FHR4-T238

FHR FNR 2-T238 4-T238 • Extremely Low Ohm Rating • High Stability • Two- and Four Circuit Technology • Low Temperatur Coefficient • Low Electrical Noise • Low Inductance SPECIFICATIONS ELECTRICAL Resistance Range Power Rating : : FHR 2/4-T238 FHN 2-T238 R01/R001...100R 60 W* * with heatsink 1.3 K/W FNR 2/4-T238 FNN 2-T238 R01/R001...100R 80 W* Thermal Resistance Rthj-c : Tolerances : 1.0 K/W 0.5%, 1%, 2%, 5% (other Tolerances upon request) 0.5 ±15 ppm/K (20...60)°C / ±50 ppm/K (-40...130)°C R < R02: ±20 ppm/K (20...60)°C FHR/FNR2-T238 as well as FHN/FNN TCR-Shift depending on the resistor value 2.5 kVDC < 1 µV/K 40 A 45 A (higher Values upon request) Stability Temperatur Coefficient : : Voltage Proof Thermal EMF Max. Current : : : ENVIRONMENTAL Operative Temperature Range : -40°C...130°C Metalfoil CuNiMn ( DIN 17471) Al2O3 AlN Epoxy Cu or brass, tinned 2-pin, 4-pin MECHANICAL Resistor Material Substrate Housing Connector Material : : : : Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail sales@willow.co.uk web www.willow.co.uk FHR FNR 2-T238 4-T238 TEMPERATURE COEFFICIENT (FHR/FNR and FHN/FNN 2-T238) 6000 4000 2000 0 -2000 -4000 -6000 -40 + 50 ppm/K - 50 ppm/K TCR - Shift (ppm/K) 300 250 + 15 ppm/K 200 150 100 50 0 2 5 10 20 50 100 Resistance Value (m Ohm ) dR/R (ppm ) - 15 ppm/K Limit 2 (3σ) Nom inal dR/R Limit 1 (3σ) -20 0 20 40 60 80 100 120 140 Tem perature (°C) DERATING CURVE 120 Power ( % from nominal power) 100 80 60 40 20 0 25 50 85 100 115 130 Tem perature of the backplate (°C) DIMENSIONS * screw terminal M4 Standard: Pin G (width= 6.35) leads curved Dimensions in mm Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail sales@willow.co.uk web www.willow.co.uk FHR FNR 2-T238 4-T238 FAULTY CONNECTION VARIATIONS FHR/FNR 2-T238 FHR/FNR 4-T238 1 - U1 / 2 - U2 / 3 - I2 / 4 - I1 Dimensions in mm HOW TO ORDER FHR 2-T238 1R1 G 1% FNR 4-T238 R001 F 2% Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail sales@willow.co.uk web www.willow.co.uk