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Monolithic, Unipolar Hall-effect Switches Designed for Proximity Sensing in Battery-powered Applications

Unipolar Hall-effect Switches
Unipolar Hall-effect Switches

Diodes Incorporated has introduced two new portfolios of monolithic, unipolar Hall-effect switches designed for proximity sensing in battery-powered applications. With an ultra-low 1.1µA supply current at 1.85V, and 1.6µA at 1.6V to 5.5V, these AH138x and AH139x series devices are ideal for battery-powered portable equipment like smartphones, laptops, and wearables. These devices are also suitable for domestic appliances, game consoles, and industrial hardware use. To ensure their suitability in small form-factor applications, all devices are provided in the industry’s smallest packages: DFN1010-4 and DFN1410-4.

The 1.6V to 5.5V operating voltage of these Hall-effect switches allows them to be powered directly from a portable device’s battery, eliminating the area and cost of power conversion. Output 1 in the dual-output AH139x series responds to a North pole, while Output 2 responds to a South pole with typical operating points of 25G (AH1391) and 30G (AH1392). The single output on the AH138x series responds to a South pole on the part-marking side with typical operating points of 18G (AH1381), 30G (AH1382), and 45G (AH1383).

The tight operating window of these switches ensures a lower magnetic spread, while their chopper-stabilized design provides minimal switch point drift and superior temperature stability. For robustness, these devices have strong human body model (HBM) electrostatic discharge (ESD) protection: 8kV for the AH138x and 6kV for the AH139x series. In addition, these devices have push-pull outputs that do not require an external pull-up resistor, simplifying system design, saving board space, and lowering the bill of materials.



  • Two Monolithic Unipolar Hall Switches

  • Supply Voltage of 1.6V to 3.6V

  • Micro Power Operation

  • Dual Outputs for Independent Pole Detection for Design Flexibility

  • Internal Pull-Up and Pull-Down Capability

  • Chopper Stabilized Design

  • Superior Temperature Stability

  • Extremely Low Switch-Point Drift

  • Insensitive to Physical Stress

  • Good RF Noise Immunity

  • Operating Temperature Range: -40°C to +85°C

  • 2kV ESD on Supply and Output Pins



  • Smart Cover or Dock Detect for Cellular Phones and Tablet

  • Position Detect for Digital Still, Video Cameras and Handheld Gaming Consoles

  • Door, Lids and Tray Position Detect Switches Home Appliances and Industrial Applications

  • Level, Proximity and Position Switches

  • Contact-Less Switches in Home Appliances and Industrial Applications


Availability & Pricing

In 1,000 piece quantities, the AH138x series is available in DFN packages at $0.17 and in SOT23 packages at $0.16. The AH139x series is available in DFN packages at $0.18 in 1,000 piece quantities. 

Component Datasheet

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