FPR FNR 2-T227 4-T227 In Stock At Riedon Foil Power Resistors • • • • • Resistances from 0.001Ohm to 100Ohms Power Rating to 80Watt Resistance Tolerances to ±0.1% TCR to ±15ppm/°C Load Stability to 0.1% SPECIFICATIONS Type Terminals Resistance Range FPR 2-T227 FPR 4-T227 FNR 2-T227 FNR 4-T227 2 4 (kelvin connection) 2 4 (kelvin connection) 0.001 to 100 Ohms 0.01 to 100 Ohms 0.01 to 100 Ohms Power Rating (with heatsink) 60W Thermal Resistance Rthj-c 0.001 to 100 Ohms 80W 1.3 K/W 1.0 K/W Tolerances (depends on resistance) 0.1% / 1% / 2% / 5% (others upon request) 1 Stability 0.1% / 0.2% / 0.5% (depends on stress) Temperature Coefficient ±15 ppm/K (20 to 60°C) from R < 0.02 Ohms ±20 ppm/K (20 to 60°C) FPR 2-T227 / FNR 2-T227 TK Shift depends from resistance value (see graph next page) Voltage Proof 1.5 kV DC ( higher upon request ) Thermal EMF < 1 µV/K Max. Current 45A (85A on request) 50A (100A on request) Operating Temperature -40°C to 130°C Resistor Material Metalfoil CuNiMn (DIN 17471) Substrate Al2O3 Housing AlN Epoxy Connector Material Cu / tinned or nickel plated Max. Torque backplate: 1.5Nm terminals: 1.3 Nm 1 Please inquire for low ohm values Ordering Information Part Description: Part Type - Resistance - Tolerance FPR 2-T227 1.1 Ohms 1% Riedon Inc. 300 Cypress Avenue 06/13 Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com FPR FNR 2-T227 4-T227 Foil Power Resistors SPECIFICATIONS (continued) Temperature Coefficient 4000 2000 +15ppm/°C 200 TCR - Shift (ppm/K) ∆R/R (ppm) table A 250 0 150 -15ppm/°C -2000 Nominal ∆R/R -6000 -8000 100 Limit 2 (3σ) -4000 50 Limit 1 (3σ) -40 -20 0 20 40 60 80 100 120 0 140 2 Temperature (°C) 5 10 20 50 100 200 Resistance Value (mOhm) Derating and Stability Power Rating Notes - Power ( % from nominal power) 120 100 0.5% 80 0.2% 60 0.1% The FPR/FNR Series Foil Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 130°C for a 0.5% stability part. To specify an appropriate heatsink use the following formula : RθH = TMAX - ( P x RθR ) - TA P 40 20 Where: 0 25 50 85 100 115 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 ) 130 Tem perature of the backplate (°C) Dimensions and Attachment Variations FPR/FNR 2-T227 FPR/FNR 4-T227 Riedon Inc. 300 Cypress Avenue 06/13 Dimension mm tol. (±mm) inches tol. (±inches) A 26 0.5 1.02 0.020 B 38 0.5 1.50 0.020 C 12.7 0.2 0.50 0.008 D 4 0.2 0.16 0.008 E 30 0.2 1.18 0.008 F 15 0.2 0.59 0.008 G 4.1 0.2 0.16 0.008 H 10 0.2 0.39 0.008 I 8 0.2 0.31 0.008 J 4 0.2 0.16 0.008 K 2 0.2 0.08 0.008 L 0.8 0.1 0.03 0.004 M M4 M4 N 10 0.2 0.39 0.008 O 11.9 0.2 0.47 0.008 Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com