RTOP

www.vishay.com

Vishay Sfernice

Revision: 09-Nov-15

4

Document Number: 50045

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

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.

ENERGY CURVE

POWER CURVE

MARKING

Series,

style,

ohmic

value

(in),

tolerance

(in

%),

manufacturing date, Vishay Sfernice trademark.

POWER RATING

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.

0.01

0.1

1

10

100

1000

OVERLOAD DURATION IN s

RTOP

DRTOP

10

-7

10

-6

10

-5

10

-4

10

-3

10

-2

10

-1

10

0

100

1000

10 000

100 000

1 000 000

10

-7

10

-6

10

-5

10

-4

10

-3

10

-2

10

-1

10

0

OVERLOAD DURATION IN s

RTOP

DRTOP

PACKAGING

Box of 10 units

0

20

40

60

80

100

120

140

0

20

40

60

80

100

HEATSINK TEMPERATURE IN °C