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RCH Vishay Sfernice Power Resistors, for Mounting onto a Heatsink Thick Film Technology FEATURES • 5 W to 50 W • High power rating • High overload capabilities up to 2500 VRMS • Wide resistance range from 0R24 to 1 MΩ Manufactured in cermet thick film technology, these power resistors exhibit remarkable characteristics and the series includes 4 types ranging from 5 W to 50 W. Designed to be mounted onto a heatsink, the resistors can bear high short time overloads and 3 types of terminations are available.
RCH Vishay Sfernice Power Resistors, for Mounting onto a Heatsink Thick Film Technology MECHANICAL SPECIFICATIONS Mechanical Protection Substrate Resistive Element Connections ELECTRICAL SPECIFICATIONS Insulated case Alumina Cermet Tinned copper alloy 0.24 Ω to 1 MΩ E24 series Resistance Range Standard Resistance Tolerances ± 1 %, ± 2 %, ± 5 %, ± 10 % Power Rating: Chassis Mounted 5 W to 50 W Unmounted 2 W to 5.
RCH Vishay Sfernice Power Resistors, for Mounting onto a Heatsink Thick Film Technology RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK Surfaces in contact must be carefully cleaned. The heatsink must have an acceptable flatness: from 0.05 mm to 0.1 mm/100 mm. Roughness of the heatsink must be around 6.3 µm. In order to improve thermal conductivity, surfaces in contact (alumina, heat-sink) are coated with a silicone grease (type Sl 340 from Rhône-Poulenc or Dow 340 from Dow Corning).
Power Resistors, for Mounting onto a Heatsink Thick Film Technology RCH Vishay Sfernice OVERLOADS The applied voltage must always be lower than the maximum overload voltage as shown in the special features table. The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. ENERGY CURVE 1000 ENERGY IN JOULES 100 RCH 50 RCH 25 RCH 10 RCH 5 10 1 0.
RCH Vishay Sfernice Power Resistors, for Mounting onto a Heatsink Thick Film Technology GLOBAL PART NUMBER INFORMATION R GLOBAL MODEL RCH C H 1 0 S 3 3 0 0 0 J S 0 6 SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING SPECIAL 05 10 25 50 R = Round lead V = M2 screw S = Flat with hole The firts four digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point.
Legal Disclaimer Notice Vishay Disclaimer All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product.
