riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 8/10 ? to-263 housing (d-pak) ? resistances from 0.01ohm to 51kohms ? power rating to 35watt ? resistance tolerances to 1% ? tcr to 50ppm/k ? load stability to 1% ? solder refow secure at 260c / 20s ? isolated back plate PFS35 type PFS35 terminals 2 power rating (with heatsink) 35 w ( 2w on simple solder pad ) thermal resistance rthj-c 3.3 k/w resistance range 0.01 to 0.099ohms 0.1 to 9.9ohms 10 to 51kohms tolerances (others upon request) 5% 1% / 5% 1% temperature coeffcient 250 ppm/k 100 ppm/k 50 ppm/k operating temperature -55c to 155c max operating voltage 500v voltage proof 2.0kv dc insulation resistance over 1,000 megohm resistor material thin film load life 1% 90 min on, 30 min off, 1000 hrs @ 25c humidity 1% 90-95% rh, 0.1w, 1000 hrs @ 40c temperature cycle 0.25% -55c for 30 min, +155c for 30 min, 5 cycles solder heat 0.1% 350c 5c for 3 seconds vibration 0.25% iec60068-2-6 refow soldering lead-free soldering 260c / 20s specifications part number - resistance - tolerance PFS35 10 ohms 1% ordering information power smd film resistors
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 8/10 derating dimensions specifications (continued) PFS35 power smd film resistors dimension mm tol. (mm) inches tol. (inches) a 10.3 0.2 0.405 0.008 b 10.1 0.2 0.400 0.008 c 15.3 1.0 4.54 0.04 d 5.08 0.1 0.200 0.004 e 1.5 0.05 0.060 0.002 f 0.75 0.05 0.030 0.002 g 2.2 0.2 0.087 0.008 h 4.5 0.2 0.177 0.008 j 0.5 0.05 0.020 0.002 k 2.5 0.5 0.10 0.02 l 5.0 1.0 0.20 0.04 power rating notes - the PFS35 series resistors must be attached to a suitable heatsink. the maximum internal resistor temperature is 175c. to specify an appropriate heatsink use the following formula : r q h = t max - ( p x r q r ) - t a p where: r q h = thermal resistance of heatsink ( k/w ) r q 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 ) 0 20 40 60 80 100 120 25 50 85 100 115 130 145 155 temperature of the backplate(c) power (% from nominal power) note: back plate is isolated from both pins.
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