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| RTO 20 Vishay Sfernice Power Resistors Thick Film Technology FEATURES * * * * * * 20 W at 25 C Heatsink Mounted High Power Dissipation to size ratio Wide Resistance Range from 0.01 to 1 M Negligible Inductance Easy Mounting TO 220 package: Compact and easy to mount RoHS COMPLIANT The well known TO 220 package is compact and easy to mount. Two versions of this thick film resistor are available: * A Radial Leaded version for PCB Mounting * A Flat Lead version for Surface Mounting DIMENSIONS in millimeters RTO 20F - LEADED 4.5 10.1 RTO 20C - FOR SURFACE MOUNTING 4.5 O 3.6 1.3 10.1 O 3.6 1.3 12.5 15 8.8 12.5 15 8.8 13.7 2 3 1.6 0.3 5.08 O 0.8 5.08 * Tolerance unless otherwise specified: 0.4 mm 2.5 * Only for RTO 20 version C = during surface mount soldering temperature profile must not cause the metal tab of this device to exceed 220 C. MECHANICAL SPECIFICATIONS Mechanical Protection Resistive Element Connections Weight Insulated Case Thick Film Tinned copper 2.2 g max. ELECTRICAL SPECIFICATIONS Resistance Range Tolerances (Standard) Dissipation and Associated: Thermal Resistance and Nominal Power 0.010 to 1 M serie E24 1 % to 10 % Onto a heatsink 20 W at + 25 C RTH(j-c): 6.5 C/W free air: 2 W at + 25 C See Performance table 150 ppm/C 250 V 2000 VRMS - 1 min - 10 mA Max (Between Terminals and Heatsink) 106 M 0.1 H 3.12 k DIMENSIONS Standard Package TO 220 Insulated case Temperature Coefficient Standard (- 55 C; + 150 C) Limiting Element Voltage Dielectric Strength MIL STD 202 Insulation Resistance Inductance Critical Resistance ENVIRONMENTAL SPECIFICATIONS Temperature Range Climatic Category Sealing Flammability - 55 C to + 155 C 55/155/56 Sealed container Solder immersion IEC 60695-11-5 2 applications 30 s seperated by 60 s www.vishay.com 14 For technical questions, contact: sfer@vishay.com Document Number: 50005 Revision: 05-Jun-07 RTO 20 Power Resistors Thick Film Technology Vishay Sfernice PERFORMANCE TESTS CONDITIONS EN 60115-1 2 Pr for R < 2 1.6 Pr for R 2 Us < 1.5 UL EN 60115-1/60068-2-14 5 cycles - 55 C to + 155 C EN 60115-1 1000 h Pr at + 25 C EN 60115-1 56 days R.H. 95 % NF EN 140 000 1000 h - 40 % Pr at + 100 C MIL STD 202, Method 204 C Test D MIL STD 202, Method 211 Test A1 IEC 60115-1 IEC 60068-2-27 Saw tooth: 100 g/6 ms TYPICAL DRIFTS Momentary Overload (0.25 % + 0.005 ) Rapid Temperature Change (0.5 % + 0.005 ) Load Life Humidity (Steady State) High Temperature Exposure Vibration Terminal Strength Shock (1 % + 0.005 ) (0.5 % + 0.005 ) (0.5 % + 0.005 ) (0.2 % + 0.005 ) (0.2 % + 0.005 ) (0.5 % + 0.005 ) SPECIAL FEATURES Resistance Values Tolerances Typical Temperature Coefficient Range (- 55 C/+ 155 C) 900 ppm/C 0.01 0.015 1 % at 10 % 700 ppm/C 250 ppm/C 150 ppm/C 0.1 0.5 Note: For very low ohmic values, TCR for information 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: T: RTH: RTH: Example: expressed in W difference between maximum working temperature and room temperature (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) (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. RTH: (c-a) for RTO 20 power rating 10 W at ambient temperature + 25 C Thermal resistance RTH (j-c): 6.5 C/W Considering equation (1) we have: T = 155 C - 25 C = 130 C T 130 R TH (j-c) + R TH (c-a) = ------ = --------- = 13 C/W P 10 R TH (c-a) = 13 C/W - 6.5 C/W = 6.5 C/W Document Number: 50005 Revision: 05-Jun-07 For technical questions, contact: sfer@vishay.com www.vishay.com 15 RTO 20 Vishay Sfernice OVERLOADS 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. Power Resistors Thick Film Technology ENERGY CURVE 100 ENERGY IN JOULES 10 1 0.1 0.01 10-7 10-6 10-5 10-4 10-3 10-2 10-1 OVERLOAD DURATION IN SECONDS POWER RATING CHART 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. Spring clip can also be used to mount the component on an heatsink (ex: Kunze, clip KU4-498). 120 100 % RATED POWER 75 50 25 0 0 20 40 60 80 100 120 140 155 HEATSINK TEMPERATURE IN C MARKING Model, Style, Resistance Value (in ), Tolerance (in %), Manufacturing Date, VISHAY trademark. PACKAGING Tube of 50 units ORDERING INFORMATION RTO MODEL 20 STYLE F CONNECTIONS F: Radial Leads C: Surface Mount U68 RESISTANCE VALUE 5% TOLERANCE 1% 2% 5% 10 % xxx CUSTOM DESIGN Optional on request: special TCR, shape etc. TU50 PACKAGING e3 LEAD (Pb)-FREE SAP PART NUMBERING GUIDELINES RTO MODEL 020 STYLE F CONNECTIONS R6800 RESISTANCE VALUE J TOLERANCE T PACKAGING e3 LEAD (Pb)-FREE www.vishay.com 16 For technical questions, contact: sfer@vishay.com Document Number: 50005 Revision: 05-Jun-07 Legal Disclaimer Notice Vishay Notice Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale. Document Number: 91000 Revision: 08-Apr-05 www.vishay.com 1 |
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