Ultra Precision

Metal Film Resistors

MAR 40/42 series

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Load at rated power: 1000 hrs at 85°C

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Dry heat: 1000 hrs at 155°c

∆

5

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1.0

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Shelf life: 12 months at room temperature

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Damp heat (IEC 68-2-3)

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Thermal shock (tested per method 107, MIL-STD 202 condition F)

∆

1

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Effect of solder (tested per method 210, MIL-STD 202)

∆

300

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Vibration and bump

∆

200

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Ultra Precision

Metal Film Resistors

MAR 40/42 series

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

181

Issue B · 03.02

Welwyn Components

Performance Data

Matched Sets and Networks

Welwyn has many years experience in the supply of matched

sets of precision resistors.

Resistors in a set can be supplied matched for tolerance and

TCR down to 0.005% and 1ppm/°C of each other.

Packaging

The standard packaging is loose in boxes of 50 or 300

resistors.

Ordering Procedure

Example: MAR40 with TCR of 5ppm/°C at 68.1 kilohms and 0.005% tolerance in a box of 50

pieces -

M A R 4 0 V – 6 8 K 1 E I

Type

H

2 ppm/

°C

V

5 ppm/

°C

Value (use IEC62 code)

Tolerance (use IEC62 code)

E

0.005%

B

0.1%

L

0.01%

C

0.25%

P

0.02%

D

0.5%

W 0.05%

F

1%

Packing

I

Bulk

MAR40, MAR42

50/box

Standard

Make Possible

07.14

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

www.ttelectronicsresistors.com