RPH 100 www.vishay.com Vishay Sfernice Power Resistor for Mounting onto a Heatsink Thick Film Technology FEATURES High power rating Low thermal radiation of the case Wide ohmic value range Easy mounting High overload capabilities Reduced size and weight Material categorization: for definitions of compliance DESIGN SUPPORT TOOLS click logo to get started please see www.vishay.com/doc 99912 Models Available This new style has been developed as an extension to RCH range. Through the use of thick film technology, a non-inductive solution for power resistors is available which are rated up to 100 W at +25 C. The terminations position prevents any risk of an electrical arc to the heatsink. This resistor series can replace and offer advantages to standard wirewound devices. DIMENSIONS in millimeters 65.2 0.4 35 V Connections 42.4 0.5 4.2 25.6 0.4 4 37 46.7 16.6 18.5 0.4 21.15 0.7 4.2 Note Tolerances unless stated: 0.2 mm STANDARD ELECTRICAL SPECIFICATIONS RESISTANCE RATED POWER LIMITING ELEMENT TEMPERATURE TOLERANCE MODEL SIZE RANGE P VOLTAGE U COEFFICIENT 25 C L % W V ppm/C (1) RPH 100 100 0.092 to 1M 100 1900 1, 2, 5, 10 150 Note (1) E24 series MECHANICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS Mechanical Protection Insulated case UL 94 V-0 Continuous 100 W at 25 C Power Rating chassis mounted 0.45 C/W Resistive Element Cermet Momentary 10 W at 25 C free air Alumina on metallic base of Substrate nickel coated aluminum Temperature 300 ppm/C < 1 Standard End Connections V connections: Screws M4 x 6 Coefficient 150 ppm/C > 1 Tightening Torque Thermal Resistance 0.55 C/W 1 Nm Connections Dielectric Strength 5 kV , 1 min, RMS Tightening Torque Heatsink 3 Nm MIL STD 202 10 mA max. Weight 60 g 10 % 6 Insulation Resistance 10 M ENVIRONMENTAL SPECIFICATIONS Inductance 0.1 H Thermal Resistance R 0.55 C/W th (j - c) Temperature Range -55 C to +125 C Climatic Category 55 / 125 / 56 Revision: 16-Nov-17 Document Number: 50046 1 For technical questions, contact: sferfixedresistors vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000 RPH 100 www.vishay.com Vishay Sfernice PERFORMANCE TESTS CONDITIONS REQUIREMENTS NF EN 140 000 CEI 115 1 Short Time Overload < (0.25 % + 0.05 ) 4 Pr / 5 s U < 2 U S L NF EN 140000 CEI 68214 Test Na Rapid Temperature Change < (0.25 % + 0.05 ) 5 cycles, -55 C, +125 C Load Life NF EN 140 000 < (0.5 % + 0.05 ) (Chassis Mounted 0.45 C/W) Pr at 25 C, 1000 h MIL STD 202 Method 103 B Test D Humidity (Steady State) < (0.5 % + 0.05 ) 56 days, 95 % RH RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR Ohmic Value < 1 > 1 Standard Tolerance 5 % 5 % Standard TCR 300 ppm/C 150 ppm/C Tolerance On Request 1 % to 2 % 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 m. In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) should be coated with a silicone grease (type SI 340 from Rhne-Poulenc or Dow 340 from Dow Corning). The fastening of the resistor to the heatsink is under pressure control of two screws (not supplied). RPH 100 Tightening Torque on Heatsink 3 Nm In order to improve the dissipation, either forced-air cooling or liquid cooling may be used. Do not forget to respect an insulation value between two resistors (dielectric strength in dry air 1 kV/mm). 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 125 C. The dissipated power is simply calculated by the following ratio: T P = ------------------------------------------------------------------------------------------- R ++R R TH (j - c) TH (c - h) TH (h - a) P: Expressed in W T: Difference between maximum working temperature and room temperature R : Thermal resistance value measured between resistive layer and outer side of the resistor. TH (j - c) It is the thermal resistance of the component: 0.55 C/W. R : Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. TH (c - h) This is the thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device. R : Thermal resistance of the heatsink. TH (h - a) Example: R for RPH 100 power rating 80 W at ambient temperature +40 C. TH (c - a) T 125 C - 40 C 85 C T 85 R + R + R = ------- = ----- = 1.06 C/W TH (j - c) TH (c - h) TH (h - a) P 80 R + R 1.06C/W - 0.55 C/W 0.51 C/W TH (c - h) TH (h - a) Revision: 16-Nov-17 Document Number: 50046 2 For technical questions, contact: sferfixedresistors vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000