LVK20R050DER Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Four Terminal High Precision Current Sense

Elememt
Kelvin
Connection
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.
F e at u r e s
• Designed for automatic insertion
• Industry standard sizes
• High-precision kelvin connect capabil-
ity in a small package
Series
LVK12
LVK20
LVK24
LVK25
Pkg.
Size
1206
2010
2412
1224
Series Specifications
Power
Rating
(W @70°C)
0.5W
Resistance
Range
(Ω)
0.01-0.05
TCR
(ppm/°C) Tolerance
50ppm
0.5%, 1%
0.75W
0.01-0.05
50ppm
0.5%, 1%
1.0W
0.01-0.05
50ppm
0.5%, 1%
2.0W
0.001
0.002-0.004
0.005-0.01
300ppm
200ppm
1%
100ppm
Available
Values
E12
E12
E12
1, 2, 3, 4,
5, 6, 7, 8,
9, 10mΩ
characteristics
Resistance Range 0.001Ω - 0.05Ω
Operating -40°C to +125°C
Temperature Range
Rated Ambient +70°C
Temperature
Resistance 0.5% and 1% stan-
Tolerance dard
Temperature LVK12, LVK20, LVK24:
Coefficient 50ppm standard
LVK25: 100ppm,
200ppm, or 300ppm
based on resistance
value
Coating Material epoxy resin
Terminals 100% matte tin
Schematic
V
V
I
I
V = sensing terminal
(voltage)
I = current terminal
performance characteristics
Performance
Test Items Requirements
Test Methods
Overload ±(0.5%+0.0005Ω) Rated voltage x 1.5 for
5s
Endurance at ±(0.5%+0.0005Ω)
70°C
70°C±3°C, Rated volt-
age 1.5h ON, 0.5h OFF,
1000h
Moisture ±(0.5%+0.0005Ω)
resistance
60°C±2°C, 90%~95%
RH, Rated voltage 1.5h
ON, 0.5h OFF, 1000h
Rapid change ±(0.5%+0.0005Ω) -40°C (30min.)/+125°C
of temperature
(30min.), 5 cycles
Resistance to ±(0.5%+0.0005Ω) 260°C±5°C for 10s±1s
soldering heat
Substrate ±(0.5%+0.0005Ω)
bending
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
2
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