ACS72981KLRATR-150U5 Current Sensor Compact Carrier 0A to 150A, 5V

This is the compact version of a simple carrier for Allegro’s ACS72981KLRATR-150U5 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.

AUD$ 14.95

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Our Code: SKU-010606

Supplier Link: [Pololu MPN:5260]

Description

Overview

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; we therefore recommend careful reading of the ACS72981 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 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 analogue 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 and 0.1″-pitch (breadboard compatible) power, ground, and output pins.
3.3V and 5V versions available.
Unidirectional and bidirectional versions available.

The connection points are labelled on the bottom silkscreen. The silkscreen also shows the direction that is interpreted as positive current flow via the +i arrow.

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
	#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		Unidirectional	0-150 A	26.7	0.5

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
	#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		Unidirectional	0-150 A	26.7	0.5

Details for item #5260

ACS72981KLRATR-150U5 Current Sensor Compact Carrier 0A to 150A, 5V, bottom view.

ACS72981 Current Sensor Compact Carrier. (1)

This compact carrier features the ACS72981KLRATR-150U5, which is intended for nominal 5 V operation and is designed for unidirectional input current from 0 A to 150 A. This version can be visually distinguished from the other versions by the “5V U15” printed on the bottom side, as shown in the left picture above.

Part Suffix	Range	Supply Voltage	Sensitivity @ 5 V	Zero Point @ 5 V	Size
150U5	0-150 A (unidirectional)	4.5 V to 5.5 V	26.7 mV/A	0.5 V	0.7″×0.8″

A larger carrier is also available for this sensor IC with room for larger connectors and thicker wires for the high-current path, offering different ways to use or evaluate this current sensor.

Using the sensor

ACS72981 Current Sensor Compact Carrier pinout.

This sensor has five required connections: the input current (IP+ and IP-), logic power (VCC and GND), and the sensor output (VIOUT).

The sensor requires a supply voltage of 4.5 V to 5.5 V to be connected across the VCC and GND pads, which are labelled on the bottom silkscreen. The sensor outputs a ratiometric analogue voltage on VIOUT that has a zero point at VCC/10 and increases by 26.7 mV × (VCC/5 V) per amp of input current:

``V_"IOUT" = V_"CC" / 10 + 0.0267 text(V)/text(A) * V_"CC" / (5 text(V)) * I_"P" = V_"CC" * (1/10 + I_"P" / (187.5 text(A)))``

``I_"P" = 187.5 text(A) * (V_"IOUT" / V_"CC" – 1/10)``

The VIOUT, VCC, and GND pins work with 0.1″-pitch header pins and are compatible with standard solderless breadboards.

ACS72981 Current Sensor Compact Carrier basic hole dimensions.

You can insert the board into your current path in a variety of ways. For typical high-current applications, you can solder wires directly to the through-holes that best match your wires, or you can use solderless ring terminal connectors, as shown in the pictures below. The largest through-holes are big enough for 8 AWG wires or #6 or M3.5 screws, and the second-largest through-holes (and mounting holes) are sized for 12 AWG wires or #2 or M2 screws. Holes with 0.1″, 3.5 mm, and 5 mm spacing are also available as shown in the diagram above for connecting male header pins or terminal blocks, but please note that these connection options will generally not be suitable for the kinds of high currents intended for this sensor.

ACS72981 Current Sensor Compact Carrier with wires connected via solderless ring terminals and header pins soldered for use with a breadboard.	ACS72981 Current Sensor Compact Carrier with wires soldered directly to the board.
ACS72981 Current Sensor Compact Carrier with wires connected via solderless ring terminals and header pins soldered for use with a breadboard, jumper wires, or 0.1″-pitch connectors.	ACS72981 Current Sensor Compact Carrier with wires soldered directly to the board. (1)

Warning: This product is intended for use below 30 V. Working with higher voltages can be extremely dangerous and should only be attempted by qualified individuals with appropriate equipment and experience.

Schematic and dimension diagrams

ACS72981 Current Sensor Carrier schematic diagram.

The dimension diagram is available as a downloadable PDF (400k pdf).

Comparison of the Pololu current sensor carriers

We have a variety of current sensors available with different ranges, sensitivities, and features. The table below summarizes our selection of active and preferred options:


	ACS711 CurrentSensor Carriers	ACS71240 CurrentSensor Carriers	ACS724 CurrentSensor Carriers	ACS37220Current SensorCompact Carriers	ACS37220Current SensorLarge Carriers	ACS72981Current SensorCompact Carriers	ACS72981Current SensorLarge Carriers
Sensor IC	Allegro ACS711KEXT	Allegro ACS71240	Allegro ACS724LLCTR	Allegro ACS37220		Allegro ACS72981xLR
Vcc range (V)	3.0–5.5	3.3V versions: 3.0–3.6 5V versions: 4.5–5.5	4.5–5.5	3.3V versions: 3.15–3.45 5V versions: 4.5–5.5		3.3V versions: 3.0–3.6 5V versions: 4.5–5.5
Current range / sensitivity	Bidirectional:⁽¹⁾ ±15.5 A / 90 mV/A ±31 A / 45 mV/A	3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A ±50 A / 26.4 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66 mV/A ±50 A / 40 mV/A 5V Unidirectional: 0–⁠50 A / 80 mv/A	5V Bidirectional:⁽²⁾ ±2.5 A / 800 mV/A ±5 A / 400 mV/A ±10 A / 200 mV/A ±20 A / 100 mV/A ±30 A / 66 mV/A ±50 A / 40 mV/A 5V Unidirectional:⁽²⁾ 0–⁠5 A / 800 mv/A 0–⁠10 A / 400 mv/A 0–⁠20 A / 200 mv/A 0–⁠30 A / 133 mV/A	3.3V Bidirectional: ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A 5V Bidirectional: ±100 A / 20 mV/A ±150 A / 13.3 mV/A ±200 A / 10 mV/A	3.3V Bidirectional: ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A 5V Bidirectional: ±100 A / 20 mV/A ±150 A / 13.3 mV/A ±200 A / 10 mV/A	3.3V Bidirectional:⁽¹⁾ ±50 A / 26.4 mV/A ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A 3.3V Unidirectional:⁽¹⁾ 0–⁠50 A / 52.8 mv/A 0–⁠100 A / 26.4 mv/A 0–⁠150 A / 17.6 mv/A 0–⁠200 A / 13.2 mv/A 5V Bidirectional:⁽²⁾ ±50 A / 40 mV/A ±100 A / 20 mV/A ±150 A / 13.3 mV/A ±200 A / 10 mV/A 5V Unidirectional:⁽²⁾ 0–⁠100 A / 40 mv/A 0–⁠150 A / 26.7 mv/A	3.3V Bidirectional:⁽¹⁾ ±50 A / 26.4 mV/A ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A 3.3V Unidirectional:⁽¹⁾ 0–⁠50 A / 52.8 mv/A 0–⁠100 A / 26.4 mv/A 0–⁠150 A / 17.6 mv/A 0–⁠200 A / 13.2 mv/A 5V Bidirectional:⁽²⁾ ±50 A / 40 mV/A ±100 A / 20 mV/A ±150 A / 13.3 mV/A ±200 A / 10 mV/A 5V Unidirectional:⁽²⁾ 0–⁠100 A / 40 mv/A 0–⁠150 A / 26.7 mv/A
IC path resistance	0.6 mΩ	0.6 mΩ	0.6 mΩ	0.1 mΩ		0.2 mΩ
PCB	2 layers, 2-oz copper	2 layers, 2-oz copper	2 layers, 2- or 4-oz copper⁽⁴⁾	2 layers, 2-oz copper	6 layers, 2-oz copper	6 layers, 2-oz copper	6 layers, 2-oz copper
Max bandwidth	100 kHz	120 kHz	120 kHz⁽³⁾	150 kHz		250 kHz
Size	0.7″ × 0.8″	0.7″ × 0.8″	0.7″ × 0.8″	0.7″ × 0.8″	1.4″ × 1.2″	0.7″ × 0.8″	1.4″ × 1.2″
Overcurrent fault output				User-configurable threshold
Differential sensing
Non-ratiometric output
1-piece price	$3.49	$3.95	$6.95 – $7.49	$4.95	$7.95	$9.95	$12.95

⁽¹⁾ Sensitivity when Vcc = 3.3 V; sensitivity is ratiometric.
⁽²⁾ Sensitivity when Vcc = 5 V; sensitivity is ratiometric.
⁽³⁾ Bandwidth can be reduced by adding a filter capacitor.
⁽⁴⁾ ±50A version uses 4-oz copper PCB; all other versions use 2-oz copper.

Specifications

Dimensions

Size:	0.7″ × 0.8″
Weight:	1.4 g

General specifications

Typical operating voltage:	5 V
Current sense:	26.7 mV/A¹
Minimum logic voltage:	4.5 V
Maximum logic voltage:	5.5 V
Supply current:	14 mA²
Version:	0A to 150A (unidirectional 150A), 5V
Current sensor:	Allegro ACS72981KLRATR-150U5