7Semi ACS772 50A 200KHz Current Sensor, Automotive Grade

🔹 Overview
The 7Semi ACS772 Current Sensor is a high-precision Hall-effect based linear current sensor designed for high-current measurement up to ±50A.
Based on Allegro MicroSystems ACS772 IC
Provides analog voltage output proportional to current
Designed for automotive and industrial applications
👉 Suitable for high-power systems requiring fast and accurate current sensing
🔹 Working Principle
Current flows through an integrated low-resistance conductor
Generates a magnetic field
Internal Hall-effect sensor detects magnetic field
Signal conditioning circuit outputs linear analog voltage
👉 Output voltage ∝ input current (AC or DC)
🔹 Measurement Characteristics
Current Range: ±50A (bidirectional)
Peak Current Capability: up to ~±400A (short duration)
Sensitivity: ~40 mV/A
Linearity: ~±0.9%
Total Accuracy: ~±2.1% over lifetime
🔹 Electrical Characteristics
Supply Voltage: 5V
Supply Current: up to ~15 mA
Internal Conductor Resistance: ~100 µΩ
👉 Very low resistance → minimal power loss
🔹 Output Characteristics
Type: Analog (ratiometric voltage output)
Zero Current Output: ~Vcc/2 (~2.5V at 5V supply)
Bandwidth: 200 kHz
Response Time: ~2.5 µs
👉 Suitable for high-speed current monitoring and PWM signals
🔹 Isolation & Safety
Galvanic Isolation: Yes
Dielectric Strength: up to ~4800 Vrms
👉 Enables safe high-side current sensing
🔹 Performance Characteristics
High bandwidth (200 kHz) → fast-changing signals
Low noise design with integrated shielding
Digitally compensated gain & offset
Wide temperature operation: –40°C to +150°C
🔹 Automotive Grade Features
AEC-Q100 Grade 1 qualified
Designed for:
High reliability
Harsh environments
Automotive electronics
🔹 Internal Architecture
Hall-effect sensing element
Precision amplifier
Temperature compensation circuit
Integrated current conductor
Digital calibration system
🔹 Functional Behavior
Measures:
AC current
DC current
PWM current
Outputs:
Linear analog voltage centered at mid-supply
🔹 Key Technical Features
±50A bidirectional current sensing
200 kHz bandwidth
Fast 2.5 µs response
5V operation
Low conductor resistance (100 µΩ)
High isolation capability
Automotive-grade reliability
Analog linear output
🔹 Advantages
High accuracy for high-current measurement
Electrically isolated sensing
Suitable for high-speed signals
Low power loss
Robust industrial/automotive performance
🔹 Limitations
Analog output → requires ADC
Fixed sensitivity (less flexible than digital sensors)
Slight offset drift possible with temperature
Larger size compared to low-current ICs
🔹 Applications
Electric vehicles (EV systems)
Motor control and drives
Inverters & DC-DC converters
Power supplies
Battery management systems (BMS)
Overcurrent protection systems
🔹 Technical Summary
The ACS772 50A sensor is a high-performance Hall-effect current sensor that:
Provides fast, isolated, and accurate current measurement
Handles high current (±50A) with minimal loss
Is optimized for automotive, industrial, and power electronics systems
👉 Best suited for:
High-current + high-speed applications
Systems requiring isolation and reliability