KPR KPN 2/4-T227 KHR KHN 2/4-T227 Power Resistors • • • • • Resistances from 0.05Ohm to 5MOhms Power Rating to 200Watt Resistance Tolerances to ±1% TCR to ±50ppm/K TO-227 (TO-238) Housing SPECIFICATIONS Type KPR 2/4-T227 KPN 2-T227 Resistance Range KHR 2/4-T227 KHN 2-T227 0.05 Ohms to 5 MOhms Power rating with heatsink 100 W 200 W Thermal Resistance Rthj-c 0.7 K/W 0.35 K/W Tolerances from 0.05 Ohms from 0.1 Ohms 2% / 5% / 10% 1% / 2% / 5% / 10% Stability 1% Temperature Coefficient 0.05 to 0.099 Ohms 0.1 to 5 MOhms ±300 ppm/K ±100 ppm/K upon request ±50 ppm/K Voltage Proof 1.5 kVDC or 2.5 kVDC (upon request) Inductivity ≤ 50 nH Capacity ≤ 35 pF Max. Voltage depending on resistance value max. working voltage (VDC) 10000 1000 100 10 1 10 Ohm Operating Temperature Range 100 Ohm 1 kOhm 5 kOhm 10 kOhm 100 kOhm -55 to 155°C Resistor Material Thick Film Substrate Al2O3 Housing Epoxy or Plastic Connector Material Cu tinned Terminals 2 or 4 Max. Torque backplate terminals 1.5 Nm 1.3 Nm Ordering Information Part Number - Resistance - Tolerance KHR 2-T227 10 Ohms 5% Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com Page 62 rev. 01/2011 KPR KPN 2/4-T227 KHR KHN 2/4-T227 Power Resistors SPECIFICATIONS (continued) Temperature Coefficient 100ppm/K ∆R/R (ppm) 7000 50ppm/K 2000 -3000 -8000 -50 -25 0 25 50 Derating 120 Power ( % from nominal power) 75 Temperature (°C) 100 125 Power Rating Notes - The KPR / KPN / KHR / KHN 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 60 RqH = TMAX - ( P x RqR ) - TA P 40 20 Where: 0 50 75 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 ) Pulse Stability 10kJ 3kJ 1kJ Pulse Energy 300J 100J 30J 10J 3J 1J 0,3J 10 0 50 20 10 5 2 1 0, 5 0, 2 0, 1 0, 05 0, 02 0, 01 0, 00 1 0, 00 2 0, 00 5 0, 00 02 0, 00 05 0,1J Pulse time (s) Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com Page 63 rev. 01/2011 KPR KPN 2/4-T227 KHR KHN 2/4-T227 Power Resistors SPECIFICATIONS (continued) Dimensions and Attachment Variations KPR/KHR 2-T227 KPR/KHR 2-T227 dia1 Riedon Inc. 300 Cypress Avenue 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 KPR/KHR 4-T227 KPN/KHN 2-T227 KPR/KHR 2-T227 dia2 Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com Page 64 rev. 01/2011