# ACS72981LLRATR-100U5 Current Sensor Large Carrier 0A to 100A, 5V **Type:** Product page · **SKU:** POLOLU-5276 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/acs72981llratr-100u5-current-sensor-large-carrier-0a-to-100a-5v.html ([markdown](https://core-electronics.com.au/acs72981llratr-100u5-current-sensor-large-carrier-0a-to-100a-5v.html.md)) This is the large version of a simple carrier for Allegro’s ACS72981LLRATR-100U5 Hall effect-based, electrically isolated current sensor, which offers a... ## Pricing - **Price:** $27.90 (inc GST) — $25.36 AUD, exc GST - **Quantity discounts:** 10+ $24.35 (exc GST) · 25+ $23.59 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 20 and Aug 24. ## Description This large carrier features the ACS72981LLRATR-100U5, which is intended for nominal 5 V operation and is designed for unidirectional input current from 0 A to 100 A. This version can be visually distinguished from the other versions by the “5V U10” printed on the bottom side, as shown in the left picture above. | Part Suffix | Range | Supply Voltage | Sensitivity @ 5 V | Zero Point @ 5 V | Size | |---|---|---|---|---|---| | 100U5 | 0-100 A (unidirectional) | 4.5 V to 5.5 V | 40 mV/A | 0.5 V | 1.4"×1.2" | A [**compact carrier**](https://core-electronics.com.au/acs72981llratr-100u5-current-sensor-compact-carrier-0a-to-100a-5v.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 for thermal dissipation. **Using the sensor** | [ ![](https://core-electronics.com.au/attachments/localcontent/0J12587_44658fee1dd.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12587_20129700a31.jpg) | |---| 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 4.5 V to 5.5 V to be connected across the VCC and GND pads, which are labeled on the bottom silkscreen. The sensor outputs a ratiometric analog voltage on VIOUT that has a zero point at VCC/10 and increases by 40 mV × (VCC/5 V) per amp of input current: VIOUT=VCC10+0.04VA⋅VCC5V⋅IP=VCC⋅(110+IP125A)" role="presentation" style="position: relative;">VIOUT=VCC10+0.04VA·VCC5V·IP=VCC·(110+IP125A) IP=125A⋅(VIOUTVCC–110)" role="presentation" style="position: relative;">IP=125A·(VIOUTVCC–110) The VIOUT, VCC, 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). | [ ![](https://core-electronics.com.au/attachments/localcontent/0J12586_61259abe09a.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12586_23695905a51.jpg) | |---| 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](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. **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/0J12524_30954eb6645.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12524_441167dbf8e.png) | |---| | ACS72981 Current Sensor Carrier schematic diagram. | The dimension diagram is available as a **downloadable PDF** (400k pdf). **Real-world power dissipation considerations** | [ ![](https://core-electronics.com.au/attachments/localcontent/0J12694_1104280a938.jpg)](https://core-electronics.com.au/attachments/localcontent/0J12694_1889356905a.jpg) | |---| | Thermal image of a high-current test of a Pololu current sensor carrier (not necessarily this product). | Depending on the version, the ACS72981 can measure up to ±200 A, but its datasheet specifies an absolute maximum continuous current of 120 A. Furthermore, the sensor chip can overheat at lower currents. In Pololu's tests, Pololu found that Pololu's ACS72981 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 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/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) | [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) | | Sensor IC | Allegro ACS711KEXT | Allegro ACS71240 | Allegro ACS724LLCTR | Allegro ACS37220 | Allegro ACS72981xLR | Allegro CT432/CT433 | | Sensing technology | Hall effect | Hall effect | Hall effect | Hall effect | Hall effect | XtremeSense™ TMR (tunneling magnetoresistance) | | 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 | 3.3V versions: 3.0–3.6 5V versions: 4.5–5.5 | 3.3V versions: 3.0–3.6 5V versions: 4.75–5.5 | | Current range / sensitivity | 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:**(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) 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) 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) 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) [±65 A / 30.8 mV/A](https://core-electronics.com.au/pololu-ct432-current-sensor-compact-carrier-65a-5v.html) 5V Unidirectional: [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) 5V Bidirectional: [±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 path resistance | 0.6 mO | 0.6 mO | 0.6 mO | 0.1 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 | 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 | 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" | 0.8" × 1.1" | 1.4" × 1.2" | | Overcurrent fault output | | | | User-configurable threshold | | | | Common-mode field rejection | | | | | | | | Non-ratiometric output | | | | | | | **(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. **Dimensions** | Size: | 1.4" × 1.2" | |---|---| | Weight: | 4.2 g | **General specifications** | Typical operating voltage: | 5 V | |---|---| | Current sense: | 40 mV/A[1](https://core-electronics.com.au/#note1) | | Minimum logic voltage: | 4.5 V | | Maximum logic voltage: | 5.5 V | | Supply current: | 14 mA[2](https://core-electronics.com.au/#note2) | | Current range: | 0A to 100A (unidirectional 100A), 5V | | Current sensor: | Allegro ACS72981LLRATR-100U5 | **Identifying markings** | PCB dev codes: | cs04b | |---|---| | Other PCB markings: | 0J14823 | | Other PCB markings: | 5V U10 | **Notes:** 1 At VCC = 5 V. 2 Typical. **File downloads** - **Dimension diagrams of the ACS72981xLR Current Sensor Carriers (400k pdf)** - **3D model of the ACS72981xLR Current Sensor Large Carriers (3MB step)** - **Drill guide for the ACS72981xLR Current Sensor Large Carriers (19k dxf)** This DXF drawing shows the locations of all of the board’s holes. **Recommended links** - **[ACS72981 datasheet](https://core-electronics.com.au/attachments/localcontent/acs72981-datasheet_398758c5124.pdf)** - **[Allegro Application Note AN296169: Characterizing System Bandwidth in Complex Current Sensor Applications](https://www.allegromicro.com/en/insights-and-innovations/technical-documents/hall-effect-sensor-ic-publications/an-effective-method-for-characterizing-system-bandwidth-an296169)** 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 Hall-based Current Sensor](https://www.allegromicro.com/en/products/sense/current-sensor-ics/fifty-to-two-hundred-amp-integrated-conductor-sensor-ics/acs72981)** Allegro product page for the ACS72981, 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-5276-1.jpg)