Part A
ACS723LLCTR-40AU-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 1625 PCS
- Package
- SOIC-8
- Series
- Current Sensors
Replacement verdict
Not a drop-in replacement
The ACS723LLCTR-05AB-T and ACS723LLCTR-40AU-T are not functionally interchangeable despite sharing the ACS723 family platform. The 05AB variant provides a bidirectional ±5 A sensing range with analog output, while the 40AU variant offers a unidirectional 40 A sensing range with analog output. The primary current conductor, sensitivity, and measurement direction differ fundamentally, making direct substitution impractical without circuit redesign and recalibration.
Different current range
Different measurement direction
Different sensitivity
Different application fit
Parts at a glance
Part B
ACS723LLCTR-05AB-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 5274 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-05AB-T | ACS723LLCTR-40AU-T | Why it matters |
|---|---|---|---|
| Current Sensing Range | ±5 A | ±40 A | Defines the maximum measurable current; a ±5 A sensor cannot directly replace a ±40 A sensor in high-current applications without saturating. |
| Sensitivity | 400 mV/A | 50 mV/A | Determines output voltage per amp of sensed current; different sensitivity requires recalibration of the downstream ADC or control loop. |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate from a 5 V rail, so power supply compatibility is maintained between the two parts. |
| Output Type | Analog voltage, ratiometric | Analog voltage, ratiometric | Both provide a ratiometric analog output, allowing similar signal conditioning circuitry to be used. |
| Isolation Voltage | 2.1 kVrms | 2.1 kVrms | Galvanic isolation rating is identical, so safety and isolation requirements are met by either device. |
| Bandwidth | 80 kHz | 80 kHz | Same bandwidth means both can handle comparable signal frequencies in control and monitoring applications. |
| Operating Temperature Range | -40°C to 150°C | -40°C to 150°C | Identical temperature range ensures both parts are suitable for the same harsh environments. |
| Package | 8-SOIC | 8-SOIC | Same footprint allows drop-in PCB compatibility without layout changes. |
| Accuracy | ±3% typical | ±3% typical | Equivalent accuracy means measurement precision is not compromised when substituting one for the other. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ACS723LLCTR-40AU-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 | 40A | 5A |
| Number of Channels | 1 | 1 |
| Output | Ratiometric, Voltage | Ratiometric, Voltage |
| Sensitivity | 100mV/A | 400mV/A |
| Frequency | DC ~ 80kHz | DC ~ 80kHz |
| Linearity | ±1% | ±1% |
| Accuracy | ±3% | ±3% |
| Voltage - Supply | 5V | 5V |
| Response Time | 5µs | 5µs |
| Current - Supply (Max) | 14mA | 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 the ACS723LLCTR-40AU-T?
The ACS723LLCTR-05AB-T is a bidirectional current sensor with a nominal primary current measurement range of ±5 A, while the ACS723LLCTR-40AU-T is a unidirectional current sensor with a nominal measurement range of 40 A. The 05AB variant provides a quiescent output voltage at VCC/2 and responds to current flow in both directions, whereas the 40AU variant has a quiescent output near 0.5 V and is optimized for unidirectional current sensing.
Are the ACS723LLCTR-05AB-T and ACS723LLCTR-40AU-T pin-compatible?
Yes. Both devices are offered in the same SOIC-8 package with an identical pinout. The primary current path is between pins 1 and 2 (IP+) and pins 3 and 4 (IP-), while pins 5 through 8 provide VCC, GND, VIOUT, and FILTER connections. This allows a common PCB footprint, but the different measurement ranges and directionality must be considered before substitution.
What is the sensitivity of each device?
The ACS723LLCTR-05AB-T has a typical sensitivity of 400 mV/A. The ACS723LLCTR-40AU-T has a typical sensitivity of 50 mV/A. These values are specified for a 5 V supply and are derived from the manufacturer's datasheet.
Can the ACS723LLCTR-05AB-T and ACS723LLCTR-40AU-T operate from the same supply voltage?
Yes. Both devices are specified for a single 5 V supply (VCC = 5 V) and share the same supply voltage range and typical current consumption. However, the output voltage swing and quiescent output level differ due to the different measurement ranges and directionality.
Which device is suitable for measuring bidirectional current?
The ACS723LLCTR-05AB-T is the bidirectional variant and is suitable for measuring current in both positive and negative directions. The ACS723LLCTR-40AU-T is unidirectional and is intended for applications where current flows in only one direction.
What is the isolation voltage rating for these devices?
Both the ACS723LLCTR-05AB-T and ACS723LLCTR-40AU-T are rated for a minimum isolation voltage of 2.1 kVRMS for 1 minute per UL 60950-1 and a continuous working voltage of 184 V peak. These ratings are common to the ACS723 family and are specified in the manufacturer's datasheet.
What are the typical applications for each variant?
The ACS723LLCTR-05AB-T is typically used in low-current bidirectional sensing applications such as motor control, power monitoring, and battery management where current can flow in both directions. The ACS723LLCTR-40AU-T is used in higher-current unidirectional applications such as DC-DC converters, power supplies, and load detection where current flows in a single direction.
Do both devices have the same operating temperature range?
Yes. Both the ACS723LLCTR-05AB-T and ACS723LLCTR-40AU-T are specified for an operating ambient temperature range of -40 °C to 125 °C, as stated in the manufacturer's datasheet.