NPR2-T126

NPR NPP 2-T126 TO-126 Power Film Resistors • • • • • • • Resistances from 0.01 to 51K Ohms Power Rating to 20Watt Resistance Tolerances to ±0.05% TCR to ±5ppm/K TO-126 Housing Convenient SMD DPak Available Low Inductance ( 0.1W ) ±5% ±0.05% / ±0.1% / ±0.25% ( R > 5W ) ±0.5% ( R > 1W ) / ± 1% ( R > 0.1W ) ±2% / ±5% 1 2 Temperature Coefficients ±50ppm/K ( R>10W ) ±100ppm/K ( R>0.1W ) ±250ppm/K ±5 / ±10ppm/K ( R>1W ) ±25ppm/K ( R >0.1W ) ±100ppm/K NPR 2-T126 20W 1W 5.9K/W NPP 2-T126 5W 0.5W 6.0K/W 0.1W 51KW Power rating based on 25°C Flange Temperature Power rating based on 25°C Ambient Temperature 3 Consult Factory for Higher or Lower Values Specification Maximum Current Temperature Range Dielectric Strength Max. Operating Voltage Insulation Resistance Value 25A -55°C to +155°C : NPP 2T126 -55°C to +120°C : NPR 2-T126 2000 VAC 500 V >1000 Meg-Ohm Environmental Performance Load Life Humidity Resistance Temperature Cycle Solder Heat Vibration DR ±1% ±1% ±0.25% ±0.1% ±0.25% Test Conditions 25°C / 90 min ON / 30 min OFF / 1000 hr 40°C / 90-95% RH / DC 0.1W / 1000 hr -55°C for 30 min / +155°C for 30 min / 1000 hr +350°C / 3s Riedon Inc. 1.01 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 78 NPR NPP 2-T126 TO-126 Power Film Resistors SPECIFICATIONS (continued) Power Derating Curve 120 100 Power Rating Notes The NPR 2-T126 Series Foil Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 155°C (120°C for the NPP 2-T126). To specify an appropriate heatsink use the following formula : Power ( % ) 80 60 40 20 0 NP NP P 2 -T 12 R 2-T 12 6 6 RqH = TMAX - ( P x RqR ) - TA P 125 150 175 -25 0 25 50 75 100 Ambient Temperature (°C) Where: 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 ) Mounting Notes - The NPR 2-T126 Series Film Resistors must be attached to a suitable heatsink. Mount resistor using thermal grease to a clean / flat surface. Use a compression washer to provide 150 to 300 pounds ( 665 to 1330N ) of mounting force. Torque mounting screw to 8 in-lbs ( 0.9 Nm ). Ordering Information Part Number - Resistance - Tolerance - TCR Example: NPR 2-T126 0.5 Ohm 1% 100ppm Riedon Inc. 1.01 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 79