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ACS711KEXLT-15AB-T Current Sensor Carrier -15.5A to +15.5A

Pololu item #: 2452
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant

Price break Unit price (US$)
1 3.49
5 3.21
25 2.95
100 2.72


backorders allowed

This board is a simple carrier of Allegro’s ACS711KEXLT-15AB-T Hall effect-based linear current sensor, which offers a low-resistance (~0.6 mΩ) current path and a 100 kHz bandwidth for fast response times.

Part Suffix Range Sensitivity @ 3.3 V Zero Point @ 3.3 V Fault Trip Level Supply Voltage
KEXLT-15AB-T ±15.5 A (bidirectional) 90 mV/A 1.65 V ±15.5 A 3 V to 5.5 V
 Description Specs (9) Pictures (6) Resources (5) FAQs (0) On the blog (0) 

Overview

We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS711 Hall effect-based linear current sensors with overcurrent fault output; we therefore recommend careful reading of the ACS711 datasheet before using this product. This sensor has an operating voltage of 3 V to 5.5 V and an output sensitivity of 90 mV/A when Vcc is 3.3 V (or 136 mV/A when Vcc is 5 V). The following list details some of the sensor’s key features:

  • Designed for bidirectional input current from -15.5 A to 15.5 A (though the robust sensor IC can tolerate 100 ms transient current spikes up to 100 A).
  • Conductive path internal resistance is typically 0.6 mΩ, and the PCB is made with 2-oz copper, so very little power is lost in the board.
  • Use of a Hall effect sensor means the IC is able to electrically isolate the current path from the sensor’s electronics (up to 100 V), which allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
  • 100 kHz bandwidth analog output voltage proportional to AC or DC currents.
  • Good accuracy and reliability: factory calibration results in a typical total output error of ±5% at room temperature, the output offset voltage is extremely stable, and the sensor has zero magnetic hysteresis.
  • Overcurrent FAULT output latches low when current magnitude exceeds 15.5 A.
  • Operating temperature range of -40°C to 125°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.

This 15.5 A current sensor is marked with a black X. We also sell a 31 A version that uses the same carrier PCB; you can distinguish the versions by reading the text on the IC or by looking at the color of the X on the bottom silkscreen.

Using the sensor

Electrical connections

The sensor requires a supply voltage of 3 V to 5.5 V to be connected across the Vcc and GND pads, which are labeled on the bottom silkscreen. The sensor outputs an analog voltage that is linearly proportional to the input current. The quiescent output voltage is Vcc/2 and changes by 90 mV per amp of input current (when Vcc = 3.3 V), with positive current increasing the output voltage and negative current decreasing the output voltage. The relationship between the instantaneous input current, i, and sensor output voltage, VOUT, can be represented by the following equations:

The FAULT pin is normally high and latches low when the current exceeds ±15.5 A. Once the FAULT pin is latched low, the only way to reset it is by toggling power on the Vcc pin. In our tests, this module was able to handle 15 A of continuous current without exceeding 50°C, with no cooling beyond the heat dissipation of the PCB.

ACS711EX current sensor carrier connection and mounting dimension diagram.

ACS711 current sensor carrier (LC package version) with solderless ring terminal connectors (not included).

The input current can be connected to the board in a variety of ways. Holes with 0.1″, 3.5 mm, and 5 mm spacing are available as shown in the diagram above for connecting male header pins or terminal blocks. For 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 picture above. The large through-holes are big enough for #6 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.

Mounting information

The board has two mounting holes on the logic side of the board. These mounting holes are 0.5″ apart and are designed for #2 screws.

Included components

This board ships assembled with all surface mount components, and a 5×1 strip of 0.1″ header pins is included but not soldered in, as shown in the picture below.

ACS711EX current sensor carrier with included 5 × 1 0.1″ header pins.

Schematic and dimension diagrams

ACS711 current sensor carrier schematic diagram.

The dimension diagram is available as a downloadable PDF (273k pdf).

Comparison of the Pololu current sensor carriers

We have a variety of current sensors available with different ranges, sensitivities, and features. You can use the following table to compare our 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
Bidirectional 3.3V:
±10 A / 132 mV/A
±50 A / 26.4 mV/A

Unidirectional 5V:
0–⁠50 A / 80 mv/A

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

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

Bidirectional 3.3V:(1)
±50 A / 26.4 mV/A
±150 A / 8.8 mV/A

Unidirectional 3.3V:(1)
0–⁠50 A / 52.8 mv/A
0–⁠100 A / 26.4 mv/A

Bidirectional 5V:(2)
±50 A / 40 mV/A

Unidirectional 5V:(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:

ACS711KEXLT-31AB-T Current Sensor Carrier -31A to +31A ACS711KEXLT-31AB-T Current Sensor Carrier -31A to +31A

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