Approval sheet

Page 5 of 7

ASC_WF10H_V01

Jan.2010

CATALOGUE NUMBERS

The resistors have a catalogue number starting with .

WF10

H

4702

D

T

L

Size code

WF10: 1210

Type code

H : High precision,

<1%, TCR>50ppm

Resistance code

E96 +E24:

3 significant digits followed

by no. of zeros

102

Ω

=1020

37.4K

Ω

=3742

220

Ω

=2200

Tolerance

D :

±±±± 0.5%

B :

±±±± 0.1%

Packaging code

T: 7” Reeled taping

Termination code

L = Sn base

(lead free)

Reeled tape packaging : 8mm width paper taping 5000pcs per 7” reel.

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

Basic specification : JIS C 5202 / IEC 60115-1

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 68-1, subclause 5.3, unless otherwise specified.

Temperature: 15ºC to 35ºC.

Relative humidity: 45% to 75%.

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

TEST

PROCEDURE

REQUIREMENT

Temperature

Coefficient of

Resistance(T.C.R)

Clause 4.8

Natural resistance change per change in degree centigrade.

(

)

6

1

2

1

1

2

10

×

−

−

t

t

R

R

R

(ppm/

Refer to “QUICK REFERENCE

DATA”

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. ±(2%+0.1Ω)

Resistance to

soldering

heat(R.S.H)

Clause 4.18

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

SAC solder bath at 260℃±5ºC

no visible damage

∆ R/R max. ±(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

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 +155

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

5 continuous cycles

no visible damage

∆R/R max. ±(1%+0.05Ω)