Diodes Incorporated AH3373-P-A

Overview

AH3373-P-A from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect unipolar switch IC designed for proximity and position sensing in consumer home appliances and industrial systems. It operates from 3.0V to 28V, features ±55G/±35G typical operate/release points (BOP/BRP), includes chopper-stabilized architecture for temperature stability, and delivers open-drain output with 60mA continuous current capability and integrated Zener clamps on VDD and OUTPUT pins.

For engineers reviewing the AH3373-P-A datasheet, AH3373-P-A pinout, AH3373-P-A application, or AH3373-P-A equivalent, this device supports robust contactless switching in high-noise, wide-temperature (-40°C to +125°C), and variable-supply environments - especially where magnetic polarity alignment, ESD immunity (>6kV HBM), and supply reverse protection are critical selection criteria.

Technical Context

The AH3373 employs dynamic offset cancellation via chopper stabilization at 800kHz, enabling minimal switch-point drift across temperature and supply voltage. Its internal bandgap regulator provides temperature-compensated biasing for all analog blocks, ensuring stable BOP/BRP thresholds over -40°C to +125°C.

Magnetic operation is unipolar and polarity-sensitive: SOT23 and SIP-3 packages activate with South pole applied to the part-marking side, while SC59 requires South pole on the non-marking side. The single open-drain output switches low when B > BOP and remains latched until B < BRP, with 20G typical hysteresis for noise immunity.

Key Specifications

Pinout & Package

Package: SIP-3 (Ammo Pack) - 3-pin single-inline package with straight leads, RoHS-compliant, halogen-free, and rated for 550mW power dissipation at 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3323 and AL3373, the AH3373-P-A uniquely combines 28V operation, reverse supply blocking, and SIP-3 ammo-pack packaging - making it optimal for high-reliability, drop-in replacement in existing appliance and industrial designs requiring field robustness and supply flexibility.

Availability

AH3373-P-A is available at Aetrix Electronics and suitable for refrigerator door detection, automatic soap dispensers, industrial conveyor belt position sensing, and smart vacuum cleaner brush roll monitoring requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for AH3373-P-A 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.

The AH3373 belongs to Diodes' high-voltage Hall-effect switch product line, engineered specifically for contactless position and proximity sensing in harsh, wide-supply environments where reliability, ESD resilience, and magnetic consistency are non-negotiable.

FAQ

What magnetic polarity activates the AH3373-P-A?

The AH3373-P-A uses SIP-3 (Ammo Pack) packaging, which requires a South pole applied to the part-marking side to activate. This is confirmed in the datasheet's pin diagrams and magnetic characteristics table (BOPS definition). North pole exposure or zero field leaves the output high-impedance.

Does AH3373-P-A require an external capacitor on VDD?

Yes - a 10nF to 100nF ceramic decoupling capacitor (CIN) is recommended between VDD and GND per the Typical Applications Circuit. This stabilizes the internal bandgap regulator and improves RF noise immunity, especially in motor-driven or switching-power-supply environments.

Can AH3373-P-A be used with 3.3V microcontrollers?

Yes - its 3.0V minimum supply voltage and open-drain output allow direct interface with 3.3V logic. Use a 3.3V pull-up resistor on OUTPUT; the output saturation voltage stays ≤0.4V at 20mA, ensuring clean low-level signaling to MCU inputs.

Is AH3373-P-A pin-compatible with AH3373-SA-7 (SOT23)?

No - although both share identical electrical functionality and pin functions (VDD/GND/OUTPUT), the SIP-3 (Ammo Pack) package has straight leads in 1-2-3 linear order, while SOT23 uses a triangular 1-2-3 top-view layout with different pad spacing and thermal profile. PCB layout is not interchangeable.