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ACS72981 Current Sensor Compact Carriers
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We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS72981xLR Hall effect-based, electrically isolated current sensors. The following list details some of the sensor’s key features:
- Hall effect-based sensor with electrically isolated current path allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
- Differential Hall sensing rejects common-mode fields, so the orientation of the sensor relative to uniform external magnetic fields (e.g. the Earth’s magnetic field) has less effect on the measurement.
- The conductive path internal resistance is typically 0.2 mΩ, and the PCB is made with 6 layers of 2-oz copper, so very little power is lost in the module.
- High-bandwidth 250 kHz analog output voltage proportional to AC or DC currents.
- Less than 2 µs response time.
- Integrated digital temperature compensation circuitry allows improved accuracy over the full operating temperature range.
- Compact (0.7″×0.8″) carrier board offers a variety of ways to insert it into the current path along with 0.1″-pitch (breadboard-compatible) power, ground, and output pins.
- 3.3V and 5V versions available.
- Unidirectional and bidirectional versions available.
These sensors are the compact versions, which feature smaller 0.7″×0.8″ boards for integration into more space-constrained applications or for evaluation of the IC’s performance with a smaller PCB area for thermal dissipation. Larger versions are also available with space for larger connectors and thicker wires for the high-current path.
The following table lists the available ACS72981 carrier options:
| Pololu Item # |
Part Suffix | Supply Voltage (V) |
Current Range | Sensitivity @ Nominal Vcc (mV/A) |
Zero Point @ Nominal Vcc (V) |
Size | Price | ||
|---|---|---|---|---|---|---|---|---|---|
 Compact Carrier |
#5250 | 050B3 | 3.0 to 3.6 (3.3 nominal) |
Bidirectional | ±50 A | 26.4 | 1.65 | 0.7″×0.8″ | $9.95 |
| #5253 | 100B3 | ±100 A | 13.2 | ||||||
| #5257 | 150B3 | ±150 A | 8.8 | ||||||
| #5252 | 050U3 | Unidirectional | 0-50 A | 52.8 | 0.33 | ||||
| #5255 | 100U3 | 0-100 A | 26.4 | ||||||
| #5259 | 150U3 | 0-150 A | 17.6 | ||||||
| #5263 | 200U3 | 0-200 A | 13.2 | ||||||
| #5251 | 050B5 | 4.5 to 5.5 (5 nominal) |
Bidirectional | ±50 A | 40 | 2.5 | |||
| #5254 | 100B5 | ±100 A | 20 | ||||||
| #5258 | 150B5 | ±150 A | 13.3 | ||||||
| #5262 | 200B5 | ±200 A | 10 | ||||||
| #5256 | 100U5 | Unidirectional | 0-100 A | 40 | 0.5 | ||||
| #5260 | 150U5 | 0-150 A | 26.7 | ||||||
Alternatives available with variations in these parameter(s): current range Select variant…
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Products in category “ACS72981 Current Sensor Compact Carriers”
| Pololu item #: 5250 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981LLRATR-050B3 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 3.3 V | Zero Point @ 3.3 V | Size |
|---|---|---|---|---|---|
| 050B3 | ±50 A (bidirectional) | 3.0 V to 3.6 V | 26.4 mV/A | 1.65 V | 0.7″×0.8″ |
| Pololu item #: 5251 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981LLRATR-050B5 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 5 V | Zero Point @ 5 V | Size |
|---|---|---|---|---|---|
| 050B5 | ±50 A (bidirectional) | 4.5 V to 5.5 V | 40 mV/A | 2.5 V | 0.7″×0.8″ |
| Pololu item #: 5252 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981LLRATR-050U3 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 3.3 V | Zero Point @ 3.3 V | Size |
|---|---|---|---|---|---|
| 050U3 | 0-50 A (unidirectional) | 3.0 V to 3.6 V | 52.8 mV/A | 0.33 V | 0.7″×0.8″ |
| Pololu item #: 5253 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981LLRATR-100B3 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 3.3 V | Zero Point @ 3.3 V | Size |
|---|---|---|---|---|---|
| 100B3 | ±100 A (bidirectional) | 3.0 V to 3.6 V | 13.2 mV/A | 1.65 V | 0.7″×0.8″ |
| Pololu item #: 5254 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981LLRATR-100B5 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 5 V | Zero Point @ 5 V | Size |
|---|---|---|---|---|---|
| 100B5 | ±100 A (bidirectional) | 4.5 V to 5.5 V | 20 mV/A | 2.5 V | 0.7″×0.8″ |
| Pololu item #: 5255 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981LLRATR-100U3 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 3.3 V | Zero Point @ 3.3 V | Size |
|---|---|---|---|---|---|
| 100U3 | 0-100 A (unidirectional) | 3.0 V to 3.6 V | 26.4 mV/A | 0.33 V | 0.7″×0.8″ |
| Pololu item #: 5256 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981LLRATR-100U5 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 5 V | Zero Point @ 5 V | Size |
|---|---|---|---|---|---|
| 100U5 | 0-100 A (unidirectional) | 4.5 V to 5.5 V | 40 mV/A | 0.5 V | 0.7″×0.8″ |
| Pololu item #: 5257 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981KLRATR-150B3 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 3.3 V | Zero Point @ 3.3 V | Size |
|---|---|---|---|---|---|
| 150B3 | ±150 A (bidirectional) | 3.0 V to 3.6 V | 8.8 mV/A | 1.65 V | 0.7″×0.8″ |
| Pololu item #: 5258 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981KLRATR-150B5 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 5 V | Zero Point @ 5 V | Size |
|---|---|---|---|---|---|
| 150B5 | ±150 A (bidirectional) | 4.5 V to 5.5 V | 13.3 mV/A | 2.5 V | 0.7″×0.8″ |
| Pololu item #: 5259 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981KLRATR-150U3 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 3.3 V | Zero Point @ 3.3 V | Size |
|---|---|---|---|---|---|
| 150U3 | 0-150 A (unidirectional) | 3.0 V to 3.6 V | 17.6 mV/A | 0.33 V | 0.7″×0.8″ |
| Pololu item #: 5260 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981KLRATR-150U5 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 5 V | Zero Point @ 5 V | Size |
|---|---|---|---|---|---|
| 150U5 | 0-150 A (unidirectional) | 4.5 V to 5.5 V | 26.7 mV/A | 0.5 V | 0.7″×0.8″ |
| Pololu item #: 5262 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981ELRATR-200B5 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 5 V | Zero Point @ 5 V | Size |
|---|---|---|---|---|---|
| 200B5 | ±200 A (bidirectional) | 4.5 V to 5.5 V | 10 mV/A | 2.5 V | 0.7″×0.8″ |
| Pololu item #: 5263 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This is the compact version of a simple carrier for Allegro’s ACS72981ELRATR-200U3 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
| Part Suffix | Range | Supply Voltage | Sensitivity @ 3.3 V | Zero Point @ 3.3 V | Size |
|---|---|---|---|---|---|
| 200U3 | 0-200 A (unidirectional) | 3.0 V to 3.6 V | 13.2 mV/A | 0.33 V | 0.7″×0.8″ |
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