High Value Thick Film

Resistors

GC Series

GC55

GC65

GC70

Power rating at 70°C

watts

0.25

0.5

1.0

Resistance range

ohms

47k to 900 meg

47k to 900 meg

47k to 1G

Limiting element voltage

Volts dc or ac Peak

1700

3500

10000

Isolation voltage

volts

700

TCR (20°C to 70°C)

ppm/°C

100

Resistance tolerance

%

1, 2, 5

Values

E24 & E96 preferred

Thermal impedance

°C/watt

140

90

70

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 B · 03.02

A subsidiary of

TT electronics plc

Welwyn Components

199

Construction

Thick film material is fired 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 given a

high temperature protective coating.

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.

Marking

1% tolerance resistors are colour coded with 5 bands, 2%

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

Solvent Resistance

The body protection and marking are resistant to all normal

industrial cleaning fluids suitable for printed circuit boards.

Dimensions (mm) and Weight (g)

PCB

Min

mounting

bend

Wt

Type

L max.

D max.

f min.

d nom.

centres

radius

nom.

GC55

6.2

2.5

21.0

0.6

10.2

0.6

0.3

GC65

9.0

3.6

19.6

0.8

13.7

1.2

0.6

GC70

14.5

5.3

23.6

0.8

20.3

1.2

1.1

Physical Data

L

D

f

d