Document Number: 28732

For technical questions contact: ff3dresistors@vishay.com

www.vishay.com

Revision: 06-Dec-05

171

VR25

High Ohmic/High Voltage Resistors

Vishay BCcomponents

Derating

Pulse Loading Capability

70

100

50

0

0

50

100

155

- 55

The power that the resistor can dissipate depends on the operating

temperature.

4

6

8

10

20

10

1

(kV)

^

Maximum allowed peak pulse voltage in accordance with

“IEC 60065 chapter 14.1”; 50 discharges from a 1 nF capacitor

charged to

; 12 discharges/minute (drift

∆R/R ≤ 2 %)

V

max

Application Information

100

0

0.1

0.3

0

0.2

20

40

60

80

P (W)

∆T

(K)

Hot-spot temperature rise (

∆T) as a function of dissipated power

50

0

0.1

0.3

0

0.2

10

20

30

40

P (W)

∆T

(K)

5 mm

10 mm

15 mm

Temperature rise (

∆T) at the lead end (soldering point) as a function

of dissipated power at various lead lengths after mounting