PF2270 Series Thin Film Power Resistors • • • • • • • Resistances from 0.1 Ohms to 100K Ohms Power Rating to 600 Watts Resistance Tolerances to ±1% TCR of ±100ppm/C TO-227 (TO-238) Housing Isolated Back Plate Dual Resistor Package Available SPECIFICATIONS Type PF2272 Power Rating (with heatsink) Resistance Range PF2274 PF2276 200 W 300 W 600 W 0.1 to 100K Ohms 0.1 to 100K Ohms 50 to 1K Ohms Resistance Values ( 0.1 to 1 Ohm only available Terminal Z ) E12 ( Plus 2 Ohm and 5 Ohm ) Thermal Resistance 0.5 °C/W 0.32 °C/W Tolerances 0.11 °C/W 5% ( 1% optional ) Temperature Coefficient ±100 ppm/°C Operating Temperature -55°C to 155°C MAX Continuous Voltage √ (P * R) MAX Continuous Current 55A Isolation Voltage 2500VAC Load Life ( 25°C, 90m ON, 30m OFF, 1000hr ) ±1% Humidity ( 40°C, 90-95% RH, DC0.1W, 1000hr ) ±1% Temp. Cycle ( -55°C 30m, 120°C 30m, 20X) ±1% Vibration ( 0.75mm, 100m/s2, 10-54Hz, 10X, XYZ ) ±0.25% Insulation Resistance > 1000 MegOhm Recommended Mounting Torques Terminals: 0.6 Nm Backplate: 1.0Nm Dimension mm (±mm) inches (±inches) A 38.0 0.2 1.50 0.008 B 25.0 0.2 0.98 0.008 C 11.8 0.5 0.47 0.020 D 4.2 0.1 0.165 0.008 E 13.0 0.3 0.512 0.012 F 15.0 0.4 0.591 0.016 G 30.0 0.1 1.181 0.004 H 10.0 0.2 0.394 0.008 Ordering Information Part Number - Terminal Style - Resistance - Tolerance PF2274X 10 Ohms 5% 4T Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 12/10a PF2270 Series Thin Film Power Resistors SPECIFICATIONS (continued) Available Terminal Styles 4 3 4 3 4 3 1 2 1 2 1 2 Style X Style Z Style Y Standard Note: Style Z is not a true 4-terminal measurement Current can be applied to any pins Power Derating Curve 120 Power ( % ) 100 80 60 40 20 0 0 25 50 75 100 125 150 175 200 Ambient Temperature (°C) Power Rating Notes The PF2270 Series Foil Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 155°C. To specify an appropriate heatsink use the following formula : RθH = TMAX - ( P x RθR ) - TA P Where: Riedon Inc. RθH = Thermal Resistance of Heatsink ( K/W ) RθR = Thermal Resistance of Resistor ( K/W ) TMAX = Maximum Temperature of Resistor TA = Ambient Temperature of Heatsink ( °C ) P = Power Through Resistor ( W ) 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 12/10a