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· CECC approved

? CECC approved

? Impervious lead free vitreous enamel coating

? Overload characteristics ideal for protection circuits

Vitreous Enamelled

Wirewound Resistors

W20 Series

Suitable for harsh environments

Impervious lead free vitreous enamel coating

· High and reliability

? Overload stability characteristics ideal

for power circuits

· High protection dissipation for size

? High stability and reliability

Welwyn Components

High power dissipation for size

Electrical Data

C o m m e r c i a l

W 2 1

W 2 1 5

W 2 2

W 2 3

W 2 4

P o w e r r a t i n g a t 2 5 ° C

w a t t s

3 . 0

5 . 0

7 . 0

1 0 . 5

1 4 . 0

R e s i s t a n c e r a n g e a t

1 % t o l e r a n c e

2 % t o l e r a n c e

o h m s

1 R t o 1 0 K

0 R 5 t o 1 0 K

1 R t o 1 5 K

0 R 5 t o 1 5 K

1 R t o 2 2 K

0 R 5 t o 2 2 K

1 R t o 6 0 K

1 R t o 1 0 0 K

T C R ( - 5 5 ° t o 2 0 0 ° C )

5 % t o l e r a n c e

o h m s

p p m/ ° C

0 R 1 t o 1 0 K

0 R 1 t o 1 5 K

T y p i c a l l y : < + -75

0 R 1 t o 2 2 K 0 R 1 5 t o 6 0 K 0 R 2 t o 1 0 0 K

Maximum: +-200

BS CECC 40-201-002 Requirements

P o w e r r a t i n g a t 2 5 ° C

P o w e r r a t i n g a t 7 0 ° C

Style

w a t t s

2 . 9

2 . 5

5 . 0

4 . 3

7 . 0

6 . 0

1 0 . 5

9 . 0

1 4 . 0

1 2 . 0

R e s i s t a n c e r a n g e a t

1 % t o l e r a n c e

2 % t o l e r a n c e

o h m s

1 R t o 1 0 K

0 R 5 t o 1 0 K

1 R t o 1 5 K

0 R 5 t o 1 5 K

1 R t o 2 0 K

0 R 5 t o 2 0 K

1 R t o 5 6 K

1 R t o 1 0 0 K

5 % t o l e r a n c e

o h m s

0 R 1 t o 1 0 K

0 R 1 t o 1 5 K

0 R 1 t o 2 0 K 0 R 1 5 t o 5 6 K 0 R 2 t o 1 0 0 K

T C R ( - 5 5 ° t o 2 0 0 ° C )

p p m / ° C

≥ 5 ohms < 10 ohms: ±400

≥ 10 ohms: ±200

This table indicates the CECC specification requirements, and these are met or exceeded by the corresponding W20 series products

Applicable to commercial and approved ranges

L i m i t i n g e l e m e n t v o l t a g e

v o l t s

1 0 0

1 6 0

2 0 0

5 0 0

7 5 0

S t a n d a r d v a l u e s

E 2 4 p r e f e r r e d . O t h e r v a l u e s t o s p e c i a l o r d e r

T h e r m a l i m p e d a n c e

° C / w a t t

8 8

5 8

4 4

2 9

2 2

A m b i e n t t e m p e r a t u r e r a n g e

Physical Data

Dimensions

(mm) and Weight (g)

° C

- 5 5 t o 2 0 0

Type

W21

L max

12.7

D max

5.6

f min

22.75

d nom

0.8

Wt.nom

W215

W22

W23

22.0

38.0

7.0

8.0

23.1

0.8

3.5

W24

53.5

8.0

0.8

400

300

W21

W215

W22

W23

W24

Construction

A high purity 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; the vitreous enamel protective coating is then applied.

200

Terminations

Material Copper clad steel wire, nickel plated and solder-coated.

Strength

The terminations meet the requirements of IEC 68.2.21.

100

Solderability

Length

The terminations meet the requirements of IEC 115-1,– Clause 4.17.3.2.

W23’s and W24’s are not supplied on tape. Minimum lead length is 30 mm.

5 10 15

Dissipation – Watts

Marking

The resistors are legend marked with type reference, resistance value and tolerance. Values are

marked in accordance with IEC 62.

electronics Components reserves the make changes changes in specification without notice or liability. or liability.

All information is subject to TT electronics’ own data and is considered accurate at time of going to print.

General Note

product specification without notice

All information is subject to Welwyn’s own data and is considered accurate at time of going to print. A subsidiary of

TT electronics plc

www.bitechnologies.com www.irctt.com www.welwyn-tt.com

? Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK

? +44 (0) plc

Telephone: electronics 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

10. 13

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