This is the large version of a simple carrier for Allegro’s ACS72981KLRATR-150U3 Hall effect-based, electrically isolated current sensor, which offers a low-resistance (~0.2 mΩ) current path and a high 250 kHz bandwidth for fast response times.
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ACS72981 Current Sensor Compact Carrier (top) and Large Carrier (bottom) size comparison. |
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We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS72981xLR Hall effect-based linear current sensors; we therefore recommend careful reading of the ACS72981 datasheet before using this product. The following list details some of the sensor’s key features:
The connection points are labelled on the bottom silkscreen. The silkscreen also shows the direction that is interpreted as positive current flow via the +i arrow.
The following table lists the available ACS72981 carrier options:
Pololu Item # |
Part Suffix | Supply Voltage (V) |
Current Range | Sensitivity @ Nominal Vcc (mV/A) |
Zero Point @ Nominal Vcc (V) |
Size | Price | ||
---|---|---|---|---|---|---|---|---|---|
Large Carrier |
#5270 | 050B3 | 3.0 to 3.6 (3.3 nominal) |
Bidirectional | ±50 A | 26.4 | 1.65 | 1.4″×1.2″ | $12.95 |
#5273 | 100B3 | ±100 A | 13.2 | ||||||
#5277 | 150B3 | ±150 A | 8.8 | ||||||
#5272 | 050U3 | Unidirectional | 0-50 A | 52.8 | 0.33 | ||||
#5275 | 100U3 | 0-100 A | 26.4 | ||||||
#5279 | 150U3 | 0-150 A | 17.6 | ||||||
#5271 | 050B5 | 4.5 to 5.5 (5 nominal) |
Bidirectional | ±50 A | 40 | 2.5 | |||
#5274 | 100B5 | ±100 A | 20 | ||||||
#5276 | 100U5 | Unidirectional | 0-100 A | 40 | 0.5 | ||||
Compact Carrier |
#5250 | 050B3 | 3.0 to 3.6 (3.3 nominal) |
Bidirectional | ±50 A | 26.4 | 1.65 | 0.7″×0.8″ | $9.95 |
#5253 | 100B3 | ±100 A | 13.2 | ||||||
#5257 | 150B3 | ±150 A | 8.8 | ||||||
#5252 | 050U3 | Unidirectional | 0-50 A | 52.8 | 0.33 | ||||
#5255 | 100U3 | 0-100 A | 26.4 | ||||||
#5259 | 150U3 | 0-150 A | 17.6 | ||||||
#5251 | 050B5 | 4.5 to 5.5 (5 nominal) |
Bidirectional | ±50 A | 40 | 2.5 | |||
#5254 | 100B5 | ±100 A | 20 | ||||||
#5256 | 100U5 | Unidirectional | 0-100 A | 40 | 0.5 |
This large carrier features the ACS72981KLRATR-150U3, which is intended for nominal 3.3 V operation and is designed for unidirectional input current from 0 A to 150 A. This version can be visually distinguished from the other versions by the “3V3 U15” printed on the bottom side, as shown in the left picture above.
Part Suffix | Range | Supply Voltage | Sensitivity @ 3.3 V | Zero Point @ 3.3 V | Size |
---|---|---|---|---|---|
150U3 | 0-150 A (unidirectional) | 3.0 V to 3.6 V | 17.6 mV/A | 0.33 V | 1.4″×1.2″ |
A compact carrier is also available for this sensor IC for more space-constrained applications or to evaluate the IC’s performance with a smaller PCB area for thermal dissipation.
This sensor has five required connections: the input current (IP+ and IP-), logic power (VCC and GND), and the sensor output (VIOUT).
The sensor requires a supply voltage of 3.0 V to 3.6 V to be connected across the VCC and GND pads, which are labelled on the bottom silkscreen. The sensor outputs a ratiometric analogue voltage on VIOUT that has a zero point at VCC/10 and increases by 17.6 mV × (VCC/3.3 V) per amp of input current:
``V_"IOUT" = V_"CC" / 10 + 0.0176 text(V)/text(A) * V_"CC" / (3.3 text(V)) * I_"P" = V_"CC" * (1/10 + I_"P" / (187.5 text(A)))``
``I_"P" = 187.5 text(A) * (V_"IOUT" / V_"CC" – 1/10)``
The VIOUT, VCC, and GND pins work with 0.1″-pitch header pins and are compatible with standard solderless breadboards.
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. Holes with 0.1″, 3.5 mm, and 5 mm spacing are also available for connecting male header pins or terminal blocks, but please note that these smaller connection options are generally not suitable for high currents like those this sensor is intended for.
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.
The dimension diagram is available as a downloadable PDF (402k pdf).
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 | ACS72981Current SensorCompact Carriers | ACS72981Current SensorLarge Carriers | |
Sensor IC | Allegro ACS711KEXT |
Allegro ACS71240 |
Allegro ACS724LLCTR |
Allegro ACS72981xLR | |
---|---|---|---|---|---|
Vcc 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: 3.0–3.6 5V versions: 4.5–5.5 |
|
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 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:(1) ±50 A / 26.4 mV/A ±100 A / 13.2 mV/A ±150 A / 8.8 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 5V Bidirectional:(2) ±50 A / 40 mV/A ±100 A / 20 mV/A 5V Unidirectional:(2) 0–100 A / 40 mv/A |
3.3V Bidirectional:(1) ±50 A / 26.4 mV/A ±100 A / 13.2 mV/A ±150 A / 8.8 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 5V Bidirectional:(2) ±50 A / 40 mV/A ±100 A / 20 mV/A 5V Unidirectional:(2) 0–100 A / 40 mv/A |
IC path resistance | 0.6 mΩ | 0.6 mΩ | 0.6 mΩ | 0.2 mΩ | |
Max bandwidth | 100 kHz | 120 kHz | 120 kHz(3) | 250 kHz | |
Size | 0.7″ × 0.8″ | 0.7″ × 0.8″ | 0.7″ × 0.8″ | 0.7″ × 0.8″ | 1.4″ × 1.2″ |
Overcurrent fault output | |||||
Differential sensing | |||||
Non-ratiometric output | |||||
1-piece price | $3.49 | $3.95 | $6.95 – $7.49 | $9.95 | $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. |
Size: | 1.4″ × 1.2″ |
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Weight: | 4.2 g |
Typical operating voltage: | 3.3 V |
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Current sense: | 17.6 mV/A1 |
Minimum logic voltage: | 3.0 V |
Maximum logic voltage: | 3.6 V |
Supply current: | 14 mA2 |
Version: | 0A to 150A (unidirectional 150A), 3.3V |
Current sensor: | Allegro ACS72981KLRATR-150U3 |
PCB dev codes: | cs04b |
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Other PCB markings: | 0J14823 |
Other PCB markings: | 3V3 U15 |
This DXF drawing shows the locations of all of the board’s holes.
This is the application note referenced on page 16 of the ACS724 datasheet, page 22 of the ACS71240 datasheet, and page 42 of the ACS72981xLR datasheet. The ACS720 is used validate the test methods presented, but these same methods and principles would also apply to the ACS724, ACS71240, and ACS72981.
Allegro product page for the ACS72981, where you can find additional application notes and other resources.