Diodes Incorporated AH1383-FS4-7

Overview

AH1383-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 activates on south-pole magnetic fields ≥45G (typical BOP), making it ideal for lid detection in smart meters and IoT end nodes.

For engineers reviewing the AH1383-FS4-7 datasheet, AH1383-FS4-7 pinout, AH1383-FS4-7 application, or AH1383-FS4-7 equivalent, key selection criteria include its 45G/35G (BOP/BRP) magnetic sensitivity, X2-DFN1010-4 (Type B) 1.0×1.0mm package, chopper-stabilized temperature stability, and hibernating clock architecture enabling multi-year battery life.

Technical Context

The AH1383-FS4-7 implements a chopper-stabilized Hall sensor with sleep/awake logic and latch-based output driver, delivering ±10G magnetic hysteresis and <±7G total switch-point drift over –40°C to +85°C. Its hibernating clocking system cycles between 30–80ms periods, reducing average current while maintaining reliable wake-up latency of 30–80μs.

It features internal offset cancellation, no external pull-up requirement, and direct compatibility with low-voltage microcontrollers (1.6V min). The output is open-drain, sinking up to 1mA, with VOL ≤0.25V at 1mA and VOH ≥VDD−0.15V when off.

Key Specifications

Pinout & Package

Package: X2-DFN1010-4 (Type B), 1.0 mm × 1.0 mm × 0.39 mm 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 TMAG5170AHQDBVR, AH1383-FS4-7 uniquely balances ultra-low power (1.6μA), compact 1.0×1.0mm DFN packaging, and precise 45G/35G switching thresholds-making it optimal for space- and energy-constrained magnetic presence detection where digital on/off behavior suffices.

Availability

AH1383-FS4-7 is available at Aetrix Electronics and suitable for smart metering, portable electronics, and home appliance applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for AH1383-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 manufacturer of discrete semiconductors and integrated circuits, specializing in power management, signal integrity, and sensing solutions for industrial, consumer, and automotive markets.

AH1383-FS4-7 belongs to Diodes' high-sensitivity Hall-effect switch product line, engineered specifically for ultra-low-power magnetic position detection in battery-operated and space-constrained edge devices.

FAQ

What is the magnetic polarity requirement for AH1383-FS4-7 activation?

The AH1383-FS4-7 is a unipolar Hall-effect switch activated exclusively by the south pole of a magnet oriented toward the marked side of the package. North-pole exposure produces no output change. Typical operate point is 45 Gauss (BOP), with release at 35 Gauss (BRP), providing 10-Gauss hysteresis to prevent oscillation near threshold.

Can AH1383-FS4-7 operate directly from a 1.8V microcontroller I/O rail?

Yes. AH1383-FS4-7 supports supply voltages from 1.6V to 5.5V, making it fully compatible with 1.8V logic domains. Its open-drain output pulls low to ≤0.25V at 1mA sink current and floats high to the host rail voltage-enabling direct connection without level shifters or external pull-ups.

How does the hibernating clock affect response time and power savings?

The hibernating clock cycles the device between ~45μs active sampling windows and ~45ms sleep intervals, yielding 1.6μA average current at 3V. Output state updates only during awake periods, so maximum latency to detect a magnetic event is one full period (~45ms). This trade-off enables decade-scale battery life in infrequent-event applications like lid detection.

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

No. The center exposed pad on the X2-DFN1010-4 package has no internal electrical connection. It may be left unconnected or soldered to a thermal pad on the PCB solely for mechanical stability and thermal dissipation-no circuit routing or grounding is required or recommended.