Mini Melf

Resistors

WRM Series

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Issue D · 09.06

Welwyn Components

TCR and Tolerance Range

* TC 10ppm & 5ppm is specified over the temperature range -10°C to +85°C.

* Resistors to be mounted on a PC-board according to IEC 115-1, clause 4.27.1

Performance Data

e

c

n

a

r

e

l

o

T

R

C

T

e

p

y

T

Reference

5%

2%

1.0%

0.5%

0.25%

0.1%

WRM0102

±50ppm

R22 – R91

IRO – 9R1

10R – 2.21M

47RS – 221K

100R – 221K

–

WRM0102

±25ppm

–

–

10R – 221K

47R5 – 221K

100R – 221K

100R – 100K

WRM0102

±15ppm

–

–

–

100R – 100K

100R – 100K

100R – 100K

WRM0102

±10ppm

–

–

–

–

–

–

WRM0102

±05ppm

–

–

–

–

–

–

WRM0204

±50ppm

R22 – R91

–

1R – 10M

10R – 475K

22R – 332K

43R – 332K

WRM0204

±25ppm

–

–

10R – 475K

10R – 475K

22R – 332K

43R – 332K

WRM0204

±15ppm

–

–

–

10R – 221K

22R – 221K

43R – 221K

WRM0204

±10ppm

–

–

–

–

22R – 221K

43R – 221K

WRM0204

±05ppm

–

–

–

–

100R – 100K

100R – 100K

WRM0207

±50ppm

R22 – R91

–

1R – 8.2M

10R – 1M

–

–

WRM0207

±25ppm

–

–

–

10R – 1M

–

–

WRM0207

±15ppm

–

–

–

–

–

–

WRM0207

±10ppm

–

–

–

–

–

–

WRM0207

±05ppm

–

–

–

–

–

–

Test

Results

R/R ±

Stability class

0

.

1

5

.

0

5

2

.

0

n

o

it

p

ir

c

s

e

D

10 Ω – <75 Ω

0.22 Ω – <10 Ω

75 Ω – <100 kΩ

>100 kΩ – 332 kΩ

>332 kΩ – 10 MΩ

Short time overload*

≤ 0.05% + 0.01 Ω

≤ 0.1% + 0.01 Ω

≤ 0.25% + 0.05 Ω

Bending test*

≤ 0.05% + 0.01 Ω

≤ 0.1% + 0.01 Ω

≤ 0.25% + 0.05 Ω

Resistance to soldering heat

≤ 0.05% + 0.01 Ω

≤ 0.1% + 0.01 Ω

≤ 0.25% + 0.05 Ω

Temperature rapid change

≤ 0.05% + 0.01 Ω

≤ 0.1% + 0.01 Ω

≤ 0.25% + 0.05 Ω

Endurance*

Load life

1000h

≤ 0.25% + 0.05 Ω

≤ 0.25% + 0.05 Ω

≤ 0.5% + 0.05 Ω

8000 h

≤ 0.5% + 0.05 Ω

≤ 0.5% + 0.05 Ω

≤ 1.0% + 0.05 Ω

Climatic sequence*

≤ 0.25% + 0.05 Ω

≤ 0.5% + 0.05 Ω

≤ 1.0% + 0.05 Ω

Damp heat steady state*

≤ 0.25% + 0.05 Ω

≤ 0.5% + 0.05 Ω

≤ 1.0% + 0.05 Ω

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and bright solder coating of at least 96%

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200V

300V

500V