ACS37100 TMR Current Sensor Carriers

Basic board dimensions of the ACS37100 TMR Current Sensor Compact Carrier.

We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS37100 tunneling magnetoresistance (TMR), galvanically isolated, high-bandwidth (DC to 10 MHz) current sensors. The following list details some of the sensor’s key features:

• ACS37100 sensors use Allegro’s patented XtremeSense™ TMR (tunneling magnetoresistance) technology for high accuracy, high bandwidth, electrically isolated current measurements.
• Sensor can be inserted anywhere along the current path and used in applications that require electrical isolation.
• High bandwidth (DC to 10 MHz) analog voltage output proportional to the current.
• 50 ns typical response time.
• Differential TMR 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.
• 1.2 mΩ primary current path resistance in the sensor IC, and the PCB is made with 2-layer, 2-oz copper, so very little power is lost in the module.
• Output is not ratiometric (i.e. the zero point and sensitivity are independent of the actual supply voltage), which provides immunity from noisy supplies.
• User-configurable overcurrent fault output with 100 ns response time indicates when the current magnitude exceeds the set threshold and can be used for fast short-circuit detection.
• VREF output for pseudo-differential signaling in noisy application environments.
• Integrated digital temperature compensation circuitry allows improved accuracy over the full operating temperature range.
• Automotive-grade operating temperature range of -40°C to 150°C.
• Carrier boards, available in compact and large sizes, include routed slots for increased creepage along the PCB surface and offer a variety of ways to insert it into the current path along with 0.1″-pitch (breadboard-compatible) power, ground, and output pins.
• Optional connection points for convenient 4-wire measurement of the IC current path resistance.
• The PCB is made with 2-layer (compact versions) or 6-layer (large versions) 2-oz copper, so very little power is lost in the module.

The following table lists the available ACS37100 carrier options:

	Supply Voltage (V)	Current Range	Sensitivity (mV/A)	Part Suffix	Pololu Item #	Size	PCB Details	Isolation Rating (1)	Min PCB Creepage (2)	Price
Compact Carrier	3.0 to 3.6 (3.3 nominal)	±25 A	52.8	025B3	#5476	0.8″×1.1″	2 layers, 2-oz copper	1097 VRMS	9.3 mm	$14.95
		±50 A	26.4	050B3	#5477
Large Carrier	3.0 to 3.6 (3.3 nominal)	±25 A	52.8	025B3	#5478	1.4″×1.2″	6 layers, 2-oz copper	1097 VRMS	10.1 mm	$19.95
		±50 A	26.4	050B3	#5479
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): current range size Select variant…

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