Power Metal Oxide

Film Resistors

MO-S Series

pulse handling applications

MO1S

MO2S

MO3S

MO5S

Power rating at 70°C

watts

0.5

1.0

2.0

3.0

5.0

Restance range

ohms

10R - 50K

10R - 100K

10R - 100K

Limiting element voltage

volts

250

350

500

TCR

ppm/°C

350

Isolation voltage

volts

350

500

700

Resistance tolerance

%

5, 10

Standard values

E24 preferred

Thermal impedance

°C/watt

140

110

80

60

35

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 C · 07.04

A subsidiary of

TT electronics plc

Welwyn Components

149

Construction

The tin oxide resistance element is deposited onto a high

purity ceramic rod. End caps are force fitted and termination

wires are welded to the end caps. The element is adjusted to

the required resistance value by a helical cut; finally a cement

protection is applied to the resistor body prior to marking

with indelible ink.

Terminations

Material

Resistor sizes up to and including the MO3S

use solder coated copper terminations. MO4S

and MO5S use solder coated steel cored

terminations.

Strength

The terminations meet the requirements of

IEC 68.2.21.

Solderability The terminations meet the requirements of

IEC 115-1, Clause 4.17.3.2.

Marking

with four bands. IEC 62 colours are used. For larger sizes type

reference, resistance value and tolerance are legend marked.

The resistance value marking conforms to lEC 62.

Solvent Resistance

The body protection and marking are resistant to all normal

industrial cleaning solvents suitable for printed circuits.

Flammability

The resistor coating will not burn or emit incandescent

particles under any condition of applied temperature or

power overload.

Dimensions (mm) and Weight (g)

pcb

Min

mounting

bend

Wt.

Type

L max.

D max.

f min.

d nom.

centres

radius

nom.

6.2

2.5

21.0

0.6

10.0

0.6

0.3

MO1S

9.0

3.6

19.6

0.8

12.5

1.2

0.5

MO2S

12.5

4.2

17.8

0.8

15.0

1.2

0.9

MO3S

14.5

5.3

23.8

0.8

20.0

1.2

1.1

MO5S

25.0

8.5

27.6

0.8

30.0

1.2

4.3

Physical Data

L

D

f

d

OBSOLETE