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Full machine-readable index: https://core-electronics.com.au/llms.txt # ACS71240KEXBLT-010B3 Current Sensor Carrier -10A to +10A, 3.3V **Type:** Product page · **SKU:** POLOLU-5240 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/acs71240kexblt-010b3-current-sensor-carrier-10a-to-10a-33v.html ([markdown](https://core-electronics.com.au/acs71240kexblt-010b3-current-sensor-carrier-10a-to-10a-33v.html.md)) This board is a simple carrier of Allegro’s ACS71240KEXBLT-010B3 Hall effect-based linear current sensor, which offers a low-resistance (~0.6 mO) current... ## Pricing - **Price:** $8.85 (inc GST) — $8.05 AUD, exc GST - **Quantity discounts:** 10+ $7.73 (exc GST) · 25+ $7.48 (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-5240:1` (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-5240:1.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/0J12515_12614e74732.jpg) | |---| | [![](https://core-electronics.com.au/attachments/localcontent/0J12514_2029830c539.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12514_13402599cfd.jpg) | |---| Pololu are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS71240 Hall effect-based linear current sensors; Pololu therefore recommend careful reading of the [ACS71240 datasheet](https://core-electronics.com.au/attachments/localcontent/acs71240-datasheet_2398422c048.pdf) 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 0.6 mO, and the PCB is made with 2-oz copper, 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 120 kHz bandwidth for fast response times. - Overcurrent fault output with 1.5 µs response time indicates when the current exceeds the optimized operating range. - Output is not ratiometric (i.e. the zero point and sensitivity are independent of the actual supply voltage), which provides immunity from noisy supplies. - 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. 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 #5240** | \| [![](https://core-electronics.com.au/attachments/localcontent/0J12508_30739c653fa.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12508_22323481a88.jpg) \| \|---\| \| ACS71240KEXBLT-010B3 Current Sensor Carrier -10A to +10A, 3.3V, bottom view. \| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J12504_2601817844f.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12504_130573ddd25.jpg) \| \|---\|---\| \| ACS71240 Current Sensor Carrier. \| | |---| This carrier features the ACS71240KEXBLT-010B3, which operates at 3.3 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 “3V3 B10” printed on the bottom side, as shown in the left picture above. | Part Suffix | Range | Sensitivity | Fault Trip Level | Supply Voltage | |---|---|---|---|---| | 010B3 | ±10 A (bidirectional) | 132 mV/A | ±10 A | 3.3 V | **Using the sensor** | [![](https://core-electronics.com.au/attachments/localcontent/0J12506_33885677f04.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12506_1772443a8ef.jpg) | |---| 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 3.0 V to 3.6 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 1.65 V and changes by 132 mV per amp of input current, with positive current increasing the output voltage and negative current decreasing the output voltage: VIOUT=1.65V+0.132VA·IP IP=VIOUT–1.65V0.132VA=(VIOUT–1.65V)·7.58AV 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). | [![](https://core-electronics.com.au/attachments/localcontent/0J12507_3855758fa9c.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12507_153184331d7.jpg) | |---| 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](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 largest through-holes are big enough for #6 or M3.5 screws, and the second-largest through-holes (and mounting holes) are sized for #2 or M2 screws. | \| [![](https://core-electronics.com.au/attachments/localcontent/0J12509_1658227d2e4.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12509_1415307dcdb.jpg) \| \|---\| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J12510_1379928a80f.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12510_11910b1553c.jpg) \| \|---\|---\| | |---| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J12511_1285923e03e.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12511_117289276fe.jpg) \| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J12512_127231402fa.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12512_11162581332.jpg) \| \|---\|---\| | |---| **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. **Schematic and dimension diagrams** | [![](https://core-electronics.com.au/attachments/localcontent/0J12513_335083e7a33.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12513_214400a0fa5.png) | |---| | ACS72140 current sensor carrier schematic diagram. | The dimension diagram is available as a [**downloadable PDF**](https://core-electronics.com.au/attachments/localcontent/acs71240-current-sensor-carriers-dimensions_27449dcc586.pdf) (274k pdf). **Dimensions** | Size: | 0.7" x 0.8" | |---|---| | Weight: | 1.1 g | **General specifications** | Current sense: | 0.132 V/A | |---|---| | Minimum logic voltage: | 3.0 V | | Maximum logic voltage: | 3.6 V | | Supply current: | 12 mA[1](https://core-electronics.com.au/#note1) | | Version: | -10A to +10A (bidirectional 10A) | | Current sensor: | Allegro ACS71240KEXBLT-010B3 | **Identifying markings** | PCB dev codes: | cs02b | |---|---| | Other PCB markings: | 0J7387 | | Other PCB markings: | 3V3 B10 | **Notes:** 1 Max. **File downloads** - **[Dimension diagram of the ACS71240 Current Sensor Carrier](https://core-electronics.com.au/attachments/localcontent/acs71240-current-sensor-carriers-dimensions_27449dcc586.pdf) (274k pdf)** - **3D model of the ACS711EX and ACS71240 Current Sensor Carrier (3MB step)** - **Drill guide for ACS711EX and ACS71240 Current Sensor Carrier (18k dxf)** This DXF drawing shows the locations of all of the board’s holes. **Recommended links** - **[ACS71240 datasheet](https://core-electronics.com.au/attachments/localcontent/acs71240-datasheet_2398422c048.pdf)** - **[Allegro Application Note AN296169: Characterizing System Bandwidth in Complex Current Sensor Applications](https://www.allegromicro.com/en/insights-and-innovations/technical-documents/hall-effect-sensor-ic-publications/an-effective-method-for-characterizing-system-bandwidth-an296169)** This is the application note referenced on page 16 of the ACS724 datasheet and page 22 of the ACS71240 datasheet. The ACS720 is used validate the test methods presented, but these same methods and principles would also apply to the ACS724 and the ACS71240. - **[Allegro product page for the ACS71240 Hall-based Current Sensor](https://core-electronics.com.au/achs-7125-current-sensor-carrier-50a-to-50a.html)** Allegro product page for the ACS71240, where you can find additional application notes and other resources. ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/P/O/POLOLU-5240-1.jpg)