CT432/CT433 TMR 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 CT432/CT433 tunneling magnetoresistance (TMR), electrically isolated, high-bandwidth current sensors that are optimized for high dV/dt applications. The following list details some of the sensors’ key features:

• CT432/CT433 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 be used in applications that require electrical isolation.
• 1 mΩ primary current path resistance in the sensor IC, and the PCB is made with 2-layer (compact versions under 50A), 4-layer (compact versions 50A and up), or 6-layer (large versions) 2-oz copper, so very little power is lost in the module.
• 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.
• Optimized for high dV/dt applications, allowing the sensor to be used in switching applications.
• High-bandwidth 1 MHz analog output voltage proportional to AC or DC currents.
• Typical 300 ns 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.
• Optional overcurrent fault output indicates when the current magnitude exceeds 110% of the maximum linear sensing range.
• Operating temperature range of -40°C to 125°C.
• 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 (CT433) and 5V (CT432) versions available.

The following table lists the available CT432/CT433 carrier options:

	Pololu Item #	Part Prefix	Supply Voltage (V)	Part Suffix	Current Range		Sensitivity (mV/A)	Zero Point	PCB Details	Price
Compact Carrier (0.8″×1.1″)	#5310	CT433	3.0 to 3.6 (3.3 nominal)	20MR	Bidirectional	±20 A	50	1.65 V	2 layers, 2-oz copper	$8.95
	#5311			30MR		±30 A	33.3
	#5313			50MR		±50 A	20		4 layers, 2-oz copper	$9.95
	#5315			70MR		±70 A	14.3
	#5316			20DR	Unidirectional	0-20 A	100	0.65 V	2 layers, 2-oz copper	$8.95
	#5317			30DR		0-30 A	66.7
	#5318			50DR		0-50 A	40		4 layers, 2-oz copper	$9.95
	#5319			65DR		0-65 A	30.8
	#5300	CT432	4.75 to 5.5 (5 nominal)	20MR	Bidirectional	±20 A	100	2.5 V	2 layers, 2-oz copper	$8.95
	#5301			30MR		±30 A	66.7
	#5302			50MR		±50 A	40		4 layers, 2-oz copper	$9.95
	#5303			65MR		±65 A	30.8
	#5304			20DR	Unidirectional	0-20 A	200	0.5 V	2 layers, 2-oz copper	$8.95
	#5305			30DR		0-30 A	133.3
	#5306			50DR		0-50 A	80		4 layers, 2-oz copper	$9.95
	#5308			70DR		0-70 A	57.1
Large Carrier (1.4″×1.2″)	#5333	CT433	3.0 to 3.6 (3.3 nominal)	50MR	Bidirectional	±50 A	20	1.65 V	6 layers, 2-oz copper	$12.95
	#5335			70MR		±70 A	14.3
	#5338			50DR	Unidirectional	0-50 A	40	0.65 V
	#5339			65DR		0-65 A	30.8
	#5322	CT432	4.75 to 5.5 (5 nominal)	50MR	Bidirectional	±50 A	40	2.5 V
	#5323			65MR		±65 A	30.8
	#5326			50DR	Unidirectional	0-50 A	80	0.5 V
	#5328			70DR		0-70 A	57.1

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

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