Diodes Incorporated AH1893-FA-7

Overview

AH1893-FA-7 from Diodes Incorporated is a high-sensitivity, micropower omnipolar Hall-effect switch IC in X1-DFN1216-4 package, operating from 1.6V to 3.6V with 4.3µA average supply current at 1.85V and magnetic operate point of ±16–42 Gauss. It features chopper-stabilized architecture for temperature stability and hysteresis of 5–15 Gauss, used for lid/cover detection in portable electronics.

For engineers reviewing the AH1893-FA-7 datasheet, AH1893-FA-7 pinout, AH1893-FA-7 application, or AH1893-FA-7 equivalent, key selection criteria include ultra-low quiescent current, bipolar magnetic sensitivity without polarity bias, integrated pull-up/pull-down, hibernating clocking system, and dual-package availability (X1-DFN1216-4/SOT553).

Technical Context

The AH1893 employs a chopper-stabilized Hall sensor core with internal hysteresis control and a hibernating clocking system that cycles between awake (100µs) and sleep (≈100ms) states to achieve micropower operation. Its output is actively driven low when B-field exceeds Bop (±16–42 G), and remains latched until B falls below Brp (±10–39 G).

Designed for battery-powered systems, it integrates internal pull-up and pull-down circuitry-eliminating external resistors-and delivers robust RF noise immunity and ±8kV HBM ESD protection. Magnetic switching thresholds are specified across -40°C to +85°C and supply voltages from 1.6V to 3.6V, with minimal drift due to chopper stabilization.

Key Specifications

Pinout & Package

Package: X1-DFN1216-4 (1.2 × 1.6 × 0.5 mm, 4-pin, bottom-exposed thermal pad, RoHS-compliant lead-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3320EUST-7 and US1881EUA-AAA-7, the AH1893-FA-7 uniquely balances ultra-low power (4.3µA), true omnipolarity, and compact DFN packaging-making it optimal for space- and energy-constrained portable designs where magnet orientation cannot be controlled.

Availability

AH1893-FA-7 is available at Aetrix Electronics and suitable for clamshell phone lid detection, tablet cover sensing, portable PC hinge monitoring, and home appliance door latch applications requiring stable component supply and long-term production continuity.

Supply support for AH1893-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The AH1893 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power, contactless position sensing in battery-operated consumer and industrial devices where size, current budget, and reliability are critical.

FAQ

What is the function of Pin 3 (NC) on the AH1893-FA-7 in X1-DFN1216-4?

Pin 3 is a no-connect terminal with no internal bond wire or silicon connection. It may be left unconnected or tied to ground for mechanical reinforcement during reflow soldering. It does not affect electrical performance, thermal behavior, or magnetic sensitivity, and must not be used as a signal or power path.

Does the AH1893-FA-7 require an external bypass capacitor?

Yes-a 100nF ceramic capacitor between VDD and GND is recommended per the datasheet to stabilize supply voltage during output transitions and improve RF noise immunity. Placement within 2mm of the VDD/GND pins is required to maintain micropower integrity and switching accuracy across temperature and voltage ranges.

How does the hibernating clocking system reduce power consumption?

The hibernating clocking system activates the Hall sensor and signal chain for only ~100µs every ~100ms, achieving a 0.1% duty cycle. This limits average current to 4.3µA at 1.85V while maintaining full magnetic responsiveness-unlike duty-cycled alternatives that introduce detection latency or missed events.

Can the AH1893-FA-7 operate reliably at 1.6V supply voltage?

Yes-the device is fully specified and tested down to 1.6V, with guaranteed Bop/Brp thresholds and 4.3µA average current at 1.85V scaling predictably to ~7.2µA at 3.6V. At 1.6V, typical operate point remains ±14–46G and output low voltage stays ≤0.2V with 1mA sink, meeting all functional requirements.