riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.co m page 62 rev. 03/2006a kpr kpn 2/4-t227 khr khn 2/4-t227 power resistors type kpr 2/4-t227 kpn 2-t227 khr 2/4-t227 khn 2-t227 resistance range 0.05 ohms to 5 mohms power rating with heatsink 100 w 200 w thermal resistance rthj-c 0.7 k/w 0.35 k/w tolerances from 0.05 ohms from 0.1 ohms 2% / 5% / 10% 1% / 2% / 5% / 10% stability 1% temperature coeffcient 0.05 to 0.099 ohms 0.1 to 5 mohms 300 ppm/k 100 ppm/k upon request 50 ppm/k voltage proof 2.5 kvdc inductivity 50 nh capacity 35 pf max. voltage depending on resistance value 1 10 100 1000 10000 10 ohm 100 ohm 1 kohm 5 kohm 10 kohm 100 kohm max. working voltage (vdc) operating temperature range -55 to 155c resistor material thick film substrate al 2 o 3 housing epoxy or plastic connector material cu tinned terminals 2 or 4 max. torque backplate terminals 1.5 nm 1.3 nm specifications part number - resistance - tolerance khr 2-t227 10 ohms 5% ordering information resistances from 0.05ohm to 5mohms power rating to 200watt resistance tolerances to 1% tcr to 50ppm/k to-227 (to-238) housing ? ? ? ? ?
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.co m page 63 rev. 03/2006a 0 , 0 0 0 2 0 , 0 0 0 5 0 , 0 0 1 0 , 0 0 2 0 , 0 0 5 0 , 0 1 0 , 0 2 0 , 0 5 0 , 1 0 , 2 0 , 5 1 2 5 1 0 2 0 5 0 1 0 0 pulse time (s) pulse energy 10kj 3kj 1kj 300j 100j 30j 10j 3j 1j 0,3j 0,1j -8000 -3000 2000 7000 -50 -25 0 25 50 75 100 125 50ppm/k 100ppm/k ?r/r (ppm) temperature (c) 0 20 40 60 80 100 120 50 75 85 100 115 130 145 155 temperature of the backplate (c) power ( % from nominal power) temperature coeffcient specifications (continued) kpr kpn 2/4-t227 khr khn 2/4-t227 pulse stability derating power resistors power rating notes - the kpr / kpn / khr / khn series resistors must be attached to a suitable heatsink. the maximum internal resistor tempera - ture is 155c. 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 )
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.co m page 64 rev. 03/2006a specifications (continued) power resistors dimensions and attachment variations kpr/khr 2-t227 dimension mm tol. (mm) inches tol. (inches) a 26 0.5 1.02 0.020 b 38 0.5 1.50 0.020 c 12.7 0.2 0.50 0.008 d 4 0.2 0.16 0.008 e 30 0.2 1.18 0.008 f 15 0.2 0.59 0.008 g 4.1 0.2 0.16 0.008 h 10 0.2 0.39 0.008 i 8 0.2 0.31 0.008 j 4 0.2 0.16 0.008 k 2 0.2 0.08 0.008 l 0.8 0.1 0.03 0.004 m m4 m4 n 10 0.2 0.39 0.008 o 11.9 0.2 0.47 0.008 kpr/khr 4-t227 kpn/khn 2-t227 kpr kpn 2/4-t227 khr khn 2/4-t227 kpr/khr 2-t227 dia1 kpr/khr 2-t227 dia2
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