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RH0054R125FC02 Datasheet(PDF) 3 Page - Vishay Siliconix |
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RH0054R125FC02 Datasheet(HTML) 3 Page - Vishay Siliconix |
3 / 5 page RH, NH www.vishay.com Vishay Dale Revision: 22-Jun-12 3 Document Number: 30201 For technical questions, contact: ww2bresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 POWER RATING Vishay RH resistor wattage ratings are based on mounting to the following heat sink: RH005 and RH010: 4" x 6" x 2" x 0.040" thick aluminum chassis (129 sq. in. surface area) RH025: 5" x 7" x 2" x 0.040" thick aluminum chassis (167 sq. in. surface area) RH050: 12" x 12" x 0.059" thick aluminum panel (291 sq. in. surface area) RH100 and RH250: 12" x 12" x 0.125" thick aluminum panel (294 sq. in. surface area) AMBIENT TEMPERATURE DERATING Derating is required for ambient temperatures above 25 °C, see the following graph. Curves A, B, C apply to operation of unmounted resistors. Curve D applies to all types when mounted to specified heat sink. A = RH005 and RH010 size resistor, unmounted B = RH025 size resistor, unmounted C = RH050, RH100 and RH250 size resistor, unmounted D = All types mounted to recommended aluminum heat sink REDUCED HEAT SINK DERATING Derating is also required when recommended heat sink area is reduced. A = RH005 and RH010 size resistor B = RH025 size resistor C = RH050, RH100 and RH250 size resistor FREE AIR POWER RATING GLOBAL MODEL RH005 NH005 RH010 NH010 RH025 NH025 RH050 NH050 RH100 NH100 RH250 NH250 W at 25 °C 4.5 7.5 12.5 20 40 100 AMBIENT TEMPERATURE IN °C 25 120 A C D B 0 20 40 60 80 100 - 55 - 50 0 50 150 250 0 100 80 60 40 20 0 100 90 80 70 60 50 40 30 20 10 % OF RECOMMENDED HEAT SINK AREA C B A |
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