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 Ø 3.6 1.3 Ø 3.6 1.3 15 15 12.5 12.5 8.8 8.8 2 3 13.7 1.6 0.3 5.08 2.5 Ø 0.8 Only for RTO 50 version C = durin g surface mount soldering, the soldering temperature profile must not cause the metal tab of this 5.08 device to exceed 220 °C. MECHANICAL SPECIFICATIONS ELECTRICAL SPECIFICATIONS Mechanical Protection Molded Resistance Range 0.010 Ω to 550 kΩ serie E24 Resistive Element Thick film Tolerances Standard ± 1 % to ± 10 % Connections Tinned copper alloy Dissipation and Associated Onto a heatsink Weight 2.2 g max. 50 W at + 25 °C Thermal Resistance R : 2.6 °C/W DIMENSIONS TH (j - c) and Nominal Power free air: Standard Package TO-220 2.25 W at + 25 °C Insulated case Temperature Coefficient See Performance table Standard (- 55 °C; + 150 °C) ± 150 ppm/°C ENVIRONMENTAL SPECIFICATIONS Limiting Element Voltage U 300 V Temperature Range - 55 °C to + 155 °C L Dielectric Strength 2000 V - 1 min Climatic Category 55/155/156 RMS MIL STD 202 (301) 10 mA max. Sealing Sealed container 6 Insulation Resistance ≥ 10 MΩ Solder immersion Flammability IEC 60695-11-5 Inductance ≤ 0.1 µH 2 applications 30 s Critical Resistance 1.8 kΩ seperated by 60 s Note Not compatible with RoHS reflow profile Document Number: 50035 For technical questions, contact: sfer@vishay.com www.vishay.com Revision: 31-Mar-10 37 RTO 50 50 W Power Resistor, Thick Film Technology, TO-220 Vishay Sfernice PERFORMANCE TESTS CONDITIONS REQUIREMENTS EN 60115-1 2 Pr 5 s for R < 2 Ω Momentary Overload ± (0.25 % + 0.05 Ω) 1.6 Pr 5 s for R ≥ 2 Ω U < 1.5 U S L EN 60115-1 Rapid Temperature Change 60 068-2-14 ± (0.5 % + 0.05 Ω) 5 cycles - 55 °C to + 155 °C EN 60115-1 Load Life ± (1 % + 0.05 Ω) P at + 25 °C, 1000 h CEI 115_1 r EN 60115-1 Humidity (Steady State) ± (0.5 % + 0.05 Ω) 56 days RH 95 % MIL STD 202 Vibration ± (0.2 % + 0.05 Ω) Method 204 C Test D MIL STD 202 Terminal Strength ± (0.2 % + 0.05 Ω) Method 211 Test A1 RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR Resistance Values ≥ 0.01 Ω ≥ 0.015 Ω ≥ 0.1 Ω ≥ 0.5 Ω Tolerances ± 1 % at ± 10 % Temperature Coefficient Standard ± 900 ppm/°C ± 700 ppm/°C ± 250 ppm/°C ± 150 ppm/°C (- 55 °C 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 155 °C. The dissipated power is simply calculated by the following ratio: () 1 ΔT P = ---- ----- ------ ----- ----- ------ ----- ----- ----- ------ ----- - [] + R R TH (j - c) TH (c - a) P: Expressed in W ΔT: 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 TH (j - c) resistance of the component: (Special Features Table) R : Thermal resistance value measured between outer side of the resistor and room temperature. It is the TH (c - a) thermal resistance of the heatsink itself (type, shape) and the quality of the fastening device Example: R : For RTO 50 power rating 13 W at ambient temperature + 30 °C TH (c - a) Thermal resistance R : 26 °C/W TH (j - c) Considering equation (1) we have: ΔT ≤ 155 °C - 30 °C ≤ 125 °C ΔT 125 R + R = --- --- - = --- ----- - - = 9.6 °C/W TH (j - c) TH (c - a) P 13 R ≤ 9 .6 °C/W - 2.6 °C/W ≤ 7 °C/W TH (c - a) www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50035 38 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 The temperature of the heatsink should be maintained within overload voltage of 450 V. the 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 100 100 80 10 60 1 40 0.1 20 0 0.01 0 25 50 100 150 200 -7 -6 -5 -4 -3 -2 -1 10 10 10 10 10 10 10 HEATSINK TEMPERATURE IN °C OVERLOAD DURATION IN s MARKING PACKAGING Model, style, resistance value (in Ω), tolerance (in %), Tube of 50 units manufacturing date, Vishay Sfernice trademark. ORDERING INFORMATION RTO 50 F 100K ± 1% XXX TU50 e1 MODEL STYLE CONNECTIONS RESISTANCE VALUE TOLERANCE CUSTOM DESIGN PACKAGING LEAD (Pb)-FREE F: Radial leads ± 1% Optional C: Surface mount ± 2% on request: ± 5% Special TCR, ± 10% shap, etc. GLOBAL PART NUMBER INFORMATION R T O 05 0 F R 6 80J0T1E GLOBAL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING MODEL RTO 050 F = Radial leads The first four digits are F = 1 % T = Tube C = Surface mount significant figures and the last G = 2 % digit specifies the number of J = 5 % Size 30 and 50: zeros to follow. K = 10 % Tube 50 pieces R designates decimal point. 48R70 = 48.7 Ω 48701 = 48 700 Ω 10002 = 100 000 Ω R0100 = 0.01 Ω R6800 = 0.68 Ω 27000 = 2700 Ω = 2.7 kΩ Document Number: 50035 For technical questions, contact: sfer@vishay.com www.vishay.com Revision: 31-Mar-10 39 ENERGY IN J RATED POWER IN % 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. 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 in any datasheet or in any other disclosure relating to any product. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. 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