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Micropower Omnipolar Hall Effect Switch

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The AH1897 is a high sensitivity micropower Omnipolar Hall effect switch IC with internal pull up and pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs, the average supply current is only 4.3uA at 1.85V. To support portable equipment the AH1897 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space the AH1897 is available in small low profile packages. The single output is activated with either a north or south pole of sufficient magnetic field strength. When the magnetic flux density (B) perpendicular to the package is larger than operate point (Bop), the output will be turned on (pul°C low) and held until B is lower than release point (Brp). The output will remain off when there is no magnetic field. The AH1897 is available in a small low profile X1-DFN1216-4 package.


  • Cover or Display Switch in Low Profile Portable PCs (eg Ultrabooks)
  • Open and Close Detect for Flip/Slide Cellular Phones
  • Holster or Cover Detect for Cellular Phones and Tablet PCs
  • Digital Still, Video Cameras and Handheld Gaming Consoles
  • Contactless switch

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
# Outputs 1
Output Type Push-Pull
ActiveHigh orLow Low
Sensitivity High
Operating Voltage (V) 1.6 to 3.6 V
Average Supply Current (µA) 4.3 µA
Min OperatingPoint ±Bop (Guass) 14
Typ OperatingPoint ±Bop(Guass) 30
Max OperatingPoint ±Bop(Guass) 40
Min ReleasePoint ±Brp(Guass) 10
Typ ReleasePoint ±Brp(Guass) 20
Max ReleasePoint ±Brp(Guass) 35
Operating Ambient Temperature Range (°C) -40 to 85 °C

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Technical Documents

Recommended Soldering Techniques



Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Digi-Key Electronics 543 11/29/2022 Europe, Asia, North America Buy Now
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Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Farnell, An Avnet Company 3000 11/30/2022 England Buy Now
RS Components - Spain 3000 11/30/2022 Spain Contact Sales
RS Components - UK 3000 11/30/2022 England Buy Now
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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