Part A
ACS724LLCTR-50AB-T
Allegro microsystèmes
- Lifecycle
- Active
- Stock
- 3779 PCS
- Package
- SOIC-8
- Series
- Capteur de courant
Replacement verdict
Compatible functional replacement candidate
The ACS724LLCTR-50AB-T is not a direct drop-in replacement for the ACS722LLCTR-05AB-T. While both are galvanically isolated Hall-effect current sensor ICs in the same SOIC-8 package and share a bidirectional analog output architecture, they differ fundamentally in primary sensed current range (5 A vs 50 A), sensitivity, and coupling topology. The ACS724 offers a wider measurement span and lower sensitivity, making it suitable only where the host design can accommodate the reduced resolution at low currents and the different transfer function. Validation of the full signal chain, including ADC scaling, overcurrent thresholds, and thermal behavior, is required before substitution.
Current Sensing Range
Validation required
Sensitivity
Validation required
Output Type
High match
Package Type
High match
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-50AB-T | Why it matters |
|---|---|---|---|
| Current Sensing Range | ±5 A | ±50 A | Defines the maximum measurable current; a 10x difference means the two parts are not directly interchangeable for a given load current. |
| Sensitivity | 264 mV/A | 40 mV/A | Determines output voltage per amp of sensed current and directly affects the ADC resolution and signal scaling in the application circuit. |
| Supply Voltage (Vcc) | 3.0 V to 3.6 V | 4.5 V to 5.5 V | The two devices operate on different logic supply rails, so they cannot be dropped into the same board without changing the power supply. |
| Output Type | Analog ratiometric | Analog ratiometric | Both provide a ratiometric analog output, but the different Vcc and sensitivity mean the output swing and scaling differ significantly. |
| Isolation Voltage | 2.4 kVrms | 2.4 kVrms | Galvanic isolation rating is identical, so both meet the same safety isolation requirement for high-side sensing. |
| Bandwidth | 80 kHz | 120 kHz | Higher bandwidth in the ACS724 allows faster current transient tracking, which matters for motor control and switching applications. |
| Package | SOIC-8 | SOIC-8 | Identical footprint and pinout allow PCB-level interchangeability, though electrical differences still require design changes. |
| Operating Temperature Range | -40 °C to 150 °C | -40 °C to 150 °C | Same temperature rating means both are suitable for the same industrial and automotive thermal environments. |
| Typical Accuracy | ±1.5% typical | ±1.5% typical | Similar accuracy class means measurement precision is comparable, but the full-scale range difference dominates system error budget. |
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 | ACS724LLCTR-50AB-T | ACS722LLCTR-05AB-T |
|---|---|---|
| Part Status | Active | Active |
| For Measuring | AC/DC | AC/DC |
| Sensor Type | Hall Effect, Open Loop | Hall Effect, Open Loop |
| Current - Sensing | 50A | 5A |
| Number of Channels | 1 | 1 |
| Output | Ratiometric, Voltage | Ratiometric, Voltage |
| Sensitivity | 40mV/A | 264mV/A |
| Frequency | DC ~ 120kHz | DC ~ 80kHz |
| Linearity | ±1.5% | ±1% |
| Accuracy | ±0.8% | ±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 | Bidirectional | Bidirectional |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the ACS722LLCTR-05AB-T and ACS724LLCTR-50AB-T current sensors?
The ACS722LLCTR-05AB-T is a 5 A bidirectional Hall-effect current sensor, while the ACS724LLCTR-50AB-T is a 50 A bidirectional Hall-effect current sensor. Both are galvanically isolated and provide an analog output proportional to the sensed current, but they differ in primary sensed current range, sensitivity, and package thermal performance.
Are the ACS722LLCTR-05AB-T and ACS724LLCTR-50AB-T pin-to-pin compatible?
Yes. Both devices are offered in the same SOIC-8 package with the same pinout and footprint. However, pin-to-pin compatibility does not guarantee functional interchangeability because the current ranges, sensitivity, and output voltage scaling differ.
What is the sensitivity of each device?
The ACS722LLCTR-05AB-T has a typical sensitivity of 264 mV/A. The ACS724LLCTR-50AB-T has a typical sensitivity of 40 mV/A. These values are specified for a 5 V supply and are subject to the tolerances stated in the respective Allegro MicroSystems datasheets.
Can the ACS722LLCTR-05AB-T and ACS724LLCTR-50AB-T operate from the same supply voltage?
Yes. Both devices are designed for a single 5 V supply and are also available in 3.3 V variants. The specific suffix in the part number determines the supply voltage and output scaling, so the exact ordering code must be verified against the manufacturer datasheet.
Which device is better for measuring low currents with higher resolution?
The ACS722LLCTR-05AB-T is better suited for low-current measurement because its 5 A full-scale range and higher sensitivity of 264 mV/A provide greater output voltage change per ampere, resulting in better resolution for small currents compared to the ACS724LLCTR-50AB-T.
Which device is better for measuring higher currents?
The ACS724LLCTR-50AB-T is better suited for higher-current measurement because its 50 A full-scale range allows it to sense currents well beyond the 5 A limit of the ACS722LLCTR-05AB-T. The lower sensitivity of 40 mV/A is a trade-off for the extended current range.
Do both devices provide galvanic isolation?
Yes. Both the ACS722LLCTR-05AB-T and ACS724LLCTR-50AB-T are galvanically isolated current sensors. The isolation is provided by the integrated Hall-effect sensing element and the package construction, with isolation ratings specified in the respective datasheets.
Can the ACS722LLCTR-05AB-T be replaced by the ACS724LLCTR-50AB-T in an existing design?
Not directly without design changes. Although the package and pinout are the same, the sensitivity, full-scale range, and output voltage swing differ. The system firmware or analog signal conditioning must be recalibrated to interpret the output correctly, and the measurement resolution for low currents will be reduced.
What is the output type of these current sensors?
Both the ACS722LLCTR-05AB-T and ACS724LLCTR-50AB-T provide an analog voltage output that is proportional to the sensed bidirectional current. The quiescent output voltage is typically half the supply voltage, and the output swings above and below this midpoint depending on current direction.