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riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com page 80 07/13 npr nps 2-t220 nhr nhs 2-t220 t221 power resistors type npr / nps nhr / nhs resistance range 0.02 ohms to 100kohms 0.02 ohms to 15kohms power rating free air 70c with heatsink 1.5 w 30 w 1.5 w 50 w thermal resistance rthj-c 3.5 k/w 2.1 k/w tolerances from 0.02 ohms from 1.0 ohms 2% / 5% 1% / 2% / 5% stability 0.5% temperature coeffcient 0.02 to 0.049 ohms 0.05 to 0.099 ohms 0.1 ohms to 100 kohms 600 ppm/c 300 ppm/c 100 ppm/c upon request 50 ppm/c voltage proof 2.0 kvdc 1.5 kvdc max. voltage depending on resistance value 1 10 100 1000 10000 2 ohm 10 ohm 100 ohm 1 kohm 5 kohm 10 kohm 100 kohm max. working voltage (vdc) operating temperature range -40 to 155c resistor material thick film substrate al 2 o 3 housing epoxy or pps connector material cu tinned terminals 2 max. torque t220: 1 nm t221: 0.8 nm specifications part description: part type - resistance - contact - tolerance nhr 2-t221 c 1.1 kohms 1% ordering information ? resistances from 0.02ohm to 100kohms ? power rating to 50watt ? resistance tolerances to 1% ? tcr to 50ppm/c ? load stability to 0.5% ? to-220 housing ? convenient smd d2pak available power resistors
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com page 81 07/13 0 20 40 60 80 100 120 25 50 85 100 115 130 145 155 temperature of the backplate (c) power ( % from nominal power) temperature coeffcient specifications (continued) npr nps 2-t220 t221 nhr nhs 2-t220 t221 derating power resistors -8000 -3000 2000 7000 -50 -25 0 25 50 75 100 125 50ppm/c 100ppm/c ?r/r (ppm) temperature (c) dimension mm tol. (mm) inches tol. (inches) a 12.70 0.2 0.50 0.008 b 10.16 0.2 0.40 0.008 c 0.76 0.1 0.03 0.004 d 5.08 0.1 0.20 0.004 e 4.00 0.1 0.16 0.004 f 1.20 0.1 0.05 0.004 g 14.60 0.2 0.57 0.008 h 15.00 0.2 0.59 0.008 i 17.33 0.2 0.68 0.008 j 0.40 0.1 0.02 0.004 k 1.85 0.1 0.07 0.004 dimension mm inches a 12.10 0.476 b 11.16 0.439 c 18.33 0.722 d 5.08 0.200 e 1.76 0.069 f 3.20 0.126 nps / nhs 2-t220 dimensions power rating notes - the npr / nhr series 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 qh = t max - ( p x r qr ) - t a p where: r qh = thermal resistance of heatsink ( k/w ) r qr = 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.com page 82 07/13 specifications (continued) npr nps 2-t220 t221 nhr nhs 2-t220 t221 power resistors npr / nhr 2-t220 npr / nhr 2-t221 dimension mm tol. (mm) inches tol. (inches) a 17.30 0.2 0.68 0.008 b 10.16 0.2 0.40 0.008 c 6.00 0.1 0.24 0.004 d ?3.7 0.1 ?0.146 0.004 e 16.40 0.2 0.65 0.008 f 5.08 0.1 0.20 0.004 g 0.76 0.1 0.03 0.004 h 1.30 0.1 0.05 0.004 i 13.80 0.2 0.54 0.008 j 2.00 0.1 0.08 0.004 k 1.20 0.1 0.05 0.004 l 4.00 0.1 0.16 0.004 m 2.90 0.1 0.11 0.004 n 0.40 0.1 0.02 0.004 o 1.85 0.1 0.07 0.004 dimension mm tol. (mm) inches tol. (inches) a 18.30 0.2 0.72 0.008 b 10.16 0.2 0.40 0.008 c 3.70 0.1 0.15 0.004 d ?3.2 0.1 ?0.126 0.004 e 16.40 0.2 0.65 0.008 f 5.08 0.1 0.20 0.004 g 0.76 0.1 0.03 0.004 h 1.30 0.1 0.05 0.004 i 13.80 0.2 0.54 0.008 j 2.00 0.1 0.08 0.004 k 1.20 0.1 0.05 0.004 l 4.00 0.1 0.16 0.004 m 3.90 0.1 0.15 0.004 n 0.40 0.1 0.02 0.004 o 1.85 0.1 0.07 0.004

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