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ACS72981 Current Sensor 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 linear current sensors. The following list details some of the sensor’s key features:
- 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.
- Use of a Hall effect sensor means the IC is able to electrically isolate the current path from the sensor’s electronics, which allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
- High-bandwidth 250 kHz analog output voltage proportional to AC or DC currents.
- Less than 2 µs response time.
- 3.3V and 5V versions available.
- Integrated digital temperature compensation circuitry allows improved accuracy over the full operating temperature range.
- Carrier board offers a variety of ways to insert it into the current path and 0.1″-pitch (breadboard compatible) power, ground, and output pins.
The following table lists the available ACS72981 carrier options:
| Pololu Item # |
Part Suffix | Supply Voltage | Current Range | Sensitivity @ Nominal Vcc |
Zero Point @ Nominal Vcc |
Size | |
|---|---|---|---|---|---|---|---|
| #5250 | 050B3 | 3.0 V to 3.6 V (3.3 V nominal) |
Bidirectional | ±50 A | 26.4 mV/A | 1.65 V | 0.7″×0.8″ (compact carrier) |
| #5253 | 100B3 | ±100 A | 13.2 mV/A | ||||
| #5257 | 150B3 | ±150 A | 8.8 mV/A | ||||
| #5252 | 050U3 | Unidirectional | 0-50 A | 52.8 mV/A | 0.33 V | ||
| #5255 | 100U3 | 0-100 A | 26.4 mV/A | ||||
| #5259 | 150U3 | 0-150 A | 17.6 mV/A | ||||
| #5251 | 050B5 | 4.5 V to 5.5 V (5 V nominal) |
Bidirectional | ±50 A | 40 mV/A | 2.5 V | |
| #5256 | 100U5 | Unidirectional | 0-100 A | 40 mV/A | 0.5 V | ||
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Products in category “ACS72981 Current Sensor Carriers”
| Pololu item #: 5250 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This board is a simple compact carrier of Allegro’s ACS72981LLRATR-050B3 Hall effect-based linear 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 board is a simple compact carrier of Allegro’s ACS72981LLRATR-050B5 Hall effect-based linear 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 | |
|
|
|
This board is a simple compact carrier of Allegro’s ACS72981LLRATR-050U3 Hall effect-based linear 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 board is a simple compact carrier of Allegro’s ACS72981LLRATR-100B3 Hall effect-based linear 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 #: 5255 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This board is a simple compact carrier of Allegro’s ACS72981LLRATR-100U3 Hall effect-based linear 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 board is a simple compact carrier of Allegro’s ACS72981LLRATR-100U5 Hall effect-based linear 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 board is a simple compact carrier of Allegro’s ACS72981KLRATR-150B3 Hall effect-based linear 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 #: 5259 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
|
|
|
This board is a simple compact carrier of Allegro’s ACS72981KLRATR-150U3 Hall effect-based linear 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″ |
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