riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 5/13 specifications ? 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 ? m4x5mm screws included ? isolated back plate thin & thick film power resistors type pf2272 pf2274 pf2276 power rating (with heatsink) 200 w 300 w 600 w resistance range 0.1 to 100k ohms 0.1 to 100k ohms ( 0.1 to 1 ohm only available terminal z ) 50 to 1k ohms resistance values e12 ( plus 2 ohm and 5 ohm ) thermal resistance 0.5 c/w 0.32 c/w 0.11 c/w tolerances 5% ( 1% optional ) temperature coeffcient 100 ppm/c operating temperature -55c to 155c max continuous voltage (p * r) max continuous current 55a isolation voltage 2500vac load life ( 25c, 90m on, 30m off, 1000hr ) 1% humidity ( 40c, 90-95% rh, dc0.1w, 1000hr ) 1% temp. cycle ( -55c 30m, 120c 30m, 20x) 1% vibration ( 0.75mm, 100m/s 2 , 10-54hz, 10x, xyz ) 0.25% insulation resistance > 1000 megohm technology thick film thin film substrate alo alumina / cu flange aln torque terminals: 1.0 nm max / 0.6 nm recommended mounting: 1.6 nm max / 1 nm recommended part description: part type - resistance - terminal style - tolerance pf2274 10 ohms x 5% ordering information pf2270 series
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 5/13 pf2270 series thin film power resistors power rating notes - the pf2270 series foil resistors must be attached to a suitable heatsink. the maximum internal resistor temperature is 155c. to specify an appropriate heatsink use the following formula : r h = t max - ( p x r r ) - t a p where: r h = thermal resistance of heatsink ( k/w ) r r = thermal resistance of resistor ( k/w ) t max = maximum temperature of resistor t a = ambient temperature of heatsink ( c ) p = power through resistor ( w ) specifications (continued) 0 25 50 75 100 125 150 175 200 0 20 40 60 80 100 120 power ( % ) backplate temperature (c) power derating curve 1 4 3 2 style x 1 4 3 2 style y 1 4 3 2 style z note: style z is not a true 4-terminal measurement current can be applied to any pins standard termination styles 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
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