Part A
ACS724LLCTR-20AU-T
Allegro microsystèmes
- Lifecycle
- Active
- Stock
- 4933 PCS
- Package
- SOIC-8
- Series
- Capteur de courant
Replacement verdict
Not a drop-in replacement
The ACS722LLCTR-05AB-T and ACS724LLCTR-20AU-T are not functionally interchangeable. They differ in current sensing range, output type, and primary conductor configuration, requiring circuit redesign and validation before any substitution can be considered.
Different current range
Different output type
Different primary conductor
Different sensitivity
Parts at a glance
Part B
ACS722LLCTR-05AB-T
Allegro microsystèmes
- Lifecycle
- Active
- Stock
- 7660 PCS
- Package
- SOIC-N-8
- Series
- Capteur de courant
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ACS722LLCTR-05AB-T | ACS724LLCTR-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 ±5 A full-scale resolution is required, and vice versa. |
| Sensitivity | 264 mV/A | 100 mV/A | Determines the output voltage swing per amp; different sensitivity changes the ADC scaling and measurement resolution in the application circuit. |
| Output Type | Bidirectional (analog) | Unidirectional (analog) | Bidirectional parts measure both positive and negative current, while unidirectional parts only measure one polarity, affecting suitability for AC or reverse-current sensing. |
| Supply Voltage | 3.0 V to 3.6 V | 4.5 V to 5.5 V | The operating supply voltage must match the system rail; a 3.3 V design cannot directly use a 5 V-only sensor without level shifting or a different rail. |
| Isolation Voltage (Working) | 2.1 kVrms | 2.4 kVrms | Higher isolation rating provides greater safety margin between the high-voltage primary conductor and the low-voltage measurement side. |
| Bandwidth | 80 kHz | 120 kHz | Bandwidth limits how fast current transients can be tracked; insufficient bandwidth distorts fast switching or fault current waveforms. |
| Package | SOIC-8 | SOIC-8 | Identical footprint allows drop-in PCB compatibility without layout changes, simplifying substitution. |
| Operating Temperature Range | -40 °C to 150 °C | -40 °C to 150 °C | Matching temperature ratings ensures both parts meet the same thermal environment requirements for industrial and automotive use. |
| Typical Accuracy (Total Error) | ±2.5% | ±1.5% | Tighter accuracy improves measurement fidelity; a less accurate part may not meet system calibration or control-loop requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ACS724LLCTR-20AU-T | ACS722LLCTR-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 | 200mv/A | 264mV/A |
| Frequency | 120kHz | DC ~ 80kHz |
| Linearity | ±1.5% | ±1% |
| Accuracy | ±0.7% | ±3% |
| Voltage - Supply | 4.5V ~ 5.5V | 3V ~ 3.6V |
| Response Time | 4µs | 5µs |
| Current - Supply (Max) | 14mA | 12mA |
| 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 primary differences between the ACS722LLCTR-05AB-T and the ACS724LLCTR-20AU-T?
The ACS722LLCTR-05AB-T is a bidirectional current sensor with a ±5 A sensing range and an analog output, while the ACS724LLCTR-20AU-T is a unidirectional current sensor with a 20 A sensing range and an analog output. They differ in current directionality, sensing range, and sensitivity.
Are the ACS722LLCTR-05AB-T and ACS724LLCTR-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 the output polarity and directionality differ between the bidirectional ACS722 and the unidirectional ACS724.
What is the supply voltage range for the ACS722LLCTR-05AB-T and ACS724LLCTR-20AU-T?
Both the ACS722LLCTR-05AB-T and ACS724LLCTR-20AU-T operate from a single 3.3 V supply, with the ACS722 specified for 3.0 V to 3.6 V and the ACS724 specified for 3.0 V to 3.6 V, according to their respective datasheets.
Can the ACS722LLCTR-05AB-T measure AC and DC currents?
Yes. The ACS722LLCTR-05AB-T is a bidirectional sensor, so it can measure both AC and DC currents within its ±5 A range, with the output voltage centered at half the supply voltage for zero current.
Can the ACS724LLCTR-20AU-T measure negative currents?
No. The ACS724LLCTR-20AU-T is a unidirectional sensor designed for current flow in one direction only, with an output that swings from near 0 V to the supply rail over its 20 A range; it is not intended for negative current measurement.
What is the sensitivity of the ACS722LLCTR-05AB-T and the ACS724LLCTR-20AU-T?
The ACS722LLCTR-05AB-T has a nominal sensitivity of 264 mV/A, while the ACS724LLCTR-20AU-T has a nominal sensitivity of 200 mV/A, as specified in their respective datasheets.
Are the ACS722LLCTR-05AB-T and ACS724LLCTR-20AU-T galvanically isolated?
Yes. Both devices provide galvanic isolation between the current-carrying primary path and the low-voltage signal side, with the ACS722 rated for 2.4 kV RMS isolation and the ACS724 rated for 2.4 kV RMS isolation, per their datasheets.
Which part is better for battery monitoring in a unidirectional charging circuit?
The ACS724LLCTR-20AU-T is generally more suitable for unidirectional charging current monitoring because its 20 A range and unidirectional output are optimized for that use case, whereas the ACS722LLCTR-05AB-T is limited to ±5 A and is bidirectional.