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| RTOP Vishay Sfernice Power Resistors for Mounting onto a Heatsink Thick Film Technology FEATURES * 1% tolerance available * High power rating * Wide ohmic value range * Non inductive * Easy mounting * Low thermal radiation of the case * Standard Isotop case (SOT 227 B) 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 * Tolerances unless otherwise specified: 0.3mm MECHANICAL SPECIFICATIONS Mechanical Protection Substrate Resistive Element End Connection Tightening Torque Connections Tightening Torque Heatsink Insulated case Alumina on insulated base Cermet V connections: screw M4 x 6 1 Nm 2 Nm ELECTRICAL SPECIFICATIONS Resistance Range Standard Tolerance Power Rating Temperature Coefficient Standard 300 ppm/C (R < 1) 150 ppm/C (R > 1) > 106M 0.046 to 1M 1% to 10% 50W to 200W at + 25C ENVIRONMENTAL SPECIFICATIONS Temperature Range Climatic Category - 55C to + 125C 55/125/56 Insulation Resistance Document Number: 50045 Revision 14-Jan-04 For technical questions, contact sfer@vishay.com www.vishay.com 27 RTOP Vishay Sfernice PERFORMANCE TESTS Momentary Overload Rapid Temperature Change Load Life Humidity (steady state) CONDITIONS NF EN 140000 CEI 115_1 2.5Pn/5 seconds NF EN 140000 CEI 68214 Test Na 5 cycles - 55C +125C NF EN 140000 CEI 115_1 Pn at 25C 1000 hours MIL STD 202 Method 103 B Test D 56 days 95% R.H. TYPICAL DRIFTS < (0.25% + 0.05) < (0.25% + 0.05) < (0.5% + 0.05) < (0.5% + 0.05) Power Resistors for Mounting onto a Heatsink Thick Film Technology SPECIAL FEATURES MODEL Power Rating at + 25C chassis mounted resistors unmounted resistors Thermal Resistance (per resistor) Limiting Voltage Dielectric Strength* connections/chassis Dielectric Strength* connections/resistors Ohmic Value Range Tolerance Electrical Diagrams R2 R1 RTOP 200 RTOP 100 DRTOP 100 DRTOP 50 200W 5W 0.5C/W 1500V 2500V, 1 Minute 10mA Max - 100W 5W 1C/W 1500V 2500V, 1 Minute 10mA Max - 100W 3.5W 0.5C/W 500V 2500V, 1 Minute 10mA Max 2500V, 1 Minute 10mA Max 50W 3.5W 1C/W 500V 2500V, 1 Minute 10mA Max 2500V, 1 Minute 10mA Max 0.046 to 1M 1% to 10% 0.092 to 1M 1% to 10% R R Shunt Version *MIL STD 202 Method 301 www.vishay.com 28 For technical questions, contact sfer@vishay.com Document Number: 50045 Revision 14-Jan-05 RTOP Power Resistors for Mounting onto a Heatsink Thick Film Technology CHOICE OF HEATSINK The user must choose the heatsink according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 125C. The dissipated power is simply calculated by the following ratio: T [RTH (j-c) + RTH (c-a)] (1) Vishay Sfernice P= P: T: RTH: RTH: 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 (see Table Special Features). (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 130W at ambient temperature + 30C. Thermal resistance (see table 1) RTH (j-c): 0.5C/W T 125C - 30C - 95C 95 T RTH (j-c) + RTH (c-a) = = = 0.73C/W P 130 RTH (j-c) 0.5C/W RTH (c-a) 0.73C/W - 0.5C/W 0.23C/W RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK Surfaces in contact must be carefully cleaned. The heatsink must have an acceptable flatness: from 0.05mm to 0.1mm/100mm. Roughness of the heater must be around 6.3m. In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) are laid on with a silicone grease (type SI 340 from Rhone-Poulenc or Dow 340 from Dow Corning). Tightening torque on heater: 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. Document Number: 50045 Revision 14-Jan-04 For technical questions, contact sfer@vishay.com www.vishay.com 29 RTOP Vishay Sfernice OVERLOADS 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. Power Resistors for Mounting onto a Heatsink Thick Film Technology ENERGY CURVE 1000 100 ENERGY IN JOULES 10 1 0.1 0.01 1.10-7 1.10-6 1.10-5 1.10-4 1.10-3 1.10-2 1.10-1 1 OVERLOAD DURATION IN SECONDS RTOP DRTOP POWER RATING CHART 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. 100 80 % RATED POWER 60 40 20 0 0 20 40 60 80 100 120 140 HEATSINK TEMPERATURE IN DEGREES CELSIUS MARKING Series, style, ohmic value (in ), tolerance (in %), manufacturing date, VISHAY trade mark. ORDERING INFORMATION RTOP 200 3.2 1% R1 MODEL RTOP DRTOP STYLE 100 50 OHMIC VALUE T1 % R2 CONNECTIONS V: Screw VS: RTOP Shunt CUSTOM DESIGN Optional V ABSOLUTE TOLERANCE PER RESISTOR Optional 1% 2% 5% 10 % To be precise for each resistor www.vishay.com 30 For technical questions, contact sfer@vishay.com Document Number: 50045 Revision 14-Jan-05 |
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