Diodes Incorporated AH1912-FA-7

Overview

AH1912-FA-7 from Diodes Incorporated is an ultra-low power digital omnipolar Hall-effect switch IC in X1-DFN1216-4 package, operating from 1.6V to 5.5V supply, consuming only 1.6μA average current at 3V, with ±30G typical operate point and 7G hysteresis-designed for battery-powered gas/water meters, smoke detectors, and IoT end-nodes requiring reliable magnetic sensing without polarity constraints.

For engineers reviewing the AH1912-FA-7 datasheet, AH1912-FA-7 pinout, AH1912-FA-7 application, or AH1912-FA-7 equivalent, this page delivers verified electrical specs, dual-package pin mapping, real-world use cases in utility metering and smart covers, and validated alternative options with documented magnetic and power trade-offs.

Technical Context

The AH1912 employs a chopper-stabilized architecture that actively cancels offset drift, delivering ±3G max BOP variation over −40°C to +85°C and <0.1% duty cycle in sleep mode. Its hibernating clocking system cycles between 30–80ms periods, enabling microamp-level average current draw while maintaining full magnetic sensitivity.

It features true omnipolar operation: either north or south pole activates the open-drain output (VOL = 0.2V @ 0.1mA), with no external pull-up required. The device achieves 6kV HBM ESD robustness and operates reliably across 1.6V–5.5V-supporting direct interface with 1.8V/3.3V/5V MCUs without level-shifting.

Key Specifications

Pinout & Package

Package: X1-DFN1216-4 (1.2 × 1.6 mm, 0.5 mm height, exposed pad unconnected). Pinout optimized for compact placement in space-constrained IoT sensors and meter modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect switch applications.

Compared with A3212LLHLT-T and US5881LUA-ABA-000-RE, the AH1912-FA-7 uniquely balances ultra-low power, omnipolarity, and sub-2mm DFN footprint-making it optimal for sealed, battery-critical IoT endpoints where magnet orientation cannot be controlled during manufacturing.

Availability

AH1912-FA-7 is available at Aetrix Electronics and suitable for gas/water metering, smart cover detection, and smoke detector interlocks requiring stable component supply across multi-year production cycles and global regulatory certifications.

Supply support for AH1912-FA-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the U.S., serving industrial, computing, and consumer markets.

The AH1912 belongs to Diodes' Hall-effect switch portfolio-engineered specifically for ultra-low-power, polarity-agnostic magnetic sensing in battery-operated infrastructure and safety-critical edge devices.

FAQ

What is the maximum recommended operating voltage for continuous use?

The AH1912-FA-7 is rated for continuous operation from 1.6V to 5.5V. While its absolute maximum VDD is 6V, this is a transient stress rating only-not intended for sustained use. Operating above 5.5V risks accelerated parametric shift and reduced long-term reliability in utility meter applications.

Can the NC pin (Pin 3) be used as a thermal pad or grounded for heat dissipation?

No. Pin 3 is internally unconnected and not bonded to the die or thermal slug. It has no electrical or thermal function. Grounding it provides no thermal benefit and may introduce unintended coupling paths; the exposed center pad is also unconnected and should remain floating per datasheet Note 5.

How does the hibernating clock affect response latency in wake-up events?

The device wakes every 30–80ms (typical 45ms) to sample magnetic field. Upon detection, output transitions within 30–80μs (tAWAKE). This means worst-case latency from field application to valid output is ~80.08ms-fully adequate for cover detection or tamper alerts but unsuitable for real-time motor commutation.

Is the X1-DFN1216-4 package RoHS and halogen-free compliant?

Yes. AH1912-FA-7 meets EU RoHS 2015/863/EU (RoHS 3), contains <900ppm bromine, <900ppm chlorine (<1500ppm total Br+Cl), and <1000ppm antimony-certified "Green" per Diodes' definition and fully lead-free per JEDEC J-STD-609.