Dimensions (mm) and Weight (g)

PCB

Min

mounting

bend

Wt

Type

L max.

D max.

f min.

d nom.

centres

radius

nom.

WA82

6.2

2.8

21.20

0.6

10.20

0.6

0.22

WA83

9.0

3.6

19.80

0.8

12.70

1.2

0.50

WA835

12.5

4.5

17.80

0.8

18.40

1.2

0.50

WA84

14.5

5.2

24.55

0.8

20.30

1.2

1.10

WA85

16.5

7.0

23.55

0.8

22.86

1.2

1.75

WA87

25.0

8.8

28.30

0.8

31.40

1.2

4.40

General Purpose Cement

Coated Wirewound Resistors

WA80 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

89

WA82

WA83

WA835

WA84

WA85

WA87

Power rating at 25°c

watts

1

2.0

2.5

3.0

5

7

Power rating at 70°c

watts

.86

1.6

2.0

2.5

4.3

6

Resistance range

ohms

0R068 to 430

0R05 to 900R

0R05 to 900R

0R01 to 2K2

0R015 to 6K8

0R15 to 10K

Limiting element voltage

volts

50

50

75

100

150

150

Isolation voltage

volts

250

250

250

350

500

700

TCR

ppm/°C

<1

Ω:350

>1

Ω:200

Resistance tolerance

%

<20R: 5, 10

≥20R: 1, 2, 5, 10

Values

E24 preferred

Thermal impedance

°C/watt

140

110

82

90

54

35

Ambient temperature range

°C

- 55 to 155

Electrical Data

Physical Data

Issue D · 08.04

A subsidiary of

TT electronics plc

Welwyn Components

L

D

f

d

Construction

A high quality ceramic substrate is assembled with

interference fit end caps to which are welded the termination

wires. The resistive element is wound on the substrate and

welded to the caps. Cement protection is applied to the

resistor body before marking with indelible ink.

Terminations

Material

Solder-coated copper wire on 82, 83, 835, 84,

and 85, solder coated cooper clad steel on 87.

Strength

The terminations meet requirements of

IEC 68.2.21.

Solderability The terminations meet the requirements of IEC

115-1, Clause 4.17.3.2.

WA80_D.qxd

8/6/04

10:58 AM

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