Diodes Incorporated AH3327-W-7

Overview

AH3327-W-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect unipolar switch IC in SC59 package, designed for proximity and position sensing in industrial appliances and personal care devices. It operates from 3.0V to 28V, features BOP = 95–140 G and BRP = 70–120 G (South pole activation on non-marking side), delivers 0.2 V typical output saturation voltage at 20 mA, and supports –40°C to +125°C ambient operation.

For engineers reviewing the AH3327-W-7 datasheet, AH3327-W-7 pinout, AH3327-W-7 application, or AH3327-W-7 equivalent, key selection criteria include magnetic operate/release thresholds, open-drain output current limit (30–55 mA), supply voltage range, thermal derating in SC59 package, and polarity-dependent mounting orientation for reliable switching.

Technical Context

The AH3327-W-7 implements chopper-stabilized architecture with dynamic offset cancellation to minimize temperature-induced drift in magnetic thresholds-BOP and BRP vary only ±15 G over –40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, ensuring stable switching points across full voltage (3–28 V) and temperature ranges.

Protection circuitry includes a reverse-blocking diode, zener clamps on VDD and OUTPUT pins (28 V clamp), and output overcurrent limiting. The single open-drain output switches low when perpendicular magnetic flux exceeds BOP and remains latched until flux falls below BRP, with 18–36 G hysteresis to prevent chatter near threshold.

Key Specifications

Pinout & Package

SC59 package: 3-pin surface-mount, 3.0 mm × 2.9 mm body, 1.1 mm max height, gull-wing leads, JEDEC standard footprint compatible with automated reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3212LLHLT-T and US1881EUA-ABA-002-REEL, AH3327-W-7 provides highest magnetic sensitivity (up to 140 G BOP), integrated output current limiting, and dual zener clamps-making it optimal for industrial 24 V systems requiring robustness and high-threshold reliability without external protection components.

Availability

AH3327-W-7 is available at Aetrix Electronics and suitable for washing machine safety interlocks, industrial conveyor position monitoring, electric toothbrush motor control, and smart appliance flow metering requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3327-W-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 for industrial, computing, consumer, and communications markets.

AH3327-W-7 belongs to the AH332X high-voltage Hall-effect switch family, engineered for rugged proximity sensing in harsh environments where wide supply range, thermal stability, and integrated protection are critical.

FAQ

What is the correct magnet orientation for AH3327-W-7 in SC59 package?

The AH3327-W-7 in SC59 package requires the South pole of the magnet to face the non-part-marking side of the device. This is opposite to SOT23 (Type S) and SIP-3 packages. Incorrect orientation results in no switching action. The part marking side is defined as the surface bearing the alphanumeric code (e.g., "S3F"), and the active Hall element is located beneath the opposite surface.

Can AH3327-W-7 operate directly from a 24 V industrial rail without external regulation?

Yes. AH3327-W-7 is rated for continuous operation from 3.0 V to 28 V, with absolute maximum VDD of 32 V (transient only). Its internal bandgap regulator and chopper-stabilized design ensure stable switching performance across the full 24 V nominal rail, including brown-out and surge conditions common in factory automation systems.

Does AH3327-W-7 require an external capacitor on VDD?

Yes. A 10 nF to 100 nF ceramic decoupling capacitor (CIN) is recommended between VDD and GND, placed as close as possible to the device pins. This stabilizes the internal supply, improves noise immunity against RF interference, and ensures reliable startup within the specified 10 µs power-on time.

How does the output current limit behave under short-circuit conditions?

When the OUTPUT pin is shorted to GND or a low-impedance load, the internal current-limit circuit activates at 30–55 mA (typical 42 mA), holding output voltage near 0.2 V while limiting power dissipation. This prevents thermal runaway and allows indefinite safe operation without external current-limiting resistors or fuses.