ACS71240KEXBLT-010B5 Current Sensor Carrier -10A to +10A, 5V

Pololu item #: 5243
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant

Price break Unit price (US$)
1 3.95
5 3.63
25 3.34
100 3.08


backorders allowed

This board is a simple carrier of Allegro’s ACS71240KEXBLT-010B5 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.6 mΩ) current path and a high 120 kHz bandwidth for fast response times.

Part Suffix Range Supply Voltage Sensitivity Zero Point Fault Trip Level
010B5 ±10 A (bidirectional) 4.5 V to 5.5 V 200 mV/A 2.5 V ±10 A

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

 Description Specs (12) Pictures (11) Resources (6) 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 ACS71240 Hall effect-based, electrically isolated current sensors with overcurrent fault output; we therefore recommend careful reading of the ACS71240 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 0.6 mΩ, and the PCB is made with 2-oz copper, so very little power is lost in the module.
  • High-bandwidth 120 kHz analog output voltage proportional to AC or DC currents.
  • Less than 5 µs 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.
  • Overcurrent fault output with 1.5 µs response time indicates when the current exceeds the optimized sensing range and can be used for fast short-circuit detection.
  • 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 125°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.
  • 3.3V and 5V versions available.
  • Unidirectional and bidirectional versions available.

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

Details for item #5243

ACS71240KEXBLT-010B5 Current Sensor Carrier -10A to +10A, 5V, bottom view.

ACS71240 Current Sensor Carrier.

This carrier features the ACS71240KEXBLT-010B5, which is intended for operation around 5 V and is designed for bidirectional input current from -10 A to +10 A. This version can be visually distinguished from the other versions by the “5V B10” printed on the bottom side, as shown in the left picture above.

Part Suffix Range Supply Voltage Sensitivity Zero Point Fault Trip Level
010B5 ±10 A (bidirectional) 4.5 V to 5.5 V 200 mV/A 2.5 V ±10 A

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. The sensor outputs an analog voltage on VIOUT that is centered at 2.5 V and changes by 200 mV per amp of input current, with positive current increasing the output voltage and negative current decreasing the output voltage:

``V_"IOUT" = 2.5 text(V) + 0.2 text(V)/text(A) * I_"P"``

``I_"P" = (V_"IOUT" – 2.5 text(V)) / (0.2 text(V)/text(A)) = (V_"IOUT" – 2.5 text(V)) * 5 text(A)/text(V)``

The output is not ratiometric, so the zero point and sensitivity are independent of the actual supply voltage.

The optional FAULT pin is normally at VCC and is pulled low when the IP current magnitude exceeds 10 A in either direction. This pin only asserts while the fault condition is present (it is not latched).

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

You can insert the board into your current path 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. 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. The pictures below show some of the possible connection options:

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

ACS72140 current sensor carrier schematic diagram.

The dimension diagram is available as a downloadable PDF (274k pdf).

Real-world power dissipation considerations

Thermal image of a high-current test of a Pololu current sensor carrier (not necessarily this product).

Depending on the version, the ACS71240 can measure up to ±50 A. However, the sensor chip will typically overheat at lower currents. In our tests, we found that our ACS71240 carrier board could conduct about 45 A continuously without reaching the thermal limit for the IC. Our tests were conducted at approximately 25°C ambient temperature with no forced air flow.

The actual current you can pass through the sensor will depend on how well you can keep it cool. The carrier’s printed circuit board is designed to help with this by drawing heat out of the sensor chip. Solid connections to the current path pins (such as with thick soldered wires or large, tightly-secured lugs) can also help reduce heat build-up in the sensor and carrier board.

Warning: Exceeding temperature or current limits can cause permanent damage to the sensor. If you are measuring an average continuous current greater than 30 A, we strongly recommend that you monitor the sensor’s temperature and look into additional cooling if necessary.

This product can get hot enough to burn you long before the chip overheats. Take care when handling this product and other components connected to it.

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
ACS37220
Current Sensor
Compact Carriers
ACS37220
Current Sensor
Large Carriers
ACS72981
Current Sensor
Compact Carriers
ACS72981
Current Sensor
Large Carriers
CT432/CT433 TMR
Current Sensor
Compact Carriers
CT432/CT433 TMR
Current Sensor
Large Carriers
Sensor IC Allegro
ACS711KEXT
Allegro
ACS71240
Allegro
ACS724LLCTR
Allegro ACS37220 Allegro ACS72981xLR Allegro CT432/CT433
Sensing technology Hall effect Hall effect Hall effect Hall effect Hall effect XtremeSense™ TMR
(tunneling magnetoresistance)
Logic voltage 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
3.3V versions: 3.0–3.6
5V versions: 4.75–5.5
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
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
IC path resistance 0.6 mΩ 0.6 mΩ 0.6 mΩ 0.1 mΩ 0.2 mΩ 1 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
2 or 4 layers(5),
2-oz copper
6 layers,
2-oz copper
Max bandwidth 100 kHz 120 kHz 120 kHz(3) 150 kHz 250 kHz 1 MHz
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″ 0.8″ × 1.1″ 1.4″ × 1.2″
Overcurrent fault output User-configurable threshold
Common-mode field rejection
Non-ratiometric output
1-piece price $3.49 $3.95 $6.95$7.49 $4.95 $7.95 $9.95 $12.95 $8.95 $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.
(5) 50A and higher versions use 4-layer PCB; all other versions use 2-layer PCB.

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

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

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