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.
Current Sense Product Selection Guide
【Power Rating and Resistance Distribution of Current Sense Shunt / Low Ohm Resistors】
※Click each product series to find the details
Motor control up to 244A and large current sensing of DC-DC converters and battery management.
| Series | Size(mm) | Resistance(Ω) | Power Rating (Current Rating) |
T.C.R. (x10-6/K) |
|---|---|---|---|---|
| PSL2 |
6.3 x 3.15 | 0.2m | 9W(212A) | 250+/-100 |
| 0.3m | 8W(163A) | +/- 175 | ||
| 0.5m | 8W(126W) | +/- 115 | ||
| PSJ2 | 10 x 5.2 | 0.2m | 12W(244A) | +/- 200 |
| 0.5m | 10W(141A) | +/- 100 | ||
| 1m | 8W(89A) | +/- 75 | ||
| 2m |
6W(54A) | +/- 75 | ||
| 3m |
5W(41A) | +/- 50 | ||
| 4m |
5W(35A) | +/- 50 | ||
| PSF4 (4-terminal) |
3.0 x 3.8 | 0.5m | 5W(100A) | +/- 50 |
| 1m | 3W(54A) | |||
| PSG4 (4-terminal) |
6.9 x 6.6 | 0.5m | 10W(141A) | +/- 50 |
| 1m | 8W(89A) |
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.
| Series | Size(mm) | Resistance(Ω) | Power Rating (Current Rating) |
T.C.R. (x10-6/K) |
|---|---|---|---|---|
| HSAN2P4015 | 40 x 15 | 0.1m | 36W (600A) |
50+/- 25 |
| 0.2m |
18W (300A) |
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
Excellent high frequency characteristics
| 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 | 0.5m to 20m | 1.5 |
| TLR 2H | 2012 | 1m to 10m | 1.0 |
| TLR2HW | 2012 | 0.5m 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.
TLR series adjusts the resistance without trimming.
1.The distribution of heat dissipation is uniformed without cutting in the resistor, leading to effective heat dissipation.
Resistors with trimming line Low Ohm Resistors - TLR series
2.Measuring errorsis corrected, caused by the inductance of the resistor itself.
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
| Series | Size(mm) | Resistance Range(Ω) | Power Rating(W) |
|---|---|---|---|
| PSB | 10 x 8.4 | 0.2m, 0.75m, 1.0m | 12.5(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. 250A current sensing available.
【Current Sense Shunt PSB series】catalog
【Current Sense Shunt PSE・PSI series】catalog
High reliable resistors under high temperature
| 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 - 200m | 1.0 |
| SLW1 | 6.3 x 3.1 | 5m - 100m | 1.5 |
| SL2 | 11.5 x 7.0 | 3m - 360m | 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 | 5.0, 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
| 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, 0.25 |
| SR73 2A | 2012 | 30m to 10 | 0.5 |
| SR73 2B | 3216 | 30m to 10 | 0.5 |
| SR73 2E | 3226 | 24m to 10 | 0.66 |
| SR73 W2H | 5025 | 33m to 10 | 0.75 |
| SR73 W3A | 6331 | 39m to 10 | 1.0 |
| SR73 W3A2 | 6331 | 39m to 10 | 2.0 |
* Power rating is based on terminal part temp. policy.
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
| Series | Size(mm) | Resistance Range(Ω) | Power Rating(W) |
|---|---|---|---|
| UR73D 1E | 1005 | 24m～100m | 0.125 |
| UR73D 1J | 1608 | 10m～100m | 0.25 |
| UR73D 2A | 2012 | 10m～30m | 0.33 |
| UR73 2A | 2012 | 33m～100m | 0.33 |
| 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
| 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 | 1 |
| UR73V 2B | 3216 | 30m to 100m |
* Power rating is based on terminal part temp. policy.
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
| Series | Size（mm） | Resistance Range（Ω） | Power Rating(W) |
|---|---|---|---|
| WK73S 2A |
1220 | 100m to 9.76 | 1.0 |
| WK73S 2B | 1632 | 10m to 9.76 | 1.0 |
| WK73S 2B15 | 1632 | 10m to 9.76 | 1.5 |
| WK73S 2H | 2550 | 10m to 9.76 | 1.0 |
| WK73S 2H2 | 2550 | 10m to 9.76 | 2.0 |
| WK73S 2J | 3246 | 10m to 9.76 | 1.0 |
| WK73S 3A | 3263 | 10m to 9.76 | 2.0 |
| WK73S 3A3 | 3263 | 10m to 9.76 | 3.0 |
* Power rating is based on terminal part temp. policy.
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
【Low Resistance WK73 series(High Power)】 catalog
Wide terminal, low TCR & high power
| Series | Size(mm) | Resistance Range(Ω) | Power Rating（W） |
|---|---|---|---|
| WU73 2B | 1632 | 10m to 100m | 1.0 |
| WU73 2B15 |
1632 | 10m to 100m | 1.5 |
Resistance 13mΩ or more and TCR±75 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
