ACS72981 Current Sensor Compact Carrier (top) and Large Carrier (bottom) size comparison.

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.
• Carrier boards, available in compact and large sizes, offer 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 ACS72981 carrier options:

	Pololu Item #	Part Suffix	Supply Voltage (V)	Current Range		Sensitivity @ Nominal Vcc (mV/A)	Zero Point @ Nominal Vcc (V)	Size	Price
Large Carrier	#5270	050B3	3.0 to 3.6 (3.3 nominal)	Bidirectional	±50 A	26.4	1.65	1.4″×1.2″	$12.95
	#5273	100B3			±100 A	13.2
	#5277	150B3			±150 A	8.8
	#5281	200B3			±200 A	6.6
	#5272	050U3		Unidirectional	0-50 A	52.8	0.33
	#5275	100U3			0-100 A	26.4
	#5279	150U3			0-150 A	17.6
	#5283	200U3			0-200 A	13.2
	#5271	050B5	4.5 to 5.5 (5 nominal)	Bidirectional	±50 A	40	2.5
	#5274	100B5			±100 A	20
	#5278	150B5			±150 A	13.3
	#5282	200B5			±200 A	10
	#5276	100U5		Unidirectional	0-100 A	40	0.5
	#5280	150U5			0-150 A	26.7
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
	#5261	200B3			±200 A	6.6
	#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): typical operating voltage current range size Select variant…

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