LCH 100 www.vishay.com Vishay Sfernice Power Resistor, for Mounting onto a Heatsink Thick Film Technology FEATURES • • • • • • • • • 100 W at 25 °C case temperature High power rating High overload capabilities up to 2500 VRMS Wide resistance range from 0.06 to 1 M High thermal capacity up to 1 °C/W Easy mounting Reduced size and weight High insulation: 106 M Material categorization: For definitions of compliance please see www.vishay.com/doc?99912 DIMENSIONS LCH100...V LCH100...R MODEL LCH 100 M2 Ø2 L 47.8 W 15.5 H 29.4 P Leads Pitch 30.5 F Connections Pitch 39.7 T 21.4 S 8 6 6 LCH100...S 6 H W Ø 2.1 3 4.8 S L P F 6 ØD T 9 ØD 3.2 V Leads M2 Note • General tolerance: ± 0.3 mm STANDARD ELECTRICAL SPECIFICATIONS MODEL SIZE RESISTANCE RANGE RATED POWER (2) P25 °C W LIMITING ELEMENT VOLTAGE V TOLERANCE ±% TEMPERATURE COEFFICIENT ± ppm/°C CRITICAL RESISTANCE LCH 100 100 0.06 to 1M (1) 100 1285 1, 2, 5, 10 150 16 512 Notes (1) E24 series (2) Chassis mounted MECHANICAL SPECIFICATIONS Mechanical Protection Resistive Element Substrate Connections Weight TECHNICAL SPECIFICATIONS Insulated case Cermet Alumina Tinned copper alloy 12 g ENVIRONMENTAL SPECIFICATIONS Temperature Range Climatic Category Revision: 05-Aug-13 Standard Resistance Tolerances Temperature Coefficient ± 1 % to ± 10 % From 0.06 to 1 M only ± 5 % and ± 10 % available ± 150 ppm/°C (R > 1 ) - 55 °C/+ 125 °C Insulation Resistance 106 M Inductance 0.1 μH - 55 °C to 125 °C 55/125/56 Document Number: 50055 1 For technical questions, contact: [email protected] 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 LCH 100 www.vishay.com Vishay Sfernice PERFORMANCE TESTS Momentary Overload Rapid Temperature Change Load Life Humidity (Steady State) CONDITIONS REQUIREMENTS IEC 60115-1 2 Pr/5 s US < 2 UL < ± (0.25 % + 0.05 ) IEC 60115-1 125 °C CEI 68215 Test Na 5 cycles - 55 °C to + 125 °C < ± (0.25 % + 0.05 ) IEC 60115-1 90’ on/30’ off 1000 h Pr at + 25 °C < ± (0.5 % + 0.05 ) IEC 60115-1 IEC 60068-2-3 Test Ca 56 days RH 95 % MIL-STD-202 Method 103 B and C < ± (0.5 % + 0.05) RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR Resistance Value <1 Standard Tolerances Standard TCR IEC 60115-1 - 55 °C/+ 125 °C Tolerance on Request >1 ±5% ± 10 % ± 450 ppm/°C ± 150 ppm/°C ± 1 % to ± 2 % (only for R > 1 to 1 M) SPECIAL FEATURES MODEL Power Rating Chassis Mounted LCH 100 100 W (25 °C case temp.) Thermal Resistance RTH (j - c) 1 °C/W Limiting Element Voltage (VRMS) 1285 V Max. Overload Voltage (VRMS) 2500 V Dielectric Strength (VRMS) 50 Hz, 1 min MIL-STD-202 Method 301 10 mA Max. 3500 V Critical Resistance Revision: 05-Aug-13 16 512 Document Number: 50055 2 For technical questions, contact: [email protected] 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 LCH 100 www.vishay.com Vishay Sfernice 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). • The fastening of the resistor to the heatsink is under pressure control of two screws (not supplied). Tightening Torque on Heatsink LCH 100 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: Expressed in W T: 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 LCH 100 power rating 20 W at ambient temperature + 50 °C. T 125 °C - 50 °C 75 °C RTH (j - c) = 1 °C/W (Special Features) T 75 RTH (j - c) + RTH (c - a) = ------- = ------ = 3.75 °C/W P 20 RTH (c - a) 3.75 °C/W - 1 °C/W 2.75 °C/W Revision: 05-Aug-13 Document Number: 50055 3 For technical questions, contact: [email protected] 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 LCH 100 www.vishay.com Vishay Sfernice OVERLOADS POWER RATING 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. 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. MARKING ENERGY CURVE ENERGY IN JOULES 100 10 80 60 40 20 0 0 1 25 50 100 125 150 CASE TEMPERATURE in °C 0.1 0.01 10-7 RATED DISSIPATION in % 100 Model, style, resistance value (in ), tolerance (in %), manufacturing date, Vishay Sfernice trademark. 10-6 10-5 10-4 10-3 10-2 10-1 100 10-1 100 OVERLOAD DURATION IN s POWER CURVE 1 000 000 POWER IN W 100 000 10 000 1000 100 10-7 10-6 10-5 10-4 10-3 10-2 OVERLOAD DURATION IN s Revision: 05-Aug-13 Document Number: 50055 4 For technical questions, contact: [email protected] 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 LCH 100 www.vishay.com Vishay Sfernice ORDERING INFORMATION LCH 100 3.3 k ±5% R XXX MODEL STYLE RESISTANCE VALUE TOLERANCE CONNECTIONS CUSTOM DESIGN Optional ±1% ±2% ±5% ± 10 % Optional S: Flat with hole R: Round lead V: M2 screw Optional GLOBAL PART NUMBER INFORMATION L C H 1 0 0 R 4 8 7 0 1 J S 0 6 GLOBAL MODEL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING SPECIAL LCH 100 R = Round lead V = M2 screw S = Flat with hole 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 F=1% G=2% J=5% K = 10 % S06 = Bag 25 pieces As applicable Ex = XXX Revision: 05-Aug-13 Document Number: 50055 5 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. 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