Diodes Incorporated AH1383-SA-7

Overview

AH1383-SA-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 when exposed to ≥45G south-pole magnetic flux (BOPS typ), making it ideal for smart cover detection in portable electronics and smoke detector lid sensing.

For engineers reviewing the AH1383-SA-7 datasheet, AH1383-SA-7 pinout, AH1383-SA-7 application, or AH1383-SA-7 equivalent, key selection criteria include its 45G/35G magnetic operate/release points, SOT23 (Type S) package compatibility, hibernating clock architecture for microamp-level power, and chopper-stabilized temperature stability across –40°C to +85°C.

Technical Context

The AH1383-SA-7 implements a chopper-stabilized Hall sensor with sleep/awake logic that cycles between ultra-low-power hibernation (IDD(SLEEP) ≤ 1μA) and brief active sampling (tAWAKE = 30–80μs), achieving 0.1% duty cycle. Its latch-and-output driver delivers open-drain output with VOL ≤ 0.25V at 1mA sink and VOH ≥ VDD–0.25V in off-state.

Magnetic switching is unipolar and south-pole-activated, with BOPS = 35–55G and BRPS = 25–45G at +25°C (±45°C range), yielding 10G typical hysteresis (BHY). The device requires no external pullup resistor and integrates internal offset cancellation for robust operation under mechanical stress and RF noise.

Key Specifications

Pinout & Package

Package: SOT23 (Type S), 3-pin surface-mount, 2.9mm × 2.4mm × 1.0mm body height, matte tin-plated leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3212LLHLT-T and US5881LUA-ABA-000-RE, the AH1383-SA-7 uniquely balances 45G sensitivity, 1.6μA average current, and SOT23-3 compactness - making it optimal for space- and energy-constrained consumer and safety-critical sensing where long-term reliability matters.

Availability

AH1383-SA-7 is available at Aetrix Electronics and suitable for smart cover detection, smoke detector lid sensing, and smart meter position switching requiring stable component supply, full traceability, and long-lifecycle support.

Supply support for AH1383-SA-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 high-volume industrial and consumer markets.

The AH138x series belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power magnetic position sensing in battery-operated and safety-critical applications such as IoT endpoints and home safety devices.

FAQ

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

The AH1383-SA-7 activates exclusively with the south pole of a magnet oriented toward the marked side of the package. North pole exposure produces no output change. Magnetic flux must be perpendicular to the package surface, with minimum BOPS = 35G at +25°C and 25G across full temperature range.

Does AH1383-SA-7 require an external pullup resistor on the OUTPUT pin?

No. The OUTPUT pin is a true open-drain structure with no internal pullup. An external pullup resistor (typically 4.7kΩ–10kΩ to VDD or another logic rail) is required for proper high-level logic interpretation by the host MCU or interface circuit.

Can AH1383-SA-7 operate from a 1.6V coin cell for extended periods?

Yes. With 1.6μA average supply current at 3V and stable operation down to 1.6V, the AH1383-SA-7 achieves >12-year battery life on a standard CR2032 (220mAh) when paired with appropriate duty-cycle timing - verified per DS44734 Rev. 2-2 data at TA = +25°C.

How does the hibernating clock system affect response time?

The hibernating clock wakes the sensor every 30–80ms for a 30–80μs sampling window. This yields worst-case latency of ~80ms from magnetic event to output change, but ensures 0.1% duty cycle. For applications needing faster response, the device must be held in awake mode via periodic VDD cycling - not recommended for battery use.