NPR NPS 2-T220 T221 NHR NHS 2-T220 T221 Power Resistors • • • • • • • Resistances from 0.02Ohm to 100kOhms Power Rating to 50Watt Resistance Tolerances to ±1% TCR to ±50ppm/K Load Stability to 0.5% TO-220 Housing Convenient SMD D2Pak Available SPECIFICATIONS Type Resistance Range NPR / NPS NHR / NHS 0.02 Ohms to 100kOhms 0.02 Ohms to 15kOhms 1.5 W 30 W 1.5 W 50 W 3.5 K/W 2.1 K/W Power rating free air 70°C with heatsink Thermal Resistance Rthj-c Tolerances from 0.02 Ohms from 1.0 Ohms 2% / 5% 1% / 2% / 5% Stability 0.5% Temperature Coefficient 0.02 to 0.049 Ohms 0.05 to 0.099 Ohms 0.1 Ohms to 100 kOhms ±600 ppm/K ±300 ppm/K ±100 ppm/K upon request ±50 ppm/K Voltage Proof 2.0 kVDC Max. Voltage depending on resistance value 1.5 kVDC max. working voltage (VDC) 10000 1000 100 10 1 2 Ohm Operating Temperature Range 10 Ohm 100 Ohm 1 kOhm 5 kOhm 10 kOhm 100 kOhm -40 to 155°C Resistor Material Thick Film Substrate Al2O3 Housing Epoxy or PPS Connector Material Cu tinned Terminals 2 Max. Torque T220: 1 Nm T221: 0.8 Nm Ordering Information Part Number - Resistance - Contact - Tolerance NHR 2-T221 C 1.1 kOhms 1% Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com Page 80 rev. 03/2006A NPR NPS 2-T220 T221 NHR NHS 2-T220 T221 Power Resistors SPECIFICATIONS (continued) Temperature Coefficient 100ppm/K ∆R/R (ppm) 7000 50ppm/K 2000 -3000 -8000 -50 -25 0 25 Derating 120 Power ( % from nominal power) 50 75 Temperature (°C) 100 125 Power Rating Notes - The NPR / NHR Series Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 155°C. To specify an appropriate heatsink use the following formula : 100 80 RqH = TMAX - ( P x RqR ) - TA P 60 40 20 Where: 0 25 50 85 100 115 130 145 155 Temperature of the backplate (°C) RqH = Thermal Resistance of Heatsink ( K/W ) RqR = Thermal Resistance of Resistor ( K/W ) TMAX = Maximum Temperature of Resistor TA = Ambient Temperature of Heatsink ( °C ) P = Power Through Resistor ( W ) Dimensions NPS / NHS 2-T220 Dimension mm tol. (±mm) inches tol. (±inches) A 12.70 0.2 0.50 0.008 Dimension mm inches B 10.16 0.2 0.40 0.008 A 12.10 0.476 C 0.76 0.1 0.03 0.004 B 11.16 0.439 D 5.08 0.1 0.20 0.004 C 18.33 0.722 0.004 D 5.08 0.200 0.004 E 1.76 0.069 F 3.20 0.126 E F Riedon Inc. 4.00 1.20 0.1 0.1 0.16 0.05 G 14.60 0.2 0.57 0.008 H 15.00 0.2 0.59 0.008 I 17.33 0.2 0.68 0.008 J 0.40 0.1 0.02 0.004 K 1.85 0.1 0.07 0.004 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com Page 81 rev. 03/2006A NPR NPS 2-T220 T221 NHR NHS 2-T220 T221 Power Resistors SPECIFICATIONS (continued) NPR / NHR 2-T220 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 Ø3.7 0.1 Ø0.146 0.004 E 16.40 0.2 0.65 0.008 F 5.08 0.1 0.20 0.004 G 0.76 0.1 0.03 0.004 H 1.30 0.1 0.05 0.004 I 13.80 0.2 0.54 0.008 J 2.00 0.1 0.08 0.004 K 1.20 0.1 0.05 0.004 L 4.00 0.1 0.16 0.004 M 2.90 0.1 0.11 0.004 N 0.40 0.1 0.02 0.004 O 1.85 0.1 0.07 0.004 Dimension mm tol. (±mm) inches tol. (±inches) A 18.30 0.2 0.72 0.008 NPR / NHR 2-T221 Riedon Inc. 300 Cypress Avenue B 10.16 0.2 0.40 0.008 C 3.70 0.1 0.15 0.004 D Ø3.2 0.1 Ø0.126 0.004 E 16.40 0.2 0.65 0.008 F 5.08 0.1 0.20 0.004 G 0.76 0.1 0.03 0.004 H 1.30 0.1 0.05 0.004 I 13.80 0.2 0.54 0.008 J 2.00 0.1 0.08 0.004 K 1.20 0.1 0.05 0.004 L 4.00 0.1 0.16 0.004 M 3.90 0.1 0.15 0.004 N 0.40 0.1 0.02 0.004 O 1.85 0.1 0.07 0.004 Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com Page 82 rev. 03/2006A