WF20M472_ZTL [WALSIN]

Reduced size of final equipment;


型号：	WF20M472_ZTL
厂家：	Walsin Technology
描述：	Reduced size of final equipment
文件：	总7页 (文件大小：213K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

WF20M / WF12M / WF08M / WF06M

0/-20% and 0/-30%

Trimmable chip resistors

Size 2010, 1206, 0805, 0603

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WFxxM Trimmable_V11

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FEATURE

1. Reduced size of final equipment

2. Lower assembly costs

3. Higher component and equipment reliability

4. Improved performance at high frequency

5. Low noise, when not trimmed

6. RoHS compliant and Lead free products

APPLICATION

•

Consumer electrical equipment

Automotive application

EDP, Computer application

Telecom application

DESCRIPTION

The resistors are constructed on a high-grade ceramic body (aluminum oxide). Internal metal electrodes are

added at each and connected by a resistive paste, which is applied to the substrate. The composition of the

paste is adjusted to give the approximate resistance required.

The resistive layer is converted with a transparent protective coating. Finally the two external end terminations

are added. For case of soldering the outer of theses end terminations is Tin (lead free) alloy.

Fig 1. Consctruction of Trimmable Chip-R

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QUICK REFERENCE DATA

Item

General Specification

Series No.

WF20M

WF12M

WF08M

WF06M

Size code

2010 (5020)

1206 (3216)

0805 (2012)

0603 (1608)

Resistance Range

1Ω ~ 10MΩ Tolerance 0/-10% and 0/-20% and 0/-30% (E24 series)

TCR (ppm/°C)

≥10Ω

≤ ± 200 ppm/°C

<10Ω

-300~+500 ppm/°C

Max. dissipation at T_amb=70°C

Max. Operation Voltage (DC or RMS)

Max. Over Load Voltage (DC or RMS)

Climatic category (IEC 60068)

1/2W

200V

400V

1/4 W

200V

400V

1/8W

100V

200V

1/10W

50V

100V

55/155/56

Note :

This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication

60115-8”

Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by

RCWV = RatedPower ×Resistance Value or Max. RCWV listed above, whichever is lower.

DIMENSIONS(unit : mm)

WF20M

WF12M

5.00 ± 0.20

2.50 ± 0.20

0.55 ± 0.15

0.65 ± 0.25

0.60 ± 0.25

3.10 ± 0.10

1.60 ± 0.10

0.60 ± 0.15

0.45 ± 0.20

0.50 ± 0.20

WF08M

WF06M

2.00 ± 0.10

1.25 ± 0.10

0.50 ± 0.15

0.40 ± 0.20

1.60 ± 0.10

0.80 ± 0.10

0.45 ± 0.15

0.30 ± 0.20

0.30 ± 0.10

MARKING

No marking for Trimmable Chip Resistor

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TRIMMING INTRODUCTIONS

Typical value for a YAG-laser;

cutting speed

laser power

bite size

: 10-200 mm/sec,

: 1-6 Watt,

: 3~10µm ( = speed / Q_rate , Bite Size is the distance each laser spot moving and

influence the trimming accuracy)

maximum trimming length : 60% of resistive film width, minimum distance from end termination to trimming

cut : 0.20mm, minimum distance between cuts (double-cut) : 0.5mm

Protection of the laser cut

by epoxy-fenol lacquers, epoxy resins or silicon alkyd-resins.

This is necessary for humidity test and stability under loaded.

FUNCTIONAL DESCRIPTION

Product characterization

Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of ±5%,

and E96 series for resistors with a tolerance of ±1%. The values of the E24/E96 series are in accordance with

“IEC publication 60063”

Derating

The power that the resistor can dissipate depends on the operating temperature; see Fig.2

Figure 2 Maximum dissipation in percentage of rated power

as a function of the ambient temperature

MOUNTING

Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by

automatic placement systems.

Chip placement can be on ceramic substrates and printed-circuit boards (PCBs).

Electrical connection to the circuit is by individual soldering condition.

The end terminations guarantee a reliable contact.

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SOLDERING CONDITION

The robust construction of chip resistors

allows them to be completely immersed in a

solder bath of 260°C for 10 seconds.

Therefore, it is possible to mount Surface

Mount Resistors on one side of a PCB and

other discrete components on the reverse

(mixed PCBs).

Surface Mount Resistors are tested for

solderability at 235°C during 2 seconds. The

test condition for no leaching is 260°C for 30

seconds. Typical examples of soldering

processes that provide reliable joints without

any damage are given in Fig 3.

Fig 3. Infrared soldering profile for Chip Resistors

CATALOGUE NUMBERS

The resistors have a catalogue number starting with :

WF12

472_

Size code

Type code

Resistance code

Tolerance

Packaging code

Termination code

WF20

WF12

WF08

WF06

: 2010 M : Trimmable

E24 :

significant digits X : 0/-30%

: 7” Reeled taping

: Bulk

= Sn base (lead

free)

followed by no. of

zeros and a blank

: 1206

: 0805

: 0603

Y : 0/-20%

Z : 0/-10%

4.7Ω

10Ω

=4R7_

=100_

=221_

220Ω

(“_” means a blank)

Reeled tape packaging : WF12M / WF08M / WF06M - 8mm width paper taping 5000pcs per reel.

: WF20M – 12mm width paper taping 4000pcs per reel.

Bulk packaging

: WF12M / WF08M / WF06M - 5000pcs per polybag

: WF20M – 4000pcs per polybag

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TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)

TEST

DC resistance

Clause 4.5

PROCEDURE

REQUIREMENT

DC resistance values measured at the test voltages specified below :

<10Ω@0.1V, <100Ω@0.3V, <1KΩ@1.0V, <10KΩ@3V,

Within the specified tolerance

<100KΩ@10V, <1MΩ@25V,

<10MΩ@30V

Temperature

Natural resistance change per change in degree centigrade.

Refer to

Coefficient of

Resistance(T.C.R)

“QUICK REFERENCE DATA”

R₂− R

×10⁶

(

t₂− t₁

)

Clause 4.8

(ppm/°C)

; t1 : 20°C+5°C-1°C

R1 : Resistance at reference temperature

R2 : Resistance at test temperature

∆R/R max. ±(2.0%+0.10Ω)

Short time overload

(S.T.O.L)

Permanent resistance change after a 5second application of a voltage

2.5 times RCWV or the maximum overload voltage specified in the

above list, whichever is less.

Clause 4.13

Resistance to soldering

heat(R.S.H)

Un-mounted chips completely immersed for 10±1second in a SAC

solder bath at 260℃±5ºC

no visible damage

∆R/R max. ±(1.0%+0.05Ω)

Clause 4.18

Un-mounted chips completely immersed for 2±0.5 second in a SAC good tinning (>95% covered)

Solderability

solder bath at 235℃±5℃

no visible damage

Clause 4.17

Temperature cycling

Clause 4.19

30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes no visible damage

at +155°C±3°C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous

∆R/R max. ±(0.5%+0.05Ω)

cycles

∆R/R max. ±(3.0%+0.1Ω)

Load life (endurance)

Clause 4.25

1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller

70±2ºC, 1.5 hours on and 0.5 hours off

∆R/R max. ±(3.0%+0.1Ω)

Load life in Humidity

Clause 4.24

1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber

controller at 40°C±2°C and 90~95% relative humidity, 1.5hours on and

0.5 hours off

Bending strength

Clause 4.33

Adhesion

Resistors mounted on a 90mm glass epoxy resin PCB(FR4); bending : no visible damage

3 mm, once for 10 seconds. (only 2010: 2mm)

∆R/R max. ±(1%+0.05Ω)

Pressurizing force: 5N, Test time: 10±1sec.

No remarkable damage or

removal of the terminations.

Clause 4.32

Insulation Resistance

R≧10GΩ

Apply the maximum overload voltage (DC) for 1minute

Apply the maximum overload voltage (AC) for 1 minute

Clause 4.6

Dielectric Withstand

No breakdown or flashover

Voltage

Clause 4.7

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PACKAGING

Paper Tape specifications (unit :mm)

Series No.

WF20M

WF12M

WF08M

WF06M

5.50±0.20

3.60±0.20

2.40±0.20

1.90±0.20

2.80±0.20

2.00±0.20

1.65±0.20

1.10±0.20

12.00±0.30

5.50±0.1

1.75±0.10

8.00±0.30

3.50±0.20

1.75±0.10

Series No.

WF20M

ΦD

Max. 1.2

Max. 1.0

0.65±0.05

+0.1

4.00±0.10

WF12M / WF08M

WF06M

Φ1.50

−0.0

Reel dimensions

Symbol (unit : mm)

WF12M / WF08M / WF06

WF20M

13.0±0.2

9.0±0.5

Φ178.0±2.0

Φ60.0±1.0

14.0±0.2

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