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ACS724LLCTR-30AU Current Sensor Carrier 0A to 30A

Pololu item #: 4046
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant

Price break Unit price (US$)
1 6.95
5 6.39
25 5.88
100 5.41


backorders allowed

This board is a simple compact carrier of Allegro’s ACS724LLCTR-30AU Hall effect-based linear 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
30AU 0-30 A (unidirectional) 133 mV/A 0.5 V 4.5 V to 5.5 V

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

 Description Specs (10) Pictures (9) Resources (6) FAQs (0) On the blog (1) 

Overview

We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS724LLCTR Hall effect-based linear 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:

  • 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.
  • Use of a Hall effect sensor means the IC is able to electrically isolate the current path from the sensor’s electronics, which allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
  • High-bandwidth 120 kHz analog output voltage proportional to AC or DC currents.
  • 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 and 0.1″-pitch (breadboard compatible) power, ground, and output pins.

The pads are labeled 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.

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 #4046

ACS724LLCTR-30AU Current Sensor Carrier 0A to 30A, top view.

ACS724LLCTR-30AU Current Sensor Carrier 0A to 30A with included 0.1″ header pins.

This carrier features the ACS724LLCTR-30AU, which operates at 5 V and is designed for unidirectional input current from 0 A to 30 A. This version can be visually distinguished from the other versions by the “30AU” written on the IC as shown in the pictures above.

Part Suffix Range Sensitivity @ 5 V Zero Point @ 5 V Supply Voltage
30AU 0-30 A (unidirectional) 133 mV/A 0.5 V 4.5 V to 5.5 V

When Vcc is 5 V, the output voltage has a zero point at 0.5 V and increases by 133 mV per amp of input current. More generally, More generally, the sensor’s zero point and sensitivity depend on VCC as follows:

``text(Zero Point) = text(VCC) / 10``

``text(Sensitivity) = 0.133 V/A * (1 + ((text(VCC) – 5 V) * 1.3) / (5 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

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 labeled on the bottom silkscreen, and the sensor outputs an analog voltage with a linear relationship to the input current:

``text(VIOUT) = text(Zero Point) + text(Sensitivity) * text(IP)``

``text(IP) = (text(VIOUT) – 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.

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:


ACS711 Current
Sensor Carriers

ACS71240 Current
Sensor Carriers

ACS724 Current
Sensor Carriers

ACS72981 Current
Sensor Carriers
Sensor IC: Allegro
ACS711KEXT
Allegro
ACS71240
Allegro
ACS724LLCTR
Allegro
ACS72981xLR
Vcc range: 3 V–5.5 V 3.3V versions: 3.0 V–3.6 V
5V versions: 4.5 V–5.5 V
4.5 V–5.5 V 3.3V versions: 3.0 V–3.6 V
5V versions: 4.5 V–5.5 V
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 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:(1)
±50 A / 26.4 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

5V Bidirectional:(2)
±50 A / 40 mV/A

5V Unidirectional:(2)
0–⁠100 A / 40 mv/A
IC path resistance: 0.6 mΩ 0.6 mΩ 0.6 mΩ 0.2 mΩ
Max bandwidth: 100 kHz 120 kHz 120 kHz(3) 250 kHz
Size: 0.7″ × 0.8″ 0.7″ × 0.8″ 0.7″ × 0.8″ 0.7″ × 0.8″
Overcurrent fault output
Differential sensing
Non-ratiometric output
1-piece price: $3.49 $3.95 $6.95$7.49 $9.95
(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.

People often buy this product together with:

ACS724LLCTR-05AB Current Sensor Carrier -5A to +5A ACS724LLCTR-05AB Current Sensor Carrier -5A to +5A
ACS724LLCTR-10AU Current Sensor Carrier 0A to 10A ACS724LLCTR-10AU Current Sensor Carrier 0A to 10A
ACS724LLCTR-20AB Current Sensor Carrier -20A to +20A ACS724LLCTR-20AB Current Sensor Carrier -20A to +20A

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