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Current Sensors
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Our bidirectional and unidirectional Hall effect current sensors are a simple way to gain fundamental insight into the performance of your system. You can use them for closed-loop torque control of actuators, tracking power consumption over time, load detection, over-current fault protection, or even as inexpensive current probes for an oscilloscope. We are offering these breakout boards with support from Allegro Microsystems.
These current sensors output an analog voltage that varies linearly with the current passing through them, and because they use the Hall effect to measure the current, they offer full electrical isolation of the current path from the sensor’s electronics. This method of sensing means the sensor can be inserted anywhere into the current path, including on the high side, and because their current path resistance is on the order of 1 mΩ or less, they have minimal effect on the rest of the system.
All of our current sensor carrier boards (also called breakout boards) feature multiple options for making connections. For low-current applications, they all include at least one pair of through-holes compatible with 0.1″ male header pins, and for higher-current applications, the larger through-holes can be used for either soldering wires directly to the board or connecting solderless ring terminals.
The comparison table below summarizes our selection of active and preferred current sensors:
 ACS711 Current Sensor Carriers |
 ACS71240 Current Sensor Carriers |
 ACS724 Current Sensor Carriers |
 ACS72981 Current Sensor Carriers |
|
|---|---|---|---|---|
| Sensor IC: | Allegro ACS711KEXT |
Allegro ACS71240 |
Allegro ACS724LLCTR |
Allegro ACS72981xLR |
| Vcc range: | 3 V–5.5 V | 3.3V versions: 3.0 V–3.6 V 5V versions: 4.5 V–5.5 V |
4.5 V–5.5 V | 3.3V versions: 3.0 V–3.6 V 5V versions: 4.5 V–5.5 V |
| Current range / sensitivity: |
Bidirectional:(1) ±15.5 A / 90 mV/A ±31 A / 45 mV/A |
Bidirectional 3.3V: ±10 A / 132 mV/A |
Bidirectional:(2) ±2.5 A / 800 mV/A ±5 A / 400 mV/A ±10 A / 200 mV/A ±20 A / 100 mV/A ±30 A / 66 mV/A ±50 A / 40 mV/A Unidirectional:(2) 0–5 A / 800 mv/A 0–10 A / 400 mv/A 0–20 A / 200 mv/A 0–30 A / 133 mV/A |
Bidirectional 3.3V:(1) ±50 A / 26.4 mV/A Unidirectional 3.3V:(1) 0–50 A / 52.8 mv/A 0–100 A / 26.4 mv/A Bidirectional 5V:(2) ±50 A / 40 mV/A Unidirectional 5V:(2) 0–100 A / 40 mv/A |
| IC path resistance: | 0.6 mΩ | 0.6 mΩ | 0.6 mΩ | 0.2 mΩ |
| Max bandwidth: | 100 kHz | 120 kHz | 120 kHz(3) | 250 kHz |
| Size: | 0.7″ × 0.8″ | 0.7″ × 0.8″ | 0.7″ × 0.8″ | 0.7″ × 0.8″ |
| Overcurrent fault output | ||||
| Differential sensing | ||||
| Non-ratiometric output | ||||
| 1-piece price: | $3.49 | $3.95 | $6.95 – $7.49 | $9.95 |
| (1) Sensitivity when Vcc = 3.3 V; sensitivity is ratiometric. | ||||
| (2) Sensitivity when Vcc = 5 V; sensitivity is ratiometric. | ||||
| (3) Bandwidth can be reduced by adding a filter capacitor. | ||||
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Subcategories
These boards are simple carriers of Allegro’s high-current ACS72981 Hall effect linear current sensors, which output an analog voltage proportional to the current passing through them. They offer differential sensing, a low-resistance (~0.2 mΩ) current path, a high 250 kHz bandwidth, and electrical isolation. 3.3.V and 5V versions are available.
These boards are simple carriers of Allegro’s 5V ACS724 Hall effect-based linear current sensors, which output an analog voltage proportional to the current passing through them. They offer differential sensing for higher accuracy, a low-resistance (~0.6 mΩ) current path, and electrical isolation.
These boards are simple carriers of Allegro’s ACS71240 Hall effect-based linear current sensors, which output an analog voltage proportional to the current passing through them. They offer differential sensing for higher accuracy, a low-resistance (~0.6 mΩ) current path, and electrical isolation. 3.3.V and 5V versions are available.
These boards are simple carriers of Allegro’s ACS711 Hall effect-based linear current sensors, which output an analog voltage proportional to the current passing through them. They offer a low-resistance (~0.6 mΩ) current path and electrical isolation up to 100 V.
These are older current sensors on clearance and will be discontinued once remaining component stock is depleted.
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