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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 ter-

minals 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 with-

stand harsh environments.

Power

Resistance

Pkg.

Rating

Range

TCR

Available

Series

Size

(W @70°C)

(

Ω)

(ppm/°C)

Tolerance

Values

LVK12

1206

0.5W

0.01-0.05

50ppm

0.5%, 1%

E12

LVK20

2010

0.75W

0.01-0.05

50ppm

0.5%, 1%

E12

LVK24

2412

1.0W

0.01-0.05

50ppm

0.5%, 1%

E12

0.001

300ppm

1, 2, 3, 4,

LVK25

1224

2.0W

0.002-0.004

200ppm

1%

5, 6, 7, 8,

0.005-0.01

100ppm

9, 10m

Ω

V = sensing terminal

(voltage)

I = current terminal

VV

II

Resistance Range 0.001

Ω - 0.05Ω

Operating

Temperature Range

-40°C to +125°C

Rated Ambient

Temperature

+70°C

Resistance

Tolerance

0.5% and 1% stan-

dard

Temperature

Coefficient

LVK12, LVK20, LVK24:

50ppm standard

LVK25: 100ppm,

200ppm, or 300ppm

based on resistance

value

Coating Material epoxy resin

Terminals 100% matte tin

elememt

Kelvin

ConneCtion

Fea ture S

• Designed for automatic insertion

• Industry standard sizes

• High-precision kelvin connect capabil-

ity in a small package

Serie S Speci F ication S

characteri S tic S

Schematic

per F ormance characteri S tic S

Test Items

Performance

Requirements

Test Methods

Overload ±(0.5%+0.0005

Rated voltage x 1.5 for

5s

Endurance at

70°C

±(0.5%+0.0005

70°C±3°C, Rated volt-

age 1.5h ON, 0.5h OFF,

1000h

Moisture

resistance

±(0.5%+0.0005

60°C±2°C, 90%~95%

RH, Rated voltage 1.5h

ON, 0.5h OFF, 1000h

Rapid change

of temperature

±(0.5%+0.0005

-40°C (30min.)/+125°C

(30min.), 5 cycles

Resistance to

soldering heat

±(0.5%+0.0005

260°C±5°C for 10s±1s

Substrate

bending

±(0.5%+0.0005

Bending width: 2mm for

10s±1s, Glass epoxy

substrate with thickness

of 1.6mm

Solderability 95% or more of the

electrode surface

shall be covered

with new solder

245°C±5°C for 3s±0.5s