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17

RTO 50

Vishay Sfernice

Document Number: 50035

Revision 14-Jan-05

For technical questions, contact sfer@vishay.com

Power Resistor, Thick Film Technology

FEATURES

• 50 Watt at 25°C Heatsink Mounted

• Adjusted by sand trimming

• Leaded or surface mount versions

• High power to size ratio

• Non inductive element

MECHANICAL SPECIFICATIONS

Mechanical Protection

Molded

Resistive Element

Thick Film

Connections

Tinned copper alloy

Weight

2g max.

DIMENSIONS

Standard Package

TO 220

Insulated Case

ENVIRONMENTAL SPECIFICATIONS

Temperature Range

- 55°C to + 155°C

Climatic Category

55/155/156

Sealing

Sealed container

Solder immersion

Because of the knowledge and experience in Thick Film technology, Vishay Sfernice has been able to develop a high power

resistor in a TO 220 package called RTO 50. The special design of this component allows the dissipation of 50W when mounted

on a heatsink. The ohmic value is adjusted by sand trimming. This process does not generate hot spots as in laser trimming,

which could lead to microcracks on each side of the curve. This process improves the reliability and the stability of the resistor

and at the same time gives a good overload capability.

• Tolerance unless otherwise specified: ± 0.4mm

RTO 50F - LEADED

RTO 50C - FOR SURFACE MOUNTING

4.5

1.3

8.8

Ø 0.8

10.1

13.7

12.5

5.08

15

Ø 3.6

2.5

4.5

1.3

8.8

10.1

12.5

5.08

15

Ø 3.6

0.3

1.8

3

2

DIMENSIONS in millimeters

Resistance Range

0.010Ω to 1MΩ

Tolerances Standard

± 1% to ± 10%

Dissipation and Associated

Onto a heatsink

Thermal Resistance

50W at + 25°C

and Nominal Power

free air:

2.25W at + 25°C

Temperature Coefficient

See Performance table

Standard

± 150ppm/°C

Limiting Element Voltage

300V

Dielectric Strength

MIL STD 202 (301)

Insulation Resistance

Inductance

≤ 0.1 µH

Critical Resistance

1.8 kΩ

ELECTRICAL SPECIFICATIONS