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riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.co m page 132 rev. 03/2006a usr unr 4-t220 / t220b uss uns 4-t220 type usr / uss unr /uns resistance range 0.2 to 80 ohms power rating free air 70c with heatsink 1.5w 10w 1.5w 15w thermal resistance rthj-c 10.8 k/w 6.8 k/w tolerances from 0.5 ohms from 10.0 ohms from 50.0 ohms 0.1% / 0.25% / 0.5% / 1% 0.05% / 0.1% / 0.25% / 0.5% / 1% 0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1% stability 0.01% shelf life stability 25ppm / ?r after 1 year 50ppm / ?r after 3 year temperature coeffcient max. 5ppm/k (-55 to 155c) typ. 3ppm/k (-55 to 125c) upon request 1ppm/k (0 to 60c) voltage proof 1 kvdc thermal emf < 0.1v/k operating temperature range -55 to 155c resistor material nicr-foil substrate al 2 o 3 aln housing epoxy + cu heatsink nickel plated connector material cu tinned terminals 4 max. torque 1.0 nm notes specially designed for applications with fast changing electrical load specifications part number - resistance - contact - tolerance - tcr unr 2-t220b 5.7kohms c 0.5% 3ppm ordering information resistances from 0.2ohm to 80ohms power rating to 15watt resistance tolerances to 0.01% tcr to 1ppm/k load stability to 0.01% ? ? ? ? ? precision shunt resistors
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.co m page 133 rev. 03/2006a 0 20 40 60 80 100 120 25 50 85 100 115 130 145 155 temperature of the backplate(c) power (% from nominal power) power rating notes - the u-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 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 ) -800 -600 -400 -200 0 200 400 600 800 -50 -25 0 25 50 75 100 125 -5ppm/k +5ppm/k 1rplqdo55 nominal spread 2.3ppm/k nominal spread 2.3ppm/k temperature (c) 55ssp derating 7hpshudwxuhrhiflhqw specifications (continued) usr unr 4-t220 / t220b uss uns 4-t220 dimensions uss 4-t220 / uns 4-t220 precision shunt resistors 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 2.54 0.1 0.10 0.004 e 7.62 0.1 0.30 0.004 f 4.00 0.1 0.16 0.004 g 1.20 0.1 0.05 0.004 h 14.60 0.2 0.57 0.008 i 15.00 0.2 0.59 0.008 j 17.33 0.2 0.68 0.008 k 0.40 0.1 0.02 0.004 l 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 7.62 0.300 e 2.54 0.100 f 1.76 0.069 g 3.20 0.126
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.co m page 134 rev. 03/2006a dimensions specifications (continued) usr unr 4-t220 / t220b uss uns 4-t220 usr 4-t220b / unr 4-t220b usr 4-t220 / unr 4-t220 precision shunt resistors dimension mm tol. (mm) inches tol. (inches) a 15.30 0.2 0.60 0.008 b 10.00 0.2 0.39 0.008 c 2.80 0.1 0.11 0.004 d ?3.7 0.1 ?0.146 0.004 e 2.54 0.1 0.10 0.004 f 7.62 0.1 0.30 0.004 g 1.27 0.1 0.05 0.004 h 4.60 0.1 0.18 0.004 i 6.00 0.2 0.24 0.008 j 35.30 2.0 1.39 0.079 k ?0.6 0.1 ?0.02 0.004 l 2.41 0.1 0.09 0.004 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 7.62 0.2 0.30 0.008 g 2.54 0.1 0.10 0.004 h 1.30 0.1 0.05 0.004 i 0.76 0.1 0.03 0.004 j 1.03 0.1 0.04 0.004 k 10.00 0.2 0.39 0.008 k (c-contact) 13.80 0.2 0.54 0.008 l 2.00 0.1 0.08 0.004 m 1.20 0.1 0.05 0.004 n 4.00 0.1 0.16 0.004 o 2.90 0.1 0.11 0.004 p 0.40 0.1 0.02 0.004 q 1.85 0.1 0.07 0.004

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