LTO 100 www.vishay.com Vishay Sfernice Power Resistor Thick Film Technology FEATURES 100 W at 25 C case temperature heatsink mounted Direct mounting ceramic on heatsink Broad resistance range: 0.015 to 1 M Non inductive TO-247 package: compact and easy to mount AEC-Q200 qualified DESIGN SUPPORT TOOLS click logo to get started Material categorization: for definitions of compliance please see www.vishay.com/doc 99912 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 5.0 15.76 5.33 20.7 3.6 3.6 3.5 14.5 1.5 0.6 2.4 10.16 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 100 TO-247 0.015 to 1 M 100 500 1, 2, 5, 10 200, 350, 900 2.5 K MECHANICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS Mechanical Protection Molded Dissipation and Associated Onto a heatsink Resistive Element Thick film 100 W at +25 C (case temp.) Power Rating and R : 1.5 C/W TH (j - c) Substrate Alumina Thermal Resistance Free air: of the Component Connections Tinned copper 3.5 W at +25 C Weight 3.5 g max. See Performance table Temperature Coefficient 150 ppm/C Mounting Torqure 1 Nm Dielectric Strength 3000 V - 1 min RMS MIL STD 202 10 mA max. ENVIRONMENTAL SPECIFICATIONS 4 Temperature Range -55 C to +175 C Insulation Resistance 10 M Inductance 0.1 H Climatic Category 55 / 175 / 56 IEC 60695-11-5 Flammability 2 applications 30 s separated by 60 s Revision: 16-Nov-17 Document Number: 50051 1 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 100 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 Load Life (1 % + 0.005 ) 1000 h Pr at +25 C AEC-Q200 REV D conditions: MIL-STD-202 method 108 High Temperature Exposure (0.25 % + 0.005 ) 1000 h, +175 C, unpowered AEC-Q200 REV D conditions: JESD22 method JA-104 Temperature Cycling (1 % + 0.005 ) 1000 cycles, -55 C to +125 C dwell time -15 min AEC-Q200 REV D conditions: Biased Humidity MIL-STD-202 method 103 (1 % +0.005 ) 1000 h, 85 C, 85 % RH AEC-Q200 REV D conditions: Operational Life MIL-STD-202 method 108 (1 % +0.005 ) 2000 h, 90/30, powered, +125 C AEC-Q200 REV D conditions: ESD Human Body Model AEC-Q200-002 (0.5 % +0.005 ) 25 kV AD AEC-Q200 REV D conditions: MIL-STD-202 method 204 Vibration (0.5 % +0.005 ) 5 gs for 20 min, 12 cycles test from 10 Hz to 2000 Hz AEC-Q200 REV D conditions: MIL-STD-202 method 213 Mechanical Shock (0.5 % +0.005 ) 100 gs, 6 ms, 3.75 m/s 3 shocks/direction AEC-Q200 REV D conditions: Terminal Strength AEC-Q200-006 (0.25 % +0.01 ) 2 kgf, 60 sec SPECIAL FEATURES Resistance Values 0.015 0.1 > 20 Tolerances 1 % at 10 % Typical Temperature Coefficient 900 ppm/C 350 ppm/C 200 ppm/C (-55 to +175 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 175 C. The dissipated power is simply calculated by the following ratio: 1 T P = ----------------------------------------------------------------------------------- R ++R R TH (j - c) TH (c - h) TH (h - a) P: Expressed in W T: Difference between maximum working temperature and room temperature R : Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the TH (j - c) component. R : Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. This is the thermal resistance TH (c - h) of the interface (grease, thermal pad), and the quality of the fastening device. R : Thermal resistance of the heatsink. TH (h - a) Example: R + R for LTO 100 power rating 10 W at ambient temperature +25 C TH (c - h) TH (h - a) Thermal resistance R : 1.5 C/W TH (j - c) (1) Considering equation we have: T = 175 C - 25 C = 150 C T 150 R + R + R = ------- = ----------- = 15 C/W TH (j - c) TH (c - h) TH (h - a) P 10 R + R = 15 C/W - 1.5 C/W = 13.5 C/W TH (c - h) TH (h - a) with a thermal grease R = 1 C/W, we need a heatsink with R = 12.5 C/W. TH (c - h) TH (h - a) Revision: 16-Nov-17 Document Number: 50051 2 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