Precision Metal

Film Resistors

PR series

Dimensions (mm) & Weight (g)

PCB

Min.

mounting

bend

Type

L Max

D Max

f min

d nom

centres

radius

Wt.nom

PR4

6.2

2.5

21

0.6

10.2

0.6

0.3

PR5

9.0

3.6

19.6

0.8

12.7

1.2

0.5

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

PR4

PR5

Power rating at 70°C

watts

0.25

0.5

Resistance range

ohms

100R – 240K

100R – 1M

Limiting element voltage

volts

250

350

TCR*

ppm/°C

25

25

Resistance tolerance

%

0.1, 0.25, 0.5, 1

0.1, 0.25, 0.5, 1

Standard values

E192

E192

Thermal impedance

°C/watt

140

112

Ambient temperature range

°C

-55 to 155

Electrical Data

Physical Data

Issue C · 04.03

A subsidiary of

TT electronics plc

Welwyn Components

182

L

D

f

d

*15ppm/°C available by request

Construction

The resistance element is a precisely controlled thin film of

metal alloy sputtered on to a high purity ceramic core,

protected by a moisture-resistant, high dielectric strength

coating applied so that terminations remain completely clear.

This permits a well defined body length (clean lead to clean

lead dimension L).

Terminations

Material

Solder-coated copper wire.

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

Resistors are colour coded with 5 bands. IEC 62 colours are

used.

Solvent Resistance

The body protection and marking are resistant to all normal

industrial cleaning solvents suitable for printed circuits.

PR_C.qxd

1/5/03

8:58 am

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