Diodes Incorporated AH3373-W-7

Overview

AH3373-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 and consumer appliances. It operates from 3.0V to 28V, features BOP = +55 G (typ), BRP = +35 G (typ), and delivers open-drain output with overcurrent limit and Zener clamping on supply/output pins.

For engineers reviewing the AH3373-W-7 datasheet, AH3373-W-7 pinout, AH3373-W-7 application, or AH3373-W-7 equivalent, key selection criteria include magnetic operate/release polarity (south pole to non-marking side for SC59), chopper-stabilized temperature stability, and robust ESD immunity (>6 kV HBM) across –40°C to +125°C.

Technical Context

The AH3373 employs chopper-stabilized architecture with dynamic offset cancellation and an internal bandgap regulator, enabling minimal switch-point drift (<26 G hysteresis over temperature) and superior thermal stability. Its functional block includes sample-and-hold, low-pass filtering, and a power switch driving a single open-drain output.

Magnetic actuation is polarity-specific: for SC59 packages, activation requires south pole applied to the non-part-marking side. The device integrates reverse-blocking diode, supply/output Zener clamps, and output current limiting (30–55 mA), supporting reliable operation under electrical stress and RF noise.

Key Specifications

Pinout & Package

Package: SC59 - Surface-mount, 3-pin, single-ended Hall sensor package with exposed die pad for thermal performance; dimensions: 2.80 mm × 3.00 mm × 0.95 mm (L × W × H), pin pitch 1.90 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3373QW-7 and AH3323-W-7, the AH3373-W-7 offers optimal balance of sensitivity, protection, and cost for industrial and high-reliability consumer applications - delivering verified 55 G operation, integrated reverse protection, and 6 kV ESD without automotive overhead.

Availability

AH3373-W-7 is available at Aetrix Electronics and suitable for washing machine lid detection, smart thermostat fan control, industrial conveyor position sensing, and electric toothbrush seal verification requiring stable component supply across long production lifecycles.

Supply support for AH3373-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, application-optimized components for industrial, computing, and consumer markets.

The AH3373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in harsh ambient conditions and wide-input-voltage systems.

FAQ

What is the correct magnetic polarity and orientation for activating the AH3373-W-7?

For the SC59-packaged AH3373-W-7, activation requires a south pole applied to the non-part-marking side of the package. This is opposite to SOT23/SIP-3 variants. Magnetic flux must be perpendicular to the package surface, and BOP is +55 G typical at 25°C. Orientation is confirmed by the "W" suffix designation and SC59 pin-1 marking location.

Does the AH3373-W-7 require an external pull-up resistor on its output?

Yes - the AH3373-W-7 has an open-drain output and requires an external pull-up resistor (RL) to VDD or another logic rail. Recommended RL values range from 1 kΩ to 10 kΩ depending on rise time and power requirements; typical design uses 4.7 kΩ with 10 nF to 100 nF bypass capacitor (CIN) on VDD for noise immunity.

Can the AH3373-W-7 operate reliably at 28 V continuously?

Yes - 28 V is the maximum continuous operating supply voltage per the Recommended Operating Conditions table. The 32 V absolute maximum rating applies only to transient stress and must not be sustained. At 28 V, IDD remains ≤4 mA across –40°C to +125°C, and thermal derating follows the SC59 power dissipation curve (230 mW at 25°C, decreasing linearly to 0 mW at 150°C).

How does the chopper stabilization in the AH3373-W-7 improve performance over conventional Hall switches?

Chopper stabilization dynamically cancels offset voltage in the Hall element and amplifier chain, reducing temperature-induced drift to <±0.5 mV and minimizing BOP/BRP variation across –40°C to +125°C. This yields stable switching thresholds without calibration, eliminates warm-up drift, and enhances immunity to mechanical stress and PCB layout asymmetry.