SR20-0.005-1%【PDF 1/1 页】RES 0.005 OHM 1% 2W 4-WIRE

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Type SR Precision Current Sense Resistors

Non-inductive Design - Compact Footprint Minimizes Circuit Board Space

Kelvin Terminals (Four Wire) - Resistance Values 0.005 Ω to 1.00 Ω

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.

SR10

Resistance

Min. Max.

0.008 Ω 1.00 Ω

Power Rating at

70°C

1.0 Watt

Voltage Rating

Power Limited

Terminal Material

Solderable

.025 (.64)

.090 MAX.

.025 (.64)

DIMENSIONS IN INCHES AND (MILLIMETERS)

Scale: .100 (2.54) .200 (5.08)

actual size

.100 (2.54)

C S S C

.045 (1.14)

.025 (.64)

Section AA

* Power rating:

The power rating

curve based upon the

maximum ambient

SR10 - 0.050 - 1%

SR20 0.005 Ω 1.00 Ω 2.0 Watts Power Limited Solderable

SR10 PACKAGE DIMENSIONS

Front view Side view Back view

.365 ±.020 .090 (2.29)

(9.27 ±.51) MAX.

.370 ±.015 SR10

(9.40 ±.38) 0.025Ω

.125 ±.020

(3.18 ±.51)

.045 (1.14)

.032 ±.007

(.81 ±.18)

SR20 PACKAGE DIMENSIONS

.565 ±.020

(14.35 ±.51)

(2.29 MAX.)

.400 ±.015 SR20

(10.16 ±.38) 0.050?

.125 ±.020

(3.18 ±.51)

.045 (1.14)

.032 ±.007

(.81 ±.18)

CIRCUIT BOARD LAYOUT NOTES

SR10 SR20

A A B B

.100 (2.54)

.200 (5.08)

C S S C

.045 (1.14) .045 (1.14)

.025 (.64) .025 (.64)

Section BB

Measurement note: For purposes of these specifications, resistance measurement shall

be made using Kelvin connections (four wire) with appropriate current and sense con -

nections 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 Ω

operated at 2.0 Watts would have 20 amps flowing through the circuit board traces into

the current terminals.

SR10 Standard Resistance Values:

0.008 Ω 0.020 Ω 0.040 Ω 0.15 Ω 0.40 Ω

0.010 Ω 0.025 Ω 0.050 Ω 0.20 Ω 0.50 Ω

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

SR20 Standard Resistance Values:

0.005 Ω 0.020 Ω 0.040 Ω 0.15 Ω 0.40 Ω

0.008 Ω 0.025 Ω 0.050 Ω 0.20 Ω 0.50 Ω

0.010 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

Custom resistance values can be manufactured for

high quantity applications. Please contact Caddock

Applications Engineering.

Specifications:

Resistance Tolerance: ±1.0%

Temperature Coefficient: TC referenced to

+25°C, ? R taken at -15°C and +105°C.

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 +70°C,

? 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

should be limited as 40

shown by the derating 20

25 70 100 150

TEMPERATURE, °C

temperature. The derating curve is based on still

air with natural convection around the resistor.

Ordering Information:

Model Number: Tolerance

Resistor Value:

Applications Engineering

17271 North Umpqua Hwy.

Roseburg, Oregon 97470-9422

Phone: (541) 496-0700

Fax: (541) 496-0408

? 2003-2007 Caddock Electronics, Inc.

ELECTRONICS, INC.

e-mail: caddock@caddock.com ? web: www.caddock.com

For Caddock Distributors listed by country see caddock.com/contact/dist.html

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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