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Full machine-readable index: https://core-electronics.com.au/llms.txt # ACS711EX Current Sensor Carrier -31A to +31A **Type:** Product page · **SKU:** POLOLU-2453 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/acs711ex-current-sensor-carrier-31a-to-31a.html ([markdown](https://core-electronics.com.au/acs711ex-current-sensor-carrier-31a-to-31a.html.md)) This board is a simple carrier of Allegro’s ±31 A ACS711 Hall effect-based linear current sensor with overcurrent fault output, which offers a low-resistance (~0.6 mΩ) current path and electrical isolation up to 100 V. This version accepts a bidirectional current input with a magnitude up to 31 A and outputs a proportional analog voltage centered at Vcc/2 with a typical error of ±4%. It operates from 3 V to 5.5 V, so it can interface directly to both 3.3 V and 5 V systems. ## Pricing - **Price:** $8.20 (inc GST) — $7.45 AUD, exc GST - **Quantity discounts:** 10+ $7.15 (exc GST) · 25+ $6.94 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 17 and Aug 19. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-2453:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-2453:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description | [![](https://core-electronics.com.au/attachments/localcontent/0J4592_159064d024f.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4592_35369791258.jpg) | |---| | [![](https://core-electronics.com.au/attachments/localcontent/0J4599_157769c20af.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4599_19743c8fb9c.jpg) | |---| This current sensor is a carrier board or breakout board for Allegro’s ACS711KEXLT-31AB-T Hall effect-based linear current sensor with overcurrent fault output; Pololu therefore recommend careful reading of the ACS711 datasheet (533k pdf) before using this product. This sensor has an operating voltage of 3 V to 5.5 V and an output sensitivity of 45 mV/A when Vcc is 3.3 V (or 68 mV/A when Vcc is 5 V). The following list details some of the sensor’s key features: - Designed for bidirectional input current from -31 A to 31 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 mO, 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 (for applications 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. - Good accuracy and reliability: factory calibration results in a typical total output error of ±4% 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 31 A. - Operating temperature range of -40°C to 125°C. 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 31 A current sensor is marked with a **green X**. Pololu also sell a [15.5 A version](https://core-electronics.com.au/acs711ex-current-sensor-carrier-15-5a-to-15-5a.html) 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. This sensor is very similar to Pololu's original [ACS711 -25 to +25 A Current Sensor Carrier](https://core-electronics.com.au/acs711lc-current-sensor-carrier-25a-to-25a.html), but uses a smaller “EX” package that has a larger optimized sensing range and reduced internal resistance. The board size, pinout, and hole locations are all unchanged, so it can generally be used as a drop-in replacement for Pololu's ACS711 carriers with “LC” packages. **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 45 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: | ![](https://core-electronics.com.au/attachments/localcontent/0J4602_3754f096f1.png) | |---| The FAULT pin is normally high and latches low when the current exceeds ±31 A. Once the FAULT pin is latched low, the only way to reset it is by toggling power on the Vcc pin. In Pololu's tests, this module was able to handle 31 A of continuous current without exceeding 100°C, with no cooling beyond the heat dissipation of the PCB. | \| [![](https://core-electronics.com.au/attachments/localcontent/0J4598_24800eccae6.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4598_1722206b745.jpg) \| \|---\| \| ACS711EX current sensor carrier connection and mounting dimension diagram. \| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J3586_141595efa47.jpg)](https://core-electronics.com.au/attachments/localcontent/0J3586_2112633d191.jpg) \| \|---\|---\| \| 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](https://core-electronics.com.au/0-100-2-54-mm-breakaway-male-header-1x40-pin-straight.html) or [terminal blocks](https://core-electronics.com.au/category/117/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 protective gear. **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](https://core-electronics.com.au/machine-screw-2-56-1-4-length-phillips-25-pack.html). **Included components** This board ships assembled with all surface mount components, and a 5×1 strip of [0.1" header pins](https://core-electronics.com.au/0-100-2-54-mm-breakaway-male-header-1x40-pin-straight.html) is included but not soldered in, as shown in the picture below. | [![](https://core-electronics.com.au/attachments/localcontent/0J4593_1340678fccf.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4593_213403f0a25.jpg) | |---| | ACS711EX current sensor carrier with included 5 × 1 0.1" header pins. | **Schematic diagram** | [![](https://core-electronics.com.au/attachments/localcontent/0J3673_236801acaa8.jpg)](https://core-electronics.com.au/attachments/localcontent/0J3673_22576717c96.png) | |---| | ACS711 current sensor carrier schematic diagram. | **People often buy this product together with:** | [![ACS711EX Current Sensor Carrier -15.5A to +15.5A](https://core-electronics.com.au/attachments/localcontent/0J4597_47046bd956.jpg)](https://core-electronics.com.au/acs711ex-current-sensor-carrier-15-5a-to-15-5a.html) | [ACS711EX Current Sensor Carrier -15.5A to +15.5A](https://core-electronics.com.au/acs711ex-current-sensor-carrier-15-5a-to-15-5a.html) | |---|---| | [![ACS709 Current Sensor Carrier -75A to +75A](https://core-electronics.com.au/attachments/localcontent/0J3582_49789863c5.jpg)](https://core-electronics.com.au/acs709-current-sensor-carrier-75a-to-75a.html) | [ACS709 Current Sensor Carrier -75A to +75A](https://core-electronics.com.au/acs709-current-sensor-carrier-75a-to-75a.html) | |---|---| **Dimensions** | Size: | 0.7" x 0.8" | |---|---| | Weight: | 1.0 g[1](https://core-electronics.com.au/#note1) | **General specifications** | Current sense: | 0.045 V/A[2](https://core-electronics.com.au/#note2) | |---|---| | Minimum logic voltage: | 3 V | | Maximum logic voltage: | 5.5 V | | Supply current: | 4 mA | **Identifying markings** | PCB dev codes: | cs02b | |---|---| | Other PCB markings: | 0J7387, white box with green X | **Notes:** 1Without included optional header pins.2When Vcc is 3.3 V. This specification is proportional to Vcc. **File downloads** - **Allegro ACS711 current sensor datasheet (533k pdf)** - **Drill guide for ACS711EX Current Sensor Carrier (43k dxf)** This DXF drawing shows the locations of all of the board’s holes. ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/a/c/acs711ex_current_sensor_carrier_31a_to_31a__pololu_2453__00.jpg)