> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # ACS37030LLZATR-020B3 Current Sensor Compact Carrier -20A to +20A, 3.3V **Type:** Product page · **SKU:** POLOLU-5230 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/pololu-acs37030llzatr-020b3-current-sensor-compact-carrier-20a-3-3v.html ([markdown](https://core-electronics.com.au/pololu-acs37030llzatr-020b3-current-sensor-compact-carrier-20a-3-3v.html.md)) This is the compact version of a simple carrier for Allegro’s ACS37030LLZATR-020B3 electrically isolated current sensor that uses two signal paths—Hall... ## Pricing - **Price:** $20.05 (inc GST) — $18.23 AUD, exc GST - **Quantity discounts:** 10+ $17.50 (exc GST) · 25+ $16.95 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 28 and Aug 31. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-5230:1` (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-5230:1.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/0J13006_43871751368.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J13006_26376a874aa.jpg) | |---| | ACS37030 Current Sensor Compact Carrier (top) and Large Carrier (bottom) size comparison. | Pololu are 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 recommend 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. The following table lists the available ACS37030 carrier options: | | Pololu Item # | Part Suffix | Current Range | Sensitivity (mV/A) | Size | PCB Details | |---|---|---|---|---|---|---| | | | | | ![](https://core-electronics.com.au/attachments/localcontent/0J13008_34991fdef6.jpg) **Compact Carrier** | [\#5230](https://core-electronics.com.au/pololu-acs37030llzatr-020b3-current-sensor-compact-carrier-20a-3-3v.html) | 020B3 | [±20 A](https://core-electronics.com.au/pololu-acs37030llzatr-020b3-current-sensor-compact-carrier-20a-3-3v.html) | 66 | 0.7"×0.8" | 2 layers, 2-oz copper | | [\#5232](https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-compact-carrier-65a-3-3v-pololu.html) | 065B3 | [±65 A](https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-compact-carrier-65a-3-3v-pololu.html) | 20.3 | | | | ![](https://core-electronics.com.au/attachments/localcontent/0J13012_7240d2d61a.jpg) **Large Carrier** | [\#5235](https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-large-carrier-65a-3-3v-pololu.html) | 065B3 | [±65 A](https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-large-carrier-65a-3-3v-pololu.html) | 20.3 | 1.4"×1.2" | 6 layers, 2-oz copper | **Details for item #5230** | \| [ ![](https://core-electronics.com.au/attachments/localcontent/0J13009_426869e08da.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J13009_97771476a54.jpg) \| \|---\| \| ACS37030LLZATR-020B3 Current Sensor Compact Carrier -20A to +20A, 3.3V, bottom view. \| | \| [ ![](https://core-electronics.com.au/attachments/localcontent/0J13004_372628db2b7.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J13004_48158c79a32.jpg) \| \|---\|---\| \| ACS37030 Current Sensor Compact Carrier. \| | |---| This compact carrier features the ACS37030LLZATR-020B3, which is intended for nominal 3.3 V operation and is designed for bidirectional input current from -20 A to +20 A. This version can be visually distinguished from the other versions by the “20” printed on the bottom side, as shown in the left picture above. | Part Suffix | Range | Supply Voltage | Sensitivity | Zero Point | Size | PCB layers | |---|---|---|---|---|---|---| | 020B3 | ±20 A (bidirectional) | 3 V to 3.6 V | 66 mV/A | 1.65 V | 0.7"×0.8" | 2 | **Using the sensor** | [ ![](https://core-electronics.com.au/attachments/localcontent/0J13005_36280579100.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J13005_19839d737da.jpg) | |---| 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 66 mV per amp of input current, with positive current increasing the output voltage and negative current decreasing the output voltage: V OUT = 1.65 V + 0.066 V A · I P I P = V OUT – 1.65 V 0.066 V A = ( V OUT – 1.65 V ) · 15.2 A V 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** | [ ![](https://core-electronics.com.au/attachments/localcontent/0J13007_72079bfe15d.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J13007_284231f32c4.jpg) | |---| 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 ACS37030 compact carrier. | \| [ ![](https://core-electronics.com.au/attachments/localcontent/0J12620_113003e8247.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J12620_997416241d8.jpg) \| \|---\| | \| [ ![](https://core-electronics.com.au/attachments/localcontent/0J12618_148193a17b9.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J12618_11496126e2f.jpg) \| \|---\|---\| | |---| | \| [ ![](https://core-electronics.com.au/attachments/localcontent/0J12621_120968c46e7.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J12621_10269790837.jpg) \| | \| [ ![](https://core-electronics.com.au/attachments/localcontent/0J12619_15451b69e90.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J12619_13909899181.jpg) \| \|---\|---\| | |---| 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** | [ ![](https://core-electronics.com.au/attachments/localcontent/0J13002_412392ef8be.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J13002_534726b1bb1.png) | |---| | ACS37030 Current Sensor Carrier schematic diagram. | 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** | [ ![](https://core-electronics.com.au/attachments/localcontent/0J12693_10168035916.jpg) ](https://core-electronics.com.au/attachments/localcontent/0J12693_16469d48f3f.jpg) | |---| | Thermal image of a high-current test of a Pololu current sensor carrier (not necessarily this product). | 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 the ACS37030 compact carrier boards could conduct about 55 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, as can switching to the equivalent large carrier version. **Warning:** Exceeding temperature or current limits can cause **permanent damage** to the sensor. If you are measuring an average continuous current greater than 45 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: | | [![](https://core-electronics.com.au/attachments/localcontent/0J12196_65464dc7f2.jpg)](https://core-electronics.com.au/category/315/acs711-current-sensor-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J12505_6365e4c57b.jpg)](https://core-electronics.com.au/category/312/acs71240-current-sensor-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J12198_7408408fc7.jpg)](https://core-electronics.com.au/category/265/acs724-current-sensor-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J12601_632466cdc7.jpg)](https://core-electronics.com.au/category/319/acs37220-current-sensor-compact-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J12594_9421e065ee.jpg)](https://core-electronics.com.au/category/320/acs37220-current-sensor-large-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J13020_74871010ed.jpg)](https://core-electronics.com.au/category/332/acs37030-current-sensor-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J13019_12521a0973f.jpg)](https://core-electronics.com.au/category/332/acs37030-current-sensor-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J12530_6282f9aaf9.jpg)](https://core-electronics.com.au/category/316/acs72981-current-sensor-compact-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J12576_86315efa4c.jpg)](https://core-electronics.com.au/category/317/acs72981-current-sensor-large-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J12691_6119a8ecb6.jpg)](https://core-electronics.com.au/category/323/ct432-ct433-tmr-current-sensor-compact-carriers) | [![](https://core-electronics.com.au/attachments/localcontent/0J12692_8867971972.jpg)](https://core-electronics.com.au/category/324/ct432-ct433-tmr-current-sensor-large-carriers) | |---|---|---|---|---|---|---|---|---|---|---|---| | | [ACS711 Current Sensor Carriers](https://core-electronics.com.au/category/315/acs711-current-sensor-carriers) | [ACS71240 Current Sensor Carriers](https://core-electronics.com.au/category/312/acs71240-current-sensor-carriers) | [ACS724 Current Sensor Carriers](https://core-electronics.com.au/category/265/acs724-current-sensor-carriers) | [ACS37220 Current Sensor Compact Carriers](https://core-electronics.com.au/category/319/acs37220-current-sensor-compact-carriers) | [ACS37220 Current Sensor Large Carriers](https://core-electronics.com.au/category/320/acs37220-current-sensor-large-carriers) | [ACS37030 Current Sensor Compact Carriers](https://core-electronics.com.au/category/332/acs37030-current-sensor-carriers) | [ACS37030 Current Sensor Large Carriers](https://core-electronics.com.au/category/332/acs37030-current-sensor-carriers) | [ACS72981 Current Sensor Compact Carriers](https://core-electronics.com.au/category/316/acs72981-current-sensor-compact-carriers) | [ACS72981 Current Sensor Large Carriers](https://core-electronics.com.au/category/317/acs72981-current-sensor-large-carriers) | [CT432/CT433 TMR Current Sensor Compact Carriers](https://core-electronics.com.au/category/323/ct432-ct433-tmr-current-sensor-compact-carriers) | [CT432/CT433 TMR Current Sensor Large Carriers](https://core-electronics.com.au/category/324/ct432-ct433-tmr-current-sensor-large-carriers) | | Allegro Sensor | ACS711KEXT | ACS71240 | ACS724LLCTR | ACS37220 | ACS37030 | ACS72981xLR | CT432/CT433 | | Sensing technology | Hall effect | Hall effect | Hall effect | Hall effect | Hall effect + inductive coil | Hall effect | XtremeSense™ TMR (tunneling magnetoresistance) | | Logic voltage range | 3.0–5.5 V | 3.3V ver: 3.0–3.6 V 5V ver: 4.5–5.5 V | 4.5–5.5 V | 3.3V versions: 3.15–3.45 V 5V versions: 4.5–5.5 V | 3.0–3.6 V | 3.3V versions: 3.0–3.6 V 5V versions: 4.5–5.5 V | 3.3V versions: 3.0–3.6 V 5V versions: 4.75–5.5 V | | Family current range | 15.5–31 A | 10–50 A | 2.5–50 A | 100–200 A | 20–65 A | 50–200 A | 20–70 A | | Current range/ sensitivity of individual versions | Bidirectional:**(1)** [±15.5 A / 90 mV/A](https://core-electronics.com.au/acs711ex-current-sensor-carrier-15-5a-to-15-5a.html) [±31 A / 45 mV/A](https://core-electronics.com.au/acs711ex-current-sensor-carrier-31a-to-31a.html) | 3.3V Bidirectional: [±10 A / 132 mV/A](https://core-electronics.com.au/acs71240kexblt-010b3-current-sensor-carrier-10a-to-10a-33v.html) [±30 A / 44 mV/A](https://core-electronics.com.au/acs71240kexblt-030b3-current-sensor-carrier-30a-to-30a-33v.html) [±50 A / 26.4 mV/A](https://core-electronics.com.au/acs71240kexblt-050b3-current-sensor-carrier-50a-to-50a-33v.html) 5V Bidirectional: [±10 A / 200 mV/A](https://core-electronics.com.au/acs71240kexblt-010b5-current-sensor-carrier-10a-5v.html) [±30 A / 66 mV/A](https://core-electronics.com.au/acs71240kexblt-030b5-current-sensor-carrier-30a-5v.html) [±50 A / 40 mV/A](https://core-electronics.com.au/acs71240kexblt-050b5-current-sensor-carrier-50a-5v.html) 5V Unidirectional: [0–?50 A / 80 mv/A](https://core-electronics.com.au/acs71240kexblt-050u5-current-sensor-carrier-0a-to-50a-5v.html) | 5V Bidirectional:**(2)** [±2.5 A / 800 mV/A](https://core-electronics.com.au/acs724-current-sensor-carrier-25a-to-25a.html) [±5 A / 400 mV/A](https://core-electronics.com.au/current-sensor-carrier-acs724.html) [±10 A / 200 mV/A](https://core-electronics.com.au/acs724-current-sensor-carrier-10a-to-10a.html) [±20 A / 100 mV/A](https://core-electronics.com.au/acs724-current-sensor-carrier-20a-to-20a.html) [±30 A / 66 mV/A](https://core-electronics.com.au/acs724-current-sensor-carrier-30a-to-30a.html) [±50 A / 40 mV/A](https://core-electronics.com.au/acs724-current-sensor-carrier-50a-to-50a.html) 5V Unidirectional:**(2)** [0–?5 A / 800 mv/A](https://core-electronics.com.au/acs724-current-sensor-carrier-0a-to-5a.html) [0–?10 A / 400 mv/A](https://core-electronics.com.au/acs724-current-sensor-carrier-0-to-10a.html) [0–?20 A / 200 mv/A](https://core-electronics.com.au/acs724-current-sensor-carrier-0a-to-20a.html) [0–?30 A / 133 mV/A](https://core-electronics.com.au/acs724-current-sensor-carrier-0-to-30a.html) | 3.3V Bidirectional: [±100 A / 13.2 mV/A](https://core-electronics.com.au/acs37220-current-sensor-compact-carrier-100a-3-3v.html) [±150 A / 8.8 mV/A](https://core-electronics.com.au/acs37220-current-sensor-compact-carrier-150a-3-3v.html) 5V Bidirectional: [±100 A / 20 mV/A](https://core-electronics.com.au/acs37220lezatr-100b5-current-sensor-compact-carrier-100a-to-100a-5v.html) [±150 A / 13.3 mV/A](https://core-electronics.com.au/acs37220lezatr-150b5-current-sensor-compact-carrier-150a-to-150a-5v.html) [±200 A / 10 mV/A](https://core-electronics.com.au/acs37220lezatr-200b5-current-sensor-compact-carrier-200a-to-200a-5v.html) | 3.3V Bidirectional: [±100 A / 13.2 mV/A](https://core-electronics.com.au/acs37220lezatr-100b3-current-sensor-large-carrier-100a-to-100a-33v.html) [±150 A / 8.8 mV/A](https://core-electronics.com.au/acs37220-current-sensor-large-carrier-150a-3-3v.html) 5V Bidirectional: [±100 A / 20 mV/A](https://core-electronics.com.au/acs37220lezatr-100b5-current-sensor-large-carrier-100a-to-100a-5v.html) [±150 A / 13.3 mV/A](https://core-electronics.com.au/acs37220lezatr-150b5-current-sensor-large-carrier-150a-to-150a-5v.html) [±200 A / 10 mV/A](https://core-electronics.com.au/acs37220lezatr-200b5-current-sensor-large-carrier-200a-to-200a-5v.html) | 3.3V Bidirectional: [±20 A / 66 mV/A](https://core-electronics.com.au/pololu-acs37030llzatr-020b3-current-sensor-compact-carrier-20a-3-3v.html) [±65 A / 20.3 mV/A](https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-compact-carrier-65a-3-3v-pololu.html) | 3.3V Bidirectional: [±65 A / 20.3 mV/A](https://core-electronics.com.au/acs37030llzatr-065b3-current-sensor-large-carrier-65a-3-3v-pololu.html) | 3.3V Bidirectional:**(1)** [±50 A / 26.4 mV/A](https://core-electronics.com.au/acs72981llratr-050b3-current-sensor-compact-carrier-50a-to-50a-33v.html) [±100 A / 13.2 mV/A](https://core-electronics.com.au/acs72981llratr-100b3-current-sensor-compact-carrier-100a-to-100a-33v.html) [±150 A / 8.8 mV/A](https://core-electronics.com.au/acs72981klratr-150b3-current-sensor-compact-carrier-150a-to-150a-33v.html) [±200 A / 6.6 mV/A](https://core-electronics.com.au/acs72981-current-sensor-compact-carrier-200a-3-3v.html) 3.3V Unidirectional:**(1)** [0–?50 A / 52.8 mv/A](https://core-electronics.com.au/acs72981llratr-050u3-current-sensor-compact-carrier-0a-to-50a-33v.html) [0–?100 A / 26.4 mv/A](https://core-electronics.com.au/acs72981llratr-100u3-current-sensor-compact-carrier-0a-to-100a-33v.html) [0–?150 A / 17.6 mv/A](https://core-electronics.com.au/acs72981klratr-150u3-current-sensor-compact-carrier-0a-to-150a-33v.html) [0–?200 A / 13.2 mv/A](https://core-electronics.com.au/acs72981elratr-200u3-current-sensor-compact-carrier-0a-200a-3-3v.html) 5V Bidirectional:**(2)** [±50 A / 40 mV/A](https://core-electronics.com.au/acs72981llratr-050b5-current-sensor-compact-carrier-50a-to-50a-5v.html) [±100 A / 20 mV/A](https://core-electronics.com.au/acs72981llratr-100b5-current-sensor-compact-carrier-100a-to-100a-5v.html) [±150 A / 13.3 mV/A](https://core-electronics.com.au/acs72981klratr-150b5-current-sensor-compact-carrier-150a-to-150a-5v.html) [±200 A / 10 mV/A](https://core-electronics.com.au/acs72981elratr-200b5-current-sensor-compact-carrier-200a-5v.html) 5V Unidirectional:**(2)** [0–?100 A / 40 mv/A](https://core-electronics.com.au/acs72981llratr-100u5-current-sensor-compact-carrier-0a-to-100a-5v.html) [0–?150 A / 26.7 mv/A](https://core-electronics.com.au/acs72981klratr-150u5-current-sensor-compact-carrier-0a-to-150a-5v.html) | 3.3V Bidirectional:**(1)** [±50 A / 26.4 mV/A](https://core-electronics.com.au/acs72981llratr-050b3-current-sensor-large-carrier-50a-to-50a-33v.html) [±100 A / 13.2 mV/A](https://core-electronics.com.au/acs72981llratr-100b3-current-sensor-large-carrier-100a-to-100a-33v.html) [±150 A / 8.8 mV/A](https://core-electronics.com.au/acs72981klratr-150b3-current-sensor-large-carrier-150a-to-150a-33v.html) [±200 A / 6.6 mV/A](https://core-electronics.com.au/acs72981-current-sensor-large-carrier-200a-3-3v.html) 3.3V Unidirectional:**(1)** [0–?50 A / 52.8 mv/A](https://core-electronics.com.au/acs72981llratr-050u3-current-sensor-large-carrier-0a-to-50a-33v.html) [0–?100 A / 26.4 mv/A](https://core-electronics.com.au/acs72981llratr-100u3-current-sensor-large-carrier-0a-to-100a-33v.html) [0–?150 A / 17.6 mv/A](https://core-electronics.com.au/acs72981klratr-150u3-current-sensor-large-carrier-0a-to-150a-33v.html) [0–?200 A / 13.2 mv/A](https://core-electronics.com.au/acs72981-current-sensor-large-carrier-200a-3-3v-pololu.html) 5V Bidirectional:**(2)** [±50 A / 40 mV/A](https://core-electronics.com.au/acs72981llratr-050b5-current-sensor-large-carrier-50a-to-50a-5v.html) [±100 A / 20 mV/A](https://core-electronics.com.au/acs72981llratr-100b5-current-sensor-large-carrier-100a-to-100a-5v.html) [±150 A / 13.3 mV/A](https://core-electronics.com.au/acs72981klratr-150b5-current-sensor-large-carrier-150a-to-150a-5v.html) [±200 A / 10 mV/A](https://core-electronics.com.au/acs72981elratr-200b5-current-sensor-large-carrier-200a-5v.html) 5V Unidirectional:**(2)** [0–?100 A / 40 mv/A](https://core-electronics.com.au/acs72981llratr-100u5-current-sensor-large-carrier-0a-to-100a-5v.html) [0–?150 A / 26.7 mv/A](https://core-electronics.com.au/acs72981klratr-150u5-current-sensor-large-carrier-0a-150a-5v.html) | 3.3V Bidirectional: [±20 A / 50 mV/A](https://core-electronics.com.au/ct433-hswf20mr-tmr-current-sensor-compact-carrier-20a-3-3v.html) [±30 A / 33.3 mV/A](https://core-electronics.com.au/pololu-ct433-hswf30mr-current-sensor-30a-3-3v.html) [±50 A / 20 mV/A](https://core-electronics.com.au/pololu-ct433-hswf50mr-tmr-current-sensor-compact-carrier-50a-3-3v.html) [±70 A / 14.3 mV/A](https://core-electronics.com.au/pololu-ct433-hswf70mr-tmr-current-sensor-compact-carrier-70a-3-3v.html) 3.3V Unidirectional: [0–?20 A / 100 mv/A](https://core-electronics.com.au/pololu-ct433-hswf20dr-tmr-current-sensor-compact-carrier-0a-20a-3-3v.html) [0–?30 A / 66.7 mv/A](https://core-electronics.com.au/ct433-tmr-current-sensor-30a-compact-carrier-3-3v-unidirectional.html) [0–?50 A / 40 mv/A](https://core-electronics.com.au/pololu-ct433-hswf50dr-tmr-current-sensor-compact-carrier-0a-50a-3-3v.html) [0–?65 A / 30.8 mV/A](https://core-electronics.com.au/pololu-ct433-hswf65dr-tmr-current-sensor-compact-0a-65a-3-3v.html) 5V Bidirectional: [±20 A / 100 mV/A](https://core-electronics.com.au/pololu-ct432-hswf20mr-tmr-current-sensor-20a-5v.html) [±30 A / 66.7 mV/A](https://core-electronics.com.au/pololu-ct432-hswf30mr-tmr-current-sensor-30a-5v.html) [±50 A / 40 mV/A](https://core-electronics.com.au/pololu-ct432-hswf50mr-tmr-current-sensor-compact-carrier-50a-5v.html) [±65 A / 30.8 mV/A](https://core-electronics.com.au/pololu-ct432-current-sensor-compact-carrier-65a-5v.html) 5V Unidirectional: [0–?20 A / 200 mv/A](https://core-electronics.com.au/pololu-ct432-hswf20dr-tmr-current-sensor-compact-carrier-0a-20a-5v.html) [0–?30 A / 133.3 mv/A](https://core-electronics.com.au/pololu-ct432-hswf30dr-tmr-current-sensor-compact-carrier-30a-5v.html) [0–?50 A / 80 mv/A](https://core-electronics.com.au/pololu-ct432-hswf50dr-tmr-current-sensor-compact-carrier-0a-50a-5v.html) [0–?70 A / 57.1 mv/A](https://core-electronics.com.au/pololu-ct432-hswf70dr-tmr-current-sensor-compact-carrier-0a-70a-5v.html) | 3.3V Bidirectional: [±50 A / 20 mV/A](https://core-electronics.com.au/pololu-ct433-hswf50mr-tmr-current-sensor-large-carrier-50a-3-3v.html) [±70 A / 14.3 mV/A](https://core-electronics.com.au/pololu-ct433-hswf70mr-tmr-current-sensor-large-carrier-70a-3-3v.html) 3.3V Unidirectional: [0–?50 A / 40 mv/A](https://core-electronics.com.au/pololu-ct433-hswf50dr-tmr-current-sensor-large-carrier-0a-50a-3-3v.html) [0–?65 A / 30.8 mv/A](https://core-electronics.com.au/pololu-ct433-hswf65dr-tmr-current-sensor-large-carrier-0a-65a-3-3v.html) 5V Bidirectional: [±50 A / 40 mV/A](https://core-electronics.com.au/pololu-ct432-hswf50mr-tmr-current-sensor-large-carrier-50a-5v.html) [±65 A / 30.8 mV/A](https://core-electronics.com.au/pololu-ct432-hswf65mr-tmr-current-sensor-65a-5v.html) 5V Unidirectional: [0–?50 A / 80 mv/A](https://core-electronics.com.au/ct432-hswf50dr-tmr-current-sensor-large-carrier-0a-50a-5v.html) [0–?70 A / 57.1 mv/A](https://core-electronics.com.au/pololu-ct432-hswf70dr-tmr-current-sensor-70a-5v.html) | | IC current path resistance | 0.6 mO | 0.6 mO | 0.6 mO | 0.1 mO | 0.7 mO | 0.2 mO | 1 mO | | 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 | 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 | 5 MHz | 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" | 0.7" × 0.8" | 1.4" × 1.2" | 0.8" × 1.1" | 1.4" × 1.2" | | Overcurrent fault output | | | | User-configurable threshold | | | | Common-mode field rejection | | | | | | | | | Nonratiometric output | | | | | | | | **(1)** Sensitivity when Vcc = 3.3 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc). **(2)** Sensitivity when Vcc = 5 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc). **(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 a 4-layer PCB; all other versions use a 2-layer PCB. **Dimensions** | Size: | 0.7" × 0.8" | |---|---| | Weight: | 1.2 g | **General specifications** | Typical operating voltage: | 3.3 V | |---|---| | Current sense: | 66 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: | -?20A to +20A (bidirectional 20A), 3.3V | | Current sensor: | Allegro ACS37030LLZATR-020B3 | **Identifying markings** | PCB dev codes: | cs09a | |---|---| | Other PCB markings: | 0J15202 | | Other PCB markings: | 20 | **Notes:** 1 Typical. **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 Compact Carriers (3MB step)** - **Drill guide for the ACS37030 Current Sensor Compact Carriers (19k 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-5230-1.jpg)