MELF

Resistors

WRM Series

www.bitechnologies.com www.irctt.com www.welwyn-tt.com

General Note

TT electronics reserves the right to make changes in product specification without notice or liability.

All information is subject to TT electronics’ own data and is considered accurate at time of going to print.

© TT electronics plc

09.13

MELF

Resistors

WRM Series

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

01.11

Welwyn Components

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

Performance Data

Test

Results

∆ R/R ±

0204 & 0207: 10R - <75R

& >100K - 332K

0102: 4R7 - 110K, 0204 &

0207: R22 - <10R & >332K - 10M

0204 & 0207: 75R - 100K

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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No flashover or breakdown

±25ppm

–

–

10R – 680K

TCR and Tolerance Range

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

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Reference

5%

2%

1.0%

0.5%

0.25%

0.1%

±50ppm

4R7 - 110K

–

–

–

–

–

WRM0102

––––

–

±50ppm

–

–

1R – 5M1

10R – 1M6

22R – 332K

43R – 332K

±100ppm

R22 – R91

WRM0204

±25ppm

–

–

4R7 - 500K

10R – 500K

22R – 402K

43R – 332K

±15ppm

–

–

–

10R – 221K

22R – 221K

43R – 221K

±10ppm

–

––

–

22R – 221K

43R – 221K

±05ppm

–

––

–

100R – 100K

100R – 100K

1R-10M

R22 – R91

–

±100ppm

WRM0207

±15ppm

–

––

––

––

10R - 1M

51R1 - 330K

100R - 100K

100R - 10K

51R1 - 10K

51R1 - 10K