ACS712ELCTR-30A-T: High-Precision 30A Current Sensor for AC/DC Measurement | Allegro MicroSystems
ACS712ELCTR-30A-T: High-Precision 30A Current Sensor for AC/DC Measurement
The ACS712ELCTR-30A-T from Allegro MicroSystems is a cutting-edge current sensor designed for high-accuracy AC/DC current measurement up to 30A. This Hall Effect-based sensor is widely used in industrial, automotive, and consumer electronics for its reliability and precision. Below, we explore its features, specifications, and applications in detail to help you understand why it's a top choice for engineers worldwide.
Product Overview
The ACS712ELCTR-30A-T is part of Allegro's Hall Effect current sensor family, offering ratiometric output for seamless integration with microcontrollers and ADCs. Its open-loop design ensures low power consumption while maintaining excellent performance across a wide temperature range.
Key Features and Benefits
1. High-Accuracy Current Measurement
- Current Range: 30A (bidirectional)
- Sensitivity: 66mV/A ( 5% tolerance)
- Accuracy: 1.5% at TA = 25 C
- Linearity: 1.5% full scale
The sensor's 66mV/A sensitivity provides excellent resolution for detecting small current variations, while its 1.5% accuracy ensures reliable measurements in critical applications.
2. Wide Frequency Response
- Bandwidth: DC to 80kHz
- Response Time: 5 s typical
With an 80kHz bandwidth, the ACS712ELCTR-30A-T can accurately measure high-frequency current waveforms, making it suitable for switch-mode power supplies and motor drive applications.
3. Robust Design for Harsh Environments
- Operating Temperature: -40 C to +85 C
- Isolation Voltage: 2.1kV RMS
- Low Noise: 21mV RMS at IP = 0A
The sensor's wide temperature range and high isolation voltage make it ideal for automotive and industrial applications where reliability is critical.
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 4.5V to 5.5V |
| Supply Current | 13mA max |
| Output Voltage | 0.5V to 4.5V (ratiometric) |
| Zero Current Output | 2.5V 0.1V |
| Package | 8-pin SOIC (suffix LC) |
Applications
The ACS712ELCTR-30A-T is versatile enough for numerous applications:
- Motor Control: Precise current monitoring in BLDC and stepper motors
- Power Management: Load detection in power supplies and inverters
- Battery Systems: Charge/discharge monitoring in Li-ion battery packs
- Industrial Equipment: Overcurrent protection in machinery
- Automotive: Current sensing in electric vehicle components
Design Considerations
When implementing the ACS712ELCTR-30A-T:
- Ensure proper PCB layout with a continuous ground plane
- Keep sensitive analog traces away from high-current paths
- Use bypass capacitors (0.1 F recommended) near the supply pin
- For best accuracy, calibrate the zero-current output voltage
Comparison with Similar Sensors
Compared to shunt-based solutions, the ACS712 offers:
- Galvanic isolation (no voltage drop)
- Lower power loss (no I R heating)
- Simpler implementation (no need for precision amplifiers)
Conclusion
The ACS712ELCTR-30A-T remains one of the most reliable current sensors for 30A AC/DC measurement, despite being marked 'Not For New Designs.' Its combination of high accuracy, wide bandwidth, and robust construction makes it invaluable for power electronics applications. For engineers needing precise current monitoring without complex circuitry, this sensor delivers exceptional performance in a compact SOIC package.
Note: Allegro may recommend newer alternatives like the ACS723 for future designs, but the ACS712ELCTR-30A-T continues to be a preferred choice for many existing applications.