Diodes Incorporated

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Linear Hall Effect Sensor

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The AH49FQ is a small, versatile linear Hall effect device that is operated by the magnetic field from a permanent magnet or an electromagnet. The output voltage is set by the supply voltage and varies in proportion to the strength of the magnetic field.

The integrated circuitry features low-noise output, which makes it unnecessary to use external filtering components. It also includes precision resistors to provide increased temperature stability and accuracy. The operating temperature range of these linear Hall sensors is -40°C to +105°C, appropriate for automotive, commercial, consumer, and industrial environments.

The AH49FQ is available in SC59 package.


  • Power Consumption of 3.0mA at VCC = 5V for Energy Efficiency
  • Single Current Sourcing Output
  • Linear Voltage Output for Circuit Design Flexibility
  • Low-Noise Output Virtually Eliminates the Need for Filtering
  • A Stable and Accurate Output
  • Temperature Range: -40°C to +105°C
  • Responds to Either Positive or Negative Gauss
  • The Maximum Instantaneous Supply Voltage up to 50V
  • High ESD Rating: 3000V (Human Body Model) 2000V (Charged Device Model)
  • Small Low Profile SC59 Package
  • AEC-Q100 Grade 2 Qualified
  • Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AH49FQ is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • Position sensing
  • Liquid level sensing
  • Weight sensing
  • Ferrous metal detectors
  • Vibration sensing
  • Rotary encoders
  • Magnetic code reading
  • Motor controls
  • Current sensing

Product Specifications

Product Parameters

Compliance (Only Automotive(Q) supports PPAP) Automotive
Output Type Voltage Output
Operating Voltage (V) 3 to 8 V
Average Supply Current (µA) 3
Typical Sensitivity (mV/Gauss) 2.1 mV/Gauss
Output Voltage Span (V) 0.8 to (Vcc-0.8) V
Linearity of Span 0.70%
Null Output Voltage VCC/2
Magnetic Flux Density Range Gauss (Min) ±500
Magnetic Flux Density Range Gauss (Typ) ±800 Typ
Operating Ambient Temperature (°C) -40 to 105 °C

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