WF04T101DT - Walsin Technology Corp.

Walsin Technology Corporation

Page 1 of 9 WFxxT Version 04 Apr.-2007

WF12T, WF08T, WF06T, WF04T

±0.5%, 0.25%, ±0.1%

TC50

High Precision Thin Film chip resistors

Size 1206, 0805, 0603, 0402

Walsin Technology Corporation

Page 2 of 9 WFxxT Version 04 Apr.-2007

FEATURE

1. SMD metal film resistor

2. High reliability and stability of 0.1% and below per customer request

3. High performance of TCR: 50 ppm/K and below per customer request

4. Low current noise

APPLICATION

• Medical equipment

• Measuring instrument

• Communication device

• Computer

• Printer

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 layer that is applied to the top surface of the substrate. The

composition of the resistive layer 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

environmental soldering issue, the outer layer of these end terminations is a Lead-free solder .

Fig 1. Consctruction of Chip-R WFxxU

Walsin Technology Corporation

Page 3 of 9 WFxxT Version 04 Apr.-2007

QUICK REFERENCE DATA

Item General Specification

Series No. WF12T WF08T WF06T WF04T

Size code 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 ) 0402 ( 1005 )

Resistance Tolerance ±0.5%, ±0.25%, ±0.1%

Resistance Range 4.7Ω ~ 1MΩ

( E24 +E96 ) 4.7Ω ~ 1MΩ

( E24 +E96 ) 10Ω ~ 330KΩ

( E24 +E96 ) 10Ω ~ 100KΩ

( E24 +E96 )

TCR (ppm/°C) +50 ~ -50 ppm/°C

Max. dissipation at Tamb=70°C 1/8W 1/10W 1/16W 1/16W

Max. Operation Voltage (DC or RMS) 150V 100V 50V 25V

Climatic category (IEC 60068) 55/125/56

Note :

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

60115-8”

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

ValueResistancePower RatedRCWV ×= or Max. RCWV listed above, whichever is lower.

Dimensions:

Type WF12U WF08U WF06U WF04U

L 3.10 ± 0.10 2.00 ± 0.10 1.60 ± 0.10 1.00 ± 0.05

W 1.60 ± 0.10 1.25 ± 0.10 0.80 ± 0.10 0.50 ± 0.05

A 0.45 ± 0.20 0.25 ± 0.20 0.25 ± 0.15 0.20 ± 0.10

B 0.45 ± 0.20 0.40 ± 0.20 0.30 ± 0.15 0.25 ± 0.10

t 0.60 ± 0.15 0.50 ± 0.15 0.45 ± 0.15 0.35 ± 0.05

Protective coat

Resistive layer

End termination

Ceramic Substrate

1001

Walsin Technology Corporation

Page 4 of 9 WFxxT Version 04 Apr.-2007

Marking

Each resistor is marked with a three digits code on the protective coating to designate the

nominal resistance value. WF04T has no marking!

Example: E24 serious 1% 39R0 => 390 820R =>821

E96 serious 1% 17R8 =>25X， 178R => 25A

FUNCTIONAL DESCRIPTION

Product characterization

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

±0.5%, ±0.25%, ±0.1%. 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, Su rface 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.

SOLDERING CONDITION

The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260°C for

one minute. 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 within lead-free solder bath. The

test condition for no leaching is 260°C for 60 seconds. Typical examples of soldering processes that provide

reliable joints without any damage are given in Fig 3.

Walsin Technology Corporation

Page 5 of 9 WFxxT Version 04 Apr.-2007

Catalogue numbers

The resistors have a catalogue number starting with .

WF06 T xxx D T

Size code

WF12: 1206

WF08: 0805

WF06: 0603

WF04: 0402

Type code

T: TCR 50ppm

Resistance code

E96 +E24:

R is first code followed by

3 significant digits.

E24: 39R0=>390

820R =>821

E96: 17R8 =>25X

178R =>25A

Tolerance

D : ±0.5%

C: ±0.25%

B : ±0.1%

Packaging code

T : Reeled

1. Reeled tape packaging: 8mm width paper taping.

5,000pcs/reel for WF12T, WF08T, WF06T;

10,000pcs/reel for WF04T.

Walsin Technology Corporation

Page 6 of 9 WFxxT Version 04 Apr.-2007

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

REQUIREMENT

TEST PROCEDURE Resistor

DC resistance

Clause 4.5 DC resistance values measured

<10Ω@0.1V, <100Ω@0.3V, <1KΩ@1.0V,

<10KΩ@3V, <100KΩ@10V,<1MΩ@25V,

<10MΩ@30V

Within the specified tolerance ±0.5%, ±0.25%,

±0.1%

Temperature

Coefficient of

Resistance(T.C.R

)

Clause 4.8

Natural resistance change per change in degree

centigrade.

()

121

12 10×

−

ttR RR (ppm/°C)

R1 : Resistance at reference temperature

R2 : Resistance at test temperature

t1 : 20°C+5°C-1°C

Test temperature –55°C ~ +125°C

TCR: ≦±50 ppm/°C

Short time

overload

(S.T.O.L)

Clause 4.13

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.

∆R/R max. ±(0.2%+0.05Ω)

Resistance to

soldering

heat(R.S.H)

Clause 4.18

Un-mounted chips completely immersed for

10±1second in a solder bath at 270℃±5ºC no visible damage

∆ R/R max. ±(0.1%+0.05Ω)

Solderability

Clause 4.17 Un-mounted chips completely immersed for

2±0.5second in a solder bath at 235℃±5℃ good tinning (>95% covered)

no visible damage

Leach Test

Clause 4.18 Un-mounted chips completely immersed for 60±

1second in a solder bath at 260℃±5℃ Ditto

Temperature

cycling

Clause 4.19

30 minutes at -55°C±3°C, 2~3 minutes at

20°C+5°C-1°C, 30 minutes at +125°C±3°C,

2~3 minutes at 20°C+5°C-1°C, total 5

continuous cycles

no visible damage

∆R/R max. ±(0.1%+0.05Ω)

Load life

(endurance)

Clause 4.25

70±2ºC, 1000 hours, loaded with RCWV or

Vmax,1.5 hours on and 0.5 hours off ∆R/R max. ±(0.5%+0.05Ω)

Load life in

Humidity

Clause 4.24

1000 hours, at rated continuous working voltage

in humidity chamber controller at 40°C±2°C and

90~95% relative humidity, 1.5hours on and 0.5

hours off

∆R/R max. ±(0.5%+0.05Ω)

Bending strength

Clause 4.33 Resistors mounted on a 90mm glass epoxy resin

PCB(FR4); bending : 3 mm, once for 10 seconds. ∆R/R max. ±(0.1%+0.05Ω)

Adhision

Clause 4.32 Pressurizing force: 5N, Test time: 10±1sec. No remarkable damage or removal of the

terminations.

Walsin Technology Corporation

Page 7 of 9 WFxxT Version 04 Apr.-2007

PACKAGING

Paper Tape specifications (unit :mm)

FP0

Series No. A B W D E

WF12 3.60±0.20 2.00±0.20 8.00±0.30 3.50±0.20 1.75±0.10

WF08 2.40±0.20 1.65±0.20 8.00±0.30 3.50±0.20 1.75±0.10

WF06 1.90±0.20 1.10±0.20 8.00±0.30 3.50±0.20 1.75±0.10

WF04 1.20±0.10 0.7±0.10 8.00±0.20 3.50±0.05 1.75±0.10

Series No. F P0 ΦD T

WF12 4.00±0.10 4.00±0.10 1.0 0.0

50.1 +

−

Φ Max. 1.0

WF08 4.00±0.10 4.00±0.10 1.0 0.0

50.1 +

−

Φ Max. 1.0

WF06 4.00±0.10 4.00±0.10 1.0 0.0

50.1 +

−

Φ 0.65±0.05

WF04 2.00±0.10 4.00±0.10 1.0 0.0

50.1 +

−

Φ 0.40±0.05

Reel dimensions

Symbol A B C D

(unit : mm) Φ178.0±2.0 Φ60.0±1.0 13.0±0.2 9.0±0.5

Walsin Technology Corporation

Page 8 of 9 WFxxT Version 04 Apr.-2007

Taping quantity

- Chip resistors 5,000 pcs per reel ( WF12T, WF08T, WF06T )

- Chip resistors 10,000 pcs per reel ( WF04T )