NPR NPP T126 Powertron * * * * * * * 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 ( <50nH ) SPECIFICATIONS Type NPR 2-T126 NPP 2-T126 Power Rating Heatsink1 Free Air2 20W 5W 1W 0.5W Resistance Range3 Thermal Resistance Min 5.9K/W 0.01W 6.0K/W 0.1W Tolerances Temperature Coefficients 51KW 1% ( R > 0.1W ) 5% 50ppm/K ( R>10W ) 100ppm/K ( R>0.1W ) 250ppm/K 51KW 0.05% / 0.1% / 0.25% ( R > 5W ) 0.5% ( R > 1W ) / 1% ( R > 0.1W ) 2% / 5% 5 / 10ppm/K ( R>1W ) 25ppm/K ( R>0.1W ) 100ppm/K Max 1 Power rating based on 25C Flange Temperature Power rating based on 25C Ambient Temperature 3 Consult Factory for Higher or Lower Values 2 Specification Value Maximum Current 25A Temperature Range -55C to +155C : NPP 2T126 -55C to +120C : NPR 2-T126 Dielectric Strength 2000 VAC Max. Operating Voltage 500 V Insulation Resistance >1000 Meg-Ohm Environmental Performance DR Test Conditions Load Life 1% 25C / 90 min ON / 30 min OFF / 1000 hr Humidity Resistance 1% 40C / 90-95% RH / DC 0.1W / 1000 hr Temperature Cycle 0.25% -55C for 30 min / +155C for 30 min / 1000 hr Solder Heat 0.1% +350C / 3s Vibration 0.25% Document Number: 64330 Revision: 20-09-10 For technical questions, contact: powertron@vishaypg.com www.powertron.de 1 NPR NPP T126 Powertron SPECIFICATIONS (continued) Power Rating Notes - Power Derating Curve The NPR 2-T126 Series Foil Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 155C (120C for the NPP 2-T126). 120 Power ( % ) 100 80 60 R NP P 40 20 0 NP 2- To specify an appropriate heatsink use the following formula : 2-T RqH = TMAX - ( P x RqR ) - TA P 12 T1 6 26 Where: -25 0 25 50 75 100 125 150 175 Ambient Temperature (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 ) 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 www.powertron.de 2 For technical questions, contact: powertron@vishaypg.com Document Number: 64330 Revision: 20-09-10 Legal Disclaimer Notice Vishay Precision Group Disclaimer ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE. Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay Precision Group"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. The product specifications do not expand or otherwise modify Vishay Precision Group's terms and conditions of purchase, including but not limited to, the warranty expressed therein. Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase. 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No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any conduct of Vishay Precision Group. The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay Precision Group products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay Precision Group for any damages arising or resulting from such use or sale. Please contact authorized Vishay Precision Group personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document No.: 63999 Revision: 27-Apr-11 www.vishaypg.com 1