Ohmite LVK25 Industry standard size Datasheet

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 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
Schematic
V
S e r i e s S p e c i f i c at i o n s
Power
ResistanceMax. 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
characteristics
Res. Range
Operating Temp. Range
Rated Ambient Temperature
Resistance Tolerance
Temperature Coefficient
Coating Material
Terminals
Max. Over Current
Storage conditions
12
0.001Ω - 0.010Ω
-40°C to +125°C
+70°C
0.5% and 1% standard
LVK12, LVK20, LVK24: 50ppm standard
LVK25: 100ppm, 200ppm, or 300ppm based on
resistance value
epoxy resin
100% matte tin
Time applied: 10ms max.
Interval: 60sec min.
Max. over current = √(Max. power÷ Resistance
value) or max. current, whichever is smaller.
Temperature: 5°C ~ 35°C
Humidity: 25% ~ 70%
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]
V
I
I
V = sensing terminal
(voltage)
I = current terminal
LVK Series
Four Terminal High Precision Current Sense
performance characteristics
Test Items
Overload
Endurance at 70°C
Moisture
resistance
Rapid change of
temperature
Resistance to soldering heat
Performance Requirements
±(0.5%+0.0005Ω)
±(0.5%+0.0005Ω)
±(0.5%+0.0005Ω)
±(0.5%+0.0005Ω)
Test Methods / standard: JIS C 5201.1
Rated voltage x 1.5 for 5s
70°C±3°C, Rated voltage 1.5h ON, 0.5h OFF, 1000h
60°C±2°C, 90%~95% RH, Rated voltage 1.5h ON,
0.5h OFF, 1000h
-40°C (30min.)/+125°C (30min.), 5 cycles
±(0.5%+0.0005Ω)
260°C±5°C for 10s±1s
Substrate bending ±(0.5%+0.0005Ω)
Bending width: 2mm for 10s±1s, Glass epoxy substrate with thickness of 1.6mm
Solderability 95% or more of the electrode surface 245°C±5°C for 3s±0.5s
shall be covered with new solder
Reflow Temperature Profile
For lead free soldering (Sn-Ag-Cu solder)
Preheating: 130° ~ 180° 60s ~ 90s
Heating:
Over 220°
30s ~ 90s
Peak:
240° ~ 260° Max. 10s
Ramp-up rate:
Time above liquidous:
Ramp-down rate:
Max. number of reflow:
Temperature °C
300
max 3°C/sec.
60 – 150 sec.
max 6°C/sec.
2
250
200
150
100
50
dimensions
(mm)
L
LVK25
(2 watt)
W
LVK 12, LVK20, LVK24
(0.5, 0.75 & 1 watt)
L
2
W
a
4
b
Size
LVK12 (1206)
LVK20 (2010)
LVK24 (2412)
LVK25 (1224)
t
t
3
a
1
b
1. Electrode
2. Protection
coat
3. Almina
substrate
4. Resistor
L
W
t
a
b
3.2 ±0.2
1.6 ±0.2
0.5 ±0.15
1.0 ±0.2
0.55 ±0.2
2.1 ±0.2
1.2 ±0.2
5.0 ±0.2
6.4 ±0.2
3.2 ±0.2
2.5 ±0.2
3.2 ±0.2
6.4 ±0.2
0.5 ±0.15
0.5 ±0.15
0.5 ±0.2
1.7 ±0.2
0.4 ±0.2
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]
0.9 ±0.2
2.7 ±0.2
13
Peak 240 ~ 260℃ Max. 10s
Heating
Preheating
Over 220℃
30s ~ 90s
130 ~ 180℃
60 ~ 90 sec.
Time (sec.)
LVK Series
Four Terminal High Precision Current Sense
dimensions
(mm, continued)
Land Pattern
Reel
LVK25 (1224)
L
A
13mm ±0.3 (LVK12)
15mm ±0.3 (LVK 20, 24, 25)
2mm ±0.5
13mm ±�0.2
W
180mm ±3
Series
LVK12
LVK20
LVK24
LVK25
L
W
A
B
60mm ±1
B
1.75 1.10 1.00 0.30
2.55 1.55 1.40 0.50
3.25 1.90 2.00 0.60
9mm ±0.3 (LVK12)
13mm ±0.3 (LVK 20, 24, 25)
1.40 3.30 2.20 1.00
Tape
P0
T
D0
Direction
of feed
P2
A
B
E
W
F
B
W
F
E
P0
D1
T2
P1
A
P1
P2
D0
D1
T
T2
LVK12
LVK20
LVK24
LVK25
1.90 ±0.10
2.90 ±0.1
3.43 ±0.2
3.43 ±0.2
8.0 ±0.2
12.0 ±0.2
12.0 ±0.3
12.0 ±0.3
3.50 ±0.10
3.5 ±0.05
1.75 ±0.1
4.0 ±0.1
4.0 ±0.1
2.0 ±0.05
5.35 ±0.1
5.5 ±0.05
1.75 ±0.1
4.0 ±0.1
4.0 ±0.1
2.0 ±0.05
6.63 ±0.2
5.5 ±0.05
1.75 ±0.1
4.0 ±0.1
4.0 ±0.1
2.0 ±0.05
6.63 ±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 +0.1/-0
1.5 +0.1/-0
1.5 +0.1/-0
0.2 ±0.05
0.2 ±0.05
0.2 ±0.05
0.2 ±0.05
1.0 +0.20/-0
1.0 ±0.2
1.5 +0.2/-0
1.0 ±0.2
1.5 +0.2/-0
1.0 ±0.2
1.5 +0.2/-0
1.0 ±0.2
ORDERIN G IN F ORMATION
RoHS Compliant
LVK25R005FER
Series
14
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 0.025
0.03
0.03 0.03
0.033
0.033
0.039 0.039 0.039
0.047
0.047
0.05
0.05 0.05
0.075
0.075
0.10
0.10
LVK25
0.001
0.002
0.003
0.005
0.01
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LVK12 LVK20 LVK24
0.5% Tolerance
0.01
0.01 0.01
0.015 0.015
0.02
0.02 0.02
0.025 0.025
0.03
0.03 0.03
0.033
0.033
0.039
0.05
0.05 0.05
0.075
0.10
0.10
LVK25
0.001
0.002
0.003
0.005
0.010
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