Diodes Incorporated

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

SIP 3 3D image

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.


Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

Back to Hall Effect Latches and Switches


High-Voltage Automotive Hall-Effect Latch

Contact Sales

Log in or register to manage email notifications about changes to datasheets or PCNs for this part.


The AH372XQ is an AEC-Q100 qualified high-voltage, high-sensitivity Hall-effect latch IC designed for brushless DC-motor commutation speed measurement, angular or linear encoders and position sensors in automotive applications. To support a wide range of the demanding applications, the design is optimized to operate over the supply range of 3.0V to 28V. With chopper stabilized architecture and an internal bandgap regulator to provide temperature compensated supply for internal circuits, the AH372XQ provides a reliable solution over the whole operating range. For robustness and protection, the device has a reverse blocking diode with a Zener clamp on the supply. The output has an overcurrent limit and a Zener clamp.

The single open-drain output can be switched on with South pole of sufficient strength and switched off with North pole of sufficient strength. When the magnetic flux density (B) perpendicular to the package is larger than the operate point (BOP) the output is switched on (pulled low). The output is held latched until magnetic flux density reverses and becomes lower than the release point (BRP).

The magnetic operating and release polarity is opposite for SOT23 (Type S) and SC59 packages. SOT23 (Type S), SIP-3 (Ammo Pack), and SIP-3 (Bulk Pack) packages will require south pole to the part marking side to operate while SC59 will require south pole to the non-part marking side.


  • Bipolar Latch (South Pole: On, North Pole: Off)
  • 0V to 28V Operating Voltage Range
  • High Sensitivity: BOP and BRP of 25G to 220G and -25G to -220G (typ)
  • Single Open-Drain Output with Overcurrent Limit
  • Chopper Stabilized Design Provides
    • Superior Temperature Stability
    • Minimal Switch Point Drift
    • Enhanced Immunity to Stress
  • Good RF Noise Immunity
  • Reverse Blocking Diode and Zener Clamp on Supply
  • -40°C to +150°C Operating Temperature
  • High ESD HBM: 8kV, CDM: 1kV
  • AEC-Q100 Grade 0 Qualified for High Reliability
  • Industry Standard SC59, SOT23 (Type S), SIP-3 (Ammo Pack)
  • and SIP-3 (Bulk Pack) Packages
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AH372XQ is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • Brushless DC motor commutation
  • Revolution per minute (RPM) measurement
  • Flow meters
  • Angular and linear encoders and position sensing/indexing
  • Flow meters
  • Contactless commutation, speed measurement and angular position sensing/indexing in automotive applications

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Automotive
AEC Qualified Yes
Type Latch
Outputs Single
Output Type Open Drain
Active Output State (B > Bop) Low
Inactive Output State (B < Brp) High-Z
Key Feature Resistant to Physical Stress
Operating Voltage (V) 3 to 28
Average Supply Current (mA) 3
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 15
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 30
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 45
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -45
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -30
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -15
Output Current Capability (mA) 30
Operating Ambient Temperature (°C) -40 to 150

Technical Documents

Recommended Soldering Techniques