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Full machine-readable index: https://core-electronics.com.au/llms.txt # ACS37042KLHBLT-010B3 Current Sensor Compact Carrier -10A to +10A, 3.3V **Type:** Product page · **SKU:** POLOLU-5454 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/acs37042klhblt-010b3-current-sensor-pololu-10a-3-3v.html ([markdown](https://core-electronics.com.au/acs37042klhblt-010b3-current-sensor-pololu-10a-3-3v.html.md)) This is the larger version of a simple carrier for Allegro’s ACS37042KLHBLT-010B3 Hall effect-based, electrically isolated current sensor in a 5-pin... ## Pricing - **Price:** $8.30 (inc GST) — $7.55 AUD, exc GST - **Quantity discounts:** 10+ $7.25 (exc GST) · 25+ $7.02 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 20 and Aug 24. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-5454:1` (comma-separated SKU:qty pairs) and share the link. 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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 Pololu are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS37041 and ACS37042 Hall effect-based, electrically isolated current sensors; Pololu therefore recommend careful reading of the [ACS37041/2 datasheet](https://core-electronics.com.au/attachments/localcontent/acs37041-2-datasheet_14287362b73.pdf) 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 galvanic isolation. - Low primary current path resistance of 1.6 mO in the sensor IC, so very little power is lost in the module. - 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. - High-bandwidth 150 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. - Integrated temperature compensation circuitry allows improved accuracy over the full operating temperature range. - Automotive-grade operating temperature range of -40°C to 125°C. - Carrier boards, available in micro (0.3?×0.4?) and Pololu's standard compact (0.7?×0.8?) sizes, offer 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. - ACS37042 ICs have a higher isolation rating and are on PCBs with routed slots for higher creepage. The connection points and the direction interpreted as positive current flow are labeled on the bottom silkscreen. The following table lists the available ACS37041 and ACS37042 carrier options: | | Pololu Item # | Part Suffix | Isolation Rating 1 | Supply Voltage | Current Range | Sensitivity (mV/A) | Zero Point | Size | PCB Details | Min PCB Creepage 2 | |---|---|---|---|---|---|---|---|---|---|---| | | | | | **Micro Carriers** | | [![](https://core-electronics.com.au/attachments/localcontent/0J13186_1542348b48.jpg) **ACS37041**](https://core-electronics.com.au/category/338/acs37041-current-sensor-micro-carriers) | \#5440 (coming June 2025) | 010B3 | 100 VRMS | 3.0 V to 3.6 V | ±10 A | 132 | 1.65 V | 0.3?×0.4? 7.6×10.2 mm | 2 layers, 1-oz copper | 1.6 mm | | [\#5441](https://core-electronics.com.au/acs37041klhblt-030b3-current-sensor-micro-carrier-30a-3-3v-pololu.html) | 030B3 | [±30 A](https://core-electronics.com.au/acs37041klhblt-030b3-current-sensor-micro-carrier-30a-3-3v-pololu.html) | 44 | | [\#5442](https://core-electronics.com.au/acs37041klhblt-010b5-current-sensor-micro-carrier-10a-5v-pololu.html) | 010B5 | 4.5 V to 5.5 V | [±10 A](https://core-electronics.com.au/acs37041klhblt-010b5-current-sensor-micro-carrier-10a-5v-pololu.html) | 200 | 2.5 V | | [\#5443](https://core-electronics.com.au/acs37041klhblt-030b5-current-sensor-micro-carrier-30a-5v-pololu.html) | 030B5 | [±30 A](https://core-electronics.com.au/acs37041klhblt-030b5-current-sensor-micro-carrier-30a-5v-pololu.html) | 66.7 | | [![](https://core-electronics.com.au/attachments/localcontent/0J13261_1529094b3f.jpg) **ACS37042**](https://core-electronics.com.au/category/344/acs37042-current-sensor-micro-carriers) | [\#5450](https://core-electronics.com.au/acs37042klhblt-010b3-current-sensor-micro-carrier-10a-3-3v-pololu.html) | 010B3 | 285 VRMS | 3.0 V to 3.6 V | [±10 A](https://core-electronics.com.au/acs37042klhblt-010b3-current-sensor-micro-carrier-10a-3-3v-pololu.html) | 132 | 1.65 V | 2.0 mm | | [\#5451](https://core-electronics.com.au/acs37042klhblt-030b3-current-sensor-micro-carrier-30a-3-3v-pololu.html) | 030B3 | [±30 A](https://core-electronics.com.au/acs37042klhblt-030b3-current-sensor-micro-carrier-30a-3-3v-pololu.html) | 44 | | \#5452 (coming June 2025) | 010B5 | 4.5 V to 5.5 V | ±10 A | 200 | 2.5 V | | \#5453 (coming June 2025) | 030B5 | ±30 A | 66.7 | | | | | | **Compact Carriers** | | [![](https://core-electronics.com.au/attachments/localcontent/0J13187_333924d2c9.jpg) **ACS37041**](https://core-electronics.com.au/category/339/acs37041-current-sensor-compact-carriers) | \#5444 (coming June 2025) | 010B3 | 100 VRMS | 3.0 V to 3.6 V | ±10 A | 132 | 1.65 V | 0.7?×0.8? 17.8×20.3 mm | 2 layers, 2-oz copper | 1.6 mm | | [\#5445](https://core-electronics.com.au/acs37041klhblt-030b3-current-sensor-compact-carrier-30a-3-3v-pololu.html) | 030B3 | [±30 A](https://core-electronics.com.au/acs37041klhblt-030b3-current-sensor-compact-carrier-30a-3-3v-pololu.html) | 44 | | [\#5446](https://core-electronics.com.au/acs37041klhblt-010b5-current-sensor-compact-carrier-10a-5v-pololu.html) | 010B5 | 4.5 V to 5.5 V | [±10 A](https://core-electronics.com.au/acs37041klhblt-010b5-current-sensor-compact-carrier-10a-5v-pololu.html) | 200 | 2.5 V | | [\#5447](https://core-electronics.com.au/acs37041klhblt-030b5-current-sensor-compact-carrier-30a-5v-pololu.html) | 030B5 | [±30 A](https://core-electronics.com.au/acs37041klhblt-030b5-current-sensor-compact-carrier-30a-5v-pololu.html) | 66.7 | | [![](https://core-electronics.com.au/attachments/localcontent/0J13257_34904092da.jpg) **ACS37042**](https://core-electronics.com.au/category/345/acs37042-current-sensor-compact-carriers) | [\#5454](https://core-electronics.com.au/acs37042klhblt-010b3-current-sensor-pololu-10a-3-3v.html) | 010B3 | 285 VRMS | 3.0 V to 3.6 V | [±10 A](https://core-electronics.com.au/acs37042klhblt-010b3-current-sensor-pololu-10a-3-3v.html) | 132 | 1.65 V | 3.0 mm | | [\#5455](https://core-electronics.com.au/acs37042klhblt-030b3-current-sensor-pololu-30a-3-3v.html) | 030B3 | [±30 A](https://core-electronics.com.au/acs37042klhblt-030b3-current-sensor-pololu-30a-3-3v.html) | 44 | | \#5456 (coming June 2025) | 010B5 | 4.5 V to 5.5 V | ±10 A | 200 | 2.5 V | | \#5457 (coming June 2025) | 030B5 | ±30 A | 66.7 | | | | Note 1: IC component rating per manufacturer datasheet. | | Note 2: Minimum creepage along PCB surface based on layout design only. Other creepage distances, e.g. along the body of the component, may be lower. | **Details for item #5454** This compact carrier features the ACS37042KLHBLT-010B3, which is intended for nominal 3.3 V operation 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 | Supply Voltage | Sensitivity | Zero Point | Size | PCB | |---|---|---|---|---|---|---| | 010B3 | ±10 A (bidirectional) | 3.0 V to 3.6 V | 132 mV/A | 1.65 V | 0.7?×0.8? | 2 layers, 2-oz copper | A smaller [**micro carrier**](https://core-electronics.com.au/acs37042klhblt-010b3-current-sensor-micro-carrier-10a-3-3v-pololu.html) is also available for this sensor IC for more space-constrained applications or to evaluate the IC’s performance with a small PCB area for thermal dissipation. **Using the sensor** This sensor has five required connections: the input current (IP+ and IP-), logic power (VDD and GND), and the sensor output (VOUT). The sensor requires a supply voltage of 3.0 V to 3.6 V to be connected across the VDD and GND pads, which are labeled on the bottom silkscreen. The sensor outputs an analog voltage on VOUT 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: ![](https://core-electronics.com.au/media/wysiwyg/pololu_current_sensor_equation.png) The output is not ratiometric, so the zero point and sensitivity are independent of the actual supply voltage. **Making connections to the board** You can insert the board into your current path in a variety of ways. For typical 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 10 AWG wires or #6 or M3.5 screws, and the second-largest through-holes (and mounting holes) are sized for 14 AWG wires or #2 or M2 screws. Holes with 0.1?, 3.5 mm, and 5 mm spacing are also 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), but please note that these connection options will generally not be suitable for the kinds of high currents intended for this sensor. The pictures below show examples of various connection options with the [ACS37220 compact carrier](https://core-electronics.com.au/category/319/acs37220-current-sensor-compact-carriers), which has the same physical dimensions as the ACS37041/ACS37042 compact carrier. The VOUT, VDD, and GND pins work with [0.1?-pitch header pins](https://core-electronics.com.au/0-100-2-54-mm-breakaway-male-header-1x40-pin-straight.html) and are compatible with standard [solderless breadboards](https://core-electronics.com.au/prototyping/breadboards.html) **Isolation rating and board creepage considerations** The ACS37041 and ACS37042 differ in their manufacturer-rated isolation voltages of 100 VRMS and 285 VRMS, respectively. The carrier PCBs for the ACS37042 ICs have routed slots under the IC bodies to increase the creepage distance between the isolated sections from 1.6 mm to 3.0 mm. A rough rule of thumb is that uncontaminated FR4 PCBs should have roughly 1 mm of creepage per 100 VRMS of isolation. Please note that these carrier boards are not certified to any particular safety standard. **Warning:** This product is generally intended for use below 30 V, and many of the application example pictures (e.g. use on a breadboard) are appropriate for such lower-voltage applications. These boards can be used at higher voltages, but 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** The dimension diagram is available as a [**downloadable PDF**](https://core-electronics.com.au/attachments/localcontent/acs37041-current-sensor-carriers-dimensions_41557dc1886.pdf) (416k pdf). **Real-world power dissipation considerations** In Pololu's tests, Pololu found that the micro carrier boards (cs08a and cs08c) could conduct about 25 A continuously, and compact carrier boards (cs08b and cs08d) could conduct about 30 A continuously, without reaching the thermal limit for the IC. Pololu's 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 20 A, Pololu 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** Pololu have a variety of current sensors available with different ranges, sensitivities, and features. The table below summarizes Pololu's selection of active and preferred options: You can also use the following selection box to see all these options sorted by current range: **Dimensions** | Size: | 0.7? × 0.8? | |---|---| | Weight: | 1.0 g | **General specifications** | Typical operating voltage: | 3.3 V | |---|---| | Current sense: | 132 mV/A | | Minimum logic voltage: | 3.0 V | | Maximum logic voltage: | 3.6 V | | Supply current: | 8 mA[1](https://core-electronics.com.au/#note1) | | Current range: | -?10A to +10A (bidirectional 10A), 3.3V | | Current sensor: | Allegro ACS37042KLHBLT-010B3 | | Base IC: | ACS37042 | **Identifying markings** | PCB dev codes: | cs08d | |---|---| | Other PCB markings: | 0J15457 | | Other PCB markings: | 3V3 B10 | **Notes:** 1 Typical. **File downloads** - **[Dimension diagram of the ACS3704x Current Sensor Carriers](https://core-electronics.com.au/attachments/localcontent/acs3704x-current-sensor-carriers-dimensions_68295632482.pdf) (683k pdf)** - **3D model of the ACS37041 Current Sensor Compact Carriers (3MB step)** - **Drill guide for the ACS37041 Current Sensor Compact Carriers (18k dxf)** This DXF drawing shows the locations of all of the board’s holes. - **3D model of the ACS37042 Current Sensor Compact Carriers (3MB step)** - **Drill guide for the ACS37042 Current Sensor Compact Carriers (18k dxf)** This DXF drawing shows the locations of all of the board’s holes. **Recommended links** - **[ACS37041/2 datasheet](https://core-electronics.com.au/attachments/localcontent/acs37041-2-datasheet_14287362b73.pdf)** - **[Allegro product page for the ACS37041 and ACS37042 Integrated Hall-Effect Current Sensors](https://www.allegromicro.com/en/products/sense/current-sensor-ics/zero-to-fifty-amp-integrated-conductor-sensor-ics/acs37041)** Allegro product page for the ACS37041/2, where you can find application notes and other resources. ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/P/O/POLOLU-5454-1.jpg)