FHR 4-2321 Current Sense Resistors • • • • • 0.001 to 50 Ohm Power Rating to 40Watt Resistance Tolerances to ±0.1% TCR to ±15ppm/°C Very Low Inductive SPECIFICATIONS Type FHR 4-2321 Resistance Range 0.001 to 50 Ohm Power rating (70°C) 3W Power Rating with Heat Sink 40W Max. Pulse Energy Tolerances: 350J / 500ms from 0.001 Ohm from 0.005 Ohm from 0.01 Ohm 1% / 2% / 5% 0.5% / 1% / 2% / 5% 0.1% / 0.25% / 0.5% / 1% / 2% / 5% Thermal Resistance 2.0 C/W Stability (1000h) 0.1% / 0.2% / 0.5% (depends on stress) Temperature Coefficient 0.001 to 50 Ohms (Q) Option 1 (P) upon request for selected values ±25ppm/C (20 to 60°C) ±15ppm/C (20 to 60°C) other specifications upon request Insolation Resistance 300 VDC Max. Current 150 A Thermal EMF < 1µV/K Operating Temperature Range -40 to 130°C Resistor Material CuNiMn-Foil Substrate Anodized aluminium Connector Material Cu / tinned Terminals 4 Max Torque 0.8 Nm Ordering Information Part Description: Part Type - Resistance - Tolerance - TCR FHR 4-2321 0.035 Ohms 0.25% Q Riedon Inc. 02/16 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 27 FHR 4-2321 Current Sense Resistors SPECIFICATIONS (continued) Temperature Coefficient 2000 0 Limit 2 ∆R/R (ppm) -2000 -4000 Nominal ∆R/R -6000 -8000 Limit 1 -10000 -40 -20 0 20 40 60 80 100 120 140 Temperature (°C) Derating Power Rating Notes The FHR Series Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 130°C. To specify an appropriate heatsink use the following formula : Power ( % from nominal power) 120 0.5% 100 0.2% 80 0.1% 60 RθH = TMAX - ( P x RθR ) - TA P 40 20 Where: 0 25 50 85 100 115 130 Temperature of the backplate (°C) RθH = Thermal Resistance of Heatsink ( K/W ) RθR = Thermal Resistance of Resistor ( K/W ) TMAX = Maximum Temperature of Resistor TA = Ambient Temperature of Heatsink ( °C ) P = Power Through Resistor ( W ) Dimensions Riedon Inc. 02/16 300 Cypress Avenue tol. (±mm) inches tol. (±inches) Dimension mm A 17.25 ±0.2 0.68 ±0.008 B 22.30 ±0.2 0.88 ±0.008 C 3.20 ±0.1 0.13 ±0.004 D Ø3.20 ±0.1 Ø0.13 ±0.004 E 16.75 ±0.008 0.66 ±0.2 F 7.62 ±0.008 0.30 ±0.2 G 17.78 ±0.008 0.70 ±0.2 H 1.50 ±0.2 0.06 ±0.008 I 1.10 ±0.008 0.04 ±0.2 J 2.00 ±0.004 0.08 ±0.1 K 3.00 ±0.004 0.12 ±0.1 L 8.00 ±0.008 0.31 ±0.2 M 3.00 ±0.008 0.12 ±0.2 N 1.50 ±0.004 0.06 ±0.1 O 4.50 ±0.004 0.18 ±0.1 P 3.75 ±0.008 0.15 ±0.2 Q 0.80 ±0.1 0.03 ±0.004 R 2.10 ±0.008 0.08 ±0.2 Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 28