Description
The ACS758LCB-050B Current Sensor Module is built around the Allegro ACS758LCB-050B Hall-effect linear current sensor IC, providing isolated, bidirectional AC/DC current measurement up to ±50A. Unlike shunt-based solutions, the ACS758 uses Hall-effect sensing with an integrated magnetic core to concentrate flux, offering galvanic isolation between the current path and the sensor electronics while maintaining minimal insertion loss (internal conductor resistance of only 100 µΩ) . The module outputs a ratiometric analog voltage centered at VCC/2 (typically 2.5V at 5V supply) when no current flows, with a sensitivity of 40 mV/A . The board includes large screw terminals or through-hole pads for the high-current path and a header for VCC, GND, and analog output, making it directly compatible with Arduino, ESP32, and other microcontroller platforms. It is suitable for individual makers building high-power monitors or motor control projects, as well as business purchasers seeking a robust, isolated current sensing solution for inverters, battery management systems, and industrial equipment diagnostics.
Features
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Bidirectional AC/DC Measurement: Measures current in both directions across a ±50A range, suitable for AC and DC applications .
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High Isolation Voltage: Provides galvanic isolation up to 4800 Vrms between the current path and sensor electronics, protecting low-voltage controllers .
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Low Insertion Loss: Internal conductor resistance of only 100 µΩ minimizes voltage drop and power dissipation in the measured circuit .
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Ratiometric Analog Output: Outputs a linear analog signal (40 mV/A) centered at VCC/2, readable by any microcontroller with an ADC .
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Wide Supply Voltage Range: Operates from 3.0V to 5.5V, compatible with both 3.3V and 5V logic systems .
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Factory-Calibrated with Stable Offset: Trimmed for accuracy during manufacturing, with extremely stable output offset voltage and near-zero magnetic hysteresis .
Technical Specifications
| Parameter | Specification |
|---|---|
| Sensor IC | ACS758LCB-050B-PFF-T |
| Supply Voltage | 3.0V to 5.5V DC |
| Measurement Range | ±50A (bidirectional) |
| Sensitivity | 40 mV/A (typical) |
| Quiescent Output | VCC/2 (2.5V at 5V supply, 0A) |
| Isolation Voltage | 4800 Vrms (minimum) |
| Internal Conductor Resistance | 100 µΩ (typical) |
| Bandwidth | 120 kHz |
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