LTO 50 www.vishay.com Vishay Sfernice Power Resistor Thick Film Technology FEATURES • 50 W at 25 °C case temperature heatsink mounted • Direct mounting ceramic on heatsink • Broad resistance range: 0.010 to 550 k • Non inductive • TO-220 package: Compact and easy to mount • Material categorization: For definitions of compliance please see www.vishay.com/doc?99912 LTO series are the extension of RTO types. We used the direct ceramic mounting design (no metal tab) of our RCH power resistors applied to semiconductor packages. DIMENSIONS in millimeters 3.2 10.4 3.2 16.2 Ø 3.2 1.3 3.5 12.7 0.8 0.6 1.8 5 08 Note • Tolerances unless stated: ± 0.3 mm STANDARD ELECTRICAL SPECIFICATIONS MODEL SIZE RESISTANCE RANGE LTO 50 TO-220 0.010 to 550K TEMPERATURE COEFFICIENT ± ppm/°C CRITICAL RESISTANCE 150, 250, 700, 900 5K RATED POWER LIMITING ELEMENT TOLERANCE P25 °C VOLTAGE UL ±% W V 50 500 1, 2, 5, 10 MECHANICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS Mechanical Protection Dissipation and Associated Resistive Element Substrate Connections Weight Mounting Torqure Molded Thick film Alumina Tinned copper 2 g max. Power Rating and Thermal Resistance of the Component Temperature Coefficient 1 Nm Standard Onto a heatsink 50 W at + 25 °C (case temp.) RTH (j - c): 2.5 °C/W Free air: 2.5 W at + 25 °C See Performance table ± 150 ppm/°C ENVIRONMENTAL SPECIFICATIONS Dielectric Strength MIL STD 202 1500 VRMS - 1 min 10 mA max. Temperature Range Insulation Resistance 104 M Inductance 0.1 μH Climatic Category Flammability Revision: 01-Aug-13 - 55 °C to + 155 °C 55/155/56 IEC 60695-11-5 2 applications 30 s separated by 60 s Document Number: 50050 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 LTO 50 www.vishay.com Vishay Sfernice PERFORMANCE TESTS CONDITIONS REQUIREMENTS EN 60115-1 1.5 Pr/5 s US < 1.5 UL ± (0.5 % + 0.005 ) EN 60115-1 IEC 60068-2-14 Test Na 5 cycles - 55 °C to + 155 °C ± (0.5 % + 0.005 ) EN 60115-1 1000 h Pr at + 25 °C ± (1 % + 0.005 ) MIL-STD-202 method 103 B cond. D ± (0.5 % + 0.005 ) Vibration MIL-STD-202 method 204 cond. D ± (0.2 % + 0.005 ) Terminal Strength MIL-STD-202 method 211 cond. A1 ± (0.2 % + 0.005 ) 100G, MIL-STD-202 method 213 cond. I ± (0.5 % + 0.005 ) Momentary Overload Rapid Temperature Change Load Life Humidity (Steady State) Shock SPECIAL FEATURES 0.010 Resistance Values 0.015 Tolerances Typical Temperature Coefficient (- 55 ° to + 155 °C) 0.1 0.5 ± 250 ppm/°C ± 150 ppm/°C ± 1 % at ± 10 % ± 900 ppm/°C ± 700 ppm/°C 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 150 °C. The dissipated power is simply calculated by the following ratio: 1 T P = ------------------------------------------------------------------------------------------R TH (j - c) + R TH (c - h) + R TH (h - 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. RTH (c - h): Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. This is the thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device. RTH (h - a): Thermal resistance of the heatsink. Example: RTH (c - a) for LTO 50 power rating 10 W at ambient temperature + 25 °C Thermal resistance RTH (j - c): 2.5 °C/W Considering equation (1) we have: T = 150 °C - 25 °C = 125 °C T 125 - = -------- = 12.5 °C/W RTH (j - c) + RTH (c - h) + RTH (h - a) = ----P 10 RTH (c - h) + RTH (h - a) = 12.5 °C/W - 2.5 °C/W = 10 °C/W with a thermal grease RTH (c - h) = 1 °C/W, we need a heatsink with RTH (h - a) = 9 °C/W. Revision: 01-Aug-13 Document Number: 50050 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 LTO 50 www.vishay.com Vishay Sfernice OVERLOADS POWER RATING In any case the applied voltage must be lower than the maximum overload voltage of 750 V. The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. The temperature of the case should be maintained within the limits specified. To improve the thermal conductivity, surfaces in contact should be coated with a silicone grease and the torque applied on the screw for tightening should be around 1 Nm. ENERGY CURVE 125 RATED POWER IN % ENERGY IN JOULES 100 10 1 0.1 0.01 10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 OVERLOAD DURATION IN s 100 75 50 25 0 0 20 40 60 80 100 120 140 150 CASE TEMPERATURE IN °C POWER CURVE 1 000 000 PACKAGING Tube of 50 units POWER IN W 100 000 MARKING 10 000 Model, style, resistance value (in ), tolerance (in %), manufacturing date, Vishay Sfernice trademark. 1000 100 10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 OVERLOAD DURATION IN s Revision: 01-Aug-13 Document Number: 50050 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 LTO 50 www.vishay.com Vishay Sfernice ORDERING INFORMATION LTO 50 F 2.7 k ±1% xxx TU50 e3 MODEL STYLE CONNECTIONS RESISTANCE VALUE TOLERANCE CUSTOM DESIGN Optional on request: Special TCR, shape etc. PACKAGING LEAD (Pb)-FREE ±1% ±2% ±5% ± 10 % GLOBAL PART NUMBER INFORMATION L T O 0 5 0 F 2 7 0 0 0 J T E 3 GLOBAL MODEL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING LEAD (Pb)-FREE LTO 050 F = Radial leads The first four digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point. 48R70 = 48.7 48701 = 48 700 10002 = 100 000 R0100 = 0.01 R4700 = 0.47 27000 = 2700 = 2.7 k F=1% G=2% J=5% K = 10 % T = Tube E3 = Pure tin Revision: 01-Aug-13 Tube 50 pieces Document Number: 50050 4 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. 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