Document Number: 50045

Revision 14-Jan-05

www.vishay.com

30

RTOP

Vishay Sfernice

For technical questions, contact sfer@vishay.com

OVERLOADS

The applied power is 2.5 x rated power for 5 s with a max voltage of 2 x nominal voltage.

Accidental overload: The values indicated in the graph below are applicable to resistors in air or mounted onto a heatsink.

In case of multi-resistor devices, (DRTOP, TROP and QROP) the results apply to each resistor value in the device.

POWER RATING CHART

The temperature of the heater should be maintained in the limit specified. To improve the thermal conductivity, surfaces in

contact should be laid on with a silicon grease and the torque applied on the screw for tightening should be around 2 Nm.

MARKING

Series, style, ohmic value (in ), tolerance (in %), manufacturing date, VISHAY trade mark.

0

20

40

60

80

100

120

140

HEATSINK TEMPERATURE IN DEGREES CELSIUS

ENERGY CURVE

ORDERING INFORMATION

RTOP

200

3.2

± 1%

± %

V

R1

T1

R2

MODEL

STYLE

OHMIC VALUE

CONNECTIONS

CUSTOM DESIGN

RTOP

100

Optional

To be precise

V: Screw

Optional

DRTOP

50

± 1%

for each

VS: RTOP Shunt

± 2%

resistor

± 5 %

± 10 %

ABSOLUTE TOLERANCE PER RESISTOR

Power Resistors for Mounting onto a Heatsink

Thick Film Technology

OVERLOAD DURATION IN SECONDS

1

RTOP

DRTOP

0.01

0.1

1

10

100

1000

0

20

40

60

80

100