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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.

12/17/12

metal plate current sense resistors

Standard

Resistance**

Part

Designation

Rated

Ambient

Temperature

Operating

Temperature

Range

Power

Rating*

T.C.R.

(ppm/°C)

Max.

applications and ratings

LR72A

LR72B

LR72C

1/2W

1/4W

1W

±100

±350

2mΩ ~ 8mΩ

2mΩ, 3mΩ

3mΩ ~ 5mΩ

+70°C

+85°C

-40°C to +180°C

Resistance

Tolerance

J: ±5%

Derating Curve

environmental applications

100

80

60

40

20

-40

0

4080120

Ambient Temperature

(°C)

0

70

160

180

200

155

85

LR72C

LR72A, 72B

Performance Characteristics

-40°C to +155°C

Parameter

Requirement ∆ R ±%

Limit

Typical

Test Method

Resistance

25°C

Within specified

tolerance

––

T.C.R.

Room temp. +100°C UP

Within specified

T.C.R.

––

Resistance to

Soldering Heat

350°C ± 10°C, 3 seconds

±2.0%

±1.6%

Moisture Resistance

Power rating x 1/10, 40°C, 90% - 95% RH, 1000 hours,

1.5 hr ON, 0.5 hr OFF cycle

±5.0%

±4.5%

Endurance at 70°C

Rated voltage 70°C, 1000 hours

1.5 hr ON, 0.5 hr OFF cycle

±5.0%

±4.5%

* Rated power in case of glass epoxy resin (FR-4) is used for the substrate material

** Please contact factory for custom made resistance values

For resistors operated at an ambient temperature of 70°C

or above, a power rating shall be derated in accordance

with the above derating curve.