RPH 100 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 Compliant to RoHS directive 2002/95/EC 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 V Connections RPH 100 42.4 0.5 4 16.6 18.5 0.4 21.15 0.7 65.2 0.4 35 O 4.2 25.6 0.4 37 46.7 O 4.2 Tolerance unless otherwise specified: 0.3 mm MECHANICAL SPECIFICATIONS Mechanical Protection Substrate Resistive Element End Connections Tightening Torque Connections Tightening Torque Heatsink Weight Insulated case Alumina on metallic base of nickel coated aluminum Cermet V connections: Screws M4 x 6 1 Nm 3 Nm 60 g ELECTRICAL SPECIFICATIONS 0.092 to 1 M E24 series Resistance Range Tolerances 1 % to 10 % Power Rating: Continuous 100 W at 25 C chassis mounted 0.45 C/W 10 W at 25 C Free air Momentary 400 W at 25 C for 5 s Temperature Coefficient Standard ENVIRONMENTAL SPECIFICATIONS Thermal Resistance Temperature Range Climatic Category Document Number: 50046 Revision: 17-Sep-09 Rth (j - c) 0.55 C/W - 55 C to + 125 C 55/125/56 Limiting Element Voltage UL Dielectric Strength MIL STD 202 300 ppm/C < 1 150 ppm/C > 1 1900 VRMS 5 kVRMS 1 min 10 mA max. Insulation Resistance > 106 M Inductance < 0.1 H For technical questions, contact: sfer@vishay.com www.vishay.com 53 RPH 100 Vishay Sfernice Power Resistor for Mounting onto a Heatsink Thick Film Technology PERFORMANCE TESTS Short Time Overload Rapid Temperature Change Load Life (Chassis Mounted 0.45 C/W) Humidity (Steady State) CONDITIONS REQUIREMENTS NF EN 140000 CEI 115_1 4 Pn/5 s US < 2 UL < (0.25 % + 0.05 ) NF EN 140000 CEI 68214 Test Na 5 cycles - 55 C + 125 C < (0.25 % + 0.05 ) NF EN 140000 Pn at 25 C 1000 h < (0.5 % + 0.05 ) MIL STD 202 Method 103 B Test D 56 days 95 % RH < (0.5 % + 0.05 ) RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR Ohmic Value <1 >1 Standard Tolerance 5% 5% 300 ppm/C 150 ppm/C Standard TCR Tolerance On Request 1%-2% 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 125 C. The dissipated power is simply calculated by the following ratios: (1) T P = ----------------------------------------------------[ R th (j - c) + R th (c - a) ] P: Expressed in W T: Difference between maximum working temperature and room temperature. Rth (j - c): Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component: 0.55 C/W. Rth (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: Rth (c - a): For RPH 100 power rating 80 W at ambient temperature + 40 C. Thermal resistance Rth (j - c): 0.55 C/W Considering equation (1) we have: T 125 C - 40 C 85 C T 85 Rth (j - c) + Rth (c - a) = ------- = ------ = 1.06 C/W P 80 Rth (c - a) 1.06 C/W - 0.55 C/W 0.51 C/W RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK Surfaces in contact must be carefully cleaned. The heatsink must have an acceptable fl atness: 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 Rhone-Poulenc or Dow 340 from Dow Corning). The fastening of the resistor to the heatsink is under pressure control of four screws (not supplied). Tightening torque: 3 Nm In order to improve the dissipation, either forced-air cooling or liquid cooling may be used. www.vishay.com 54 For technical questions, contact: sfer@vishay.com Document Number: 50046 Revision: 17-Sep-09 RPH 100 Power Resistor for Mounting onto a Heatsink Thick Film Technology Vishay Sfernice Do not forget to respect an insulation value between two resistors (dielectric strength in dry air 1 kV/mm). OVERLOADS In any case the applied voltage must be lower than 2 Un. Umax. < 2 Un < 3800 V. Short time overload: 4 Pn/5 s. Accidental overload: The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. ENERGY CURVE ENERGY IN JOULES 1000 100 10 1 0.1 1.10 -7 1.10 -6 1.10 -5 1.10 -3 1.10 -2 1.10 -4 OVERLOAD DURATION IN s 1.10 -1 1 POWER RATING CHART For resistor mounted onto a heatsink with thermal resistance of 0.45 C/W. 100 % RATED POWER 80 60 40 20 0 0 20 40 60 80 100 120 140 AMBIENT TEMPERATURE IN C MARKING Series. style, ohmic value (in ). tolerance (in %), manufacturing date, SFERNICE trade mark. ORDERING INFORMATION RPH 100 3.3 k 5% V XXX MODEL STYLE RESISTANCE VALUE TOLERANCE CONNECTIONS CUSTOM DESIGN Optional V: M4 screw Options on request TCR, shape, etc. 1% 2% 5% Document Number: 50046 Revision: 17-Sep-09 For technical questions, contact: sfer@vishay.com www.vishay.com 55 RPH 100 Power Resistor for Mounting onto a Heatsink Thick Film Technology Vishay Sfernice GLOBAL PART NUMBER INFORMATION R P H 1 0 0 V 1 0 0 0 2 J B GLOBAL MODEL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING SPECIAL RPH 100 V = M4 screw The firts four digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point. F=1% G=2% J=5% K = 10 % B = Box 5 pieces As applicable Ex = XXX 48R70 = 48.7 48701 = 48 700 10002 = 100 k R0100 = 0.01 R6800 = 0.68 27000 = 2700 = 2K7 www.vishay.com 56 For technical questions, contact: sfer@vishay.com Document Number: 50046 Revision: 17-Sep-09 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. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 18-Jul-08 www.vishay.com 1