ACS724LLCTR-20AB Current Sensor Carrier -20A to +20A

This board is a simple compact carrier of Allegro’s ACS724LLCTR-20AB Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~1.2 mΩ) current path and a high 120 kHz bandwidth for fast response times.

AUD$ 13.95

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Our Code: SKU-005508

Supplier Link: [Pololu MPN:4045]

This board is a simple compact carrier of Allegro’s ACS724LLCTR-20AB Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~1.2 mΩ) current path and a high 120 kHz bandwidth for fast response times.

Part Suffix	Range	Sensitivity @ 5 V	Zero Point @ 5 V	Supply Voltage
20AB	±20 A (bidirectional)	100 mV/A	2.5 V	4.5 V to 5.5 V

Description

Overview

ACS724 current sensor carrier, bottom view with dimensions.

We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS724LLCTR Hall effect-based, electrically isolated current sensors; we therefore recommend careful reading of the ACS724 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 1.2 mΩ, and the PCB is made with 2-oz or 4-oz copper, depending on the sensor version, so very little power is lost in the module.
High-bandwidth 120 kHz analogue output voltage proportional to AC or DC currents.
Typical 4 µs response time.
Optional FILTER pin simplifies bandwidth limiting for better noise reduction and improved resolution at lower frequencies.
Integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor.
Automotive-grade operating temperature range of -40°C to 150°C.
0.7″×0.8″ 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.
Unidirectional and bidirectional versions available.

The pads are labelled on the bottom silkscreen, as shown in the picture to the right. The silkscreen also shows the direction that is interpreted as positive current flow via the +i arrow.

A variety of options are available with different current sensing ranges and sensitivities:

ACS724 Current Sensor Carriers

Sensitivity⁽¹⁾	Unidirectional range	Bidirectional range
800 mV/A	0A to 5A	-2.5A to +2.5A
400 mV/A	0A to 10A	-5A to +5A
200 mV/A	0A to 20A	-10A to +10A
133 mV/A	0A to 30A
100 mV/A		-20A to +20A
66 mV/A		-30A to +30A
40 mV/A		-50A to +50A

¹ Sensitivity shown for Vcc = 5V.

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

These versions all look very similar, and while you can distinguish them by reading the text on the IC, we also provide a white box on the bottom silkscreen where you can add your own distinguishing markings if so desired.

Details for item #4045

ACS724LLCTR-20AB Current Sensor Carrier -20A to +20A, top view.

ACS724LLCTR-20AB Current Sensor Carrier -20A to +20A with included 0.1″ header pins.

This carrier features the ACS724LLCTR-20AB, which operates at 5 V and is designed for bidirectional input current from -20 A to +20 A. This version can be visually distinguished from the other versions by the “20AB” written on the IC as shown in the pictures above.

Part Suffix	Range	Sensitivity @ 5 V	Zero Point @ 5 V	Supply Voltage
20AB	±20 A (bidirectional)	100 mV/A	2.5 V	4.5 V to 5.5 V

When Vcc is 5 V, the output voltage is centred at 2.5 V and changes by 100 mV per amp of input current, with positive current increasing the output voltage and negative current decreasing the output voltage. More generally, the sensor’s zero point and sensitivity depend on VCC as follows:

``text(Zero Point) = V_"CC" / 2``

``text(Sensitivity) = 0.1 text(V)/text(A) * (1 + ((V_"CC" – 5 text(V)) * 1.3) / (5 text(V)))``

This board ships assembled with all surface mount components, and a 3×1 strip of 0.1″ header pins is included but not soldered in.

Using the sensor

ACS724 Current Sensor 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, and the sensor outputs an analogue voltage with a linear relationship to the input current:

``V_"IOUT" = text(Zero Point) + text(Sensitivity) * I_"P"``

``I_"P" = (V_"IOUT" – text(Zero Point)) / text(Sensitivity)``

The FILTER pin lets you adjust the board’s bandwidth by adding a capacitor to ground (a ground pad has been added next to the FILTER pin for convenience) in parallel with the 1 nF capacitor that is already on the board. Without an added external filter capacitor, the bandwidth is about 90 kHz. The datasheet provides more information on how the filter capacitors affect bandwidth.

You can insert the board into your current path in a variety of ways. For low-current applications, you can solder 0.1″ male header pins to the board via the smallest pair of through-holes on the input-current side of the board. For higher-current applications, you can solder wires directly to the through-holes that best match your wires, or you can use solderless ring terminal connectors. 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.

Current sensor carrier soldered with high-current wires.

Current sensor carrier with solderless ring terminal connectors (not included).

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

Schematic diagram of the ACS724 Current Sensor Carrier.

The dimension diagram is available as a downloadable PDF (1MB 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:


	CT220 ContactlessCurrent SensorCarriers	ACS3704xCurrent SensorMicro Carriers	ACS3704xCurrent SensorCompact Carriers	ACS711 CurrentSensor Carriers	ACS71240 CurrentSensor Carriers	ACS724 CurrentSensor Carriers	ACS37030Current SensorCompact Carriers	ACS37220Current SensorCompact Carriers
Allegro Sensor	CT220xMV-HS5	ACS3704x		ACS711KEXT	ACS71240	ACS724LLCTR	ACS37220	ACS37030
Sensing technology	XtremeSense™ TMR (tunneling magnetoresistance)	Hall effect		Hall effect	Hall effect	Hall effect	Hall effect + inductive coil	Hall effect
Logic voltage range	2.7–5.5 V	3.3V versions: 3.0–3.6 V 5V versions: 4.75–5.5 V		3.0–5.5 V	3.3V ver: 3.0–3.6 V 5V ver: 4.5–5.5 V	4.5–5.5 V	3.0–3.6 V	3.3V ver: 3.15–3.45 V 5V ver: 4.5–5.5 V
Family current range	10–800 A	10–30 A		15.5–31 A	10–50 A	2.5–50 A	20–65 A	100–200 A
Range/sensitivity of individual versions	⁽²⁾ ±1.5 mT / 1500 mV/mT ±15 mT / 150 mV/mT	ACS37041: 3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66.7 mV/A ACS37042: 3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66.7 mV/A	ACS37041: 3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66.7 mV/A ACS37042: 3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66.7 mV/A	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: ±20 A / 66 mV/A ±40 A / 33 mV/A ±65 A / 20.3 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
IC current path resistance	N/A	1.6 mΩ		0.6 mΩ	0.6 mΩ	0.6 mΩ	0.7 mΩ	0.1 mΩ
PCB	N/A	2 layers, 1-oz copper	2 layers, 2-oz copper	2 layers, 2-oz copper	2 layers, 2-oz copper	2 layers, 2- or 4-oz copper⁽³⁾	2 layers, 2-oz copper	2 layers, 2-oz copper
Max bandwidth	30 kHz	150 kHz		100 kHz	120 kHz	120 kHz⁽⁴⁾	5 MHz	150 kHz
Size	0.4″ × 0.62″	0.3″ × 0.4″	0.7″ × 0.8″	0.7″ × 0.8″	0.7″ × 0.8″	0.7″ × 0.8″	0.7″ × 0.8″	0.7″ × 0.8″
Overcurrent fault output								User-configurable threshold
Common-mode field rejection
Nonratiometric output
1-piece price	$4.95	$4.15 – $4.69	$4.45 – $4.99	$4.85	$5.25	$9.95 – $11.49	$11.95	$6.95

Note 1: Sensitivity when Vcc = 3.3 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc).
Note 2: Sensitivity when Vcc = 5 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc).
Note 3: 50A version of this carrier uses 4-oz copper PCB; all other versions of this carrier use 2-oz copper.
Note 4: Bandwidth can be reduced by adding a filter capacitor.


	ACS37030Current SensorCompact Carriers	ACS37030Current SensorLarge Carriers	CT432/CT433 TMRCurrent SensorCompact Carriers	CT432/CT433 TMRCurrent SensorLarge Carriers	ACS72981Current SensorCompact Carriers	ACS72981Current SensorLarge Carriers	ACS37220Current SensorCompact Carriers	ACS37220Current SensorLarge Carriers
Allegro Sensor	ACS37030		CT432/CT433		ACS72981xLR		ACS37220
Sensing technology	Hall effect + inductive coil		XtremeSense™ TMR (tunneling magnetoresistance)		Hall effect		Hall effect
Logic voltage range	3.0–3.6 V		3.3V versions: 3.0–3.6 V 5V versions: 4.75–5.5 V		3.3V versions: 3.0–3.6 V 5V versions: 4.5–5.5 V		3.3V versions: 3.15–3.45 V 5V versions: 4.5–5.5 V
Family current range	20–65 A		20–70 A		50–200 A		100–200 A
Range/sensitivity of individual versions	3.3V Bidirectional: ±20 A / 66 mV/A ±40 A / 33 mV/A ±65 A / 20.3 mV/A	3.3V Bidirectional: ±40 A / 33 mV/A ±65 A / 20.3 mV/A	3.3V Bidirectional: ±20 A / 50 mV/A ±30 A / 33.3 mV/A ±50 A / 20 mV/A ±70 A / 14.3 mV/A 3.3V Unidirectional: 0–⁠20 A / 100 mv/A 0–⁠30 A / 66.7 mv/A 0–⁠50 A / 40 mv/A 0–⁠65 A / 30.8 mv/A 5V Bidirectional: ±20 A / 100 mV/A ±30 A / 66.7 mV/A ±50 A / 40 mV/A ±65 A / 30.8 mV/A 5V Unidirectional: 0–⁠20 A / 200 mv/A 0–⁠30 A / 133.3 mv/A 0–⁠50 A / 80 mv/A 0–⁠70 A / 57.1 mv/A	3.3V Bidirectional: ±50 A / 20 mV/A ±70 A / 14.3 mV/A 3.3V Unidirectional: 0–⁠50 A / 40 mv/A 0–⁠65 A / 30.8 mv/A 5V Bidirectional: ±50 A / 40 mV/A ±65 A / 30.8 mV/A 5V Unidirectional: 0–⁠50 A / 80 mv/A 0–⁠70 A / 57.1 mv/A	3.3V Bidirectional:⁽¹⁾ ±50 A / 26.4 mV/A ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A ±200 A / 6.6 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⁾ 0–⁠50 A / 80 mv/A 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 ±200 A / 6.6 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⁾ 0–⁠50 A / 80 mv/A 0–⁠100 A / 40 mv/A 0–⁠150 A / 26.7 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
IC current path resistance	0.7 mΩ		1 mΩ		0.2 mΩ		0.1 mΩ
PCB	2 layers, 2-oz copper	6 layers, 2-oz copper	2 or 4 layers⁽³⁾, 2-oz copper	6 layers, 2-oz copper	6 layers, 2-oz copper	6 layers, 2-oz copper	2 layers, 2-oz copper	6 layers, 2-oz copper
Max bandwidth	5 MHz		1 MHz		250 kHz		150 kHz
Size	0.7″ × 0.8″	1.4″ × 1.2″	0.8″ × 1.1″	1.4″ × 1.2″	0.7″ × 0.8″	1.4″ × 1.2″	0.7″ × 0.8″	1.4″ × 1.2″
Overcurrent fault output							User-configurable threshold
Common-mode field rejection
Nonratiometric output
1-piece price	$11.95	$14.95	$12.95	$16.95	$13.95	$16.95	$6.95	$10.95

Note 1: Sensitivity when Vcc = 3.3 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc).
Note 2: Sensitivity when Vcc = 5 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc).
Note 3: 50A and higher versions of this carrier use a 4-layer PCB; all other versions of this carrier use a 2-layer PCB.

You can also use the following selection box to see these options sorted by current range:

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

Specifications

Dimensions

Size:	0.7″ × 0.8″
Weight:	1.1 g

General specifications

Current sense:	100 mV/A¹
Minimum logic voltage:	4.5 V
Maximum logic voltage:	5.5 V
Supply current:	14 mA²
Current range:	-20A to +20A (bidirectional 20A), 5V
Current sensor:	Allegro ACS724LLCTR-20AB

Identifying markings

PCB dev codes:	cs01a
Other PCB markings:	0J1214, blank white box

Notes:

1: When Vcc is 5 V.
2: Max. 10 mA typical.

Resources

File downloads

Dimension diagram of the ACS724 Current Sensor Carrier (1MB pdf)
3D model of the ACS724 Current Sensor Carrier (3MB step)
Drill guide for ACHS-712x Current Sensor Carriers (17k dxf)

This DXF drawing shows the locations of all of the board’s holes. The through-hole sizes and locations in this file also apply to cs01b versions of the PCB, though some of the via locations are different.