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| RCH Vishay Sfernice Power Resistor, 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 0.24 M to 1 M 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. The resistors are non inductive and are particularly suitable for high frequency operation and cut-out circuits. * High thermal capacity up to 0.8 C/W * Easy mounting * Reduced size and weight * High insulation: 106 M * Compliant to RoHS directive 2002/95/EC DIMENSIONS in millimeters RCH...R O2 6 H W RCH...V M2 6 RCH...S 6 3 O 2.1 S L F P 4.8 6 OD T 9 General tolerance: 0.3 mm MODEL L W H P Leads Pitch F Connection Pitch T S OD Weight (g) RCH 5 16.6 9 16.4 10.2 11.3 12.5 5.3 2.4 4 RCH 10 19 11 20.6 12.7 14.3 15.9 5 2.4 5 RCH 25 28 14 27.5 18.3 18.3 19.8 7.7 3.2 7 RCH 50 47.8 15.5 29.4 30.5 39.7 21.4 8 3.2 12 www.vishay.com 40 For technical questions, contact: sfer@vishay.com Document Number: 50006 Revision: 14-Jun-10 RCH Power Resistor, for Mounting onto a Heatsink Thick Film Technology MECHANICAL SPECIFICATIONS Mechanical Protection Substrate Resistive Element Connections Insulated case Alumina Cermet Tinned copper alloy Vishay Sfernice ELECTRICAL RSPECIFICATIONS Resistance Range 0.24 to 1 M E24 series Standard Resistance Tolerances 1 %, 2 %, 5 %, 10 % Power Rating: Chassis Mounted Unmounted 5 W to 50 W 2 W to 5.5 W 150 ppm/C (R > 1 ) 106 M 0.1 H ENVIRONMENTAL SPECIFICATIONS Temperature Range Climatic Category - 55 C to + 125 C 55/125/56 Temperature Coefficient Insulation Resistance Total Inductance PERFORMANCE TESTS Momentary Overload CONDITIONS NF EN140000 CEI 115_1 2 Pr/5 s US < 2 UL NF EN140000 125 C CEI 68215 Test Na 5 cycles - 55 C to + 125 C NF EN140000 CEI 115_1 1000 h Pr at + 25 C 56 days RH 95 % MIL-STD-202 Method 103 B and C TYPICAL DRIFTS < (0.25 % + 0.05 ) Rapid Temperature Change < (0.25 % + 0.05 ) Load Life Humidity (Steady State) < (0.5 % + 0.05 ) < (0.5 % + 0.05 ) RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR Resistance Value Standard Tolerances Standard TCR Tolerance on Request 250 ppm/C 1 % to 2 % <1 5% 10 % 150 ppm/C >1 SPECIAL FEATURES MODEL Power Rating-Chassis Mounted Power Rating-Unmounted Thermal Resistance RTH (j - c) Limiting Element Voltage (VRMS) Max. Overload Voltage (VRMS) Dielectric Strength (VRMS) 50 Hz, 1 min MIL-STD-202 Method 301 10 mA Max. Critical Resistance RCH 5 5W 2W 4.8 C/W 160 V 320 V 2000 V 5120 RCH 10 10 W 2.5 W 3.2 C/W 250 V 500 V 2000 V 6250 RCH 25 25 W 4W 1.4 C/W 550 V 1100 V 3500 V 12 100 RCH 50 50 W 5.5 W 0.8 C/W 1285 V 2500 V 3500 V 33 024 Document Number: 50006 Revision: 14-Jun-10 For technical questions, contact: sfer@vishay.com www.vishay.com 41 RCH Vishay Sfernice Power Resistor, 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 m. In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) are coated with a silicone grease (type Sl 340 from Rhone-Poulenc or Dow 340 from Dow Corning). * The fastening of the resistor to the heatsink is under pressure control of two screws (not supplied). Tightening Torque on heatsink RCH 5 0.5 Nm RCH 10 0.6 Nm RCH 25 0.7 Nm RCH 50 1 Nm * In order to improve the dissipation, either forced-air cooling or liquid cooling may be used. * A low thermal radiation of the case allows several resistors to be mounted onto the same heatsink. * Do not forget to respect an insulation value between two resistors (dielectric strength in dry air 1 kV/mm). * In any case the hot spot temperature, measured locally on the case must not exceed 125 C. * Tests should be performed by the user. CHOICE OF THE HEATSINK The user must choose the heatsink according to 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: (1) T P = ---------------------------------------------------------[ R TH (j - c) + R TH (c - a) ] P: T: Expressed in W Difference between maximum working temperature and room temperature. RTH (j - c): Thermal resistance value measured between resistance layer and outer side of the resistor. It is the thermal resistance of the component (See Special Features table). RTH (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. Example: RTH (c- a): For RCH 25 power rating 20 W at ambient temperature + 50 C. T 125 C - 50 C 75 C T 75 RTH (j - c) + RTH (c - a) = ------- = ------ = 3.75 C/W RTH (j - c) = 1.4 C/W (Special Features) P 20 RTH (c - a) 3.75 C/W - 1.4 C/W 2.35 C/W www.vishay.com 42 For technical questions, contact: sfer@vishay.com Document Number: 50006 Revision: 14-Jun-10 RCH Power Resistor, for Mounting onto a Heatsink Thick Film Technology 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. Vishay Sfernice POWER RATING For resistors mounted onto heatsink and thermal resistance of 1 C/W. To improve the thermal conductivity, surfaces in contact should be coated with a silicone grease. ENERGY CURVE 1000 100 R C H 25 H RC RC H5 RATED POWER IN % 100 H C R 10 75 50 ENERGY IN J 10 RCH 50 RCH 25 RCH 10 RCH 5 50 1 25 0.1 0 10-6 10-5 10-4 10-3 10-2 10-1 0 20 40 60 80 100 120 140 AMBIENT TEMPERATURE IN C OVERLOAD DURATION IN s MARKING Model, style, resistance value (in ), tolerance (in %), manufacturing date, Vishay Sfernice trademark. ORDERING INFORMATION RCH MODEL 25 STYLE 3.3 k RESISTANCE VALUE 5% TOLERANCE Optional 1% 2% 5% 10 % R CONNECTIONS Optional S: Flat with hole R: Round lead V: M2 screw XXX CUSTOM DESIGN Optional GLOBAL PART NUMBER INFORMATION R C H 1 0 S 3 3 0 0 0 J S 0 6 GLOBAL MODEL RCH SIZE 05 10 25 50 LEADS R = Round lead V = M2 screw S = Flat with hole OHMIC VALUE The first four digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point. 4R700 = 4.7 48701 = 48 700 R0100 = 0.01 R6800 = 0.68 27000 = 2700 = 2.7 k TOLERANCE F=1% G=2% J=5% K = 10 % PACKAGING S06 = Bag 25 pieces SPECIAL As applicable Ex = XXX Document Number: 50006 Revision: 14-Jun-10 For technical questions, contact: sfer@vishay.com www.vishay.com 43 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 |
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