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 DESIGN SUPPORT TOOLS click logo to get started Models Available 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 10.4 3.2 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 RESISTANCE RATED POWER LIMITING ELEMENT TEMPERATURE CRITICAL TOLERANCE MODEL SIZE RANGE P VOLTAGE U COEFFICIENT RESISTANCE 25 °C L ± %  W V ± ppm/°C  LTO 50 TO-220 0.010 to 550K 50 500 1, 2, 5, 10 150, 250, 700, 900 5K MECHANICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS Mechanical Protection Molded Dissipation and Associated Onto a heatsink Resistive Element Thick film 50 W at +25 °C (case temp.) Substrate Alumina Power Rating and  R : 2.5 °C/W Thermal Resistance  TH (j - c) Connections Tinned copper Free air: of the Component Weight 2 g max. 2.5 W at +25 °C Mounting Torque 1 Nm Temperature Coefficient See Performance table Standard ± 150 ppm/°C ENVIRONMENTAL SPECIFICATIONS Temperature Range -55 °C to +150 °C Dielectric Strength  1500 VRMS - 1 min MIL STD 202 10 mA max. Climatic Category 55 / 155 / 56 Insulation Resistance  104 M IEC 60695-11-5 Flammability 2 applications 30 s Inductance  0.1 μH separated by 60 s Revision: 16-Nov-17 1 Document Number: 50050 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

LTO 50 www.vishay.com Vishay Sfernice PERFORMANCE TESTS CONDITIONS REQUIREMENTS EN 60115-1 Momentary Overload 1.5 Pr / 5 s ± (0.5 % + 0.005 ) U < 1.5 U S L EN 60115-1 IEC 60068-2-14 Test Na Rapid Temperature Change ± (0.5 % + 0.005 ) 5 cycles -55 °C to +155 °C EN 60115-1 Load Life ± (1 % + 0.005 ) 1000 h Pr at +25 °C MIL-STD-202 Humidity (Steady State) ± (0.5 % + 0.005 ) method 103 B cond. D MIL-STD-202 Vibration ± (0.2 % + 0.005 ) method 204 cond. D MIL-STD-202 Terminal Strength ± (0.2 % + 0.005 ) method 211 cond. A1 100G, MIL-STD-202 Shock ± (0.5 % + 0.005 ) method 213 cond. I SPECIAL FEATURES Resistance Values  0.010  0.015  0.1  0.5 Tolerances ± 1 % at ± 10 % Typical Temperature Coefficient ± 900 ppm/°C ± 700 ppm/°C ± 250 ppm/°C ± 150 ppm/°C (-55 ° to +155 °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: T 1 P = ------------------------------------------------------------------------------------------- R +R +R TH (j - c) TH (c - h) TH (h - a) P: Expressed in W  RTH (c - h): Thermal resistance value measured between outer side of T: Difference between maximum working temperature and room the resistor and upper side of the heatsink. This is the thermal temperature  resistance of the interface (grease, thermal pad), and the quality of R : Thermal resistance value measured between resistive layer the fastening device. TH (j - c) and outer side of the resistor. It is the thermal resistance of the RTH (h - a): Thermal resistance of the heatsink. component. Example:  R for LTO 50 power rating 10 W at ambient temperature +25 °C TH (c - a) Thermal resistance R : 2.5 °C/W  TH (j - c) Considering equation (1) we have: T = 150 °C - 25 °C = 125 °C  T 125 RTH (j - c) + RTH (c - h) + RTH (h - a) = --P---- = --1---0--- = 12.5 °C/W R + R = 12.5 °C/W - 2.5 °C/W = 10 °C/W TH (c - h) TH (h - a) with a thermal grease R = 1 °C/W, we need a heatsink with R = 9 °C/W. TH (c - h) TH (h - a) Revision: 16-Nov-17 2 Document Number: 50050 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

LTO 50 www.vishay.com Vishay Sfernice OVERLOADS POWER RATING In any case the applied voltage must be lower than the The temperature of the case should be maintained within the maximum overload voltage of 750 V. limits specified.  The values indicated on the graph below are applicable to To improve the thermal conductivity, surfaces in contact resistors in air or mounted onto a heatsink. should be coated with a silicone grease and the torque applied on the screw for tightening should be around 1 Nm. ENERGY CURVE 125 100 S 10 %100 LE N OU R I J E 75 N 1 W Y I PO G D 50 R E NE 0.1 AT E R 25 0.01 10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 0 0 20 40 60 80 100 120 140 150 OVERLOAD DURATION IN s CASE TEMPERATURE IN °C POWER CURVE 1 000 000 PACKAGING Tube of 50 units 100 000 W N MARKING R I 10 000 E Model, style, resistance value (in ), tolerance (in %), W manufacturing date, Vishay Sfernice trademark. O P 1000 100 10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 OVERLOAD DURATION IN s Revision: 16-Nov-17 3 Document Number: 50050 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

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 PACKAGING LEAD (Pb)-FREE optional ± 1 % on request: ± 2 % special TCR, ± 5 % shape etc. ± 10 % GLOBAL PART NUMBER INFORMATION L T O 0 5 0 F 2 7 0 0 0 J T E 3 GLOBAL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING LEAD (Pb)-FREE MODEL LTO 050 F = radial leads The first four digits are F = 1 % T = tube E3 = pure tin significant figures and the G = 2 % last digit specifies the J = 5 % tube 50 pieces number of zeros to follow. K = 10 % R designates decimal point. 48R70 = 48.7  48701 = 48 700  10002 = 100 000  R0100 = 0.01  R4700 = 0.47  27000 = 2700  = 2.7 k RELATED DOCUMENTS APPLICATION NOTES Potentiometers and Trimmers www.vishay.com/doc?51001 Guidelines for Vishay Sfernice Resistive and Inductive Components www.vishay.com/doc?52029 Revision: 16-Nov-17 4 Document Number: 50050 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

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