Power Resistor 25W 5% 2,2R

GROUP:C1492Gruppe: C1492VISHAY Power Thick Film ResistorsSeries: RCH25Power: 25WTolerance: 5%Features• 25W at heatsink mounted (optional)• Compact size• Easy mounting• High insulation: 106MWTechnical SpecificationsTolerance:±5%Power RatingWithout Heatsink:4WWith Heatsink1):25WOperating Voltage, Max.:550VDielectric Strength:3500VTemperature Coefficient<1W:±250ppm/°C>1W:±150ppm/°CThermal Resistance:1,4°C/WTemperature Range:-55...+125°CClimatic Category:55/125/56Derating:See Curve1) For calculation of heatsink please see values below NoteNote• You will find suitable heatsinks at product group G9511.Calculation of heatsinkP = DT / [RTH(j-c) + RTH(c-a)]P = Expressed in WDT = Difference between maximum working temperature (125°C) and room temperatureRTH(j-c) = Thermal resistance of the componentRTH(c-a) = Thermal resistance of the heatsink and quality of fastening deviceExample:Ambient Temperature 50°C, Power Rating: 20W1) P = DT / [RTH(j-c) + RTH (c-a)]2) DT = 125°C - 50°C = 75 K3) [RTH(j-c) + RTH (c-a)] = DT / P = 75K / 20W = 3,75K/W4) RTH (c-a) = 3,75K/W - 1,4K/W = 2,35K/WTerms of DeliveryMinimum order quantity: 1 PKU = 2 piecesManufacturer http://www.vishay.com

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