We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS71240 Hall effect-based, electrically isolated current sensors with overcurrent fault output. 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) does not affect the measurement.
• The conductive path internal resistance is typically 0.6 mΩ, and the PCB is made with 2-oz copper, so very little power is lost in the module.
• High 120 kHz bandwidth for fast response times in control applications.
• Less than 5 µs response time.
• Output is not ratiometric (i.e. the zero point and sensitivity are independent of the actual supply voltage), which provides immunity from noisy supplies.
• Overcurrent fault output with 1.5 µs response time indicates when the current exceeds the optimized sensing range and can be used for fast short-circuit detection.
• Integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor.
• Automotive-grade operating temperature range of -40°C to 125°C.
• 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.

The following table lists the available ACS71240 carrier options:

ACS71240 Current Sensor Carriers
Pololu Item #	Part Suffix	Supply Voltage	Current Range		Sensitivity	Zero Point
#5240	010B3	3.0 V to 3.6 V (3.3 V nominal)	Bidirectional	±10 A	132 mV/A	1.65 V
#5241	030B3			±30 A	44 mV/A
#5242	050B3			±50 A	26.4 mV/A
#5243	010B5	4.5 V to 5.5 V (5 V nominal)		±10 A	200 mV/A	2.5 V
#5244	030B5			±30 A	66 mV/A
#5245	050B5			±50 A	40 mV/A
#5246	050U5		Unidirectional	0-50 A	80 mV/A	0.5 V

Alternatives available with variations in these parameter(s): current range Select variant…

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