WF08N1004FTL [WALSIN]

Special materials and design for higher working voltage required;


型号：	WF08N1004FTL
厂家：	Walsin Technology
描述：	Special materials and design for higher working voltage required
文件：	总9页 (文件大小：524K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

WF25N, WF20N, WF12N, WF08N, WF06N

1%, 5%

Thick Film High Voltage Chip Resistors

UL Safety Certification

Size 2512,2010,1206, 0805, 0603

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FEATURE

1. Special materials and design for higher working voltage required.

2. Compatible with flow and reflow soldering.

3. Suitable for lead free soldering.

4. Max. Voltage coefficient resistance below 300ppm.

5. RoHS compliant & Halogen Free.

6. Safety resistor certificate meet：

UL/IEC 60950-1 2.5 kV impulse.

UL/IEC 60065 10 kV impulse.

APPLICATION



Power supply

Measurement instrument

Back light inverter



Medical or Military equipment

DESCRIPTION

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

added at each end and connected by a resistive paste that is applied to the top surface of the substrate. The

composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to

nominated value within tolerance which controlled by laser trimming of this resistive layer.

The resistive layer is covered with a protective coat. Finally, the two external end terminations are added. For

ease of soldering the outer layer of these end terminations is a Tin (lead free) alloy.

Fig 1. Construction of Chip-R

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QUICK REFERENCE DATA

WF06N

WF08N

WF12N

WF20N

WF25N

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.

MECHANICAL DATA

WF25N

WF 20N

WF12N

WF08N

WF06N

Symbol

6.40 

0.20

5.00 

0.20

3.10 

0.10

2.00 

0.10

1.60 

0.10

3.20 

2.50 

1.60 

1.25 

0.80 

0.20

0.10

0.60 

0.15

0.60 

0.10

0.55 

0.10

0.50 

0.10

0.45 

0.10

0.65 

0.50 

0.40 

0.30 

0.25

0.20

105

0.90 

0.25

0.60 

0.25

0.50 

0.20

0.40 

0.20

0.30 

0.20

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MARKING

For E24 5% series, each resistor is marked with a three–digit code on the protective coating to designate

the nominal resistance value.

For E24/E96 1% series, each resistor is marked with a four–digit code on the protective coating to

designate the nominal resistance value. 0603 is marked with three-digits.

FUNCTIONAL DESCRIPTION

Product characterization

Standard values of nominal resistance are taken from the E24/E96 series for resistors with a tolerance of

1%, 5%. The values of the E24/E96 series are in accordance with “IEC publication 60063”.

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Derating curve

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

WF06N

WF08N

WF12N

WF20N

WF25N

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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

CATALOGUE NUMBERS

The resistors have a catalogue number starting with .

WF25

105

Size code

Type code

Resistance code

Tolerance

J : 5%

F : 1%

Packaging code

T : 7” inch reel

Termination

code

WF25 : 2512

WF20 : 2010

WF12 : 1206

WF08 : 0805

WF06 : 0603

N :High Voltage

UL certified

5% E24: 2 significant digits

followed by no. of zeros

and a blank

= Sn base

0603/0805/1206:

paper tape,

(lead free)

5kpcs/reel

1 M

= 105

2010,2512 :

plastic tape,

4kpcs/reel

1%, E24+E96: 3 significant

digits followed by no. of

zeros

1 M

= 1004

Tape packaging WF12, WF08, WF06 : 8mm width paper taping 5,000pcs per reel.

WF25；WF20: 12mm width plastic taping 4,000pcs per reel.

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

Essentially all tests are carried out according to the schedule of IEC publication 115-8, category

LCT/UCT/56(rated temperature range : Lower Category Temperature, Upper Category Temperature; damp

heat, long term, 56 days). The testing also meets the requirements specified by EIA, EIAJ and JIS.

The tests are carried out in accordance with IEC publication 68, “Recommended basic climatic and mechanical

robustness testing procedure for electronic components” and under standard atmospheric conditions according

to IEC 60068-1, subclause 5.3. Unless otherwise specified, the following value supplied :

Temperature: 15°C to 35°C.

Relative humidity: 45% to 75%.

Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar).

All soldering tests are performed with midly activated flux.

TEST

PROCEDURE

REQUIREMENT

Temperature Coefficient

of Resistance(T.C.R)

Natural resistance change per change in degree centigrade. Refer to

“QUICK REFERENCE DATA”

R₂ R

10⁶(ppm/C)

Clause 4.8

₁t₂t₁

R₁: Resistance at reference temperature

R₂: Resistance at test temperature

t₁: 20°C+5°C-1°C

Short time overload

(S.T.O.L)

Permanent resistance change after a 5 second application of No visible damage

5 times of rated power.

J: R/R max. (2%+0.1)

Clause 4.13

F: R/R max. (1%+0.1)

no visible damage

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

SAC solder bath at 260℃±5ºC

Resistance to soldering

heat(R.S.H)

R/R max. ±(1%+0.15)

Clause 4.18

Solderability

Clause 4.17

Un-mounted chips completely immersed for 3±0.5second in

a SAC solder bath at 245℃±5℃

good tinning (>95% covered)

no visible damage

Temperature cycling

30 minutes at -55C3C, 2~3 minutes at 20°C+5°C-1°C, 30

minutes at +155C3C, 2~3 minutes at 20°C+5°C-1°C, total

5 continuous cycles

no visible damage

Clause 4.19

R/R max. ±(1%+0.1)

Load life (endurance)

1000 +48/-0 hours, loaded with RCWV or Vmax in chamber no visible damage

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

Clause 4.25

J: R/R max. (3%+0.1)

F: R/R max. (1%+0.1)

1000 +48/-0 hours, loaded with RCWV or Vmax in humidity no visible damage

Load life in Humidity

chamber controller at 40C2C and 95% relative humidity,

Clause 4.24

J: R/R max. (3%+0.1)

F: R/R max. (1%+0.1)

R/R max. ±(0.5%+0.05)

1.5hours on and 0.5 hours off

Resistors mounted on a 90mm glass epoxy resin

PCB(FR4),

Bending strength

Clause 4.33

2512, 2010, 1206 bending : 2 mm once for 10 seconds

0805, 0603 bending: 3mm once for 10 seconds

Apply voltage 100+/-15V for 1minute

Insulation Resistance

R≧1GΩ

Clause 4.6

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PACKAGING

Paper Tape specifications (unit :mm)

Series No.

WF25N

6.70±0.20

3.50±0.20

12.00±0.30

5.50±0.10

1.75±0.10

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

WF20N

WF12N

WF08N

8.00±0.30

D

3.50±0.20

1.75±0.10

WF06N

Series No.

WF25N

Max. 1.2

WF20N

0.1

0.0

WF12N

4.00±0.10

1.50

Max. 1.0

WF08N

0.65±0.10

WF06N

Reel dimensions

(unit : mm)

Reel / Tape

7” reel for 12mm tape

12.4±1.0

13.0±0.2

178.0±2.0

60.0±1.0

7” reel for 8mm tape

9.0±0.5

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