ACS37042 Current Sensor Compact Carriers

ACS3704x Current Sensor Compact Carrier pinout.

We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS37042 Hall effect-based, electrically isolated current sensors; we therefore recommend careful reading of the ACS37042 datasheet before using this product. 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 galvanic isolation.
• Low primary current path resistance of 1.6 mΩ in the sensor IC, so very little power is lost in the module.
• 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.
• High-bandwidth 150 kHz analog output voltage proportional to AC or DC currents.
• 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.
• Integrated temperature compensation circuitry allows improved accuracy over the full operating temperature range.
• Automotive-grade operating temperature range of -40°C to 125°C.
• Carrier boards, available in micro (0.3″×0.4″) and our standard compact (0.7″×0.8″) 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.
• The ACS37042 ICs have a higher isolation rating than the similar ACS37041 and are on PCBs with routed slots for higher creepage.

These sensors are the larger versions with our standard compact form factor, which matches the compact form factor available for many of our other current sensor carriers. Micro versions with smaller 0.3″×0.4″ PCBs are available for integration into more space-constrained applications or for evaluation of the IC’s performance with a smaller PCB area for thermal dissipation.

The following table lists the available ACS37042 compact carrier options:

	ACS37042 Compact Carriers
	Pololu Item #	Part Suffix	Isolation Rating 1	Supply Voltage	Current Range	Sensitivity (mV/A)	Zero Point	Size	PCB Details	Min PCB Creepage 2	Price
	#5454	010B3	285 VRMS	3.0 V to 3.6 V	±10 A	132	1.65 V	0.7″×0.8″ 17.8×20.3 mm	2 layers, 2-oz copper	3.0 mm	$4.49
	#5455	030B3			±30 A	44
	#5456 (coming June 2025)	010B5		4.5 V to 5.5 V	±10 A	200	2.5 V
	#5457 (coming June 2025)	030B5			±30 A	66.7
Note 1: IC component rating per manufacturer datasheet.
Note 2: Minimum creepage along PCB surface based on layout design only. Other creepage distances, e.g. along the body of the component, may be lower.

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

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