63

6

6

10

≤ 1.4 mm

Cement Coated

Wirewound Resistors

W30 Series

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

100

Issue D · 07.06

Welwyn Components

Maximum

Typical

Load:

1000 hrs 3 watts @ 25°C

∆R%

5.0 + .001

Ω

3.5

1000 hrs 2.5 watts @ 70°C

∆R%

5.0 + .001

Ω

3.5

Dry heat: 1000 hrs at 200°C

∆R%

5.0 + .001

Ω

3.5

Derating from room temperature

see derating curve

Short term overload 10 x rated power for 5 seconds

∆R%

5.0 + .001

Ω

1.0

Climatic

∆R%

5.0 + .001

Ω

3.5

Climatic category

55/200/56

Long term damp heat: 56 days

∆R%

3.0 + .001

Ω

1.0

Temperature rapid change

∆R%

2.0 + .001

Ω

1.5

Resistance to solder heat

∆R%

5.0 + .001

Ω

2.0

Vibration and bump

∆R%

5.0 + .001

Ω

2.0

Voltage proof

volts

500 min

Pulse handling

Data available by request

Performance Data

20

40

60

80 100 120 140 160 180 200 220 240 260 280

130

120

110

100

90

80

70

60

50

40

30

20

10

0

Temp

W31 Series Derating Curve

Type

W31

Ammo pack

1000

Reel

1000

Standard Quantities Per Package

Application Notes

The terminations should not be bent closer than 1.6mm from

the body, and the recommended minimum bend radius is

1.2mm.

Care must be taken when determining clearance between the

resistor body and the P.C.B. or other components. Resistance

is measured 6mm from body.

Packaging

The standard method of packaging is taped in ammo packs.

Can be provided on reels by request.

W31 resistors can be supplied preformed.

Contact factory for details.