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| riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com page 83 07/13 ? resistances from 0.025ohm to 10kohms ? power rating to 25watt ? resistance tolerances to 1% ? tcr to 100ppm/c ? load stability to 0.5% ? to-126 housing (d-pak) ? solder refow secure at 260c / 20s nps 2-t126 type nps 2-t126 terminals 2 resistance range 0.025 to 0.049ohms 0.05 to 0.099ohms 0.1 to 0.99ohms 1ohms to 10kohms power rating (with heatsink) 25 w thermal resistance rthj-c 6.0 k/w tolerances (others upon request) 2% / 5% 1% / 2% / 5% stability 0.5% temperature coeffcient (tcr 50ppm upon request) 500 ppm/c 400 ppm/c 300 ppm/c 100 ppm/c voltage proof 2.0 kv dc operating temperature -40c to 175c resistor material thick film substrate al 2 o 3 housing epoxy connector material cu / ni-fash / lead-free tinned refow soldering lead-free soldering 260c / 20s specifications part description: part type - resistance - tolerance nps 2-t126 1.1 ohms 1% ordering information power smd resistors
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com page 84 07/13 derating dimensions specifications (continued) nps 2-t126 power smd resistors dimension mm tol. (mm) inches tol. (inches) a 8.26 0.2 0.33 0.008 b 8.13 0.2 0.32 0.008 c 6.35 0.1 0.25 0.004 d 4.31 0.1 0.17 0.004 e 1.35 0.1 0.05 0.004 f 5.08 0.1 0.20 0.004 g 0.76 0.1 0.03 0.004 h 2.79 0.1 0.11 0.004 i 0.8 0.1 0.03 0.004 j 9.55 0.2 0.38 0.008 k 10.92 0.2 0.43 0.008 l 12.32 0.2 0.49 0.008 m 0.6 0.1 0.02 0.004 n 1.47 0.1 0.06 0.004 dimension mm inches a 8.51 0.335 b 7.87 0.310 c 14.1 0.555 d 5.08 0.200 e 1.65 0.065 f 3.81 0.150 power rating notes - the nps series resistors must be attached to a suitable heat - sink. the maximum internal resistor temperature is 175c. 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 ) 0 20 40 60 80 100 120 0 25 40 55 70 85 100 115 130 145 155 175 temperature of the backplate (c) power (% from nominal power) |
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