CT432/CT433 TMR Current Sensor Compact Carriers

CT432/CT433 TMR 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 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.
• Compact (0.8″×1.1″), 2-layer 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 (CT433) and 5V (CT432) versions available.

These sensors are the compact versions, which feature smaller 0.8″×1.1″, 2- or 4-layer PCBs for integration into more space-constrained applications or for evaluation of the IC’s performance with a smaller PCB area and fewer copper layers for thermal dissipation. Larger versions with a 6-layer PCB are also available with space for larger connectors and thicker wires for the high-current path.

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

	Pololu Item #	Part Prefix	Supply Voltage (V)	Part Suffix	Current Range		Sensitivity (mV/A)	Zero Point	Size	PCB Details	Price
Compact Carrier	#5310	CT433	3.0 to 3.6 (3.3 nominal)	20MR	Bidirectional	±20 A	50	1.65 V	0.8″×1.1″	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
	#5300	CT432	4.75 to 5.5 (5 nominal)	20MR		±20 A	100	2.5 V		2 layers, 2-oz copper	$8.95
	#5301			30MR		±30 A	66.7
	#5303			65MR		±65 A	30.8			4 layers, 2-oz copper	$9.95
	#5306			50DR	Unidirectional	0-50 A	80	0.5 V
	#5308			70DR		0-70 A	57.1

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

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