Current Sensors

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.

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 full selection of current sensors:


ACS711EX Current
Sensor Carriers

ACHS-712x Current
Sensor Carriers

ACS724 Current
Sensor Carriers

ACS709 Current
Sensor Carrier
Sensor IC: Allegro
ACS711KEXLT
Broadcom
ACHS-712x
Allegro
ACS724LLCTR
Allegro
ACS709LLFTR-35BB
Current range /
sensitivity(1):
Bidirectional:
±15.5 A / 136 mV/A
±31 A / 68 mV/A
Bidirectional:
±10 A / 185 mV/A
±20 A / 100 mV/A
±30 A / 66 mV/A
±40 A / 50 mV/A
±50 A / 40 mV/A

Unidirectional:
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:
±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

Bidirectional:
±75 A / 28 mV/A
Path resistance: 0.6 mΩ 0.7 mΩ 1.2 mΩ 1.1 mΩ
Max bandwidth: 100 kHz 80 kHz(2) 120 kHz(2) 120 kHz(2)
Vcc range:(1) 3 V–5.5 V 4.5 V–5.5 V 4.5 V–5.5 V 3 V–5.5 V
Size: 0.7″ × 0.8″ 0.7″ × 0.8″ 0.7″ × 0.8″ 0.82″ × 0.9″
Special features: over-current fault pin differential Hall sensing
rejects common-mode
fields for higher accuracy,
integrated digital
temperature compensation
configurable
over-current threshold
1-piece price: $3.95 $6.95 $11.95 $14.95
(1) Sensitivity shown for Vcc = 5V.
(2) Bandwidth can be reduced by adding a filter capacitor.

Subcategories

These boards are simple carriers of Allegro’s ACS724 Hall effect-based linear current sensors, which offer differential sensing for higher accuracy, a low-resistance (~1.2 mΩ) current path, and electrical isolation up to 2.4 kV RMS. They operate from 4.5 V to 5.5 V and output an analog voltage proportional to the current.

These boards are simple carriers of Broadcom’s ACHS-712x Hall effect-based linear current sensors, which offer a low-resistance (~0.7 mΩ) current path and electrical isolation up to 3 kV RMS. They operate from 4.5 V to 5.5 V and output an analog voltage proportional to the current.


Products in category “Current Sensors”

Pololu item #: 2452
Brand: Pololu
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

This board is a simple carrier of Allegro’s ±15.5 A ACS711 Hall effect-based linear current sensor with overcurrent fault output, which offers a low-resistance (~0.6 mΩ) current path and electrical isolation up to 100 V. This version accepts a bidirectional current input with a magnitude up to 15.5 A and outputs a proportional analog voltage centered at Vcc/2 with a typical error of ±5%. It operates from 3 V to 5.5 V, so it can interface directly to both 3.3 V and 5 V systems.

Pololu item #: 2453
Brand: Pololu
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

This board is a simple carrier of Allegro’s ±31 A ACS711 Hall effect-based linear current sensor with overcurrent fault output, which offers a low-resistance (~0.6 mΩ) current path and electrical isolation up to 100 V. This version accepts a bidirectional current input with a magnitude up to 31 A and outputs a proportional analog voltage centered at Vcc/2 with a typical error of ±4%. It operates from 3 V to 5.5 V, so it can interface directly to both 3.3 V and 5 V systems.

Pololu item #: 2199
Brand: Pololu
Status: Rationed (Active) 
RoHS 3 compliant
Out of stock.
Quantity:

This board is a simple carrier of Allegro’s ±75A ACS709 Hall effect-based linear current sensor with overcurrent fault output, which offers a low-resistance (~1.1 mΩ) current path and electrical isolation up to 2.1 kV RMS. The sensor has optimized accuracy for currents from -37.5 A to 37.5 A, and the analog voltage output is linear for current magnitudes up to 75 A. The ratiometric output voltage is centered at VCC/2 and has a typical error of ±2%. It operates from 3 V to 5.5 V, so it can interface directly to both 3.3 V and 5 V systems.

Pololu item #: 1185
Brand: Pololu supply outlook
Status: End-of-Life Rationing 
RoHS 3 compliant
Out of stock.
Quantity:

This board is a simple carrier of Allegro’s ±5A ACS714 Hall effect-based linear current sensor, which offers a low-resistance (~1.2 mΩ) current path and electrical isolation up to 2.1 kV RMS. This version accepts a bidirectional current input with a magnitude up to 5 A and outputs a proportional analog voltage (185 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 V to 5.5 V and is intended for use in 5 V systems.

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