V I S H AY I N T E R T E C H N O L O G Y, I N C . LTO 3 0, LTO 50, LTO 10 0 KEY BENEFITS * Standard TO-220 and TO-247 packages * Non-inductive * Compact, low-profile 3.2 mm thickness * Wide resistance range; low values available from R01 in 1 % tolerance * Compliant to RoHS directive 2002/95/EC * Direct mounting of exposed ceramic on heatsink APPLICATIONS w w w. v i s h a y. c o m * Power conversion * High-speed switching * RF applications * Current sensing Datasheet is available on our web site at www.vishay.com for LTO 30 - http://www.vishay.com/doc?50049 for LTO 50 - http://www.vishay.com/doc?50050 for LTO 100 - http://www.vishay.com/doc?50051 PRODUCT SHEET 30 W, 50 W, and 100 W Thick Film Power Resistor RESISTIVE PRODUCTS THICK FILM POWER RESISTOR 5.08 0.8 1.3 3.2 3.5 TO-220, TO-247 isolated case 5.33 3.5 5.0 2.4 0.6 Onto a heatsink Document Number: 50049 Revision: 29-Jul-09 2.08 k, 1.25 k, 1.41 k 0.1 H Critical Resistance 104 M Inductance 1500 VRMS - 1 min 10 mA max. 250 V, 375 V (for LTO 100) 150 ppm/C 150ppm/C, 250 ppm/C, 700 ppm/C, 900 ppm/C Insulation Resistance Dielectric Strength MIL STD 202 Limiting Element Voltage UL Standard Temperature Coefficient Power Rating and Thermal Resistance of the Component 1 % to 10 % Dissipation and Associated 30 W, 50 W, and 100 W at + 25 C (case temp.) RTH (j - c): 4.2 C/W, 2.5 C/W, 1.5 C/W Free air: 2.25 W, 2.5 W, 3.5 W at + 25 C 0.010 to 1 M Tolerances (Standard) 14.5 20.7 Resistance Range For technical questions, contact: sfer@vishay.com - 55 C to + 155 C (- 55 C to + 175 C for LTO 100) 55/155/56 IEC 60695-11-5 2 applications 30 s separated by 60 s 10.16 15.76 ELECTRICAL SPECIFICATIONS 1.5 3.6 O 3.6 LTO 100 * Compliant to RoHS directive 2002/95/EC * TO-220 and TO-247 package: Compact and easy to mount * Non-inductive * Broad resistance range: 0.010 to 1 M * Direct mounting ceramic on heatsink * 30 W, 50 W, and 100 W at 25 C case temperature heatsink mounted FEATURE 10-5 10-4 10-3 0 0 (1) T P = ----------------------------------------------------------[ R TH (j - c) + R TH (c - a) ] 10-1 25 50 75 100 125 25 For technical questions, contact sfer@vishay.com 75 100 125 CASE TEMPERATURE IN C 50 LTO 30, LTO 50 150 LTO 100 LTO GLOBAL MODEL L 030 050 100 SIZE T O 3 F = Radial leads LEADS 0 0 2 7 OHMIC VALUE F 0 0 F=1% G=2% J=5% K = 10 % TOLERANCE 0 T Tube 30 pieces (50 pieces for LTO 100) T = Tube PACKAGING J E E3 = Pure tin 75 LEAD (Pb)-FREE 3 VMN-PT9158-1007 www.vishay.com Build Vishay into your Design 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 GLOBAL PART NUMBER INFORMATION with a thermal grease RTH (c - h) = 1 C/W, we need a heatsink with RTH (h - a) = 7.3 C/W. 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 - a): Thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal resistance of the heatsink itself (type, shape) and the quality of the fastening device, and the thermal resistance of the thermal compound. 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 175 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. POWER RATING Vishay Sfernice 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: 10-2 LTO 30, LTO 50 LTO 100 OVERLOAD DURATION IN s CHOICE OF THE HEATSINK 0.01 10-6 0.1 1 10 100 ENERGY CURVE In any case the applied voltage must be lower than the maximum overload voltage of 375 V (560 V for LTO 100). The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. OVERLOADS Document Number: 50049 For technical questions, contact: sfer@vishay.com Revision: 29-Jul-09 DISCLAIMER All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. 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. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. www.vishay.com 74 Climatic Category Flammability Temperature Range 12.7 16.2 Molded Thick film Alumina Tinned copper 2 g max. (3.5 gfor LTO 100) 1 Nm 1.8 0.6 ENVIRONMENTAL SPECIFICATIONS Standard Package DIMENSIONS Mechanical Protection Resistive Element Substrate Connections Weight Mounting Torqure MECHANICAL SPECIFICATIONS Note * Tolerances unless stated: 0.3 mm O 3.2 10.4 LTO 30, LTO 50 3.2 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 30 W Power Resistor Thick Film Technology Vishay Sfernice LTO 30, LTO 50, LTO 100 30 W, 50 W, and 100 W Power Resistor Thick Film Technology Revision 29-Jul-09 30 W Power Resistor Thick Film Technology ENERGY IN J Vishay Sfernice LTO 30, LTO 50, LTO 100 LTO 30, LTO 50, LTO 100 RATED POWER IN %