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| Type SR Precision Current Sense Resistors Type SR Current Sense Resistors utilize Caddock's Micronox(R) resistance films to achieve a low cost resistor with Non-inductive Performance. This compact construction makes this sense resistor ideal for many current monitoring or control applications. The special performance features of these Type SR Current Sense Resistors include: * Available in Standard Resistances down to 5 milliohm. * Non-Inductive Design. * Compact footprint. Model No. SR10 SR20 Min. 0.008 0.005 Non-inductive Design - Compact Footprint Minimizes Circuit Board Space Kelvin Terminals (Four Wire) - Resistance Values 0.005 to 1.00 * Terminals are constructed for Kelvin connections to the circuit board. Resistance Max. 1.00 1.00 Power Rating at 70C 1.0 Watt 2.0 Watts * Voltage Rating Power Limited Power Limited Terminal Material Solderable Solderable SR10 Standard Resistance Values: 0.008 0.010 0.012 0.015 0.020 0.025 0.030 0.033 0.040 0.050 0.075 0.10 0.15 0.20 0.25 0.30 0.40 0.50 0.75 1.00 SR10 PACKAGE DIMENSIONS Front view .365 .020 (9.27 .51) .370 .015 (9.40 .38) .125 .020 (3.18 .51) .045 (1.14) .025 (.64) Side view .090 (2.29) MAX. Back view SR10 0.025 1% .032 .007 (.81 .18) SR20 PACKAGE DIMENSIONS .565 .020 (14.35 .51) .090 MAX. (2.29 MAX.) .400 .015 (10.16 .38) .125 .020 (3.18 .51) .032 .007 (.81 .18) SR20 0.050 1% 0.040 0.15 0.40 0.005 0.020 0.050 0.20 0.50 0.008 0.025 0.075 0.25 0.75 0.010 0.030 0.10 0.015 0.033 0.30 1.00 Custom resistance values can be manufactured for high quantity applications. Please contact Caddock Applications Engineering. Resistance Tolerance: 1.0% Temperature Coefficient: TC referenced to +25C, R taken at -15C and +105C. 0.081 to 1.00 ohm -50 to +100 ppm/C 0.025 to 0.080 ohm 0 to +150 ppm/C 0.008 to 0.024 ohm 0 to +200 ppm/C 0.005 to 0.007 ohm 0 to +300 ppm/C Load Life: 1000 hours at rated power at +70C, R (0.2 percent + 0.00001 ohm) max. Thermal Shock: Mil-Std-202, Method 107, Cond. A, R (0.2 percent + 0.00001 ohm) max. Moisture Resistance: Mil-Std-202, Method 106, R (0.2 percent + 0.00001 ohm) max. Encapsulation: Polymer over resistance element. Power Derating Curve: 100 80 * Power rating: The power rating 60 40 should be limited as 20 shown by the derating 0 curve based upon the 25 70 100 150 TEMPERATURE, C maximum ambient temperature. The derating curve is based on still air with natural convection around the resistor. SR20 Standard Resistance Values: Specifications: .045 (1.14) .025 (.64) DIMENSIONS IN INCHES AND (MILLIMETERS) CIRCUIT BOARD LAYOUT NOTES SR10 SR20 A Scale: actual size A .100 (2.54) .100 (2.54) .100 (2.54) B B .200 (5.08) .100 (2.54) .200 (5.08) .045 (1.14) .025 (.64) .045 (1.14) .045 (1.14) .025 (.64) .045 (1.14) Measurement note: For purposes of these specifications, resistance measurement shall be made using Kelvin connections (four wire) with appropriate current and sense connections to the device terminals. C = Current connection S = Sense connection Circuit Board Layout: The circuit board traces connecting to the current terminals must be sized appropriately for the current flowing through the trace. For example; 0.005 operated at 2.0 Watts would have 20 amps flowing through the circuit board traces into the current terminals. Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 (c) 2003-2007 Caddock Electronics, Inc. Section AA .025 (.64) Section BB .025 (.64) Ordering Information: Model Number: Resistor Value: SR10 - 0.050 - 1% RATED LOAD, % C SSC C SS C Tolerance e-mail: caddock@caddock.com * web: www.caddock.com For Caddock Distributors listed by country see caddock.com/contact/dist.html ELECTRONICS, INC. Sales and Corporate Office 1717 Chicago Avenue Riverside, California 92507-2364 Phone: (951) 788-1700 Fax: (951) 369-1151 28_IL126.0507 |
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