Ultra Precision Wire-Wound Resistors Type UPW Series Key Features Custom weld tabs and copper weld leads ensure a good mechanical and electrical connection between the element and the lead wires. Protection is given to the windings by means of a layer of silicone RTV rubber. This allows movement of the windings during temperature cycling due to loads and to varying ambient temperatures. Outer protection is given by means of a hot transfer moulded epoxy compound which ensures an airtight coating with no trapped air The resistive element is wire wound onto a moulded high temperature plastic bobbin with Superior quality wire- a central former. The direction of winding is reversed part way through the winding, wound resistors with very giving very low values of inductance. These Neohm resistors use bobbin assemblies with low selection tolerances flattened lead ends, providing high resistance to pull, vibration and torsional forces and temperature coefficients down to 1 ppm. during handling, assembly and life. 3 case sizes are available. T/C, ratio and pair Characteristics - Electrical matching is available and customer specifications UPW15 UPW25 UPW30 UPW50 are welcome. These Rated Power 125C (W) 0.125 0.25 0.3 0.5 Derate to zero at 145C components exhibit high stability under load and Resistance Range (Ohms) Min R10 R10 R10 R10 severe environmental Max 300K 1M0 1M0 2M0 conditions Tolerance (%) 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 Code Letter E L P W B A D F Limiting Element Voltage (V) 150 300 150 400 Temp. Coefficient (ppm/C) Typ. 3 (0C to +85C) Max. 5 (-55C to +125C) 1 available on request Operating Temperature Range (C) -55 to +145 Long Term Stability (Load) < 50 ppm 10,000 hrs < 100ppm 26,000 hrs Thermal EMF < 0.2 V /C Dimensions - Style A Style B Type Style L 0.4 D 0.4 W 0.5 s 0.2 d nom UPW15 A 6.35 3.18 - - 0.64 UPW25 A 9.53 4.75 - - 0.64 UPW30 B 7.62 7.62 3.18 3.81 0.64 UPW50 A 12.7 6.35 - - 0.81 1773299 CIS BI 03/2012 Dimensions are in millimeters Dimensions are shown for For email, phone or live chat, go to: te.com/help and inches unless otherwise reference purposes only. specified. Values in brackets Specifications subject are standard equivalents. to change.Ultra Precision Wire-Wound Resistors Type UPW Series Derating Curve 100 1%, 0.5%, 0.2%, 0.1% 80 0.05% 60 0.02% 0.01% 40 20 0.005% 0 40 60 80 100 120 140 160 Ambient Temperature (C) UPW Series resistors must be derated for tolerances below 0.1%. Use the graph to select tolerance versus operating temperature to determine the percentage rated power for operation. No derating is required for operation below 20 C. Mounting The resistors are suitable for processing on automatic insertion equipment and cutting and bending machines. Marking The resistors are marked with the following information:- Manufacturer s name, type number, value and tolerance, four figure date code. Packaging UPW Series resistors are packed loose in boxes. Performance Characteristics The evaluation of the performance characteristics is carried out with reference to IEC specifications QC 400 000 and QC 400 100. TEST REF Long Term Tests (0.25% + 0.05 ohm) 4.23 Climatic sequence 4.24 Damp heat, steady state 4.25.1 Endurance at 70 C 4.25.3 Endurance at 145 C TEST REF Short Term Tests (0.1% + 0.01 ohm) 4.13 Overload 4.16 Robustness of terminations 4.18 Resistance to soldering heat 4.19 Rapid change of temperature 4.22 Vibration All resistance values are measured at a distance of 9.53mm (0.375 inch) from the end cap. How to Order Orders for these components should include the following information:- Type, tolerance code letter and value e.g. UPW30 L 1K15 TE Connectivity, TE connectivity (logo) and TE (logo) are trademarks. Other logos, product and Company names mentioned herein may be trademarks of their respective owners. While TE has made every reasonable effort to ensure the accuracy of the information in this datasheet, TE does not guarantee that it is error-free, nor does TE make any other representation, warranty or guarantee that the information is accurate, correct, reliable or current. TE reserves the right to make any adjustments to the information contained herein at any time without notice. TE expressly disclaims all implied warranties regarding the information contained herein, including, but not limited to, any implied warranties of merchantabili- ty or fitness for a particular purpose. The dimensions in this datasheet are for reference purposes only and are subject to change without notice. Specifications are subject to change without notice. Consult TE for the latest dimensions and design specifications. Percent Rated Power