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RPS 500
Vishay Sfernice
Power Resistors for Mounting onto a Heatsink Thick Film Technology
FEATURES
* High power rating * High overload capability * Easy mounting * Low thermal radiation of the case
This range has been developed specifically for electrical traction applications and is capable of dissipating 500W at +70C. The remarkable performance characteristics are evident when used in severe pulse conditions. The copper base allows easy mounting on the heatsink and provides optimal dissipation conditions.
DIMENSIONS in millimeters
RPS 500D
73 56
10.5
6
26 1
57 34
O 7.2 35.8 2 M4 USEFUL DEPTH : 8
* Tolerance unless stated: 0.2mm
60
O 4.2
MECHANICAL SPECIFICATIONS
Insulated case Alumina onto base of nickel coated copper Resistive Element Cermet End Connections Screws M4 (M5 on request) Tightening Torque on Connections 2Nm 4Nm Tightening Torque on Heatsink 250g 10% Weight Mechanical Protection Substrate
O 21
ELECTRICAL SPECIFICATIONS
Resistance Range Tolerances Power Rating Chassis mounted Temperature Coefficient Standard Limiting Element Voltage Dielectric Strength* Insulation Resistance Inductance 300ppm/C < 1 150ppm/C > 1 5kVRMS L:7kVRMS - H: 12kVRMS > 106M < 50 nH 0.24 to 1M E24 series 1% to 10% 500W at 70C continuous 1000W at 25C for 10 seconds
ENVIRONMENTAL
Thermal Resistance Temperature Range Climatic Category
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RTH (j-c) 0.11C/W - 55C to + 125C *MIL STD 202, 1 Minute, 10mA Max 55/125/56
For technical questions, contact sfer@vishay.com
Document Number: 50047 Revision 14-Jan-05
RPS 500
Power Resistors for Mounting onto a Heatsink Thick Film Technology
PERFORMANCE
TESTS Momentary Overload Rapid Temperature Change Load Life (chassis mounted) Humidity (steady state) CONDITIONS NF EN 140000 CEI 115_1 2Pn/10 seconds NF EN 140000 CEI 68214 Test Na 5 cycles - 55C to + 125C NF EN 140000 CEI 115_1 1000 hours 500 W/70C (no cycling) MIL STD 202 Method 103 B and D 56 days 95% R.H. TYPICAL DRIFTS < (0.25% + 0.05) < (0.25% + 0.05) < (0.5% + 0.05) < (0.5% + 0.05)
Vishay Sfernice
RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR
Ohmic Standard Tolerance Standard T.C.R. Tolerance On Request < 1 5% 300ppm/C 1% - 2% - 10% > 1 5% 150ppm/C
CHOICE OF THE HEATSINK
The user must choose the heatsink according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 125C. The dissipated power is simply calculated by the following ratio: (1) T P= [RTH (j-c) + RTH (c-a)] P: T: RTH: RTH: expressed in W difference between maximum working temperature and room temperature. (j-c): thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component: 0.11C/W. (c-a): thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal resistance of the heatsink, depending on the heatsink itself (type, shape) and the quality of the fastening device.
RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK
Surfaces in contact must be carefully cleaned. The heater must have an acceptable flatness: from 0.05mm to 0.1mm/100mm. Roughness of the heatsink must be around 6.3m. In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) should be coated with a silicon grease (type SI 340 Rhone-Poulenc or Dow Corning). The fastening of the resistor to the heatsink is under pressure control of two screws. Tightening torque: 4Nm. The following accessories are supplied with each product: 2 off M 4 x 16, 2 off M4 TE 4 x 0.6 and 2 off M4 washers.
Document Number: 50047 Revision 14-Jan-04 For technical questions, contact sfer@vishay.com www.vishay.com 35
RPS 500
Vishay Sfernice
OVERLOADS
Short time overload: 2Pn/10 seconds Accidental overload: The values indicated in the graph below are applicable to resistors in air or mounted onto a heatsink.
Power Resistors for Mounting onto a Heatsink Thick Film Technology
ENERGY CURVE
10000
ENERGY IN JOULES
1000
100
10
1
1.10-7
1.10-6
1.10-5
1.10-4
1.10-3
1.10-2
1.10-1
1
OVERLOAD DURATION IN SECONDS
POWER RATING CHART
The heatsink temperature should be maintained at the values specified in fig. 2. To optimise the thermal conduction, contacting surfaces should be coated with silicone grease and heatsink mounting screws tightened to 4Nm.
100
80
% RATED POWER
60
40
20
0 0 20 40 60 80 100 120 140 HEATSINK TEMPERATURE IN DEGREES CELSIUS
MARKING
Series, style, ohmic value (in ), tolerance (in ), tolerance (in %), manufacturing date, VISHAY trade mark.
ORDERING INFORMATION
RPS MODEL 500D STYLE H CONNECTIONS Optional H: dielectric strength 12kV L: dielectric strength 7kV 100 RESISTANCE VALUE 10% TOLERANCE Optional 1% 2% 5% 10% xxx CUSTOM DESIGN Options on request T.C.R., shape, etc.
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For technical questions, contact sfer@vishay.com
Document Number: 50047 Revision 14-Jan-05
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
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