VISHAY RTO 50F 10K Datasheet

RTO 50

Vishay Sfernice

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

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 50 W 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.

DIMENSIONS in millimeters

RTO 50F - LEADED RTO 50C - FOR SURFACE MOUNTING

10.1
Ø 3.6

1.3

4.5

10.1
Ø 3.6

4.5

1.3

RoHS

COMPLIANT

15

12.5

13.7

Ø 0.8

5.08

• Tolerance unless otherwise specifi ed: ± 0.4 mm

2.5

MECHANICAL SPECIFICATIONS

Mechanical Protection Molded

Resistive Element Thick Film

Connections Tinned copper alloy

Weight 2 g 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

8.8

• Only for RTO 50 version C = during surface mount soldering, the soldering temperature
profi le must not cause the metal tab of this device to exceed 220 °C.

ELECTRICAL SPECIFICATIONS

Resistance Range 0.010 Ω to 1 MΩ serie E24

Tolerances Standard ± 1 % to ± 10 %

Dissipation and Associated Onto a heatsink

Thermal Resistance 50 W at + 25 °C

and Nominal Power R

free air:

2.25 W at + 25 °C

Temperature Coeffi cient See Performance table

Standard ± 150 ppm/°C

Limiting Element Voltage 300 V

Dielectric Strength

MIL STD 202 (301)

Insulation Resistance ≥ 10

Inductance ≤ 0.1 µH

Critical Resistance 1.8 kΩ

1.8

5.08

12.5

15

2

3

0.3

TH (j-c): 2.6 °C/W

RMS - 1 Minute - 10mA Max

2000 V

6

MΩ

8.8

Document Number: 50035
Revision 30-May-06

For technical questions, contact [e-mail]

www.vishay.com

17

RTO 50

Vishay Sfernice

Power Resistor Thick Film Technology

PERFORMANCE

TESTS CONDITIONS TYPICAL DRIFTS

Us < 1.5 UL

5 cycles - 55 °C to + 155 °C

Load Life NF EN 140 000 Pr at + 25 °C, 1000 hrs. CEI 115_1 ± (1 % + 0.05 Ω)

Humidity (Steady State)

Method 103 B Cond. D

Vibration
Method 204 Cond. D

Terminal Strength

NF EN 140 000Momentary Overload

NF EN 140 000Rapid Temperature Change

CEI 68214 Tests Na

MIL STD 202 ± (0.5 % + 0.05 Ω)

MIL STD 202 ± (0.2 % + 0.05 Ω)

MIL STD 202 ± (0.2 % + 0.05 Ω)

± (0.25 % + 0.05 Ω)

2 Pr/5 s

± (0.5 % + 0.05 Ω)

SPECIAL FEATURES

Resistance Values ≥ 0.010 Ω ≥ 0.015 Ω ≥ 0.1 Ω ≥ 0.5 Ω

Tolerances ± 1 % at ± 10 %

Temperature

Standard ± 900 ppm/°C ± 700 ppm/°C ± 250 ppm/°C ± 150 ppm/°C

Coeffi cient

CHOICE OF THE HEATSINK

The user must choose according to the working conditions of the component (power, room temperature).

Maximum working temperature must not exceed 155 °C. The dissipated power is simply calculated by the following ratio:

P =

[R

P: expressed in W

T: difference between maximum working temperature and room temperature

R

TH: (j-c): thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal

resistance of the component: (Special Features Table)

R

TH: (c-a): thermal resistance value measured between outer side of the resistor and room temperature. It is the

thermal resistance of the heatsink itself (type, shape) and the quality of the fastening device

Example:

R

TH: (c-a) for RTO 50 power rating 13 W at ambient temperature + 30 °C

Thermal resistance R

TH (j-c): 26 °C/W

Considering equation (1) we have:

ΔT

RTH (j-c) + RTH (c-a) = = = 9.6 °C/W

RTH (c-a)

≤ 155 °C - 30 °C ≤ 125 °C

125

ΔT

13

P

≤ 9.6 °C/W - 2.6 °C/W ≤ 7 °C/W

ΔT

TH (j-c) + RTH (c-a)]

(1)

www.vishay.com
18

For technical questions, contact [e-mail]

Document Number: 50035

Revision 30-May-06

RTO 50

Power Resistor Thick Film Technology

Vishay Sfernice

OVERLOADS

The applied voltage must always be lower than the maximum overload voltage of 450 V.
The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink.

ENERGY CURVE

10

1

0.1

ENERGY IN JOULES

0.01
10

POWER RATING CHART

The temperature of the heatsink should be maintained within the limits specifi ed.
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.

-6

OVERLOAD DURATION IN SECONDS

10

-5

10-4 10

-3

-2

10

100

75

50

% RATED POWER

25

0

0 25 40 60 80 100 120 140 155

MARKING

HEATSINK TEMPERATURE IN DEGREES CELSIUS

Model, Style, Resistance Value (in ), Tolerance (in %), Manufacturing Date, VISHAY trademark.

PACKAGING

Tube of 50 units

ORDERING INFORMATION

RTO 50 F 100K 1 % xxx TU50 e1

MODEL STYLE CONNECTIONS RESISTANCE VALUE TOLERANCE CUSTOM DESIGN PACKAGING LEAD (Pb)-free

F: Radial Leads ± 1% Optional
C: Surface Mount ± 2% on request:
± 5% special TCR,
± 10% shape etc.

SAP PART NUMBERING GUIDELINES

RTO 050 F 1000L F T E1

MODEL STYLE CONNECTIONS RESISTANCE VALUE TOLERANCE PACKAGING LEAD (Pb)-free

Document Number: 50035
Revision 30-May-06

For technical questions, contact [e-mail]

www.vishay.com

19

Legal Disclaimer Notice

Vishay

Notice

Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.

Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.

The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.

Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1