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RTO 50
Vishay Sfernice
Power Resistor, Thick Film Technology
FEATURES
* 50 Watt at 25C 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 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.
DIMENSIONS in millimeters
RTO 50F - LEADED
4.5
RTO 50C - FOR SURFACE MOUNTING
4.5
10.1
O 3.6
10.1
O 3.6
1.3
1.3
12.5
15
8.8
12.5
15
8.8
2
13.7
3
1.8
0.3
5.08
O 0.8
2.5
* Tolerance unless otherwise specified: 0.4mm
5.08
MECHANICAL SPECIFICATIONS
Mechanical Protection Resistive Element Connections Weight Molded Thick Film Tinned copper alloy 2g max.
ELECTRICAL SPECIFICATIONS
Resistance Range Tolerances Standard Dissipation and Associated Thermal Resistance and Nominal Power 0.010 to 1M 1% to 10% Onto a heatsink 50W at + 25C RTH (j-c): 2.6C/W free air: 2.25W at + 25C See Performance table 150ppm/C 300V 2000VRMS - 1 Minute - 10mA Max 106 M 0.1 H 1.8 k
DIMENSIONS
Standard Package TO 220 Insulated Case
Temperature Coefficient Standard Limiting Element Voltage Dielectric Strength MIL STD 202 (301) Insulation Resistance Inductance Critical Resistance
ENVIRONMENTAL SPECIFICATIONS
Temperature Range Climatic Category Sealing - 55C to + 155C 55/155/156 Sealed container Solder immersion
Document Number: 50035 Revision 14-Jan-05
For technical questions, contact sfer@vishay.com
www.vishay.com 17
RTO 50
Vishay Sfernice
PERFORMANCE
TESTS Momentary Overload Us < 1.5UL Rapid Temperature Change 5 cycles - 55C to + 155C Load Life Humidity (Steady State) Method 103 B Cond. D Vibration Method 204 Cond. D Terminal Strength Method 211 Cond. A1 CONDITIONS NF EN 140000 2Pr/5s NF EN 140000 CEI 68214 Tests Na NF EN 140000 Pr at + 25C CEI 115_1 MIL STD 202 MIL STD 202 MIL STD 202 TYPICAL DRIFTS (0.25% + 0.05)
Power Resistor Thick Film Technology
(0.5% + 0.05) (1% + 0.05) (0.5% + 0.05) (0.2% + 0.05) (0.2% + 0.05)
SPECIAL FEATURES
Resistance Values Tolerances Temperature Coefficient Standard 900ppm/C 700ppm/C 0.010 0.015 0.1 1% at 10% 250ppm/C 150ppm/C 0.5
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 155C. The dissipated power is simply calculated by the following ratio: P= T (1)
[RTH (j-c) + RTH (c-a)]
P: T: RTH: RTH: Example:
expressed in W difference between maximum working temperature and room temperature. (j-c): (c-a): thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component: (Special Features Table) 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.
RTH: (c-a) for RTO 50 power rating 13 W at ambient temperature + 30C. Thermal resistance RTH (j-c): 25C/W Considering equation (1) we have: T 155C - 30C 125C 125 T RTH (j-c) + RTH (c-a) = = = 9.6C/W 13 P RTH (c-a) 9.6C/W - 2.6C/W 7C/W
www.vishay.com 18
For technical questions, contact sfer@vishay.com
Document Number: 50035 Revision 14-Jan-05
RTO 50
Power Resistor Thick Film Technology
OVERLOADS
The applied voltage must always be lower than the maximum overload voltage of 450V. The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink.
Vishay Sfernice
ENERGY CURVE
10 ENERGY IN JOULES
1
0.1
0.01
10-6
10-5
10-4
10-3
10-2
OVERLOAD DURATION IN SECONDS
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 1Nm.
100
% RATED POWER
75
50
25
0 0
25
40
60
80
100
120
140
155
HEATSINK TEMPERATURE IN DEGREES CELSIUS
MARKING
Model, Style, Resistance Value (in ), Tolerance (in %), Manufacturing Date, VISHAY trademark.
PACKAGING
Tube of 50 units
ORDERING INFORMATION
RTO MODEL 50 STYLE F CONNECTIONS F: Leaded C: Surface Mount 100 k RESISTANCE VALUE 1% TOLERANCE 1% 2% 5% 10% xxx CUSTOM DESIGN Optional on request: special TCR, shap, etc.
Document Number: 50035 Revision 14-Jan-05
For technical questions, contact sfer@vishay.com
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 Revision: 08-Apr-05
www.vishay.com 1

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