LTO 30 Vishay Sfernice 30 W Power Resistor Thick Film Technology FEATURE 30 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 Compliant to RoHS directive 2002/95/EC 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 O 3.2 1.3 0.8 5.08 3.5 12.7 0.6 1.8 Note * Tolerances unless stated: 0.3 mm MECHANICAL SPECIFICATIONS Mechanical Protection Resistive Element Substrate Connections Weight Mounting Torqure Molded Thick film Alumina Tinned copper 2 g max. 1 Nm DIMENSIONS Standard Package TO220 package ELECTRICAL SPECIFICATIONS Resistance Range Tolerances (Standard) 1 % to 10 % Dissipation and Associated Onto a heatsink Power Rating and Thermal Resistance of the Component Temperature Coefficient Standard ENVIRONMENTAL SPECIFICATIONS Limiting Element Voltage UL Temperature Range Climatic Category Flammability Dielectric Strength MIL STD 202 www.vishay.com 74 - 55 C to + 155 C 55/155/56 IEC 60695-11-5 2 applications 30 s separated by 60 s 0.010 to 550 k 30 W at + 25 C (case temp.) RTH (j - c): 4.2 C/W Free air: 2.25 W at + 25 C See Performance table 150 ppm/C 250 V 1500 VRMS - 1 min 10 mA max. Insulation Resistance 104 M Inductance 0.1 H Critical Resistance 2.08 k For technical questions, contact: sfer@vishay.com Document Number: 50049 Revision: 21-Jan-11 LTO 30 30 W Power Resistor Thick Film Technology 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 0.1 0.5 250 ppm/C 150 ppm/C 1 % at 10 % Typical Temperature Coefficient (- 55 to + 155 C) 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 - a) RTH (c - a):Thermal resistance value measured between outer side of P: Expressed in W the resistor and room temperature. It is the thermal T: Difference between maximum working temperature and room resistance of the heatsink itself (type, shape) and the quality of the temperature fastening device, and the thermal resistance of the thermal RTH (j - c):Thermal resistance value measured between resistive layer compound. and outer side of the resistor. It is the thermal resistance of the component. Example: RTH (c - a) for LTO 30 power rating 10 W at ambient temperature + 25 C Thermal resistance RTH (j - c): 4.2 C/W Considering equation (1) we have: T = 150 C - 25 C = 125 C T 125 RTH (j - c) + RTH (c - a) = ------- = ---------- = 12.5 C/W P 10 RTH (c - a) = 12.5 C/W - 4.2 C/W = 8.3 C/W with a thermal grease RTH (c - h) = 1 C/W, we need a heatsink with RTH (h - a) = 7.3 C/W. Document Number: 50049 Revision: 21-Jan-11 For technical questions, contact: sfer@vishay.com www.vishay.com 75 LTO 30 30 W Power Resistor Thick Film Technology Vishay Sfernice OVERLOADS POWER RATING In any case the applied voltage must be lower than the maximum overload voltage of 375 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 125 100 RATED POWER IN % 100 ENERGY IN J 10 1 0.1 75 50 25 0 0.01 -6 10 10-5 10-4 10-3 10-2 0 20 40 60 80 100 120 140 150 CASE TEMPERATURE IN C OVERLOAD DURATION IN s MARKING PACKAGING Model, style, resistance value (in ), tolerance (in %), manufacturing date, Vishay Sfernice trademark. Tube of 50 units ORDERING INFORMATION LTO 30 F 2.7 k 1% xxx TU50 e3 MODEL STYLE CONNECTIONS RESISTANCE VALUE TOLERANCE CUSTOM DESIGN PACKAGING LEAD (Pb)-FREE 1% 2% 5% 10 % Optional on request: Special TCR, shape etc. GLOBAL PART NUMBER INFORMATION L T O 0 3 0 F 2 7 0 0 0 J T E 3 GLOBAL MODEL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING LEAD (Pb)-FREE LTO 030 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. F=1% G=2% J=5% K = 10 % T = Tube E3 = Pure tin Tube 50 pieces 48R70 = 48.7 48701 = 48 700 10002 = 100 000 R0100 = 0.01 R4700 = 0.47 27000 = 2700 = 2.7 k www.vishay.com 76 For technical questions, contact: sfer@vishay.com Document Number: 50049 Revision: 21-Jan-11 Legal Disclaimer Notice Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. 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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. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 11-Mar-11 www.vishay.com 1