Part A
ACS722LLCTR-20AU-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 6271 PCS
- Package
- SOIC-N-8
- Series
- Sensores atuais
Replacement verdict
Compatible functional replacement candidate
The ACS722LLCTR-20AU-T is not a direct drop-in replacement for the ACS723LLCTR-05AB-T. While both are Allegro current sensor ICs sharing the SOIC-8 package and similar supply requirements, they differ fundamentally in measurement range, output interface, and sensing topology. The ACS723LLCTR-05AB-T provides a bidirectional analog output with a ±5 A sensing range, whereas the ACS722LLCTR-20AU-T offers a unidirectional analog output with a 20 A range. Designers must validate signal conditioning, ADC scaling, and current direction handling before substituting.
Current Sensing Range
Validation required
Output Type
Not compatible
Package Type
High match
Supply Voltage
Validation required
Parts at a glance
Part B
ACS723LLCTR-05AB-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 5274 PCS
- Package
- SOIC-8
- Series
- Sensores atuais
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ACS723LLCTR-05AB-T | ACS722LLCTR-20AU-T | Why it matters |
|---|---|---|---|
| Current Sensing Range | ±5 A | ±20 A | Defines the maximum measurable current; a 20 A sensor cannot be directly substituted where only 5 A full-scale resolution is needed, and vice versa. |
| Sensitivity | 400 mV/A | 66 mV/A | Determines output voltage swing per amp; different sensitivity changes the ADC scaling and resolution of the measurement. |
| Supply Voltage | 4.5 V to 5.5 V | 3.0 V to 3.6 V | Incompatible supply rails mean the two parts cannot be swapped without changing the system power design. |
| Output Type | Analog voltage | Analog voltage | Both provide an analog output, but the different sensitivity and supply levels still prevent direct interchangeability. |
| Isolation Voltage | 2.1 kVrms | 2.1 kVrms | Galvanic isolation rating affects safety and common-mode rejection; identical ratings here support similar high-voltage isolation capability. |
| Bandwidth | 80 kHz | 80 kHz | Bandwidth determines how fast current transients can be tracked; matching values indicate similar dynamic response. |
| Operating Temperature Range | -40 °C to 150 °C | -40 °C to 150 °C | Both parts support the same industrial temperature range, so thermal environment is not a differentiator. |
| Package | 8-SOIC | 8-SOIC | Identical footprint allows PCB-level compatibility, though electrical differences still prevent direct substitution. |
| Accuracy | ±3% typical | ±3% typical | Similar accuracy means measurement error budgets are comparable, but full-scale range and sensitivity differences dominate substitutability. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ACS722LLCTR-20AU-T | ACS723LLCTR-05AB-T |
|---|---|---|
| Part Status | Active | Active |
| For Measuring | DC | AC/DC |
| Sensor Type | Hall Effect, Open Loop | Hall Effect, Open Loop |
| Current - Sensing | 20A | 5A |
| Number of Channels | 1 | 1 |
| Output | Ratiometric, Voltage | Ratiometric, Voltage |
| Sensitivity | 132mV/A | 400mV/A |
| Frequency | DC ~ 80kHz | DC ~ 80kHz |
| Linearity | ±1% | ±1% |
| Accuracy | ±3% | ±3% |
| Voltage - Supply | 3V ~ 3.6V | 5V |
| Response Time | 5µs | 5µs |
| Current - Supply (Max) | 12mA | 14mA |
| Operating Temperature | -40°C ~ 150°C | -40°C ~ 150°C |
| Polarization | Unidirectional | Bidirectional |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ACS723LLCTR-05AB-T and ACS722LLCTR-20AU-T current sensors?
The ACS723LLCTR-05AB-T is a bidirectional 5 A sensor with an analog output, while the ACS722LLCTR-20AU-T is a unidirectional 20 A sensor with an analog output. They differ in primary sensed current range, directionality, sensitivity, and package thermal performance.
Are the ACS723LLCTR-05AB-T and ACS722LLCTR-20AU-T pin-to-pin compatible?
Both devices are offered in the same SOIC-8 package footprint, but pin-to-pin compatibility must be verified against the specific manufacturer datasheets because pin functions and output configurations can differ between the ACS723 and ACS722 families.
What is the primary sensed current range for each device?
The ACS723LLCTR-05AB-T has a primary sensed current range of ±5 A, while the ACS722LLCTR-20AU-T has a primary sensed current range of 0 A to 20 A in the unidirectional measurement direction.
What are the supply voltage requirements for these sensors?
Both the ACS723LLCTR-05AB-T and ACS722LLCTR-20AU-T operate from a single 3.3 V supply, as specified in their respective Allegro MicroSystems datasheets.
How do the sensitivity specifications compare between the ACS723LLCTR-05AB-T and ACS722LLCTR-20AU-T?
The ACS723LLCTR-05AB-T provides a nominal sensitivity of 400 mV/A, while the ACS722LLCTR-20AU-T provides a nominal sensitivity of 66 mV/A. These values are defined at the specified supply voltage and ambient temperature conditions in the manufacturer datasheets.
Can the ACS723LLCTR-05AB-T and ACS722LLCTR-20AU-T be used interchangeably in an existing design?
No. Interchangeability requires matching the primary sensed current range, directionality, sensitivity, output voltage swing, and isolation requirements. The ACS723LLCTR-05AB-T is bidirectional and rated for ±5 A, while the ACS722LLCTR-20AU-T is unidirectional and rated for 20 A, so a direct substitution would change measurement behavior and may exceed the signal conditioning range of the target circuit.
What isolation voltage do these current sensor ICs provide?
Both the ACS723LLCTR-05AB-T and ACS722LLCTR-20AU-T are galvanically isolated current sensor ICs. The specific isolation voltage rating must be confirmed from the official Allegro MicroSystems datasheet for each part number, as ratings can vary by package and test condition.
Which applications are better suited for the ACS723LLCTR-05AB-T versus the ACS722LLCTR-20AU-T?
The ACS723LLCTR-05AB-T is suited for lower-current bidirectional measurement applications such as motor phase current sensing or bidirectional DC monitoring up to ±5 A. The ACS722LLCTR-20AU-T is suited for higher-current unidirectional applications such as DC-DC converter output, battery charging, or load monitoring up to 20 A in one direction.