Diodes Incorporated

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Micropower Omnipolar Hall Effect Switch

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The AH9247 is a high sensitivity Hall-effect switch with internal pullup resistor on the output, designed for battery-operation, handheld equipment.

A chopper stabilized amplifier improves stability of magnetic switch points. A sleep-awake logic controls the IC in sleep time or awake time. This function will reduce the average operating current of the IC. During the awake time, the output is changed with the magnetic flux density. During the sleep time, the output is latched in its previous state and the current consumption will reduce to some µA.

The output can be switched on with either north or south pole of sufficient strength. If the magnetic flux density perpendicular to the part marking surface is larger than operating point (BOP), the output will be turned on; if it is less than releasing point (BRP), the output will be turned off.

The AH9247 is available in TO92S (TYPE B), SC59 and DFN-2X2-3 packages which are optimized for most applications.


  • Micropower Operation
  • 5V to 5.5V Power Supply
  • Switching for Both Poles of a Magnet (Omnipolar)
  • Stabilized Chopper
  • Superior Temperature Stability
  • Digital Output Signal
  • Built-in Pullup Resistor
  • ESD (HBM): 6000V
  • Small Low Profile DFN-2X2-3, Industry-Standard SC59 and TO92S (TYPE B) 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/


  • Cover switches in notebook PC/PDA
  • Handheld wireless application awake switches
  • Magnet switches in low duty-cycle applications

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
AEC Qualified No
Type Omnipolar
Outputs Single
Output Type Pull-Up Resistor
Active Output State (B > Bop) Low
Inactive Output State (B < Brp) High
Operating Voltage (V) 2.5 to 5.5
Average Supply Current (mA) 0.008
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 20
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 30
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 40
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 5
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 20
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 32
Operating Ambient Temperature (°C) -40 to 85

Technical Documents

Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site