Dimensions (mm) and weight (g)

Type

L

D

K

Weight

max

max

max

min

WRM 0102

2.2

1.1

1.1

0.35

0.01

WRM 0204

3.

6

1.4

1.4

0.5

0.02

WRM 0207

6.

0

2.

2

2.2

1.1

0.08

Mini Melf

Resistors

WRM Series

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

WRM 0102

WRM 0204

WRM 0207

Power rating at 70°C

watts

0.2

0.25

0.4

Resistance range

ohms

R22 – 2M21

R22 – 10M

R22 – 8M2

Limiting element voltage

volts

150

200

250

TCR

ppm/°C

15, 25, 50

5, 15, 25, 50

25, 50

Resistance tolerance

%

0.1, 0.25, 0.5, 1.0, 2, 5

Standard values

E24 & E96

Thermal impedance

k/W

250

200

140

Ambient temperature range

°C

-55 to +125

Insulation resistance

ohms

Electrical Data

Physical Data

Issue D · 09.06

A subsidiary of

TT electronics plc

Welwyn Components

L

K

D

Construction

A metal film is deposited onto a high dissipation ceramic

former to which tin plated teminating caps are fitted.

The resistor is adjusted to value by a helical cut in the film

and the body is protected by a lacquer coating.

Marking

Resistance values are colour coded with 4 or 5 bands

depending on type.

Terminations

Material

Plated steel cap.

Solderability

The pure tin finish produces ageing free

contacts on which low melting solders can

be used. Dipped area shall be covered with

a smooth and bright solder coating after

3 seconds immersion at 215°C.

Solvent Resistance

The body protection and marking are resistant to all normal

industrial cleaning solvents suitable for printed circuit boards.