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For technical questions, contact: sfer@vishay.com

Document Number: 50005

16

Revision: 05-Jun-07

RTO 20

Vishay Sfernice

Power Resistors Thick Film Technology

OVERLOADS

In any case the applied voltage must be lower than the maximum overload voltage of 375 V.

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

POWER RATING CHART

The temperature of the heatsink should be maintained within the limits specified.

To improve the thermal conductivity, surfaces in contact should be coated with a silicone grease and the torque applied on the

screw for tightening should be around 1 Nm. Spring clip can also be used to mount the component on an heatsink (ex: Kunze,

clip KU4-498).

MARKING

Model, Style, Resistance Value (in

Ω), Tolerance (in %), Manufacturing Date, VISHAY trademark.

PACKAGING

Tube of 50 units

ORDERING INFORMATION

RTO

20

F

U68

5 %

xxx

TU50

e3

MODEL

STYLE

CONNECTIONS

RESISTANCE VALUE

TOLERANCE

CUSTOM DESIGN

PACKAGING

LEAD (Pb)-FREE

F: Radial Leads

C: Surface Mount

± 1 %

± 2 %

± 5 %

± 10 %

Optional

on request:

special TCR,

shape etc.

SAP PART NUMBERING GUIDELINES

RTO

020

F

R6800

J

T

e3

MODEL

STYLE

CONNECTIONS

RESISTANCE VALUE

TOLERANCE

PACKAGING

LEAD (Pb)-FREE

OVERLOAD DURATION IN SECONDS

ENERGY CURVE

0.01

0.1

1

10

100

0

100

75

50

25

0

HEATSINK TEMPERATURE IN °C

20

40

60

80

100

120

140

155

120