Current Sense Resistors:Type SR10 and SR200 pages

Type SR Precision Current Sense Resistors

Non-inductive Design - Compact Footprint Minimizes Circuit Board Space

Kelvin Terminals (Four Wire) - Resistance Values 0.005Q to A.OOQ

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.

SR10 PACKAGE DIMENSIONS

Front view

Side view

Back view

.365 ±.020 -

(9.27 ±.51)

m

.370 ±.015

(9.40 ±.38)

- .125 ±.020

j (3.18±.51)

U- .090 (2.29)

MAX.

SR10

0.025Q

.045(1.14)

.025 (.64)

.032±.007-J L-

(.81 ±.18) 1

SR20 PACKAGE DIMENSIONS

.565 ±.020

(14.35 ±.51)

.045 (1.14)

.025

nnn

H h-

(.64) —|

.400 ±.015

(10.16 ±.38)

i

125 ±.020

)

J_(3.18±.51)

.032 ±.007 —

(.81 ±.18)

- .090 MAX.

(2.29 MAX.)

SR20

0.050Q

1%

nn

DIMENSIONS IN INCHES AND (MILLIMETERS)

CIRCUIT BOARD LAYOUT NOTES

SR10 I—, ,—

Scale:

actual size

.045

.025

SR20

100 (2.54)

_.100 (2.54)

100 (2.54)

"045(1.14)

-.025 (.64)

Section AA

.045

.025 (.64)

dm

TV

I_.101

_.200(5

s s c

( t i

in rz

. .200 (5.08)

_ 100 (2.54)

.200 (5.08)

(1.14)-|

045(1.14)

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£2

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 £2 0.020 £2 0.040 £2 0.15 £2 0.40 £2

0.010 £2 0.025 £2 0.050 £2 0.20 £2 0.50 £2

0.012 £2 0.030 £2 0.075 £2 0.25 £2 0.75 £2

0.015 £2 0.033 £2 0.10 £2 0.30 £2 1.00 £2

SR20 Standard Resistance Values:

0.005 £2 0.020 £2 0.040 £2 0.15 £2 0.40 £2

0.008 £2 0.025 £2 0.050 £2 0.20 £2 0.50 £2

0.010 £2 0.030 £2 0.075 £2 0.25 £2 0.75 £2

0.015 £2 0.033 £2 0.10 £2 0.30 £2 1.00 £2

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, AR 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,

AR ±(0.2 percent + 0.00001 ohm) max.

Thermal Shock: Mil-Std-202, Method 107, Cond. A,

AR ±(0.2 percent + 0.00001 ohm) max.

Moisture Resistance: Mil-Std-202, Method 106,

AR ±(0.2 percent + 0.00001 ohm) max.

Encapsulation: Polymer over resistance element.

Power Derating Curve:

* Power rating:

The power rating

should be limited as

shown by the derating

curve based upon the

maximum ambient TEMPERATURE,-C

temperature. The derating curve is based on still

air with natural convection around the resistor.

Ordering Information:

SR10-0.050- 1%

Model Number:-I "^Tolerance

Resistor Value:-

Applications Engineering ^^Mk Sales and Corporate Office

17271 North Umpqua Hwy. 1^*1 JL JL JV PI Pf*TBf}Mlf*G IKIf* 1717 Chicago Avenue

Roseburg, Oregon 97470-9422 ^^^**m*^J%Jm ^ CLEI fTl/fVfVsO, ffVVs. Riverside, California 92507-2364

Phone: (541) 496-0700 e-mail: caddock@caddock.com • web: www.caddock.com Phone: (951) 788-1700

Fax: (541) 496-0408 For Caddock Distributors listed by country see caddock.com/contact/dist.html Fax: (951) 369-1151

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