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Vitreous Enamelled

Wirewound Resistors

Vitreous Resistors

Wirewound Enamelled

W20 Series

Welwyn Components

Solvent Resistance

The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits

Solvent Resistance Flammability

The body protection

are inherently and inherently All materials used the solvents suitable for series resistors

Flammability and marking are resistant to all normal All materials used in the construction of ‘W’ series resistors

industrial cleaning construction of W20 printed circuits. are inorganic and inorganic non-burning. non burning.

Performance Data

CECC 40201-002

Actual Performance

Requirements

Maximum

Typical

Load at commercial rating: 1000 hrs at 25°C

R %

3 . 5

Load at CECC rating: 1000 hours at 25°C

Dry heat: 1000 hours at 200°C

Shelf life: 12 months at room temperature

not specified

0.03

3.5

0.02

Derating

see derating curve

Short term overload

Climatic

Climatic category

Long term damp heat

Temperature rapid change

Resistance to solder heat

Vibration and bump

N o i s e ( i n d e c a d e o f f r e q u e n c y )

Robustness

I n s u l a t i o n r e s i s t a n c e

V o l t a g e P r o o f

μ v / v

o h m s

v o l t s

55/200/56

n o t s p e c i f i e d

1.0

0.5

0.05

0.5

0.25

z e r o

0.4

> 1 G o h m

5 0 0 m i n

0.2

0.02

0.2

0.03

0.05

z e r o

0.05

> 1 G o h m

5 0 0 m i n

Pulse handling

Application Notes

The termination should not be bent closer than 1.6mm from

the body, and the recommended minimum bend radius is

1.2mm. The terminations are solderable to within 4mm from

the body. When cold, vitreous enamel has excellent insulation

resistance. In common with all insulants the specific resistance

of the enamel decreases with increase in temperature.

Therefore, resistors operated at near maximum temperature

cannot be classed as insulated and should not be used in

contact with any conducting material. Care must be taken

when determining clearance distance between the resistor

body and the printed circuit board or other components to

ensure these are not over heated. Resistance is measured

data available by request

Packaging

For W21 and W215 the standard method of packaging is

taped in Ammo Packs. For W22 the standard method of

packaging is taped and reeled. W23’s and W24’s are

available only as loose packed in boxes.

6mm from body.

f 1

f 2

116

Derating Curve

f 1 – f 2

1.4 mm

100

Type

W21

63±2

70 200

Ambient temperature ° C

315

W215

W22

73±2

General Note

TT electronics reserves the right to make changes in product specification without notice or liability.

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

? TT electronics plc

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

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

10. 13

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

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