AH3722A

Description

The AH3722A/AH3724A is a high-voltage, high-sensitivity Hall-effect latch IC with internal pullup resistor designed for commutation of brushless DC motors, flow meters, linear encoders and position sensors in industrial, consumer home appliances and personal care 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 AH3722A/AH3724A provides a reliable solution over the whole operating range. For robustness and protection, the device has a Zener clamp on the supply. The output has an overcurrent limit and a Zener clamp.

The internally pulled-up 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 part marking surface is larger than the operate point (B_OP) the output is switched on (pulled low). The output is held latched until the magnetic flux density reverses and becomes lower than the release point (B_RP).

Feature(s)

• Bipolar Latch (South Pole: On, North Pole: Off)
• 0V to 28V Operating Voltage Range
• High Sensitivity: B_OP and B_RP of 25G to 40G and -25G to -40G Typical
• Internally Pullup Resistor on the Output Pin
• Resistant to Physical Stress
• Output 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 +125°C Operating Temperature
• High ESD HBM: 8kV
• 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)
• For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/

Application(s)

• Brushless DC motor commutation
• Revolution per minute (RPM) measurement
• Flow meters
• Angular and linear encoders and position sensors
• Contactless commutation, speed measurement and angular position sensing/indexing in consumer home appliances, office equipment and industrial applications