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LVK Series Datasheet

Four Terminal High Precision Current Sense

Res Lvk product image

Features

Designed for automatic insertion
Industry standard sizes
High-precision Kelvin connect capability in a small package

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 per formance with the ability to withstand harsh environments

Series Specifications

Pkg.Size: 0805

Power Rating (W@70°): 0.5W

Resistance Range (Ω): 0.01-0.100

TCR(ppm/°C): 50ppm

Tolerance: 1%

Available Values: 10, 15, 20, 25, 30 & 50mΩ

Max. Over Current(Max.Power): 10W

Max. Over Current(Max.Current): 10A

Pkg.Size: 1206

Power Rating (W@70°): 0.5W

Resistance Range (Ω): 0.01-0.100

TCR(ppm/°C): 50ppm

Tolerance: 0.25%, 0.5%, 1%

Available Values: E12

Max. Over Current(Max.Power): 20W

Max. Over Current(Max.Current): 20A

Pkg.Size: 2010

Power Rating (W@70°): 0.75W

Resistance Range (Ω): 0.01-0.05

TCR(ppm/°C): 50ppm

Tolerance: 0.25%, 0.5%, 1%

Available Values: E12

Max. Over Current(Max.Power): 29W

Max. Over Current(Max.Current): 23A

Pkg.Size: 2412

Power Rating (W@70°): 1.0W

Resistance Range (Ω): 0.01-0.100

TCR(ppm/°C): 50ppm

Tolerance: 0.25%, 0.5%, 1%

Available Values: E12

Max. Over Current(Max.Power): 38W

Max. Over Current(Max.Current): 27A

Pkg.Size: 1224

Power Rating (W@70°): 2.0W

Resistance Range (Ω): 0.001, 0.002-0.004, 0.005-0.01

TCR(ppm/°C): 300ppm, 200ppm, 100ppm

Tolerance: 1%, 0.25%

Available Values: 1, 2, 3, 5, 9,10mΩ, 5 & 10mΩ

Max. Over Current(Max.Power): 150W

Max. Over Current(Max.Current): 200A

Characteristics

0.001Ω - 0.100Ω

-40°C to +125°C

+70°C

0.25%, 0.5% and 1% standard

LVK08, 12, 20, 24: 50ppm standardLVK25:100ppm, 200ppm, or 300ppm based on resistance value

epoxy resin

100% matte tin

Time applied: 10ms max.Interval: 60sec min.Max.overcurrent=√(Max.power÷Resistancevalue)ormax.current,whicheverissmaller.

Temperature: 5°C ~ 35°CHumidity: 25% ~ 70%

Derating

Res Lvk Graph 1

Performance Characteristics

Performance Requirements:

±(0.5%+0.0005Ω)

Test Methods / standard: JIS C 5201.1:

Rated voltage x 1.5 for 5s

Performance Requirements:

±(0.5%+0.0005Ω)

Test Methods / standard: JIS C 5201.1:

70°C±3°C, Rated voltage 1.5h ON, 0.5h OFF, 1000h

Performance Requirements:

±(0.5%+0.0005Ω)

Test Methods / standard: JIS C 5201.1:

60°C±2°C, 90%~95% RH, Rated voltage 1.5h ON, 0.5h OFF, 1000h

Performance Requirements:

±(0.5%+0.0005Ω)

Test Methods / standard: JIS C 5201.1:

-40°C (30min.)/+125°C (30min.), 5 cycles

Performance Requirements:

±(0.5%+0.0005Ω)

Test Methods / standard: JIS C 5201.1:

260°C±5°C for 10s±1s

Performance Requirements:

±(0.5%+0.0005Ω)

Test Methods / standard: JIS C 5201.1:

Bending width: 2mm for 10s±1s, Glass epoxy substrate with thickness of 1.6mm

Performance Requirements:

95% or more of the electrode surface shall be covered with new solder

Test Methods / standard: JIS C 5201.1:

245°C±5°C for 3s±0.5s

Performance Requirements:

0

Test Methods / standard: JIS C 5201.1:

0

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: max 3°C/sec.
Time above liquidous: 60 – 150 sec.
Ramp-down rate: max 6°C/sec.
Max. number of reflow: 2

Res Lvk Graph 2

Dimensions

(mm)

LVK08, LVK12, LVK20, LVK24 (0.5, 0.75 & 1 watt)

Res Lvk Dimensions 1

Res Lvk Dimensions 2

Land Pattern

Res Lvk Land Pattern 1

1. Electrode
2. Protection coat
3. Almina substrate
4. Resistor

LVK25 (2 watt)

Res Lvk Dimensions 3

Res Lvk Dimensions 4

Land Pattern

Res Lvk Land Pattern 2

L: 2.0±0.2

W: 1.25 ±0.2

t: 0.5 ±0.15

a: 0.6 ±0.2

b: 0.4 ±0.2

d: 0.55

e: 0.4

f: 0.7

g: 1.25

L: 3.2 ±0.2

W: 1.6 ±0.2

t: 0.5 ±0.15

a: 1.0 ±0.2

b: 0.55 ±0.2

d: 1.10

e: 0.30

f: 1.00

g: 1.75

L: 5.0 ±0.2

W: 2.5 ±0.2

t: 0.5 ±0.15

a: 1.7 ±0.2

b: 0.9 ±0.2

d: 1.55

e: 0.50

f: 1.40

g: 2.55

L: 6.4 ±0.2

W: 3.2 ±0.2

t: 0.5 ±0.15

a: 2.1 ±0.2

b: 1.2 ±0.2

d: 1.90

e: 0.60

f: 2.00

g: 3.25

L: 3.2 ±0.2

W: 6.4 ±0.2

t: 0.65 ±0.20

a: 0.5 ±0.25

b: 1.85 ±0.3

d: 0.70

e: 2.30

f: 0.70

g: 3.30

Schematic

Res Lvk Schematic

Layout for illustration only, part
can be rotated 180° without
effect to the circuit

Res Lvk Image

Tape And Reel

(mm)

Tape

Res Lvk Tape

A: 1.45 ±0.10

B: 2.30 ±0.10

W: 8.00 +0.03/-0.01

F: 3.50 ±0.05

E: 1.75 ±0.10

P0: 4.00 ±0.10

P1: 4.00 ±0.10

P2: 2.00 ±0.05

D0: 1.50 +0.1/-0

D1: 1.0 +0.20/-0

T: 0.2 ±0.05

T2: 0.65 ±0.1

A: 1.90 ±0.10

B: 3.50 ±0.10

W: 8.0 ±0.2

F: 3.5 ±0.05

E: 1.75 ±0.1

P0: 4.0 ±0.1

P1: 04.0 ±0.1

P2: 2.0 ±0.05

D0: 1.5 +0.1/-0

D1: 1.0 +0.20/-0

T: 0.2 ±0.05

T2: 1.0 ±0.2

A: 2.90 ±0.1

B: 5.35 ±0.1

W: 12.0 ±0.2

F: 5.5 ±0.05

E: 1.75 ±0.1

P0: 4.0 ±0.1

P1: 4.0 ±0.1

P2: 2.0 ±0.05

D0: 1.5 +0.1/-0

D1: 1.5 +0.2/-0

T: 0.2 ±0.05

T2: 1.0 ±0.2

A: 3.43 ±0.2

B: 6.63 ±0.2

W: 12.0 ±0.3

F: 5.5 ±0.05

E: 1.75 ±0.1

P0: 4.0 ±0.1

P1: 4.0 ±0.1

P2: 2.0 ±0.05

D0: 1.5 +0.1/-0

D1: 1.5 +0.2/-0

T: 0.2 ±0.05

T2: 1.0 ±0.2

A: 3.43 ±0.2

B: 6.63 ±0.2

W: 12.0 ±0.3

F: 5.5 ±0.05

E: 1.75 ±0.1

P0: 4.0 ±0.1

P1: 4.0 ±0.1

P2: 02.0 ±0.05

D0: 1.5 +0.1/-0

D1: 1.5 +0.2/-0

T: 0.2 ±0.05

T2: 1.0 ±0.2

Reel

Res Lvk Reel

Qty/Reel: 5000

Qty/Reel: 5000

Qty/Reel: 1000

Qty/Reel: 1000

Qty/Reel: 1000

Ordering Information

Res Lvk Order Info

Standard values

Part number chart.

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