Type SR Precision Current Sense Resistors Non-inductive Design - Compact Footprint Minimizes Circuit Board Space Kelvin Terminals (Four Wire) - Resistance Values 0.005Ω to 1.00Ω Type SR Current Sense Resistors utilize Caddock's Micronox® 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. Model No. Resistance Power Rating at Voltage Rating Terminal Material Min. Max. 70°C* SR10 0.008 Ω 1.00 Ω 1.0 Watt Power Limited Solderable SR20 0.005 Ω 1.00 Ω 2.0 Watts Power Limited Solderable SR10 Standard Resistance Values: 0.008 Ω 0.020 Ω 0.040 Ω 0.15 Ω 0.40 Ω SR10 PACKAGE DIMENSIONS 0.010 Ω 0.025 Ω 0.050 Ω 0.20 Ω 0.50 Ω Front view Side view Back view 0.012 Ω 0.030 Ω 0.075 Ω 0.25 Ω 0.75 Ω 0.015 Ω 0.033 Ω 0.10 Ω 0.30 Ω 1.00 Ω .365 ±.020 .090 (2.29) (9.27 ±.51) MAX. SR20 Standard Resistance Values: (.397.400 ± ±.0.3185) 0S.0R2150Ω 0.005 Ω 0.020 Ω 0.040 Ω 0.15 Ω 0.40 Ω 1% 0.008 Ω 0.025 Ω 0.050 Ω 0.20 Ω 0.50 Ω .125 ±.020 0.010 Ω 0.030 Ω 0.075 Ω 0.25 Ω 0.75 Ω (3.18 ±.51) 0.015 Ω 0.033 Ω 0.10 Ω 0.30 Ω 1.00 Ω .045 (1.14) .025 (.64) (.0.8312 ±±..1080)7 Custom resistance values can be manufactured for high quantity applications. Please contact Caddock SR20 PACKAGE DIMENSIONS Applications Engineering. .565 ±.020 (14.35 ±.51) .090 MAX. Specifications: (2.29 MAX.) .400 ±.015 SR20 Resistance Tolerance: ±1.0% (10.16 ±.38) 0.050Ω 1% Temperature Coefficient: TC referenced to (.132.158 ± ±.0.5210) +25°C, ∆R taken at -15°C and +105°C. .045 (1.14) 0.081 to 1.00 ohm -50 to +100 ppm/°C .025 (.64) .(0.3821 ±±..01087) DIMENSIONS IN INCHES AND (MILLIMETERS) 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 CIRCUIT BOARD LAYOUT NOTES Load Life: 1000 hours at rated power at +70°C, SR10 SR20 ∆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. A A B B M∆Ro i±s(t0u.r2e pReercseisntta +n c0e.0: 0 M00il1-S otdh-m20) 2m, aMxe.thod 106, acStucaal lesi:ze .100.1 (020..51 (402)0.5 (42).54) .200.1 (050..02 (802)0.5 (45).08) PEonwcaepr sDuelraattiinogn :C uProvley:mer over resistance element. C SS C C S S C *Power rating: %18000 ..004255 ((1.6.144) )Section AA.0.4052 5(1 (..1644)) ..004255 ((1.6.144)) Section BB.0.4052 5(1 (..1644)) Tsshhhooewu nldp bobywe t heleirm dirteearadtti innaggs RATEDLOAD, 246000 curve based upon the 0 25 70 100 150 Measurement note: For purposes of these specifications, resistance measurement shall maximum ambient TEMPERATURE, °C be made using Kelvin connections (four wire) with appropriate current and sense con- temperature. The derating curve is based on still n ections to the device terminals. air with natural convection around the resistor. C = Current connection S = Sense connection Ordering Information: 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; 0.005Ω SR10 - 0.050 - 1% operated at 2.0 Watts would have 20 amps flowing through the circuit board traces into Model Number: Tolerance the current terminals. Resistor Value: Sales and Applications Engineering ELECTRONICS, INC. 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 e-mail: caddock@caddock.com • web: www.caddock.com Phone: (541) 496-0700 For Caddock Distributors listed by country see caddock.com/contact/dist.html Fax: (541) 496-0408 © 2003-2017 Caddock Electronics, Inc. 28_IL126.01717