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# ACS37030LLZATR-065B3 Current Sensor Large Carrier -65A to +65A, 3.3V

**Type:** Product page · **SKU:** POLOLU-5235 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-large-carrier-65a-3-3v-pololu.html ([markdown](https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-large-carrier-65a-3-3v-pololu.html.md))

This is the large version of a simple carrier for Allegro’s ACS37030LLZATR-065B3 electrically isolated current sensor that uses two signal paths—Hall...

## Pricing

- **Price:** $25.10 (inc GST) — $22.82 AUD, exc GST
- **Quantity discounts:** 10+ $21.91 (exc GST) · 25+ $21.22 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 28 and Aug 31.

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## Description

Pololu is offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS37030 DC to 5 MHz bandwidth, galvanically isolated, high-accuracy current sensors with reference output; Pololu therefore recommends careful reading of the [ACS37030 datasheet](https://core-electronics.com.au/attachments/localcontent/acs37030-32-datasheet_12231be1533.pdf) before using this product. The following list details some of the sensor’s key features:

- 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.
- High bandwidth (DC to 5 MHz) analog voltage output proportional to the current.
- 40 ns typical response time.
- Two current signal paths:
    - Hall effect-based sensor for capturing DC and low-frequency current information
    - Inductive coil for capturing high-frequency current information.
- 0.7 mO primary current path resistance in the sensor IC, and the PCB is made with 2-layer (compact versions) or 6-layer (large versions) 2-oz copper, 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.
- Output is not ratiometric (i.e. the zero point and sensitivity are independent of the actual supply voltage), which provides immunity from noisy supplies.
- VREF output for pseudo-differential signaling in noisy application environments.
- Integrated digital temperature compensation circuitry allows improved accuracy over the full operating temperature range.
- Automotive-grade operating temperature range of -40°C to 150°C.
- Carrier boards, available in compact and large 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.

The connection points are labeled on the silkscreen, which is on the bottom side of the compact versions and on both sides of the large versions. The bottom silkscreen also shows the direction that is interpreted as positive current flow via the **+i** arrow.

**Details for item #5235**

This large carrier features the ACS37030LLZATR-065B3, which is intended for nominal 3.3 V operation and is designed for bidirectional input current from -65 A to +65 A. This version can be visually distinguished from the other versions by the “65” printed on the bottom side.

A [**compact carrier**](https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-compact-carrier-65a-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 smaller PCB area and fewer copper layers 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 20.3 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-5235.png)

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

The zero-current reference voltage, which is available on VREF, can be used to reduce errors due to reference shifts or noise on the ground line.

**Making connections to the board**

You can insert the board into your current path in a variety of ways. The largest through-holes are 8.4 mm in diameter with 20 mm spacing. These can be used with 5/16" or M8 screws for attaching various types of lugs or solderless ring terminals, or thick wires up to 2 AWG can be soldered directly to the board. The slots near the edge of the board can accommodate a 4-pin terminal block or other connector with a pitch between 7.5 mm and 9.5 mm. Examples of these kinds of connections are shown in the pictures below of the [ACS72981 large carrier](https://core-electronics.com.au/category/317/acs72981-current-sensor-large-carriers), which has the same physical dimensions as the ACS37030 large carrier. Holes with 0.1", 3.5 mm, and 5 mm spacing are also available 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 smaller connection options are generally not suitable for high currents like those this sensor is intended for.

The VREF, 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).

**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**

The dimension diagram is available as a [**downloadable PDF**](https://core-electronics.com.au/attachments/localcontent/acs37030-current-sensor-carriers-dimensions_42116c2102f.pdf) (421k pdf).

**Real-world power dissipation considerations**

Depending on the version, the ACS37220 can measure up to ±65 A. However, the sensor chip can overheat at lower currents. In Pololu's tests, Pololu found that Pololu's ACS37030 large carrier boards could conduct 60 A continuously while staying well below 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 50 A, Pololu strongly recommends 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 has a variety of current sensors available with different ranges, sensitivities, and features. The table below summarizes Pololu's selection of active and preferred options:

**Dimensions**

| Size: | 1.4" × 1.2" |
|---|---|
| Weight: | 4 g |

**General specifications**

| Typical operating voltage: | 3.3 V |
|---|---|
| Current sense: | 20.3 mV/A |
| Minimum logic voltage: | 3.0 V |
| Maximum logic voltage: | 3.6 V |
| Supply current: | 20 mA[1](https://core-electronics.com.au/#note1) |
| Current range: | -?65A to +65A (bidirectional 65A), 3.3V |
| Current sensor: | Allegro ACS37030LLZATR-065B3 |

**Identifying markings**

| PCB dev codes: | cs09b |
|---|---|
| Other PCB markings: | 0J15203 |
| Other PCB markings: | 65 |

**Notes:**

1Typical.**File downloads**

- **[Dimension diagrams of the ACS37030 Current Sensor Carriers](https://core-electronics.com.au/attachments/localcontent/acs37030-current-sensor-carriers-dimensions_42116c2102f.pdf) (421k pdf)**
- **3D model of the ACS37030 Current Sensor Large Carriers (3MB step)**
- **Drill guide for the ACS37030 Current Sensor Large Carriers (20k dxf)**
    
    This DXF drawing shows the locations of all of the board’s holes.

**Recommended links**

- **[ACS37030 datasheet](https://core-electronics.com.au/attachments/localcontent/acs37030-32-datasheet_12231be1533.pdf)**
- **[Allegro product page for the ACS37030 5 MHz Current Sensor](https://www.allegromicro.com/en/products/sense/current-sensor-ics/zero-to-fifty-amp-integrated-conductor-sensor-ics/acs37030-2)**
    
    Allegro product page for the ACS37030, 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-5235-1.jpg)