Diodes Incorporated AH3327-SA-7

Overview

AH3327-SA-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect unipolar switch IC designed for proximity and position sensing in industrial home appliances and personal care devices. It operates from 3.0V to 28V, features open-drain output with 60mA continuous current rating, BOP of 95–140G (typ. 115G), BRP of 70–120G (typ. 90G), and operates across –40°C to +125°C.

For engineers reviewing the AH3327-SA-7 datasheet, AH3327-SA-7 pinout, AH3327-SA-7 application, or AH3327-SA-7 equivalent, key selection criteria include magnetic sensitivity thresholds, supply voltage range compatibility, open-drain drive capability, thermal derating in SOT23 (Type S), and polarity-dependent activation (South pole to part marking side).

Technical Context

The AH3327-SA-7 uses chopper-stabilized architecture with dynamic offset cancellation to achieve minimal switch-point drift and superior temperature stability over –40°C to +125°C. Its internal bandgap regulator provides temperature-compensated biasing for all subcircuits, enabling stable operation across its full 3.0V–28V supply range.

It integrates reverse-blocking diode protection, zener clamps on VDD and OUTPUT pins, and output overcurrent limiting (30–55mA). The device responds to perpendicular magnetic flux density (B) with 4µs typical response delay and 10µs power-on startup time after VDD reaches 3V.

Key Specifications

Pinout & Package

Package: SOT23 (Type S), surface-mount, 3-pin, lead-free and RoHS-compliant. Dimensions: 2.90 × 2.40 × 1.00 mm (D × E × A2). Thermal resistance θ_JA ≈ 320°C/W; max power dissipation = 230 mW at T_A = 25°C, derating linearly to 0 mW at 150°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3327TSA-7 and US1881LUA-AAA-7, AH3327-SA-7 delivers highest magnetic sensitivity in SOT23 format with integrated output zener protection-making it optimal for compact, high-reliability consumer and industrial proximity sensing where field strength is marginal or EMI is present.

Availability

AH3327-SA-7 is available at Aetrix Electronics and suitable for washing machine lid detection, cordless power tool trigger sensing, smart vacuum dustbin presence verification, and industrial conveyor belt position monitoring requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3327-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and communications markets.

AH3327-SA-7 belongs to the AH332X high-voltage Hall-effect switch family, engineered for robust, contactless position and proximity sensing in cost-sensitive, high-volume applications where reliability across wide voltage and temperature ranges is critical.

FAQ

What magnetic polarity activates the AH3327-SA-7?

The AH3327-SA-7 is a unipolar switch activated exclusively by the South pole. For the SOT23 (Type S) package (SA-7), the South pole must be presented to the part marking side of the package. This polarity requirement is fixed per package type and cannot be reversed via configuration.

Does AH3327-SA-7 require an external pull-up resistor?

Yes-AH3327-SA-7 has an open-drain output and requires an external pull-up resistor (RL) between VDD and OUTPUT. Recommended RL values range from 1kΩ to 10kΩ depending on rise time and bus loading; 4.7kΩ is typical for 12V systems with <1µs rise time.

Can AH3327-SA-7 operate directly from a 24V supply?

Yes-AH3327-SA-7 is fully specified for continuous operation from 3.0V to 28V. Its internal bandgap regulator and zener clamp on VDD allow direct connection to 24V industrial rails without external regulation or protection components.

Is a bypass capacitor required on the VDD pin?

Yes-a ceramic bypass capacitor (CIN) of 10nF to 100nF is recommended between VDD and GND, placed as close as possible to the device pins. This stabilizes the internal regulator and improves RF noise immunity, especially in electrically noisy environments like motor-driven appliances.