RTOP Vishay Sfernice Power Resistor for Mounting onto a Heatsink Thick Film Technology FEATURES * 1 % tolerance available * High power rating = 200 W * Wide ohmic value range = 0.046 to 1 M * Non inductive * Easy mounting * Low thermal radiation of the case * Standard Isotop case (SOT-227 B) * Compliant to RoHS directive 2002/95/EC This series of thick film power resistors include modules which can incorporate up to 2 different resistor values in the same SOT-227B package. Two types of terminations are available along with a 4 terminal device for measurement applications in the case of the single resistor version. This product range benefits from Vishay Sfernice's experience in thick film power resistor technology i.e. high power: volume ratio, low tolerance or individual resistors and excellent overload capabilities (due to the trimming technique). DIMENSIONS in millimeters RTOP V Connections 10 12.6 4 16 12.6 25 30 38 O 4.2 Note * Tolerances unless otherwise specified: 0.3 mm MECHANICAL SPECIFICATIONS Mechanical Protection Substrate Resistive Element End Connections Tightening Torque Connections Tightening Torque Heatsink Weight Insulated case Alumina on insulated base Cermet V connections: screw M4 x 6 1 Nm 2 Nm 30 g max. ELECTRICAL SPECIFICATIONS Resistance Range 0.046 to 1 M Standard Tolerance 1 % to 10 % Power Rating 50 W to 200 W at + 25 C Temperature Coefficient Standard (- 55 C to + 125 C) 300 ppm/C (R < 1) 150 ppm/C (R > 1) ENVIRONMENTAL SPECIFICATIONS Temperature Range Climatic Category Document Number: 50045 Revision: 29-Jul-09 - 55 C to + 125 C 55/125/56 Insulation Resistance For technical questions, contact: sfer@vishay.com > 106 M www.vishay.com 51 RTOP Vishay Sfernice Power Resistor for Mounting onto a Heatsink Thick Film Technology PERFORMANCE TESTS CONDITIONS REQUIREMENTS IEC 60115-1 2.5 Pn/5 s US < 2 UL < (0.25 % + 0.05 ) IEC 60115-1 5 cycles - 55 C + 125 C < (0.25 % + 0.05 ) IEC 60115-1 Pn at 25 C 1000 h < (0.5 % + 0.05 ) IEC 60115-1/IEC 60068-2-3 Test Ca 56 days 95 % R.H./40 C < (0.5 % + 0.05 ) Momentary Overload Rapid Temperature Change Load Life Humidity (Steady State) SPECIAL FEATURES MODEL Power Rating at + 25 C Chassis Mounted Resistors Unmounted Resistors Thermal Resistance (Per Resistor) Limiting Voltage UL Dielectric Strength (1) Connections/Chassis Dielectric Strength (1) Connections/Resistors RTOP 200 RTOP 100 DRTOP 100 DRTOP 50 200 W 5W 100 W 5W 100 W 3.5 W 50 W 3.5 W 0.5 C/W 1 C/W 0.5 C/W 1 C/W 1500 V 1500 V 500 V 500 V 2500 V, 1 min 10 mA max. 2500 V, 1 min 10 mA max. 2500 V, 1 min 10 mA max. 2500 V, 1 min 10 mA max. - - 2500 V, 1 min 10 mA max. 2500 V, 1 min 10 mA max. Ohmic Value Range 0.046 to 1 M 0.092 to 1 M Tolerance 1 % to 10 % 1 % to 10 % R R2 R1 Electrical Diagrams R Shunt Version Note (1) MIL STD 202 Method 301 www.vishay.com 52 For technical questions, contact: sfer@vishay.com Document Number: 50045 Revision: 29-Jul-09 RTOP Power Resistor for Mounting onto a Heatsink Thick Film Technology Vishay Sfernice RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK * Surfaces in contact must be carefully cleaned. * The heatsink must have an acceptable flatness: From 0.05 mm to 0.1 mm/100 mm. * Roughness of the heatsink must be around 6.3 m. In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) should be coated with a silicone grease (type SI 340 from Rhone-Poulenc or Dow 340 from Dow Corning). RTOP Tightening Torque on Heatsink 2 Nm * For the electrical connections, it is recommended to use M4 x 6 screws and if necessary a washer of 1mm thickness. The recommended screw tightening torque is 1 Nm. CHOICE OF THE HEATSINK The user must choose the heatsink according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 125 C. The dissipated power is simply calculated by the following ratio: 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 (see Table Special Features). RTH (c - a): Thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal resistance of the heatsink depending on the heatsink itself (type, shape) and the quality of the fastening device. Example: RTH (c - a): For RTOP 200 power rating 130 W at ambient temperature + 30 C. Thermal resistance (see table 1) RTH (j - c): 0.5 C/W T 125 C - 30 C - 95 C T 95 R TH (j - c) + R TH (c - a) = ------- = ---------- = 0.73 C/W P 130 R TH (j - c) 0.5 C/W R TH (c - a) 0.73 C/W - 0.5 C/W 0.23 C/W Document Number: 50045 Revision: 29-Jul-09 For technical questions, contact: sfer@vishay.com www.vishay.com 53 RTOP Power Resistor for Mounting onto a Heatsink Thick Film Technology Vishay Sfernice OVERLOADS POWER RATING The applied power is 2.5 x rated power for 5 s with a max. voltage of 2 x nominal voltage. Accidental overload: The values indicated in the graph below are applicable to resistors in air or mounted onto a heatsink. In case of multi-resistor devices, (DRTOP, TROP and QROP) the results apply to each resistor value in the device. The temperature of the heater should be maintained in the limit specified. To improve the thermal conductivity, surfaces in contact should be laid on with a silicon grease and the torque applied on the screw for tightening should be around 2 Nm. ENERGY CURVE 1000 100 RATED POWER IN % ENERGY IN J 100 10 1 0.1 0.01 80 60 40 20 10-6 10-7 10-5 10-4 10-3 10-2 10-1 0 1 0 20 OVERLOAD DURATION IN s 40 60 80 100 120 140 HEATSINK TEMPERATURE IN C DRTOP RTOP MARKING Series, style, ohmic value (in), tolerance manufacturing date, Vishay Sfernice trademark. (in PACKAGING %), Box of 10 units ORDERING INFORMATION RTOP 200 5U DRTOP 50 150U 1% % 5% 15U 5% R1 MODEL STYLE RTOP DRTOP 100 50 OHMIC VALUE V T1 ABSOLUTE TOLERANCE PER RESISTOR Optional 1% 2% 5% 10 % V XXX BO10 e CONNECTIONS CUSTOM DESIGN PACKAGING LEAD (Pb)-FREE V: Screw VS: RTOP Shunt Optional R2 To be precise for each resistor GLOBAL PART NUMBER INFORMATION R GLOBAL MODEL RTOP www.vishay.com 54 T O P 1 0 0 V 5 R 0 0 K B SIZE LEADS OHMIC VALUE TOL. PACKAGING SPECIAL 100 200 V = Screw VS = RTOP Shunt The first three digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point. 48R7 = 48.7 4871 = 4870 1002 = 10 000 R010 = 0.01 R680 = 0.68 2701 = 2.7 k F=1% G=2% J=5% K = 10 % B = Box 10 pieces As applicable Ex = UA1 For technical questions, contact: sfer@vishay.com Document Number: 50045 Revision: 29-Jul-09 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. 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