This is the compact version of a simple carrier for Allegro’s ACS37030LLZATR-020B3 electrically isolated current sensor that uses two signal paths—Hall effect and inductive coil—to capture both low-frequency and high-frequency information.
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Our Code: SKU-010760
Supplier Link: [Pololu MPN:5230]
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ACS37030 Current Sensor Compact Carrier (top) and Large Carrier (bottom) size comparison.
We 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; we therefore recommend careful reading of the ACS37030 datasheet before using this product. The following list details some of the sensor’s key features:
The connection points are labelled 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 |
Price | |
|---|---|---|---|---|---|---|---|
 Compact Carrier |
#5230 | 020B3 | ±20 A | 66 | 0.7″×0.8″ | 2 layers, 2-oz copper |
$7.95 |
| #5232 | 065B3 | ±65 A | 20.3 | ||||
 Large Carrier |
#5235 | 065B3 | ±65 A | 20.3 | 1.4″×1.2″ | 6 layers, 2-oz copper |
$10.95 |
Alternatives available with variations in these parameter(s): current range Select variant…
ACS37030LLZATR-020B3 Current Sensor Compact Carrier -20A to +20A, 3.3V, bottom view. |
ACS37030 Current Sensor Compact Carrier. (1) |
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 |
ACS37030 Current Sensor Compact Carrier pinout.
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 labelled on the bottom silkscreen. The sensor outputs an analogue voltage on VOUT that is centred 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 text(V) + 0.066 text(V)/text(A) * I_"P"``
``I_"P" = (V_"OUT" – 1.65 text(V)) / (0.066 text(V)/text(A)) = (V_"OUT" – 1.65 text(V)) * 15.2 text(A)/text(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.
ACS37030 Current Sensor Compact Carrier basic hole dimensions.
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 or 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, which has the same physical dimensions as the ACS37030 compact carrier.
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The VREF, VOUT, VDD, and GND pins work with 0.1″-pitch header pins and are compatible with standard solderless breadboards
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.
ACS37030 Current Sensor Carrier schematic diagram.
The dimension diagram is available as a downloadable PDF (421k pdf).
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Thermal image of a high-current test of a Pololu current sensor carrier (not necessarily this product). |
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Depending on the version, the ACS37220 can measure up to ±65 A. However, the sensor chip can overheat at lower currents. In our tests, we found that our ACS37030 compact carrier boards could conduct about 55 A continuously without reaching the thermal limit for the IC. Our 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, we 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.
We have a variety of current sensors available with different ranges, sensitivities, and features. The table below summarizes our selection of active and preferred options:
| ACS711 CurrentSensor Carriers | ACS71240 CurrentSensor Carriers | ACS724 CurrentSensor Carriers | ACS37220Current SensorCompact Carriers | ACS37220Current SensorLarge Carriers | ACS37030Current SensorCompact Carriers | ACS37030Current SensorLarge Carriers | ACS72981Current SensorCompact Carriers | ACS72981Current SensorLarge Carriers | CT432/CT433 TMRCurrent SensorCompact Carriers | CT432/CT433 TMRCurrent SensorLarge Carriers | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Sensor IC | Allegro ACS711KEXT |
Allegro ACS71240 |
Allegro ACS724LLCTR |
Allegro ACS37220 | Allegro ACS37030 | Allegro ACS72981xLR | Allegro CT432/CT433 | ||||
| Sensing technology | Hall effect | Hall effect | Hall effect | Hall effect | Hall effect + inductive coil | Hall effect | XtremeSense™ TMR (tunneling magnetoresistance) |
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| Logic voltage range (V) | 3.0–5.5 | 3.3V versions: 3.0–3.6 5V versions: 4.5–5.5 |
4.5–5.5 | 3.3V versions: 3.15–3.45 5V versions: 4.5–5.5 |
3.0–3.6 | 3.3V versions: 3.0–3.6 5V versions: 4.5–5.5 |
3.3V versions: 3.0–3.6 5V versions: 4.75–5.5 |
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| Current range / sensitivity | Bidirectional:(1) ±15.5 A / 90 mV/A ±31 A / 45 mV/A |
3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A ±50 A / 26.4 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66 mV/A ±50 A / 40 mV/A 5V Unidirectional: 0–50 A / 80 mv/A |
5V Bidirectional:(2) ±2.5 A / 800 mV/A ±5 A / 400 mV/A ±10 A / 200 mV/A ±20 A / 100 mV/A ±30 A / 66 mV/A ±50 A / 40 mV/A 5V Unidirectional:(2) 0–5 A / 800 mv/A 0–10 A / 400 mv/A 0–20 A / 200 mv/A 0–30 A / 133 mV/A |
3.3V Bidirectional: ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A 5V Bidirectional: ±100 A / 20 mV/A ±150 A / 13.3 mV/A ±200 A / 10 mV/A |
3.3V Bidirectional: ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A 5V Bidirectional: ±100 A / 20 mV/A ±150 A / 13.3 mV/A ±200 A / 10 mV/A |
3.3V Bidirectional: ±20 A / 66 mV/A ±65 A / 20.3 mV/A |
3.3V Bidirectional: ±65 A / 20.3 mV/A |
3.3V Bidirectional:(1) ±50 A / 26.4 mV/A ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A ±200 A / 6.6 mV/A 3.3V Unidirectional:(1) 0–50 A / 52.8 mv/A 0–100 A / 26.4 mv/A 0–150 A / 17.6 mv/A 0–200 A / 13.2 mv/A 5V Bidirectional:(2) ±50 A / 40 mV/A ±100 A / 20 mV/A ±150 A / 13.3 mV/A ±200 A / 10 mV/A 5V Unidirectional:(2) 0–100 A / 40 mv/A 0–150 A / 26.7 mv/A |
3.3V Bidirectional:(1) ±50 A / 26.4 mV/A ±100 A / 13.2 mV/A ±150 A / 8.8 mV/A ±200 A / 6.6 mV/A 3.3V Unidirectional:(1) 0–50 A / 52.8 mv/A 0–100 A / 26.4 mv/A 0–150 A / 17.6 mv/A 0–200 A / 13.2 mv/A 5V Bidirectional:(2) ±50 A / 40 mV/A ±100 A / 20 mV/A ±150 A / 13.3 mV/A ±200 A / 10 mV/A 5V Unidirectional:(2) 0–100 A / 40 mv/A 0–150 A / 26.7 mv/A |
3.3V Bidirectional: ±20 A / 50 mV/A ±30 A / 33.3 mV/A ±50 A / 20 mV/A ±70 A / 14.3 mV/A 3.3V Unidirectional: 0–20 A / 100 mv/A 0–30 A / 66.7 mv/A 0–50 A / 40 mv/A 0–65 A / 30.8 mv/A 5V Bidirectional: ±20 A / 100 mV/A ±30 A / 66.7 mV/A ±50 A / 40 mV/A ±65 A / 30.8 mV/A 5V Unidirectional: 0–20 A / 200 mv/A 0–30 A / 133.3 mv/A 0–50 A / 80 mv/A 0–70 A / 57.1 mv/A |
3.3V Bidirectional: ±50 A / 20 mV/A ±70 A / 14.3 mV/A 3.3V Unidirectional: 0–50 A / 40 mv/A 0–65 A / 30.8 mv/A 5V Bidirectional: ±50 A / 40 mV/A ±65 A / 30.8 mV/A 5V Unidirectional: 0–50 A / 80 mv/A 0–70 A / 57.1 mv/A |
| IC path resistance | 0.6 mΩ | 0.6 mΩ | 0.6 mΩ | 0.1 mΩ | 0.7 mΩ | 0.2 mΩ | 1 mΩ | ||||
| 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 | |||||||||||
| Non-ratiometric output | |||||||||||
| 1-piece price | $3.49 | $3.95 | $6.95 – $7.49 | $4.95 | $7.95 | $7.95 | $10.95 | $9.95 | $12.95 | $8.95 | $12.95 |
(1) Sensitivity when Vcc = 3.3 V; sensitivity is ratiometric.
(2) Sensitivity when Vcc = 5 V; sensitivity is ratiometric.
(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 4-layer PCB; all other versions use 2-layer PCB.
You can also use the following selection box to see all these options sorted by current range:
Alternatives available with variations in these parameter(s): current range Select variant…
| Size: | 0.7″ × 0.8″ |
|---|---|
| Weight: | 1.2 g |
| 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 mA1 |
| Current range: | -20A to +20A (bidirectional 20A), 3.3V |
| Current sensor: | Allegro ACS37030LLZATR-020B3 |
| PCB dev codes: | cs09a |
|---|---|
| Other PCB markings: | 0J15202 |
| Other PCB markings: | 20 |
This DXF drawing shows the locations of all of the board’s holes.
Allegro product page for the ACS37030, where you can find additional application notes and other resources.
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