0

20

40

60

80

100

0

50

100

150

200

250

300

350

Ambient Temperature (°C)

Ambient Temperature °C

0

50

100

150

200

250

300

0

1

2

3

4

5

6

7

8

9 10

WHS7

WHS5

WHS3

WHS2

Power (W)

Body Temperature Rise

Wirewound High Surge Resistors

WHS Series

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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

08. 12

Application Notes

1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than

4mm from the body.

2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. The surface temperature rise

at the centre of the body is shown under Thermal Performance.

3. WHS2, WHS3, WHS5 resistors can also be supplied with goalpost or lancet pre-formed leads. Radial form is available on

WHS2 and WHS3 only.

WHS2, WHS3, and WHS5 are also available in an SMD format with Z formed leads and packed in blister tape. See the Z-form

datasheet for details http://www.welwyn-tt.com/pdf/datasheet/Z-form.pdf

Thermal Performance

0.1

1

10

1

10

100

1000

Value (ohms)

s Peak Voltage Limit

(10 pulses at 30s intervals, R < 5%)

Note the voltage shown is the nett voltage across the resistor. At low

values, the generator open circuit voltage will be higher due to the

generator's 2 ohm internal impedance.