Diodes Incorporated AH1382-FS4-7

Overview

AH1382-FS4-7 from Diodes Incorporated is a high-sensitivity, ultra-low-power digital unipolar Hall-effect switch IC designed for magnetic position sensing in battery-constrained systems. It operates with 1.6V–5.5V supply, draws only 1.6μA average current at 3V, and switches on with south-pole magnetic fields ≥30G (typical BOPS), making it ideal for lid detection in smart meters and IoT end nodes.

For engineers reviewing the AH1382-FS4-7 datasheet, AH1382-FS4-7 pinout, AH1382-FS4-7 application, or AH1382-FS4-7 equivalent, key selection criteria include its 30G/20G magnetic operate/release points, X2-DFN1010-4 (Type B) 1.0×1.0mm package, 8kV HBM ESD rating, and chopper-stabilized architecture ensuring <10G hysteresis and minimal temperature drift over –40°C to +85°C.

Technical Context

The AH1382-FS4-7 implements a chopper-stabilized Hall sensor with sleep/awake logic that cycles at 30–80ms period, achieving 1.6μA average supply current. Its latch-and-output driver delivers open-drain output with 0.15V low-level voltage at 1mA sink, enabling direct interface to microcontroller GPIOs without external pull-ups.

It features hysteresis of 2–10G between BOPS (30G typ) and BRPS (20G typ), ensuring noise-immune switching under mechanical vibration or field fluctuation. The device uses an internal offset cancellation loop and requires no external capacitor for basic operation-though a 100nF bypass capacitor on VDD is recommended for RF noise immunity.

Key Specifications

Pinout & Package

Package: X2-DFN1010-4 (Type B), 1.0mm × 1.0mm × 0.39mm body, exposed thermal pad (no internal connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3320EUA-7 and TLE4913-2SA, AH1382-FS4-7 uniquely balances ultra-low power (1.6μA), miniature X2-DFN1010-4 packaging, and precise 30G/20G magnetic thresholds-making it optimal for space- and energy-constrained consumer and industrial IoT endpoints where automotive qualification or higher supply voltages are unnecessary.

Availability

AH1382-FS4-7 is available at Aetrix Electronics and suitable for smart metering, IoT endpoint sensing, and home appliance position monitoring requiring stable component supply and long-term lifecycle support.

Supply support for AH1382-FS4-7 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and sensing applications.

AH1382-FS4-7 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power magnetic position detection in battery-operated and space-constrained electronic systems.

FAQ

What is the magnetic polarity requirement for AH1382-FS4-7 activation?

The AH1382-FS4-7 is a unipolar Hall switch activated exclusively by the south pole of a magnet applied to the marked side of the package. North-pole exposure produces no response. The specified BOPS (30G typ) and BRPS (20G typ) values assume south-pole orientation perpendicular to the package surface, as confirmed in DS44734 Rev. 2–2 page 5.

Does AH1382-FS4-7 require an external pull-up resistor on the OUTPUT pin?

Yes-AH1382-FS4-7 has an open-drain output and requires an external pull-up resistor to establish a defined logic-high voltage when inactive. Typical values range from 4.7kΩ to 10kΩ depending on bus voltage and rise-time requirements; no internal pull-up is integrated, per Pin Descriptions section on page 3 of DS44734.

Can AH1382-FS4-7 operate from a 1.5V alkaline cell?

No-AH1382-FS4-7 has a minimum operating supply voltage of 1.6V per Recommended Operating Conditions (page 4 of DS44734). A fresh 1.5V alkaline cell may briefly exceed 1.6V under no load, but voltage drops rapidly under load and falls outside guaranteed operation; use 1.8V+ sources or regulated 1.8V/2.0V supplies for reliable function.

Is the exposed thermal pad on the X2-DFN1010-4 package electrically connected?

No-the center exposed pad on the X2-DFN1010-4 (Type B) package is not internally connected to any die node. Per Pin Descriptions note on page 3 of DS44734, it may be left unconnected or tied to GND for mechanical stability, but it provides no electrical or thermal conduction benefit to the Hall sensor or output driver.