MH25

MH37

Power rating at 70°C max

watts

0.25

0.5

Resistance range

ohms

100K - 10M

100K - 3M

Limiting element voltage

volts dc or ac peak

1,600

3,500

Isolation voltage

volts

700

TCR

ppm/°C

100

Resistance tolerance

%

1, 2, 5

Standard values

E24 and E96 preferred

Thermal impedance

°C/watt

140

112

Ambient temperature range

°C

- 55 to 155

General Note

Welwyn Components reserves the right to make changes in product specification without notice or liability.

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

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

Electrical Data

Issue E · 10.05

A subsidiary of

TT electronics plc

Welwyn Components

191

Construction

Thin film material is sputtered on to high grade ceramic rods.

Nickel plated steel caps are force fitted and the termination

wires are welded to the caps. The value is obtained by a

helical cut in the film and finally the resistor body is protected

by a cement protection applied so that the terminations

remain completely clear.

Marking

1% tolerance resistors are colour coded with 5 bands.

2% and 5% tolerance have 4. Band IEC 62 colours are used.

Terminations

Material

Solder-coated copper wire.

Strength

The terminations satisfy the requirements of

IEC 68.2.21.

Solderability

The terminations meet the requirements of

IEC 115-1, Clause 4.17.3.2

Solvent resistance

The body protection and marking are resistant to all normal

industrial cleaning fluids suitable for printed boards.

Dimensions (mm) and Weight (g)

PCB

Min

mounting

Bend

Type

L max

D max

f min

d nom

centres

Radius

Wt.nom

MH25

6.2

2.5

21.0

0.6

10.2

0.6

0.3

MH37

9.0

3.7

19.6

0.8

12.7

1.2

0.5

Physical Data

L

D

f

d

High Voltage

Metal Film Resistors

MH Series

in value range 680K to 3M