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Allegro MicroSystems ACS37200 Ultra-Compact High-Current Sensors

Allegro MicroSystems ACS37200 Ultra-Compact High-Current Sensors are fully integrated current sensors that sense current flowing through the primary conductor of a compact 8-pin PSOF package. With a very low internal conductor resistance of 50μΩ, the LX package can measure currents up to 200A. Two Hall plates sense the current differentially to provide common-mode field rejection and optimize performance in the presence of external magnetic fields.

Allegro factory-calibrates the ACS37200 for high accuracy across the entire operating temperature range. This automotive-qualified, Grade 0 device operates at temperatures between -40°C and +150°C. These devices are offered in 5V and 3.3V supply voltage variants, with current-sensing ranges from 100A to 200A. The device features an overcurrent fault output with a user-configurable threshold and a dedicated voltage-reference pin that outputs the zero-current analog signal.

Allegro MicroSystems offers the ACS37200 as a lead-free (Pb-free) device with 100% matte tin plating, ensuring compatibility with standard lead-free printed circuit board assembly processes.

Features

  • Low 50μΩ primary conductor resistance for high efficiency and high inrush current capability in a thin surface-mount package with a small footprint suitable for space-constrained automotive applications
  • 150kHz analog output with a fast 4µs response time
  • High accuracy and low noise
    • ±1% sensitivity drift over temperature
    • ±7mV offset drift over temperature
    • 3.3V and 5V non-ratiometric single supply operation
    • Differential sensing for common-mode field rejection
  • Zero-current voltage reference output, VREF, for differential routing in noisy application environments
  • Overcurrent fault output with adjustable threshold
  • UL-certified, isolated, compact surface-mount package
    • 8kVPK impulse withstand voltage
    • 1097VRMS and 1550VDC basic isolation voltage
    • 565VRMS and 800VDC reinforced isolation voltage
  • -40°C to +150°C wide operating temperature
  • AEC-Q100 Grade 0, automotive qualified

Applications

  • Industrial motor control
  • Solar and xEV charging infrastructures
  • xEV onboard chargers
  • xEV DC-DC converters

Additional Resources

Functional Block Diagram

Block Diagram - Allegro MicroSystems ACS37200 Ultra-Compact High-Current Sensors
Published: 2026-05-06 | Updated: 2026-05-11