RTO 50 Vishay Sfernice 50 W Power Resistor, Thick Film Technology, TO-220 FEATURE * 50 W at 25 C heatsink mounted * Adjusted by sand trimming * Leaded or surface mount versions * High power to size ratio * Non inductive element * Compliant to RoHS directive 2002/95/EC Because of the knowledge and experience in Thick Film technology, Vishay Sfernice has been able to develop a high power resistor in a TO-220 package called RTO 50. The special design of this component allows the dissipation of 50 W when mounted on a heatsink. The ohmic value is adjusted by sand trimming. This process does not generate hot spots as in laser trimming, which could lead to microcracks on each side of the curve. This process improves the reliability and the stability of the resistor and at the same time gives a good overload capability. DIMENSIONS in millimeters RTO 50F - LEADED RTO 50C - FOR SURFACE MOUNTING 4.5 4.5 10.1 10.1 1.3 O 3.6 15 12.5 O 3.6 12.5 8.8 1.3 15 8.8 2 3 13.7 0.3 1.6 5.08 2.5 O 0.8 * Only for RTO 50 version C = during surface mount soldering, the soldering temperature profile must not cause the metal tab of this device to exceed 220 C. 5.08 MECHANICAL SPECIFICATIONS Mechanical Protection Resistive Element Connections Weight Molded Thick film Tinned copper alloy 2.2 g max. DIMENSIONS Standard Package TO-220 Insulated case ENVIRONMENTAL SPECIFICATIONS Temperature Range Climatic Category Sealing Flammability - 55 C to + 155 C 55/155/156 Sealed container Solder immersion IEC 60695-11-5 2 applications 30 s seperated by 60 s ELECTRICAL SPECIFICATIONS Resistance Range Tolerances Standard Dissipation and Associated Thermal Resistance and Nominal Power Temperature Coefficient Standard (- 55 C; + 150 C) Limiting Element Voltage UL Dielectric Strength MIL STD 202 (301) 0.010 to 550 k serie E24 1 % to 10 % Onto a heatsink 50 W at + 25 C RTH (j - c): 2.6 C/W free air: 2.25 W at + 25 C See Performance table 150 ppm/C 300 V 2000 VRMS - 1 min 10 mA max. Insulation Resistance 106 M Inductance 0.1 H Critical Resistance 1.8 k Note * Not compatible with RoHS reflow profile Document Number: 50035 Revision: 31-Mar-10 For technical questions, contact: sfer@vishay.com www.vishay.com 37 RTO 50 Vishay Sfernice 50 W Power Resistor, Thick Film Technology, TO-220 PERFORMANCE TESTS CONDITIONS REQUIREMENTS EN 60115-1 2 Pr 5 s for R < 2 1.6 Pr 5 s for R 2 US < 1.5 UL (0.25 % + 0.05 ) EN 60115-1 60 068-2-14 5 cycles - 55 C to + 155 C (0.5 % + 0.05 ) EN 60115-1 Pr at + 25 C, 1000 h CEI 115_1 (1 % + 0.05 ) EN 60115-1 56 days RH 95 % (0.5 % + 0.05 ) Vibration MIL STD 202 Method 204 C Test D (0.2 % + 0.05 ) Terminal Strength MIL STD 202 Method 211 Test A1 (0.2 % + 0.05 ) Momentary Overload Rapid Temperature Change Load Life Humidity (Steady State) RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR 0.01 Resistance Values 0.015 Tolerances 0.1 0.5 250 ppm/C 150 ppm/C 1 % at 10 % Temperature Coefficient (- 55 C to + 155 C) Standard 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 155 C. The dissipated power is simply calculated by the following ratio: (1) T P = ---------------------------------------------------------[ R TH (j - c) + R TH (c - 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: (Special Features Table) 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 Example: RTH (c - a): For RTO 50 power rating 13 W at ambient temperature + 30 C Thermal resistance RTH (j - c): 26 C/W Considering equation (1) we have: T 155 C - 30 C 125 C T 125 RTH (j - c) + RTH (c - a) = ------- = ---------- = 9.6 C/W P 13 RTH (c - a) 9 .6 C/W - 2.6 C/W 7 C/W www.vishay.com 38 For technical questions, contact: sfer@vishay.com Document Number: 50035 Revision: 31-Mar-10 RTO 50 50 W Power Resistor, Thick Film Technology, TO-220 Vishay Sfernice OVERLOADS POWER RATING The applied voltage must always be lower than the maximum overload voltage of 450 V. The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. The temperature of the heatsink 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 100 10 RATED POWER IN % ENERGY IN J 100 1 0.1 0.01 10-7 80 60 40 20 0 10-6 10-5 10-4 10-3 10-2 10-1 0 25 50 100 150 200 HEATSINK 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 RTO 50 F 100K 1% XXX MODEL STYLE CONNECTIONS RESISTANCE VALUE TOLERANCE CUSTOM DESIGN 1% 2% 5% 10% Optional on request: Special TCR, shap, etc. F: Radial leads C: Surface mount TU50 e1 PACKAGING LEAD (Pb)-FREE GLOBAL PART NUMBER INFORMATION R T O 0 5 0 F R 6 8 0 0 J T E 1 GLOBAL MODEL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING RTO 050 F = Radial leads C = Surface mount 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 Size 30 and 50: Tube 50 pieces 48R70 = 48.7 48701 = 48 700 10002 = 100 000 R0100 = 0.01 R6800 = 0.68 27000 = 2700 = 2.7 k Document Number: 50035 Revision: 31-Mar-10 For technical questions, contact: sfer@vishay.com www.vishay.com 39 Legal Disclaimer Notice Vishay 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. Document Number: 91000 Revision: 18-Jul-08 www.vishay.com 1