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12

LVK Series

Four Terminal High Precision Current Sense

Current sense resistors enable the measurement of current flow

in a circuit by monitoring a voltage drop across a precisely cali-

brated resistance. The LVK chip features four terminals, also

known as a “Kelvin” configuration. This configuration enables

current to be applied through two opposite terminals and a

sensing voltage to be measured across the other two terminals,

eliminating the resistance and temperature coefficient of the

terminals for a more accurate current measurement.

Isolating the voltage and current terminals (see schematic)

facilitates a very accurate current measurement. Ohmite’s pro-

prietary technology offers an excellent Temperature Coefficient

of Resistance (TCR) even for very low resistance values. The

resistive element consists of a durable, anti-corrosive metal

alloy that combines reliable performance with the ability to

withstand harsh environments.

Power

Resistance

Max. Over Current

Pkg.

Rating

Range

TCR

Available

Max.

Max.

Series

Size

(W @70°C)

(Ω)

(ppm/°C)

Tolerance

Values

Power

Current

LVK12

1206

0.5W

0.01-0.100

50ppm

0.5%, 1%

E12

20W

20A

LVK20

2010

0.75W

0.01-0.05

50ppm

0.5%, 1%

E12

29W

23A

LVK24

2412

1.0W

0.01-0.100

50ppm

0.5%, 1%

E12

38W

27A

0.001

300ppm

LVK25

1224

2.0W

0.002-0.004 200ppm

1% 1, 2, 3, 5, 9,10mΩ 150W

200A

0.005-0.01

100ppm

V = sensing terminal

(voltage)

I = current terminal

VV

II

Res. Range

0.001Ω - 0.010Ω

Operating Temp. Range

-40°C to +125°C

Rated Ambient Temperature

+70°C

Resistance Tolerance

0.5% and 1% standard

Temperature Coefficient LVK12, LVK20, LVK24:

50ppm standard

LVK25:

100ppm, 200ppm, or 300ppm based on

resistance value

Coating Material

epoxy resin

Terminals

100% matte tin

Max. Over Current

Time applied: 10ms max.

Interval: 60sec min.

Max. over current = √(Max. power÷ Resistance

value) or max. current, whichever is smaller.

Storage conditions

Temperature: 5°C ~ 35°C

Humidity: 25% ~ 70%

Fea ture S

•Designedforautomatic

insertion

•Industrystandardsizes

•High-precisionKelvin

connect capability in a

small package

Serie S Speci F ication S

characteri S tic S

Schematic