WF04R4R70CTLS datasheet(8/11 Pages) WALSIN

8 / 11 page

Approval Sheet

Page 8 of 11

ASC_WFxxS V01

Aug - 2018

TEST AND REQUIREMENTS

REQUIREMENT

TEST

PROCEDURE

Resistor

DC resistance

IEC60115-1 4.5.1

DC resistance values measured

Within the specified tolerance

Temperature

Coefficient of

Resistance(T.C.R)

IEC 60115-1 4.8.4.1

Natural resistance change per change in degree

centigrade.

(

)

−

(ppm/

°C)

R1 : Resistance at reference temperature

R2 : Resistance at test temperature

t1 : 20°C+5°C-1°C

t2 : 125°C+5°C-1°C

Refer to

“ QUICK REFERENCE DATA “

Short time overload

(S.T.O.L)

IEC60115-1 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.

Measure test conclusion after 30mins

∆R/R max. ±(0.5%+0.05Ω)

Resistance to soldering

heat(R.S.H)

IEC 60115-1 4.18

Un-mounted

chips

completely

immersed

for

10±1second in a SAC solder bath at 260℃±5ºC

no visible damage

∆ R/R max. ±(0.2%+0.05Ω)

Solderability

IEC 60115-1 4.17

1.Un-mounted chips completely immersed for 5

seconds in a SAC solder bath at 245℃±5℃

good tinning (>95% covered)

no visible damage

Temperature cycling

IEC 60115-1 4.19

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

∆R/R max. ±(0.5%+0.05Ω)

Load life (endurance)

IEC 60115-1 4.25.1

70±2ºC,

1000

hours,

loaded

with

RCWV

Vmax,1.5 hours on and 0.5 hours off

∆R/R max. ±(0.5%+0.05Ω)

Load life in Humidity

IEC 60115-1 4.24.2

1000 hours, at rated continuous working voltage in

humidity

chamber

controller

°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

IEC 60115-1 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)

Adhesion

IEC 60115-1 4.32

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

No remarkable damage or removal of

the terminations.

Insulation Resistance

Clause 4.6

Apply the maximum overload voltage (DC) for

1minute

R≧10GΩ

Dielectric Withstand

Voltage

Clause 4.7

Apply the maximum overload voltage (AC) for 1

minute

No breakdown or flashover

Flower of Sulfur

ASTM-B-809-95

Sulfur 480 hours, 60°C, unpowered

∆R/R max. ±(1%+0.05Ω)

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