Part A
ACS722LLCTR-05AB-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 7660 PCS
- Package
- SOIC-N-8
- Series
- Current Sensors
Replacement verdict
Not a drop-in replacement
The ACS723LLCTR-40AU-T and ACS722LLCTR-05AB-T are not functionally interchangeable. They differ in current sensing range, output interface type, and package construction, requiring circuit redesign and layout changes before substitution can be considered.
Different current range
Different output type
Different package
Different isolation rating
Parts at a glance
Part B
ACS723LLCTR-40AU-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 1625 PCS
- Package
- SOIC-8
- Series
- Current Sensors
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-40AU-T | ACS722LLCTR-05AB-T | Why it matters |
|---|---|---|---|
| Current Sensing Range | ±40 A | ±5 A | Defines the maximum measurable current; a 40 A sensor cannot be substituted where only 5 A full-scale resolution is needed, and vice versa. |
| Sensitivity | 50 mV/A | 264 mV/A | Determines output voltage per amp of sensed current; different sensitivity changes the ADC scaling and measurement resolution in the application. |
| 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 dropped into the same board without a level-shifting or regulator change. |
| Output Type | Analog voltage, ratiometric | Analog voltage, ratiometric | Both provide ratiometric analog output, but the different supply voltages make the output swing and zero-current offset incompatible. |
| Isolation Voltage | 2.1 kVrms (basic isolation) | 2.1 kVrms (basic isolation) | Both offer the same galvanic isolation rating, so safety isolation requirements are met equally by either device. |
| Bandwidth | 80 kHz | 80 kHz | Identical bandwidth means both can track similar transient current events, so dynamic response is not a differentiator. |
| Package | 8-lead SOIC | 8-lead SOIC | Same footprint allows direct PCB replacement without layout changes, simplifying substitution. |
| Operating Temperature Range | -40 °C to 150 °C | -40 °C to 150 °C | Equivalent temperature ratings mean both are suitable for the same industrial and automotive thermal environments. |
| Accuracy | ±2% typical (at 25 °C) | ±2% typical (at 25 °C) | Similar accuracy means measurement error budgets are comparable, though sensitivity differences still affect absolute resolution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ACS722LLCTR-05AB-T | ACS723LLCTR-40AU-T |
|---|---|---|
| Part Status | Active | Active |
| For Measuring | AC/DC | DC |
| Sensor Type | Hall Effect, Open Loop | Hall Effect, Open Loop |
| Current - Sensing | 5A | 40A |
| Number of Channels | 1 | 1 |
| Output | Ratiometric, Voltage | Ratiometric, Voltage |
| Sensitivity | 264mV/A | 100mV/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 | Bidirectional | Unidirectional |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the ACS723LLCTR-40AU-T and ACS722LLCTR-05AB-T current sensors?
The ACS723LLCTR-40AU-T is a 40 A unidirectional current sensor with a 400 mV/A sensitivity, while the ACS722LLCTR-05AB-T is a 5 A bidirectional current sensor with a 264 mV/A sensitivity. Both are galvanically isolated Hall-effect sensors from Allegro MicroSystems, but they differ in current range, directionality, sensitivity, and package thermal performance.
Are the ACS723LLCTR-40AU-T and ACS722LLCTR-05AB-T pin-to-pin compatible?
No. The ACS723LLCTR-40AU-T is supplied in an SOIC-8 package, while the ACS722LLCTR-05AB-T is supplied in an SOIC-8 package with a different pinout and exposed thermal pad configuration. They are not direct drop-in replacements and require separate PCB land patterns.
What is the measurement range of each sensor?
The ACS723LLCTR-40AU-T measures up to 40 A in one direction (unidirectional). The ACS722LLCTR-05AB-T measures ±5 A (bidirectional), making it suitable for applications where current flows in both directions.
Which sensor offers higher sensitivity?
The ACS723LLCTR-40AU-T offers a typical sensitivity of 400 mV/A, while the ACS722LLCTR-05AB-T offers a typical sensitivity of 264 mV/A. The higher sensitivity of the ACS723LLCTR-40AU-T provides greater output voltage swing per ampere, but at the cost of a narrower measurable current range.
What are the supply voltage requirements for these devices?
Both the ACS723LLCTR-40AU-T and ACS722LLCTR-05AB-T operate from a single 3.3 V or 5 V supply. The ACS723LLCTR-40AU-T is specified for a 5 V supply, while the ACS722LLCTR-05AB-T is specified for a 3.3 V supply. Always verify the exact supply voltage range in the respective datasheet before design.
What isolation voltage do these sensors provide?
Both devices provide basic galvanic isolation. The ACS723LLCTR-40AU-T is rated for 2.1 kVRMS isolation, and the ACS722LLCTR-05AB-T is rated for 2.4 kVRMS isolation. These ratings are for basic isolation and are verified per UL 60950-1 and CSA standards.
Can the ACS722LLCTR-05AB-T be used to replace the ACS723LLCTR-40AU-T in a 40 A application?
No. The ACS722LLCTR-05AB-T has a maximum measurable current of ±5 A, so it cannot handle a 40 A load. Attempting to use it in a 40 A application would exceed its measurement range and may damage the device. The ACS723LLCTR-40AU-T is the appropriate choice for higher-current unidirectional sensing.
What are the typical applications for each sensor?
The ACS723LLCTR-40AU-T is typically used in motor control, load detection, and power supply monitoring where currents up to 40 A are present. The ACS722LLCTR-05AB-T is used in battery management, low-power motor control, and bidirectional current sensing applications up to ±5 A.