rev. 03/2006a fhr 4-2820h type fhr 4-2820h resistance range 0.001 to 0.01 ohms other values upon request power rating free air 70c with heatsink 3 w 10 w tolerances 1% / 5% other tolerances upon request thermal resistance 8.0 k/w stability 0.5% temerature coeffcient 30ppm/k (20 to 60c) insolation resistance 50 vdc max. current 100 a thermal emf < 0.1v/k operating temperature range -40 to 130c resistor material cunimn-foil substrate anodized aluminium connector material cu / tinned terminals 4 specifications part number - resistance - tolerance fhr 4-2820h 0.01 ohms 1% ordering information resistances from 0.001ohm to 0.01ohms power rating to 10watt resistance tolerances to 1% tcr to 30ppm/k load stability to 0.5% customized resistance values ? ? ? ? ? ? special resistors willow technologies ltd. shawlands court, newchapel road, lingfield, surrey, rh7 6bl, united kingdom. + 44 (0) 1342 835234 + 44 (0) 1342 834306 info@willow.co.uk http://www.willow.co.uk
rev. 03/2006a 0 20 40 60 80 100 120 25 50 70 85 100 115 130 power (% from nominal power) ambient temperature (c) 0 20 40 60 80 100 120 25 50 85 100 115 130 temperature of the backplate (c) power (% from nominal power) derating temperature coeffcient specifications (continued) fhr 4-2820h dimensions special resistors -15ppm/k +15ppm/k nominal ?r/r limit 2 (3) limit 1 (3) temperature (c) ?r/r (ppm) 4000 2000 0 -2000 -4000 -6000 -8000 -20 0 -40 80 140 120 100 60 20 40 without heatsink with heatsink dimension mm tol. (mm) inches tol. (inches) a 8.50 0.2 0.33 0.008 b 25.75 0.2 1.01 0.008 c 2.00 0.2 0.08 0.008 d 5.08 0.1 0.20 0.004 e 0.80 0.1 0.03 0.004 f 3.00 0.1 0.12 0.004 g 1.30 0.1 0.05 0.004 h 5.08 0.1 0.20 0.004 i 2.60 0.1 0.10 0.004 j 3.00 0.1 0.12 0.004 k 1.90 0.1 0.07 0.004 l 5.08 0.1 0.20 0.004 m 3.60 0.1 0.14 0.004 n 20.00 0.2 0.79 0.008 o 18.84 0.2 0.74 0.008 p 27.50 0.2 1.08 0.008 willow technologies ltd. shawlands court, newchapel road, lingfield, surrey, rh7 6bl, united kingdom. + 44 (0) 1342 835234 + 44 (0) 1342 834306 info@willow.co.uk http://www.willow.co.uk
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