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KOA Corporation > Product > High precision | Low inductance | Large current type Current Sense Shunt series -Various kinds of lineup!

High precision | Low inductance | Large current type Current Sense Shunt series -Various kinds of lineup!

The first step of power management of electronic devices is to measure the current. To measure correctly and efficiently, you need to select suitable current sense resistors for your application. Once you read this page, you can soon find your answer among KOA products offering from thick film chip construction to metal plate construction shunt.

KOA's Currnet Sense Shunt / Low Ohm Resistors

【Power Rating and Resistance Distribution of Current Sense Shunt / Low Ohm Resistors】

※Click each product series to find the details

KOA's shunt products lineup

Low Ohm Resistor WU73 Low Ohm Resistor WK73 Current Sense Shunt TLRH Current Sense Shunt SL, TSL, SLN Low Ohm Resistor SR73 Low Ohm Resistor UR73V Low Ohm Resistor UR73 Current Sense Shunt TLR Current Sense Shunt PSB, PSE, PSI Current Sense Shunt PSJ, PSG, PSL, PSF Current Sense Shunt HS
Circuit example

Features of Current Sense Shunt / Low Ohm Resistors

Motor control up to 245A and large current sensing of DC-DC converters and battery management.

PSJ2/PSL2/PSG4/PSF4 

KOA Power Shunt PSJ/PSG

Series Size(mm) Resistance(Ω) Power Rating(W) T.C.R.
(x10-6/K)
PSL2* 6.3 x 3.15 0.3m 8 +/- 175
0.5m +/- 115
PSJ2 10 x 5.2 0.2m 12 +/- 200
0.5m 10 +/- 100
1m 8 +/- 75
2m* 6 +/- 75
PSF4
(4-terminal)
3.0 x 3.8 0.5m 5 +/- 50
1m 3
PSG4
(4-terminal)
6.9 x 6.6 0.5m 10 +/- 50
1m 8
*Under Development.

Power rating 12W max. achieved. Both 2- and 4- terminal constructions in our new product lineup. PSG4 and PSF4, 4-terminal construction type, enables high precision performance by T.C.R.+/- 50x10-6/K.

[Power Shunt PSJ2/PSL2 series]catalog
[Power Shunt  PSG4/PSF4 series]catalog

 
 
Motor control up to 600A and extremely large current sensing of DC-DC converters and battery management.

HS Series

KOA Current Shunt HS

Series Size(mm) Resistance(Ω) Power Rating(W) T.C.R.
(x10-6/K)
HSAN2P4015 40 x 15 0.1m 36 50+/- 25
0.2m 18

High current sensing possible even at low resistance 0.1mΩ, by voltage detecting terminals. Custom configuration available by various way of attachment.

【High Power Shunt HS Series】 catalog

 
 

Indispensable for current sensing of high speed operating inverters and CPU
Excellent high frequency characteristics

TLR series


TLR Construction
Series Size(inch) Resistance Range(Ω) Power Rating(W)
TLR 2BN 1206 1m to 20m 0.5
TLR 2B
TLR2BW 1206 1m to 20m 1.0
TLR2BP 1206 1m to 20m 1.5
TLR 2H 2012 1m to 10m 1.0
TLR2HW 2012 1m to 10m 2.0
TLR 3A 2512 1m to 4m 1.0
TLR 3AW 2512 0.5m to 10m 2.0
TLR 3AP 2512 0.5m to 10m 3.0
TLR 3APS 2512  2m, 3m 3.0

The manufacturing process of resistors includes "trimming" process where the partial resistive body is cut to adjust the resistance. This trimming process would not cause any problem in the normal circuit, while it does cause various problem in the high speed circuit under large current, like CPU power supplies of PCs.
TLR series adjusts the resistance without trimming.

[TLR - Heat dissipation distribution]

1.The distribution of heat dissipation is uniformed without cutting in the resistor, leading to effective heat dissipation.

See more details

Resistors with trimming line
Low Ohm Resistors - TLR series

[Detected Waveform]

2.Measuring errorsis corrected, caused by the inductance of the resistor itself.

See more details

Resistors with trimmed
Low resistors TLR series

【Current Sense Shunt TLR series】catalog
【Current Sense Shunt TLR series(high power)】catalog


High precision sensing of large current

PS series

PS series PSB構造図
PSI・PSE構造図
Series Size(mm) Resistance Range(Ω) Power Rating(W)
PSB 10 x 8.4 0.2m, 0.75m, 1.0m 7(0.2m), 6
PSE 6.4 x 6.4 0.5m, 1.0m, 1.5m, 2.0m 3.0, 5.0
PSI 10 x 5.2 3m, 4m 3.0

Same construction of TLR, good high frequency characteristics. The stress of heat cycle is improved by the original shape pf PSB. PSE series achieves high power up to 5W in small size. KOA's lowest resistance 0.2mΩ and max. 187A current sensing available.

【Current Sense Shunt PSB series】catalog
【Current Sense Shunt PSE・PSI series】catalog

High reliable resistors under high temperature

SL・TSL・SLN Series

低抵抗器|SL|TSL 低抵抗器|SL|TSL
低抵抗器|SL|TSL

Series Size(mm) Resistance Range(Ω) Power Rating(W)
SL07 5.0 x 2.5 5m - 100m 0.75
SLW07 5.0 x 2.5 5m - 100m 1.0
TSL1 6.3 x 3.1 5m - 100m 1.0
SL1 6.3 x 3.1 3m - 22M 1.0
SLW1 6.3 x 3.1 5m - 100m 1.5
SL2 11.5 x 7.0 3m - 22M 2.0
SLN2 11.5 x 7.0 5m - 200m 2.0
SLN3 11.5 x 7.0 5m - 110m 3.0
SLN5 11.5 x 7.0 3m - 200m 7.0

Resistive body molded by flame retardant resin, strong to temperature change and endurance. The terminals apply metal plate, which offers terminal strength and solderability. Wide operating temperature range from -55°C to +180°C, suitable for electronic devices under automotive environment.

【Current Sense Shunt SL・TSL・SLN series】catalog
【Current Sense Shunt SL(High power type) series】catalog

 
 

Various size and power ratings. Selectable like general-purpose flat chip

SR73 series

low resistance resistor|SR73 low resistance resistor|SR73
low resistance resistor|SR73
low resistance resistor|SR73
Series Size(mm) Resistance Range(Ω) Power Rating(W)
SR73 1H 0603 180m to 10 0.1
SR73 1E 1005 100m to 10 0.166
SR73 1J 1608 100m to 10 0.2
SR73 2A 2012 30m to 10 0.33, 0.5
SR73 2B 3216 30m to 10 0.33, 0.5
SR73 2E 3226 24m to 10 0.5, 0.66
SR73 W2H 5025 33m to 10 0.75
SR73 W3A 6331 39m to 10 1.0, 2.0

SR73 1H is small type chip resistors, size 0.6mm x 0.3mm. Mountable on high density mounting devices like mobile phones, PDC and HDD.
Applicable to various scenes like remain level detection of secondary battery and overcurrent protection circuit.

【Low Resistance SR73 series】catalog

Low resistance under 100mΩ and realizes high precision

UR73 series

低抵抗器|UR73構造図 低抵抗器|UR73
低抵抗器|UR73
低抵抗器|UR73
Series Size(mm) Resistance Range(Ω) Power Rating(W)
UR73D 1E 1005 24m~100m 0.125
UR73D 1J 1608 10m~100m 0.2
UR73D 2A 2012 10m~30m 0.25
UR73 2A 2012 33m~100m 0.25
UR73D 2B 3216 10m~27m 0.5
UR73 2B 3216 30m~100m 0.5
UR73D 2H 5025 10m~100m 0.75
UR73D 3A 6331 10m~100m 1.0

Resistance: 10mΩ~100mΩ & TCR:±100 x 10-6/K. Tolerance: ±1% is standard for this high precision resistors.
Works excellent in the circuits like battery charge circuit, requiring low resistance(10mΩ~) and high power( up to 1W).

【Low Resistance UR73 series】 catalog

Low resistance under 100mΩ and realizes high precision
high heat resistance and high reliability type

UR73V series

UR73V/UR73VD  UR73V/UR73VD construction
Series Size(mm) Resistance Range(Ω) Power Rating(W)
UR73VD 2A 2012 10m to 36m 0.5
UR73V 2A
39m to 100m
UR73VD 2B 3216 10m to 27m 0.5, 0.75
UR73V 2B 3216 30m to 100m

Resistance: 10mΩ ~ 100mΩ and T.C.R.:±75 x 10-6/K achieved. Conventionally up to +125°C, but now +155°C is available. Suitable for current sensing purposes  including information system, body control system and safety driving of automotive applications.

【Low Resistance UR73V series】 catalog

 
 

Wide terminal type and high power

WK73 series

WK73 WK73 construction
Series Size(mm) Resistance Range(Ω) Power Rating(W)
WK73S 2B 1632 10m~9.76 0.75,1.0
WK73S 2H 2550 10m~9.76 1.0, 2.0
WK73S 2J 3246 10m~9.76 1.0
WK73S 3A 3263 10m~9.76 1.5, 3.0

Wide terminals achieves high power in small size. Max. double high power rating of SR73 in same size. Excellent heat cycle, and suitable for devices requiring reliability such as automotive purposes.

【Low Resistance WK73 series】 catalog

Wide terminal, low TCR & high power

WU73 series


WU73 WU73 construction
Series Size(mm) Resistance Range(Ω) Power Rating(W)
WU73 2B 1632 10m to 100m 1.0

Resistance 13mΩ or more and TCR±100 x 10-6/K is achieved. Wide terminals achieves high power in small size. Excellent heat cycle, and suitable for devices requiring reliability such as automotive purposes

【Low Resistance WU73 series】 catalog

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