Diodes Incorporated
SC59

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SOT23

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AH3712A

27V Resistive Pull-Up Hall Effect Latch

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Description

The AH3712 is a high-voltage, high-sensitivity, Hall-effect latch IC designed for commutation of brushless DC motors, flow meters, linear encoders, and position sensors in industrial and consumer home appliances and personal care applications. To support a wide range of demanding applications, the design is optimized to operate over a 3.0V to 27V supply range. With chopper stabilized architecture and an internal bandgap regulator to provide temperature-compensated supply for internal circuits, the AH3712 provides a reliable solution over the whole operating range. The output also has an overcurrent limit.

The single open-drain output can be switched on with a South pole of sufficient strength and switched off with a 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 and latched until magnetic-flux density reverses and becomes lower than the release point (BRP).

Feature(s)

  • Bipolar Latch
    • AH3712/AH3712A: South Pole On, North Pole Off
    • AH3712B: South Pole Off, North Pole On
  • 0V to 27V Operating Voltage Range
  • High Sensitivity: BOP and BRP of ±25G Typical
  • Resistant to physical stress
  • Single Open-Drain (AH3712, AH3712B) or
  • Internal Pull-Up Resistor (AH3712A)
  • Output Polarity:
    • Direct: AH3712, AH3712A
    • Inverted: AH3712B (*Future product)
  • Output with Overcurrent Limit
  • Chopper-Stabilized Design Provides
    • Superior Temperature Stability
    • Minimal Switch-Point Drift
    • Enhanced Immunity to Stress
  • Good RF Noise Immunity
  • -40°C to +125°C Operating Temperature
  • ESD HBM: 8kV, CDM: 1kV
  • Industry-Standard SC59, SOT23 and SIP-3 Packages
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • An automotive-compliant part is available under separate datasheet (AH3712Q)

Application(s)

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

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
AEC Qualified No
Type Latch
Outputs Single
Output Type Pull-Up Resistor
Active Output State (B > Bop) Low
Inactive Output State (B < Brp) High
Key Feature Resistant to Physical Stress
Operating Voltage (V) 3 to 27
Average Supply Current (mA) 2.8
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 10
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 25
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 40
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -40
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -25
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -10
Output Current Capability (mA) 50
Operating Ambient Temperature (°C) -40 to 125

Related Content

Packages

Technical Documents

Recommended Soldering Techniques

TN1.pdf