃ and a relative humidity is 20% to 70% as a standard condition.

･The temperature recommendation is less than 30℃.

High temperature and humidity conditions and/or prolonged storage may cause deterioration of the packaging materials. If more than six months have elapsed since delivery, check packaging, mounting, etc. before use.

In addition, this may cause oxidation of the electrodes. If more than one year has elapsed since delivery, also check the solderability before use.

ꢀ1-2. Corrosive gas can react with the termination (external) electrodes or lead wires of capacitors, and result in poor solderability.

Do not store the capacitors in an atmosphere consisting of corrosive gas (e.g.,hydrogen sulfide, sulfur dioxide, chlorine, ammonia gas etc.).

ꢀ1-3. Due to moisture condensation caused by rapid humidity changes, or the photochemical change caused by direct sunlight on the terminal electrodes, the solderability and electrical performance may deteriorate.

Do not store capacitors under direct sunlight or in high huimidity conditions.

GA342A1XGF270JW31-B0B

10

■Rating

1. Temperature Dependent Characteristics

1. The electrical characteristics of the capacitor can change with temperature.

ꢀ1-1. For capacitors having larger temperature dependency, the capacitance may change with temperature changes. The following actions are recommended in order to ensure suitable capacitance values.

(1) Select a suitable capacitance for the operating temperature range.

(2) The capacitance may change within the rated temperature. When you use a high dielectric constant type capacitor in a circuit that needs a tight (narrow) capacitance tolerance (e.g., a time-constant circuit),

ꢀꢀꢀplease carefully consider the temperature characteristics, and carefully confirm the various characteristics in actual use conditions and the actual system.

2. Measurement of Capacitance

1. Measure capacitance with the voltage and frequency specified in the product specifications.

ꢀ1-1. The output voltage of the measuring equipment may decrease occasionally when capacitance is high. Please confirm whether a prescribed measured voltage is impressed to the capacitor.

ꢀ1-2. The capacitance values of high dielectric constant type capacitors change depending on the AC voltage applied. Please consider the AC voltage characteristics when selecting a capacitor to be used in a AC circuit.

3. Applied Voltage

1. Do not apply a voltage to the capacitor that exceeds the rated voltage as called out in the specifications.

ꢀ1-1. Applied voltage between the terminals of a capacitor shall be less than or equal to the rated voltage.

(1) When AC voltage is superimposed on DC voltage, the zero-to-peak voltage shall not exceed the rated DC voltage. When AC voltage or pulse voltage is applied, the peak-to-peak voltage shall not exceed the rated DC voltage.

(2) Abnormal voltages (surge voltage, static electricity, pulse voltage, etc.) shall not exceed the rated DC voltage.

Typical Voltage Applied to the DC capacitor

DC Voltage

DC Voltage+AC

AC Voltage

Pulse Voltage

(E：Maximum possible applied voltage.)

ꢀ1-2. Influence of over voltage

Over voltage that is applied to the capacitor may result in an electrical short circuit caused by the breakdown of the internal dielectric layers. The time duration until breakdown depends on the applied voltage and the ambient temperature.

2. Use a safety standard certified capacitor in a power supply input circuit (AC filter), as it is also necessary to consider the withstand voltage and impulse withstand voltage defined for each device.

GA342A1XGF270JW31-B0B

11

4. Type of Applied Voltage and Self-heating Temperature

1. Confirm the operating conditions to make sure that no large current is flowing into the capacitor due to the continuous application of an AC voltage or pulse voltage.

ꢀ When a DC rated voltage product is used in an AC voltage circuit or a pulse voltage circuit, the AC current or pulse current will flow into the capacitor; therefore check the self-heating condition.

ꢀ Please confirm the surface temperature of the capacitor so that the temperature remains within the upper limits of the operating temperature, including the rise in temperature due to self-heating.

ꢀ When the capacitor is used with a high-frequency voltage or pulse voltage, heat may be generated by dielectric loss.

< Applicable to Temperature Characteristic X7R(R7) >

ꢀ1-1. The load should be contained so that the self-heating of the capacitor body remains below 20°C, when measuring at an ambient temperature of 25°C.

In addition, use a K thermocouple of ø0.1mm with less heat capacity when measuring, and measure in a condition where there is no effect from the radiant heat of other components or air flow caused by convection.

Excessive generation of heat may cause deterioration of the characteristics and reliability of the capacitor.

(Absolutely do not perform measurements while the cooling fan is operating, as an accurate measurement may not be performed.)

5. DC Voltage and AC Voltage Characteristic

1. The capacitance value of a high dielectric constant type capacitor changes depending on the DC voltage applied. Please consider the DC voltage characteristics when a capacitor is selected for use in a DC circuit.

ꢀ1-1. The capacitance of ceramic capacitors may change sharply depending on the applied voltage. (See figure) Please confirm the following in order to secure the capacitance.

(1) Determine whether the capacitance change caused by the applied voltage is within the allowed range .

(2) In the DC voltage characteristics, the rate of capacitance change becomes larger as voltageincreases, even if the applied voltage is below the rated voltage.

When a high dielectric constant type capacitor is used in a circuit that requires a tight (narrow) capacitance tolerance (e.g., a time constant circuit),

please carefully consider the voltage characteristics, and confirm the various characteristics in the actual operating conditions of the system.

2. The capacitance values of high dielectric constant type capacitors changes depending on the AC voltage applied. Please consider the AC voltage characteristics when selecting a capacitor to be used in an AC circuit.

6. Capacitance Aging

1. The high dielectric constant type capacitors have an Aging characteristic in which the capacitance value decreases with the passage of time. When you use a high dielectric constant type capacitors

in a circuit that needs a tight (narrow) capacitance tolerance (e.g., a time-constant circuit), please carefully consider the characteristics of these capacitors, such as their aging, voltage, and temperature characteristics.

In addition, check capacitors using your actual appliances at the intended environment and operating conditions.

7. Vibration and Shock

1. Please confirm the kind of vibration and/or shock, its condition, and any generation of resonance.

ꢀꢀPlease mount the capacitor so as not to generate resonance, and do not allow any impact on the terminals.

2. Mechanical shock due to being dropped may cause damage or a crack in the dielectric material of the capacitor.

ꢀꢀDo not use a dropped capacitor because the quality and reliability may be deteriorated.

3. When printed circuit boards are piled up or handled, the corner of another printed circuit board

ꢀꢀshould not be allowed to hit the capacitor in order to avoid a crack or other damage to the capacitor.

GA342A1XGF270JW31-B0B

12

■Soldering and Mounting

1. Mounting Position

1. Confirm the best mounting position and direction that minimizes the stress imposed on the capacitor during flexing or bending the printed circuit board.

ꢀ1-1. Choose a mounting position that minimizes the stress imposed on the chip during flexing or bending of the board.

[ Component Direction ]

Locate chip horizontal to the

direction in which stress acts.

(Bad Example)

(Good Example)

[ Chip Mounting Close to Board Separation Point ]

It is effective to implement the following measures, to reduce stress in separating the board.

It is best to implement all of the following three measures; however, implement as many measures as possible to reduce stress.

Contents of Measures

Stress Level

Aꢀ>ꢀD *1

Aꢀ>ꢀB

(1) Turn the mounting direction of the component parallel to the board separation surface.

(2) Add slits in the board separation part.

(3) Keep the mounting position of the component away from the board separation surface.

*1 A > D is valid when stress is added vertically to the perforation as with Hand Separation.

If a Cutting Disc is used, stress will be diagonal to the PCB, therefore A > D is invalid.

Aꢀ>ꢀC

[ Mounting Capacitors Near Screw Holes ]

When a capacitor is mounted near a screw hole, it may be affected by the board deflection that occurs during the tightening of the screw.

Mount the capacitor in a position as far away from the screw holes as possible.

ꢀ

2. Information before Mounting

ꢀ1. Do not re-use capacitors that were removed from the equipment.

ꢀ2. Confirm capacitance characteristics under actual applied voltage.

ꢀ3. Confirm the mechanical stress under actual process and equipment use.

ꢀ4. Confirm the rated capacitance, rated voltage and other electrical characteristics before assembly.

ꢀ5. Prior to use, confirm the solderability of capacitors that were in long-term storage.

ꢀ6. Prior to measuring capacitance, carry out a heat treatment for capacitors that were in long-term storage.

ꢀ7. The use of Sn-Zn based solder will deteriorate the reliability of the MLCC. Please contact our sales representative or product engineers on the use of Sn-Zn based solder in advance.

GA342A1XGF270JW31-B0B

13

3. Maintenance of the Mounting (pick and place) Machine

1. Make sure that the following excessive forces are not applied to the capacitors. Check the mounting in the actual device under actual use conditions ahead of time.

ꢀ1-1. In mounting the capacitors on the printed circuit board, any bending force against them shall be kept to a minimum to prevent them from any damage or cracking.

Please take into account the following precautions and recommendations for use in your process.

(1) Adjust the lowest position of the pickup nozzle so as not to bend the printed circuit board.

[ Incorrect ]

[ Correct ]

2. Dirt particles and dust accumulated in the suction nozzle and suction mechanism prevent the nozzle from moving smoothly. This creates excessive force on the capacitor during mounting, causing cracked chips.

Also, the locating claw, when worn out, imposes uneven forces on the chip when positioning, causing cracked chips. The suction nozzle and the locating claw must be maintained, checked and replaced periodically.

GA342A1XGF270JW31-B0B

14

[ Standard Conditions for Reflow Soldering ]

4-1. Reflow Soldering

1. When sudden heat is applied to the components, the mechanical strength of the components will decrease

because a sudden temperature change causes deformation inside the components.

In order to prevent mechanical damage to the components, preheating is required for both the components and the PCB.

Preheating conditions are shown in table 1.

It is required to keep the temperature differential between the solder and the components surface (ΔT) as small as possible.

2. When components are immersed in solvent after mounting, be sure to maintain the temperature difference (ΔT)

between the component and the solvent within the range shown in the table 1.

[ Allowable Reflow Soldering Temperature and Time ]

Table 1

Series

Chip Dimension(L/W) Code

42/43/52/55

Temperature Differenti

GA□

ΔT≦130℃

Recommended Conditions

Item

Lead Free Solder

Peak Temperature

Atmosphere

240 to 260℃

Air or N₂

Lead Free Solder ： Sn-3.0Ag-0.5Cu

In the case of repeated soldering, the accumulated

soldering time must be within the range shown above.

3. When a capacitor is mounted at a temperature lower than the peak reflow temperature recommended by the solder manufacturer, the following quality problems can occur.

Consider factors such as the placement of peripheral components and the reflow temperature setting to prevent the capacitor’s reflow temperature from dropping below the peak temperature specified.

Be sure to evaluate the mounting situation beforehand and verify that none of the following problems occur.

・Drop in solder wettability

・Solder voids

・Possible occurrence of whiskering

・Drop in bonding strength

・Drop in self-alignment properties

・Possible occurrence of tombstones and/or shifting on the land patterns of the circuit board

4. Optimum Solder Amount for Reflow Soldering

ꢀ4-1. Overly thick application of solder paste results in a excessive solder fillet height. This makes the chip more susceptible to mechanical and thermal stress on the board and may cause the chips to crack.

ꢀ4-2. Too little solder paste results in a lack of adhesive strength on the termination, which may result in chips breaking loose from the PCB.

ꢀ4-3. Please confirm that solder has been applied smoothly to the termination.

Inverting the PCB

Make sure not to impose any abnormal mechanical shocks to the PCB.

GA342A1XGF270JW31-B0B

15

4-2. Flow Soldering

1. This product is not apply flow soldering.

4-3. Correction of Soldered Portion

When sudden heat is applied to the capacitor, distortion caused by the large temperature difference occurs internally, and can be the cause of cracks.

Capacitors also tend to be affected by mechanical and thermal stress depending on the board preheating temperature or the soldering fillet shape, and can be the cause of cracks.

Please refer to "1. PCB Design" or "3. Optimum solder amount" for the solder amount and the fillet shapes.

1. Correction with a Soldering Iron

ꢀ1-1. In order to reduce damage to the capacitor, be sure to preheat the capacitor and the mounting board. Preheat to the temperature range shown in Table 3. A hot plate, hot air type preheater, etc. can be used for preheating.

ꢀ1-2. After soldering, do not allow the component/PCB to cool down rapidly.

ꢀ1-3. Perform the corrections with a soldering iron as quickly as possible. If the soldering iron is applied too long, there is a possibility of causing solder leaching on the terminal electrodes,

which will cause deterioration of the adhesive strength and other problems.

Table 3

Chip Dimension

(L/W) Code

Temperature of

Soldering Iron Tip

Preheating

Temperature

Differential(ΔT)

Series

Atmosphere

Air

GA□

42/43/52/55

280℃ max.

150℃ min.

ΔT≦130℃

Lead Free Solder : Sn-3.0Ag-0.5Cu

*Please manage Δ T in the temperature of soldering iron and the preheating temperature.

2. Correction with Spot Heater

Compared to local heating with a soldering iron, hot air heating by a spot heater heats the overall component and board, therefore, it tends to lessen the thermal shock.

In the case of a high density mounted board, a spot heater can also prevent concerns of the soldering iron making direct contact with the component.

ꢀ2-1. If the distance from the hot air outlet of the spot heater to the component is too close, cracks may occur due to thermal shock. To prevent this problem, follow the conditions shown in Table 4.

ꢀ2-2. In order to create an appropriate solder fillet shape, it is recommended that hot air be applied at the angle shown in Figure 1.

Table 4

Distance

Hot Air Application angle

5mm or more

45° *Figure 1

Hot Air Temperature Nozzle Outlet 400°C max.

Application Time Less than 30s

3. Optimum solder amount when re-working with a soldering iron

ꢀ3-1. If the solder amount is excessive, the risk of cracking is higher during board bending or any other stressful condition.

Too little solder amount results in a lack of adhesive strength on the termination, which may result in chips breaking loose from the PCB.

Please confirm that solder has been applied smoothly is and rising to the end surface of the chip.

3-2. A soldering iron with a tip of ø3mm or smaller should be used.

It is also necessary to keep the soldering iron from touching the components during the re-work.

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5. Washing

Excessive ultrasonic oscillation during cleaning can cause the PCBs to resonate, resulting in cracked chips or broken solder joints.

Before starting your production process, test your cleaning equipment / process to insure it does not degrade the capacitors.

6. Electrical Test on Printed Circuit Board

1. Confirm position of the support pin or specific jig, when inspecting the electrical performance of a capacitor after mounting on the printed circuit board.

ꢀ1-1. Avoid bending the printed circuit board by the pressure of a test-probe, etc. The thrusting force of the test probe can flex the PCB, resulting in cracked chips or open solder joints.

Provide support pins on the back side of the PCB to prevent warping or flexing. Install support pins as close to the test-probe as possible.

ꢀ1-2. Avoid vibration of the board by shock when a test -probe contacts a printed circuit board.

[ Not Recommended ]

[ Recommended ]

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7. Printed Circuit Board Cropping

1. After mounting a capacitor on a printed circuit board, do not apply any stress to the capacitor that caused bending or twisting the board.

ꢀ1-1. In cropping the board, the stress as shown may cause the capacitor to crack. Cracked capacitors may cause deterioration of the insulation resistance, and result in a short.

Avoid this type of stress to a capacitor.

[ Twisting ]

[ Bending ]

2. Check the cropping method for the printed circuit board in advance.

2-1. Printed circuit board cropping shall be carried out by using a jig or an apparatus (Disc separator, router type separator, etc.) to prevent the mechanical stress that can occur to the board.

Hand Separation

Nipper Separation

Board Separation Apparatus

Board Separation Method

(1) Board Separation Jig

(2) Disc Separator

(3) Router Type Separator

Level of stress on board

Recommended

High

×

Medium

△*

Medium

△*

Low

◯

· Board handling

· Layout of slits

· Design of V groove

· Arrangement of blades

· Controlling blade life

Hand and nipper

separation apply a high

level of stress.

· Board handling

· Board bending direction

· Layout of capacitors

Notes

Board handling

Use another method.

* When a board separation jig or disc separator is used, if the following precautions are not observed, a large board deflection stress will occur and the capacitors may crack.

ꢀ Use router type separator if at all possible.

(1) Example of a suitable jig

[ In the case of Single-side Mounting ]

An outline of the board separation jig is shown as follows.

Recommended example: Stress on the component mounting position can be minimized by holding the portion close to the jig, and bend in the direction towards the side where the capacitors are mounted.

Not recommended example: The risk of cracks occurring in the capacitors increases due to large stress being applied to the component mounting position, if the portion away from the jig is held and bent in the

direction opposite the side where the capacitors are mounted.

[ Outline of jig ]

[ Hand Separation ]

Recommended

Not recommended

[ In the case of Double-sided Mounting ]

Since components are mounted on both sides of the board, the risk of cracks occurring can not be avoided with the above method. Therefore, implement the following measures to prevent stress from being applied to the components.

(Measures)

(1) Consider introducing a router type separator.ꢀIf it is difficult to introduce a router type separator, implement the following measures. (Refer to item 1. Mounting Position)

(2) Mount the components parallel to the board separation surface.

(3) When mounting components near the board separation point, add slits in the separation position near the component.

(4) Keep the mounting position of the components away from the board separation point.

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(2) Example of a Disc Separator

An outline of a disc separator is shown as follows. As shown in the Principle of Operation, the top blade and bottom blade are aligned with the V-grooves on the printed circuit board to separate the board.

In the following case, board deflection stress will be applied and cause cracks in the capacitors.

(1) When the adjustment of the top and bottom blades are misaligned, such as deviating in the top-bottom, left-right or front-rear directions

(2) The angle of the V groove is too low, depth of the V groove is too shallow, or the V groove is misaligned top-bottom

If V groove is too deep, it is possible to brake when you handle and carry it. Carefully design depth of the V groove with consideration about strength of material of the printed circuit board.

[ Outline of Machine ]

[ Principle of Operation ]

[ Cross-section Diagram ]

[ Disc Separator ]

Not recommended

Left-right Misalignment

Top Blade

Recommended

Top-bottom Misalignment

Top Blade

Front-rear Misalignment

Top Blade

Bottom Blade

[ V-groove Design ]

Example of Recommended

V-groove Design

Not Recommended

Depth too Shallow

Left-right Misalignment

Low-Angle

Depth too Deep

(3) Example of Router Type Separator

The router type separator performs cutting by a router rotating at a high speed. Since the board does not bend in the cutting process, stress on the board can be suppressed during board separation.

When attaching or removing boards to/from the router type separator, carefully handle the boards to prevent bending.

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8. Assembly

1. Handling

ꢀꢀIf a board mounted with capacitors is held with one hand, the board may bend. Firmly hold the edges of the board with both hands when handling.

ꢀꢀIf a board mounted with capacitors is dropped, cracks may occur in the capacitors. Do not use dropped boards, as there is a possibility that the quality of the capacitors may be impaired.

2. Attachment of Other Components

ꢀ2-1. Mounting of Other Components

Pay attention to the following items, when mounting other components on the back side of the board after capacitors have been mounted on the opposite side.

When the bottom dead point of the suction nozzle is set too low, board deflection stress may be applied to the capacitors on the back side (bottom side), and cracks may occur in the capacitors.

・After the board is straightened, set the bottom dead point of the nozzle on the upper surface of the board.

・Periodically check and adjust the bottom dead point.

ꢀ2-2. Inserting Components with Leads into Boards

When inserting components (transformers, IC, etc.) into boards, bending the board may cause cracks in the capacitors or cracks in the solder. Pay attention to the following.

・Increase the size of the holes to insert the leads, to reduce the stress on the board during insertion.

・Fix the board with support pins or a dedicated jig before insertion.

・Support below the board so that the board does not bend. When using support pins on the board, periodically confirm that there is no difference in the height of each support pin.

ꢀ2-3. Attaching/Removing Sockets and/or Connectors

Insertion and removal of sockets and connectors, etc., might cause the board to bend.

Please insure that the board does not warp during insertion and removal of sockets and connectors, etc., or the bending may damage mounted components on the board.

ꢀ2-4. Tightening Screws

The board may be bent, when tightening screws, etc. during the attachment of the board to a shield or chassis. Pay attention to the following items before performing the work.

・Plan the work to prevent the board from bending.

・Use a torque screwdriver, to prevent over-tightening of the screws.

・The board may bend after mounting by reflow soldering, etc. Please note, as stress may be applied to the chips by forcibly flattening the board when tightening the screws.

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■Others

1. Under Operation of Equipment

ꢀ1-1. Do not touch a capacitor directly with bare hands during operation in order to avoid the danger of an electric shock.

ꢀ1-2. Do not allow the terminals of a capacitor to come in contact with any conductive objects (short-circuit).

Do not expose a capacitor to a conductive liquid, inducing any acid or alkali solutions.

ꢀ1-3. Confirm the environment in which the equipment will operate is under the specified conditions.

Do not use the equipment under the following environments.

(1) Being spattered with water or oil.

(2) Being exposed to direct sunlight.

(3) Being exposed to ozone, ultraviolet rays, or radiation.

(4) Being exposed to toxic gas (e.g., hydrogen sulfide, sulfur dioxide, chlorine, ammonia gas etc.)

(5) Any vibrations or mechanical shocks exceeding the specified limits.

(6) Moisture condensing environments.

ꢀ1-4. Use damp proof countermeasures if using under any conditions that can cause condensation.

2. Others

ꢀ2-1. In an Emergency

(1) If the equipment should generate smoke, fire, or smell, immediately turn off or unplug the equipment. If the equipment is not turned off or unplugged, the hazards may be worsened by supplying continuous power.

(2) In this type of situation, do not allow face and hands to come in contact with the capacitor or burns may be caused by the capacitor's high temperature.

ꢀ2-2. Disposal of waste

When capacitors are disposed of, they must be burned or buried by an industrial waste vendor with the appropriate licenses.

ꢀ2-3. Circuit Design

(1) Addition of Fail Safe Function

ꢀꢀ Capacitors that are cracked by dropping or bending of the board may cause deterioration of the insulation resistance, and result in a short.

ꢀꢀ If the circuit being used may cause an electrical shock, smoke or fire when a capacitor is shorted, be sure to install fail-safe functions, such as a fuse, to prevent secondary accidents.

(2) Capacitors used to prevent electromagnetic interference in the primary AC side circuit, or as a connection/insulation, must be a safety standard certified product, or satisfy the contents stipulated in the Electrical Appliance and

ꢀꢀ Material Safety Law. Install a fuse for each line in case of a short.

2-4. Test Condition for AC Withstanding Voltage

(1) Test Equipment

Test for AC withstanding voltage should be made with equipment capable of creating a wave similar to a 50/60 Hz sine wave.

(2) Voltage Applied Method

The capacitor's leads or terminals should be firmly connected to the output of the withstanding voltage test equipment , and then the voltage should be raised from near zero to the test voltage.

If the test voltage is applied directly to the capacitor without raising it from near zero, it should be applied with the zero cross. *At the end of the test time, the test voltage should be reduced to near zero, and then the capacitor's

leads or terminals should be taken off the output of the withstanding voltage test equipment.

If the test voltage is applied directly to the capacitor without raising it from near zero, surge voltage may occur and cause a defect.

*ZERO CROSS is the point where voltage sine wave passes 0V. - See the figure at right -

2-5. Remarks

Failure to follow the cautions may result, worst case, in a short circuit and smoking when the product is used.

The above notices are for standard applications and conditions. Contact us when the products are used in special mounting conditions.

Select optimum conditions for operation as they determine the reliability of the product after assembly. The data herein are given in typical values, not guaranteed ratings.

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Notice

■Rating

1. Operating Temperature

1. The operating temperature limit depends on the capacitor.

ꢀ1-1. Do not apply temperatures exceeding the maximum operating temperature.

It is necessary to select a capacitor with a suitable rated temperature that will cover the operating temperature range.

It is also necessary to consider the temperature distribution in equipment and the seasonal temperature variable factor.

ꢀ1-2. Consider the self-heating factor of the capacitor

The surface temperature of the capacitor shall not exceed the maximum operating temperature including self-heating.

2. Atmosphere Surroundings (gaseous and liquid)

1. Restriction on the operating environment of capacitors.

ꢀ1-1. The capacitor will short-circuit by water or brine. It may shorten the lifetime and may have the failure by the corrosion of terminals and the permeation of moisture into capacitor.

ꢀ1-2. The same phenomenon as the above may occur when the electrodes or terminals of the capacitor are subject to moisture condensation.

ꢀ1-3. The deterioration of characteristics and insulation resistance due to the oxidization or corrosion of terminal electrodes may result in breakdown

when the capacitor is exposed to corrosive or volatile gases or solvents for long periods of time.

3. Piezo-electric Phenomenon

1. When using high dielectric constant type capacitors in AC or pulse circuits, the capacitor itself vibrates at specific frequencies and noise may be generated.

Moreover, when the mechanical vibration or shock is added to capacitor, noise may occur.

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■Soldering and Mounting

1. PCB Design

1. Notice for Pattern Forms

ꢀ1-1. Unlike leaded components, chip components are susceptible to flexing stresses since they are mounted directly on the substrate.

ꢀThey are also more sensitive to mechanical and thermal stresses than leaded components.

ꢀExcess solder fillet height can multiply these stresses and cause chip cracking. When designing substrates, take land patterns and dimensions into consideration to eliminate the possibility of excess solder fillet height.

ꢀ1-2. There is a possibility of chip cracking caused by PCB expansion/contraction with heat, because stress on a chip is different depending on PCB material and structure.

ꢀWhen the thermal expansion coefficient greatly differs between the board used for mounting and the chip, it will cause cracking of the chip due to the thermal expansion and contraction.

ꢀWhen capacitors are mounted on a fluorine resin printed circuit board or on a single-layered glass epoxy board, it may also cause cracking of the chip for the same reason.

ꢀ1-3. If you are replacing by smaller capacitors, you should not only consider the Land size change but also consider changing the Wiring Width, Wiring direction,

ꢀand copper foil thickness because the risk of chip cracking is increased with just a Land size change.

Pattern Forms

Item

Prohibited

Correct

Placing Close to Chassis

in section

Placing of Chip Components

and Leaded Components

Placing of Leaded Components

after Chip Component

Lateral Mounting

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2. Land Dimensions

Please confirm the suitable land dimension by evaluating of the actual SET / PCB.

Table 1 Reflow Soldering Method

Chip Dimension

Series

Chip(L×W)

a

b

c

(L/W) Code

GA□

42

43

52

55

4.5×2.0

4.5×3.2

5.7×2.8

5.7×5.0

2.8 to 3.4

3.0 to 3.5

4.0 to 4.6

1.2 to 1.4

1.4 to 1.6

1.4 to 1.8

2.3 to 3.0

2.1 to 2.6

3.5 to 4.8

(in mm)

2-2. Dimensions of Slit (Example)

L×W

d

e

Preparing the slit helps flux cleaning and resin coating on the back of the capacitor.

However, the length of the slit design should be as short as possible

to prevent mechanical damage in the capacitor.

A longer slit design might receive more severe mechanical stress from the PCB.

Recommended slit design is shown in the Table.

4.5×2.0

4.5×3.2

5.7×2.8

5.7×5.0

1.0 to 2.8

1.0 to 4.0

3.6 to 4.1

4.8 to 5.3

4.4 to 4.9

6.6 to 7.1

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3. Board Design

When designing the board, keep in mind that the amount of strain which occurs will increase depending on the sizeand material of the board.

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2. Reflow soldering

The flux in the solder paste contains halogen-based substances and organic acids as activators.

Strong acidic flux can corrode the capacitor and degrade its performance. Please check the quality of capacitor after mounting.

3. Washing

1. Please evaluate the capacitor using actual cleaning equipment and conditions to confirm the quality, and select the solvent for cleaning.

2. Unsuitable cleaning may leave residual flux or other foreign substances, causing deterioration of electrical characteristics and the reliability of the capacitors.

4. Coating

1. A crack may be caused in the capacitor due to the stress of the thermal contraction of the resin during curing process.

The stress is affected by the amount of resin and curing contraction. Select a resin with low curing contraction.

The difference in the thermal expansion coefficient between a coating resin or a molding resin and the capacitor may cause the destruction and deterioration of the capacitor such as a crack or peeling,

and lead to the deterioration of insulation resistance or dielectric breakdown.

Select a resin for which the thermal expansion coefficient is as close to that of the capacitor as possible. A silicone resin can be used as an under-coating to buffer against the stress.

2. Select a resin that is less hygroscopic.

ꢀꢀUsing hygroscopic resins under high humidity conditions may cause the deterioration of the insulation resistance of a capacitor. An epoxy resin can be used as a less hygroscopic resin.

3. The halogen system substance and organic acid are included in coating material, and a chip corrodes by the kind of Coating material. Do not use strong acid type.

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■Others

1. Transportation

1. The performance of a capacitor may be affected by the conditions during transportation.

ꢀ1-1. The capacitors shall be protected against excessive temperature, humidity and mechanical force during transportation.

・Mechanical condition

ꢀꢀTransportation shall be done in such a way that the boxes are not deformed and forces are not directly passed on to the inner packaging.

ꢀ1-2. Do not apply excessive vibration, shock, or pressure to the capacitor.

(1) When excessive mechanical shock or pressure is applied to a capacitor, chipping or cracking may occur in the ceramic body of the capacitor.

(2) When the sharp edge of an air driver, a soldering iron, tweezers, a chassis, etc. impacts strongly on the surface of the capacitor, the capacitor may crack and short-circuit.

ꢀ1-3. Do not use a capacitor to which excessive shock was applied by dropping etc. A capacitor dropped accidentally during processing may be damaged.

2. Characteristics Evaluation in the Actual System

1. Evaluate the capacitor in the actual system, to confirm that there is no problem with the performance and specification values in a finished product before using.

2. Since a voltage dependency and temperature dependency exists in the capacitance of high dielectric type ceramic capacitors, the capacitance may change depending on the operating conditions in the actual system.

Therefore,be sure to evaluate the various characteristics, such as the leakage current and noise absorptivity, which will affect the capacitance value of the capacitor.

3. In addition,voltages exceeding the predetermined surge may be applied to the capacitor by the inductance in the actual system.

ꢀꢀEvaluate the surge resistance in the actual system as required.

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ꢀꢀꢀꢀꢀNOTE

1. Please make sure that your product has been evaluated in view of your specifications with our product being mounted to your product.

2. Your are requested not to use our product deviating from this product specification.

3. We consider it not appropriate to include any terms and conditions with regard to the business transaction in the product specifications, drawings or other technical documents.

ꢀꢀTherefore, if your technical documents as above include such terms and conditions such as warranty clause, product liability clause, or intellectual property infringement liability clause, they will be deemed to be invalid.

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型号：	GA342A1XGF270JW31#
厂家：	muRata
描述：	民用设备,工业设备,移动设备,植入式以外的医疗器械设备 [GHTF A/B/C],汽车[信息娱乐 / 舒适设备] 医疗医疗器械
文件：	总28页 (文件大小：1434K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

GA342A1XGF270JW31# [MURATA]

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