Ohmite LVK12 Four terminal high precision current sense Datasheet

Elememt
Kelvin
Connection
LVK Series
Four Terminal High Precision Current Sense
Current
Sense
Current sense resistors enable the measurement of current flow
in a circuit by monitoring a voltage drop across a precisely calibrated 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 proprietary 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.
F e at u r e s
• Designed for automatic insertion
• Industry standard sizes
• High-precision kelvin connect capability in a small package
S e r i e s S p e c i f i c at i o n s
Series
LVK12
LVK20
LVK24
Pkg.
Size
1206
2010
2412
Power
Rating
(W @70°C)
0.5W
0.75W
1.0W
LVK25
1224
2.0W
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% stanTolerance 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
TCR
(ppm/°C)
Tolerance
50ppm
0.5%, 1%
50ppm
0.5%, 1%
50ppm
0.5%, 1%
300ppm
200ppm
1%
100ppm
Available
Values
E12
E12
E12
1, 2, 3, 4,
5, 6, 7, 8,
9, 10mΩ
performance characteristics
Performance
Test Items Requirements
Overload ±(0.5%+0.0005Ω)
Test Methods
Rated voltage x 1.5 for
5s
Endurance at ±(0.5%+0.0005Ω)
70°C
70°C±3°C, Rated voltage 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)
of temperature
-40°C (30min.)/+125°C
(30min.), 5 cycles
Resistance to ±(0.5%+0.0005Ω)
soldering heat
260°C±5°C for 10s±1s
Substrate ±(0.5%+0.0005Ω)
bending
V
I
I
V = sensing terminal
(voltage)
I = current terminal
2
Resistance
Range
(Ω)
0.01-0.05
0.01-0.05
0.01-0.05
0.001
0.002-0.004
0.005-0.01
Bending width: 2mm for
10s±1s, Glass epoxy
substrate with thickness
of 1.6mm
Solderability 95% or more of the 245°C±5°C for 3s±0.5s
electrode surface
shall be covered
with new solder
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]
Elememt
Kelvin
Connection
LVK Series
Four Terminal High Precision Current Sense
Current
Sense
dimensions
(mm)
L
Land Pattern
LVK25
(2 watt)
W
LVK 12, LVK20, LVK24
(0.5, 0.75 & 1 watt)
L
2
LVK12 (1206)
LVK20 (2010)
LVK24 (2412)
A
�
Series
LVK12
LVK20
LVK24
LVK25
a
t
3
1
Size
LVK12 (1206)
LVK20 (2010)
LVK24 (2412)
LVK25 (1224)
L
3.2 ±0.2
5.0 ±0.2
6.4 ±0.2
3.2 ±0.2
W
1.6 ±0.2
2.5 ±0.2
3.2 ±0.2
6.4 ±0.2
b
1. Electrode
2. Protection
coat
3. Almina
substrate
4. Resistor
�
B
t
0.5 ±0.15
0.5 ±0.15
0.5 ±0.15
0.5 ±0.2
L
1.75
2.55
3.25
1.40
W
1.10
1.55
1.90
3.30
A
1.00
1.40
2.00
2.20
B
0.30
0.50
0.60
1.00
W
�
�
�
�
a
1.0 ±0.2
1.7 ±0.2
2.1 ±0.2
0.4 ±0.2
b
0.55 ±0.2
0.9 ±0.2
1.2 ±0.2
2.7 ±0.2
P0
T
D0
13mm ±0.3 (LVK12)
15mm ±0.3 (LVK 20, 24, 25)
13mm ± 0.2
180mm ±3
60mm ±1
9mm ±0.3 (LVK12)
13mm ±0.3 (LVK 20, 24, 25)
Direction
of feed
P2
E
F
A
B
W
F
E
P0
P1
P2
D0
D1
T
T2
B
D1
T2
LVK12
1.90 ±0.10
3.50 ±0.10
8.0 ±0.2
3.5 ±0.05
1.75 ±0.1
4.0 ±0.1
4.0 ±0.1
2.0 ±0.05
1.5 +0.1/-0
1.0 +0.20/-0
0.2 ±0.05
1.0 ±0.2
P1
LVK20
2.90 ±0.1
5.35 ±0.1
12.0 ±0.2
5.5 ±0.05
1.75 ±0.1
4.0 ±0.1
4.0 ±0.1
2.0 ±0.05
1.5 +0.1/-0
1.5 +0.2/-0
0.2 ±0.05
1.0 ±0.2
RoHS Compliant
LVK25R005FER
LVK24
3.43 ±0.2
6.63 ±0.2
12.0 ±0.3
5.5 ±0.05
1.75 ±0.1
4.0 ±0.1
4.0 ±0.1
2.0 ±0.05
1.5 +0.1/-0
1.5 +0.2/-0
0.2 ±0.05
1.0 ±0.2
4
Case Size
12 = 1206
20 = 2010
24 = 2412
25 = 1224
Tolerance Taping Code
Ohms
R005 = 0.005 D = 0.5% R = 1,000 pc/reel
F = 1%
Standard values
LVK12 LVK20 LVK24
1% Tolerance
0.01
0.01 0.01
0.012
0.012
0.015 0.015
0.02
0.02 0.02
0.024 0.027
0.03
0.03 0.03
0.039
0.039
0.047
0.047
0.05
0.05 0.05
LVK25
0.001
0.002
0.003
0.005
0.01
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]
W
A
ORDERIN G IN F ORMATION
Series
B
Tape
Reel
2mm ±0.5
W
�
t
4
b
L
�
W
a
LVK25 (1224)
A
L
LVK12 LVK20 LVK24
0.5% Tolerance
0.01
0.01 0.01
0.02
0.02 0.02
0.03
0.03 0.03
0.05
0.05 0.05
LVK25
3.43 ±0.2
6.63 ±0.2
12.0 ±0.3
5.5 ±0.05
1.75 ±0.1
4.0 ±0.1
4.0 ±0.1
2.0 ±0.05
1.5 +0.1/-0
1.5 +0.2/-0
0.2 ±0.05
1.0 ±0.2
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