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KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com

Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.

12/16/08

SR73

lo-ohm 0.5%, 1%, 2%, 5% tolerance thick film

current sense resistor

* Parenthesis indicate EIA package size codes.

** See Appendix D for available decade values.

*** 1H, 1E (F: ±1%) E-24 values only.

1

Please contact factory for limitation of Surface Mount Temp. Rise

Absolute

Maximum

Working

Voltage

E-24, E-96

(F±1%)

E-24

(G±2%)

E-24

(J±5%)

Part

Designation*

Maximum

Overload

Voltage

(5 Secs. Max.)

Operating

Temperature

Range

Power

Rating

@ 70°C

applications and ratings

SR731E

(0402)

SR731J

(0603)

0.51

Ω - 10Ω***

0.2

Ω - 0.47Ω***

0.1

Ω - 0.18Ω***

0.51

Ω - 10Ω

0.2

Ω - 0.47Ω

0.1

Ω - 0.18Ω

0.1

Ω - 10Ω

0.1

Ω - 10Ω

0.1

Ω - 10Ω

0.51

Ω - 10Ω

0.2

Ω - 0.47Ω

1.11V

2.79V

1.41V

3.53V

0.1

Ω - 0.18Ω

±200

±300

1/8W (.125W)

1/5W (.2W)

SR732A

(0805)

1.58V

3.95V

1/4W (.25W)

±500

±200

Resistance Range**

T.C.R.

(ppm/°C)

Max.

-55°C

to

+150°C

-55°C to

+125°C

0.1

Ω - 10Ω

—

±100

—

—

0.1

Ω - 10Ω

±200

0.1

Ω - 10Ω

—

—

±500

0.051

Ω - 0.091Ω

—

—

±800

0.030

Ω - 0.047Ω

SR732B

(1206)

1.81V

4.54V

1/3W (.33W)

0.1

Ω - 10Ω

—

±100

—

—

0.1

Ω - 10Ω

±200

0.1

Ω - 10Ω

—

—

±500

0.056

Ω - 0.091Ω

—

—

±800

0.030

Ω - 0.051Ω

SR732H/W2H

(2010)

2.73V

6.84V

3/4W (.75W)

0.1

Ω - 10Ω

—

±100

—

—

0.1

Ω - 10Ω

±200

0.1

Ω - 10Ω

—

—

±500

0.056

Ω - 0.091Ω

—

—

±800

0.033

Ω - 0.051Ω

SR733A/W3A

(2512)

3.16V

7.90V

1W

0.1

Ω - 10Ω

—

±100

—

—

0.1

Ω - 10Ω

±200

0.1

Ω - 10Ω

—

—

±500

0.056

Ω - 0.091Ω

—

—

±800

0.039

Ω - 0.051Ω

SR732E

(1210)

2.23V

5.59V

1/2W (.5W)

0.1

Ω - 10Ω

—

±100

—

—

0.1

Ω - 10Ω

±200

0.047

Ω - 10Ω

—

—

±500

0.036

Ω - 0.043Ω

—

—

±1000

0.024

Ω - 0.033Ω

Derating Curve

Performance Characteristics

Surface Temperature Rise

environmental applications

100

80

60

40

20

-60

-40

0

406080100160

70

20

Ambient Temperature

(°C)

0

-55

120

125

-20

140

150

1H

1E, 1J,

2A, 2B, 2E,

2H, 3A,

W2H, W3A

180

160

120

80

40

25

50

75

100

% Rated Power

W3A (1W)

W2H (.75W)

2E (.5W)

2A (.25W)

)

0

0

140

100

60

20

2E (.66W)

2B (.5W)

2A (.33W)

1J (.2W)

1E (.166W)

2B (.33W)

Measuring Point

1E (.125W

1H (.1W)

PMS 300 neg.

Black neg.

E-24, E-96

(D±0.5%)

—

—

—

—

SR731H

(0201)

1

Ω - 10Ω

—

0.47

Ω - 10Ω

1.0V

2.5V

0.1W

0~ ±400

—

0.15

Ω - 10Ω

—

—

—

0.15

Ω - 10Ω

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Parameter

Requirement ∆ R

Limit

Typical

Test Method

Resistance

T.C.R.

25°C

+25°C/-55°C and +25°C/+125°C

Within specified

tolerance

Within specified

T.C.R.

—

—

Overload (Short time)

Rated Voltage x 2.5 for 5 seconds

±2%

±0.5%

Resistance to Solder Heat

260°C ± 5°C, 10 seconds ± 1 second

±3%*, ±1%**

±0.75%*, ±0.3%**

Rapid Change of Temperature

-40°C (30 minutes), +125°C (30 minutes), 100 cycles

±1%

±0.3%

Moisture Resistance

40°C ± 2°C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle

±3%*, ±2%**

±1%

Endurance at 70°C

70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle

±3%*, ±2%**

±1%

High Temperature Exposure

1H: +125°C, 1000 hours; 1E, 1J, 2A, 2B, 2E, W2H, W3A:+155°C, 1000 hours

±1%

±0.3%

* 1H

** 1E~W3A

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4:04 PM

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