Type SR Precision Current Sense Resistors Non-inductive Design - Compact Footprint Minimizes Circuit Board Space Kelvin Terminals (Four Wire) - Resistance Values 0.005 to 1.00 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. * Terminals are constructed for Kelvin connections to the circuit board. * Compact footprint. Max. Power Rating at 70C Voltage Rating Terminal Material SR10 0.008 1.00 1.0 Watt Power Limited Solderable SR20 0.005 1.00 2.0 Watts Power Limited Solderable * SR10 PACKAGE DIMENSIONS Side view Front view Back view .090 (2.29) MAX. .365 .020 (9.27 .51) SR10 0.025 1% .370 .015 (9.40 .38) .125 .020 (3.18 .51) .045 (1.14) .032 .007 (.81 .18) .025 (.64) SR20 PACKAGE DIMENSIONS .565 .020 (14.35 .51) SR20 0.050 1% .400 .015 (10.16 .38) .125 .020 (3.18 .51) .032 .007 (.81 .18) .025 (.64) CIRCUIT BOARD LAYOUT NOTES SR10 A A Scale: actual size DIMENSIONS IN INCHES AND (MILLIMETERS) SR20 C C S S C .045 (1.14) .025 (.64) .045 (1.14) .025 (.64) Section AA B B .100 (2.54) .100 (2.54) .100 (2.54) .200 (5.08) .100 (2.54) .200 (5.08) S S C .045 (1.14) .025 (.64) .045 (1.14) Section BB .025 (.64) 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. 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 SR20 Standard Resistance Values: 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. Specifications: .090 MAX. (2.29 MAX.) .045 (1.14) SR10 Standard Resistance Values: 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. RATED LOAD, % Resistance Min. Model No. Ordering Information: Model Number: Resistor Value: ELECTRONICS, INC. e-mail: caddock@caddock.com * web: www.caddock.com For Caddock Distributors listed by country see caddock.com/contact/dist.html SR10 - 0.050 - 1% Tolerance Sales and Corporate Office 1717 Chicago Avenue Riverside, California 92507-2364 Phone: (951) 788-1700 Fax: (951) 369-1151 28_IL126.0507