This is the compact version of a simple carrier for Allegro’s ACS37200LLXTR-200B3 Hall effect-based, electrically isolated current sensor that offers an extra-low-resistance (~0.05 mΩ) IC current path, a 150 kHz bandwidth with <4 µs response time, and an overcurrent fault output with a user-conf...
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This is the compact version of a simple carrier for Allegro’s ACS37200LLXTR-200B3 Hall effect-based, electrically isolated current sensor that offers an extra-low-resistance (~0.05 mΩ) IC current path, a 150 kHz bandwidth with <4 µs response time, and an overcurrent fault output with a user-configurable threshold.
| Part Suffix | Range | Supply Voltage | Sensitivity | Zero Point | Size | PCB layers |
|---|---|---|---|---|---|---|
| 200B3 | ±200 A (bidirectional) | 3.15 V to 3.45 V | 6.6 mV/A | 1.65 V | 0.8″×1.1″ | 2 |
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Basic board dimensions of the ACS37200 Current Sensor Compact Carrier.
We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS37200 Hall effect-based, electrically isolated current sensors with user-configurable overcurrent fault output; we therefore recommend careful reading of the ACS37200 datasheet (1MB pdf) before using this product. The following list details some of the sensor’s key features:
The connection points and the direction interpreted as positive current flow (via the +i arrow) are labelled on the silkscreen.
The following table lists the available ACS37200 carrier options:
| Supply Voltage (V) |
Current Range |
Sensitivity (mV/A) |
Part Suffix | Pololu Item # |
Size | PCB Details |
Isolation Rating (1) |
Min PCB Creepage (2) |
Price | |
|---|---|---|---|---|---|---|---|---|---|---|
 Compact Carrier |
3.15 to 3.45 (3.3 nominal) |
±100 A | 13.2 | 100B3 | #5780 (coming soon) | 0.8″×1.1″ | 2 layers, 2-oz copper |
1097 VRMS | 10.1 mm | $19.95 |
| ±150 A | 8.8 | 150B3 | #5781 (coming soon) | |||||||
| ±200 A | 6.6 | 200B3 | #5782 | |||||||
| 4.5 to 5.5 (5 nominal) |
±100 A | 20 | 100B5 | #5783 | ||||||
| ±150 A | 13.3 | 150B5 | #5784 (coming soon) | |||||||
| ±200 A | 10 | 200B5 | #5785 (coming soon) | |||||||
| 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. | ||||||||||
Alternatives available with variations in these parameter(s): current range Select variant…
ACS37200LLXTR-200B3 Current Sensor Compact Carrier -200A to +200A, 3.3V, bottom view. |
ACS37200 Current Sensor Compact Carrier. (1) |
This compact carrier features the ACS37200LLXTR-200B3, which is intended for nominal 3.3 V operation and is designed for bidirectional input current from -200 A to +200 A. This version can be visually distinguished from the other versions by the “20B3” printed on the bottom side, as shown in the left picture above.
| Part Suffix | Range | Supply Voltage | Sensitivity | Zero Point | Size | PCB layers |
|---|---|---|---|---|---|---|
| 200B3 | ±200 A (bidirectional) | 3.15 V to 3.45 V | 6.6 mV/A | 1.65 V | 0.8″×1.1″ | 2 |
Pinout of the ACS37200 Current Sensor Compact Carrier.
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 3.15 V to 3.45 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 6.6 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) + 0.0066 text(V)/text(A) * I_"P"``
``I_"P" = (V_"OUT" – 1.65 text(V)) / (0.0066 text(V)/text(A)) = (V_"OUT" – 1.65 text(V)) * 152 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.
The carrier board also includes two optional connection points, marked in red in the picture above, for taking a 4-wire measurement of the IC current path resistance. This is to more conveniently evaluate that property of the chip and is not required for normal use of this product as a current sensor.
The optional VOC pin can be used to set the overcurrent fault threshold. An on-board 130 kΩ resistor between VOC and GND sets the default overcurrent fault threshold to approximately 200% of the nominal sensing range, and an external resistor can be added in parallel between VOC and GND to lower this threshold to between 50% and 200%. The following equation gives the value of this parallel resistor, ROC, in kΩ as a function of overcurrent fault threshold percentage P:
``R_"OC" = (130 text(kΩ) * P) / (197% – P)``
So for example, to set the overcurrent fault limit to 50% of the nominal sensing range, a 44 kΩ external resistor can be added between VOC and GND:
``R_"OC" = (130 text(kΩ) * 50%) / (197% – 50%) ~~ 44 text(kΩ)``
As a shortcut, VOC can be connected directly to ground to set the overcurrent fault limit to 100% of the nominal sensing range.
The optional FAULT pin is normally at VDD and is pulled low when the IP current magnitude exceeds the set overcurrent fault threshold in either direction. This pin only asserts while the fault condition is present (it is not latched).
We manufacture these boards in-house at our Las Vegas facility, which gives us the flexibility to make these current sensors with custom default overcurrent fault thresholds. If you are interested in customisation, please contact us.
Basic hole spacing and dimensions of the ACS37200 Current Sensor Compact Carrier.
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 8 AWG wires or #8 or M4 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 are generally not suitable for high currents and could limit the usable range of the sensor. The pictures below show examples of various connection options with the CT432/CT433 compact carrier, which has the same physical dimensions as the ACS37200 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
The ACS37200 has a manufacturer-rated basic working isolation voltage of 1097 VRMS. The IC package has a creepage of 8 mm, and our carrier PCB has a routed slot under the IC to provide a PCB creepage distance of 10.1 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 diagram of the ACS37200 Current Sensor Compact Carrier.
The dimension diagram is available as a downloadable PDF (358k pdf).
Thermal image of a high-current test of a Pololu current sensor carrier (not necessarily this product).
Depending on the version, the ACS37200 can measure up to ±200 A. However, the sensor chip can overheat at lower currents. In our tests, we found that our ACS37200 compact carrier boards could conduct about 45 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 40 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:
| CT220 ContactlessCurrent SensorCarriers | ACS3704xCurrent SensorMicro Carriers | ACS3704xCurrent SensorCompact Carriers | ACS711 CurrentSensor Carriers | ACS71240 CurrentSensor Carriers | ACS724 CurrentSensor Carriers | ACS37100 TMRCurrent SensorCompact Carriers | ACS37030LZCurrent SensorCompact Carriers | ACS37030MYCurrent SensorCompact Carriers | CT432/CT433 TMRCurrent SensorCompact Carriers | |
|---|---|---|---|---|---|---|---|---|---|---|
| Allegro Sensor | CT220xMV-HS5 | ACS3704x | ACS711KEXT | ACS71240 | ACS724LLCTR | ACS37100 | ACS37030LLZ | ACS37030LMY | CT432/CT433 | |
| Sensing technology | XtremeSense™ TMR (tunneling magnetoresistance) |
Hall effect | Hall effect | Hall effect | Hall effect | XtremeSense™ TMR (tunneling magnetoresistance) |
Hall effect + inductive coil | XtremeSense™ TMR (tunneling magnetoresistance) |
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| Logic voltage range | 2.7–5.5 V | 3.3V versions: 3.0–3.6 V 5V versions: 4.75–5.5 V |
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 | 3.0–3.6 V | 3.0–3.6 V | 3.3V ver: 3.0–3.6 V 5V ver: 4.75–5.5 V |
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| Family current range | 10–800 A | 10–30 A | 15.5–31 A | 10–50 A | 2.5–50 A | 25–50 A | 20–65 A | 20–70 A | ||
| Range/sensitivity of individual versions | (2) ±1.5 mT / 1500 mV/mT ±15 mT / 150 mV/mT |
ACS37041: 3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66.7 mV/A ACS37042: 3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66.7 mV/A |
ACS37041: 3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66.7 mV/A ACS37042: 3.3V Bidirectional: ±10 A / 132 mV/A ±30 A / 44 mV/A 5V Bidirectional: ±10 A / 200 mV/A ±30 A / 66.7 mV/A |
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: ±25 A / 52.8 mV/A ±50 A / 26.4 mV/A |
3.3V Bidirectional: ±20 A / 66 mV/A ±40 A / 33 mV/A ±65 A / 20.3 mV/A |
3.3V Bidirectional: ±20 A / 66 mV/A ±40 A / 33 mV/A ±65 A / 20.3 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 |
| Max bandwidth | 30 kHz | 150 kHz | 100 kHz | 120 kHz | 120 kHz(3) | 10 MHz | 5 MHz | 1 MHz | ||
| IC current path resistance | N/A (contactless) | 1.6 mΩ | 0.6 mΩ | 0.6 mΩ | 0.6 mΩ | 1.2 mΩ | 0.7 mΩ | 0.9 mΩ | 1 mΩ | |
| IC isolation rating(6) | N/A (contactless) | ACS37041: 100 VRMS ACS37042: 285 VRMS |
100 Vpk | 100 Vpk | 297 VRMS | 1097 VRMS | 840 VRMS | 1000 VRMS | 1100 VRMS | |
| Minimum PCB creepage(7) | N/A (contactless) | ACS37041: 1.6 mm ACS37042: 2.0 mm |
ACS37041: 1.6 mm ACS37042: 3.0 mm |
0.75 mm | 0.75 mm | 1.1 mm | 9.3 mm | 4.1 mm | 11.7 mm | 8 mm |
| PCB | N/A (contactless) | 2 layers, 1-oz copper |
2 layers, 2-oz copper |
2 layers, 2-oz copper |
2 layers, 2-oz copper |
2 layers, 2- or 4-oz copper(4) |
2 layers, 2-oz copper |
2 layers, 2-oz copper |
2 or 4 layers(5), 2-oz copper |
|
| Size | 0.4″ × 0.62″ | 0.3″ × 0.4″ | 0.7″ × 0.8″ | 0.7″ × 0.8″ | 0.7″ × 0.8″ | 0.7″ × 0.8″ | 0.8″ × 1.1″ | 0.7″ × 0.8″ | 0.8″ × 1.1″ | 0.8″ × 1.1″ |
| Overcurrent fault output |
(configurable threshold) | |||||||||
| Common-mode field rejection | ||||||||||
| Nonratiometric output | ||||||||||
| 1-piece price | $4.95 | $4.15 – $4.69 | $4.45 – $4.99 | $4.85 | $5.25 | $9.95 – $11.49 | $14.95 | $11.95 | $12.95 | $12.95 |
Note 1: Sensitivity when Vcc = 3.3 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc).
Note 2: Sensitivity when Vcc = 5 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc).
Note 3: Bandwidth can be reduced by adding a filter capacitor.
Note 4: 50A version of this carrier uses 4-oz copper PCB; all other versions of this carrier use 2-oz copper.
Note 5: 50A and higher versions of this carrier use a 4-layer PCB; all other versions of this carrier use a 2-layer PCB.
Note 6: IC component rating per manufacturer datasheet.
Note 7: Minimum creepage along PCB surface based on layout design only. Other creepage distances, e.g. along the body of the component, may be lower.
| ACS37030LZCurrent SensorCompact Carriers | ACS37030LZCurrent SensorLarge Carriers | ACS37030MYCurrent SensorCompact Carriers | ACS37030MYCurrent SensorLarge Carriers | CT432/CT433 TMRCurrent SensorCompact Carriers | CT432/CT433 TMRCurrent SensorLarge Carriers | ACS72981Current SensorCompact Carriers | ACS72981Current SensorLarge Carriers | ACS37220Current SensorCompact Carriers | ACS37220Current SensorLarge Carriers | |
|---|---|---|---|---|---|---|---|---|---|---|
| Allegro Sensor | ACS37030LLZ | ACS37030LMY | CT432/CT433 | ACS72981xLR | ACS37220 | |||||
| Sensing technology | Hall effect + inductive coil | XtremeSense™ TMR (tunneling magnetoresistance) |
Hall effect | Hall effect | ||||||
| Logic voltage range | 3.0–3.6 V | 3.3V versions: 3.0–3.6 V 5V versions: 4.75–5.5 V |
3.3V versions: 3.0–3.6 V 5V versions: 4.5–5.5 V |
3.3V versions: 3.15–3.45 V 5V versions: 4.5–5.5 V |
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| Family current range | 20–65 A | 20–70 A | 50–200 A | 100–200 A | ||||||
| Range/sensitivity of individual versions | 3.3V Bidirectional: ±20 A / 66 mV/A ±40 A / 33 mV/A ±65 A / 20.3 mV/A |
3.3V Bidirectional: ±40 A / 33 mV/A ±65 A / 20.3 mV/A |
3.3V Bidirectional: ±25 A / 52.8 mV/A ±40 A / 33 mV/A ±65 A / 20.3 mV/A |
3.3V Bidirectional: ±40 A / 33 mV/A ±65 A / 20.3 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 |
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) 0–50 A / 80 mv/A 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) 0–50 A / 80 mv/A 0–100 A / 40 mv/A 0–150 A / 26.7 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 |
| Max bandwidth | 5 MHz | 1 MHz | 250 kHz | 150 kHz | ||||||
| IC current path resistance | 0.7 mΩ | 0.9 mΩ | 1 mΩ | 0.2 mΩ | 0.1 mΩ | |||||
| IC isolation rating(4) | 840 VRMS | 1000 VRMS | 1100 VRMS | 100 Vpk | 100 VRMS | |||||
| Minimum PCB creepage(5) | 4.1 mm | 11.7 mm | 11.9 mm | 8 mm | 1.1 mm | 1.0 mm | ||||
| PCB | 2 layers, 2-oz copper |
6 layers, 2-oz copper |
2 layers, 2-oz copper |
6 layers, 2-oz copper |
2 or 4 layers(3), 2-oz copper |
6 layers, 2-oz copper |
6 layers, 2-oz copper |
6 layers, 2-oz copper |
2 layers, 2-oz copper |
6 layers, 2-oz copper |
| Size | 0.7″ × 0.8″ | 1.4″ × 1.2″ | 0.8″ × 1.1″ | 1.4″ × 1.2″ | 0.8″ × 1.1″ | 1.4″ × 1.2″ | 0.7″ × 0.8″ | 1.4″ × 1.2″ | 0.7″ × 0.8″ | 1.4″ × 1.2″ |
| Overcurrent fault output |
(configurable threshold) | |||||||||
| Common-mode field rejection | ||||||||||
| Nonratiometric output | ||||||||||
| 1-piece price | $11.95 | $14.95 | $12.95 | $17.95 | $12.95 | $16.95 | $13.95 | $16.95 | $6.95 | $10.95 |
Note 1: Sensitivity when Vcc = 3.3 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc).
Note 2: Sensitivity when Vcc = 5 V; actual sensitivity is ratiometric (i.e. it is proportional to Vcc).
Note 3: 50A and higher versions of this carrier use a 4-layer PCB; all other versions of this carrier use a 2-layer PCB.
Note 4: IC component rating per manufacturer datasheet.
Note 5: Minimum creepage along PCB surface based on layout design only. Other creepage distances, e.g. along the body of the component, may be lower.
You can also use the following selection box to see these options sorted by current range:
Alternatives available with variations in these parameter(s): current range Select variant…
| Size: | 0.8″ × 1.1″ |
|---|---|
| Weight: | 2.1 g |
| Typical operating voltage: | 3.3 V |
|---|---|
| Current sense: | 6.6 mV/A |
| Minimum logic voltage: | 3.15 V |
| Maximum logic voltage: | 3.45 V |
| Supply current: | 20 mA1 |
| Current range: | -200A to +200A (bidirectional 200A), 3.3V |
| Current sensor: | Allegro ACS37200LLXTR-200B3 |
| PCB dev codes: | cs12a |
|---|---|
| Other PCB markings: | 0J16004 |
| Other PCB markings: | 20B3 |
Allegro product page for the ACS37200, where you can find the latest datasheet, application notes, and additional resources.
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