Allegro MicroSystems ACS37035 AEC-Q100 1MHz Hall-Effect Current Sensor

The Allegro MicroSystems ACS37035 AEC-Q100 1MHz Hall-Effect Current Sensor is an isolated current sensor designed for high-frequency current measurement in power conversion and automotive applications. It integrates Hall-effect sensing elements, differential magnetic field detection, and signal processing within a compact SOIC-16 wide-body package. The sensor provides a 1MHz bandwidth and sub-microsecond response time, supporting fast control loops in switch-mode power systems. Differential sensing using dual Hall plates suppresses common-mode magnetic field interference, improving measurement stability in electrically noisy environments. 

The conductive primary path features a typical resistance below 1mΩ, minimizing conduction losses during operation. The ACS37035 is AEC-Q100 Grade 1 qualified and supports operating temperatures from -40°C to +125°C. Isolation ratings include 4242VRMS withstand voltage, 1000VRMS basic isolation, and 500VRMS reinforced isolation. Additional features include adjustable overcurrent fault detection, non-ratiometric output, and low offset voltage for current sensing in automotive and industrial power electronics. 

Features of ACS37035 AEC-Q100 1MHz Hall-Effect Current Sensor

The ACS37035 integrates Hall-effect sensing and signal conditioning for isolated current measurement. It supports high-bandwidth current sensing, differential magnetic field detection, and automotive-qualified operation. Let’s go through its features in detail:

High-Bandwidth Current Measurement

The ACS37035 provides a bandwidth of up to 1MHz with a typical response time of 0.45µs, enabling current monitoring in high-frequency switching converters and fast control loops. These characteristics support applications requiring rapid current feedback, transient detection, and high-speed power regulation.

Differential Hall-Effect Sensing

The sensor incorporates two Hall plates operating in a differential configuration to suppress common-mode magnetic field interference. This sensing method improves measurement accuracy in electrically noisy environments while eliminating magnetic hysteresis. Integrated signal processing provides a non-ratiometric output with low offset voltage and stable sensitivity over temperature.

Low-Loss Conduction and Protection Features

The primary conductor resistance below 1mΩ minimizes power dissipation during current measurement. The device includes an adjustable fast overcurrent fault function for protection against excessive current conditions. Low conduction losses and integrated fault detection support efficient operation in power conversion systems and motor drive applications. 

Isolation and Automotive Qualification

The ACS37035 is housed in a compact SOIC-16 wide-body package providing 4242VRMS withstand voltage, 1000VRMS basic isolation, and 500VRMS reinforced isolation. It is qualified to AEC-Q100 Grade 1 and certified to UL 62368, supporting deployment in automotive and industrial electronic systems operating from -40°C to +125°C. 

Compact Integration for Power Electronics

The device combines the sensing element, isolation structure, and signal conditioning circuitry into a single package, reducing external component count and PCB area. This integrated architecture simplifies implementation in switch-mode power supplies, onboard chargers, DC-DC converters, and other compact power management systems. 

Applications

The ACS37035 Hall-effect current sensor is used in motor control systems for current monitoring and closed-loop control. In switch-mode power supplies, it provides isolated high-bandwidth current feedback for fast regulation and protection. Automotive applications include xEV onboard chargers and DC-DC converters requiring precise current measurement and electrical isolation. The sensor is also suitable for load detection and power management systems where low conductor resistance and rapid response improve efficiency. Additional applications include server power supplies, industrial power converters, battery management systems, renewable energy converters, and high-frequency switching circuits requiring isolated current sensing with automotive-grade reliability.