Diodes Incorporated AH3524-P-B

Overview

AH3524-P-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect omnipolar switch IC designed for contactless position and proximity sensing in industrial and home appliance systems. It operates from 3.0V to 28V, features ±20G to ±40G operate points (BOP), ±10G to ±25G release points (BRP), 10 µs typical power-on time, and an open-drain output with 30–55 mA current limit - deployed in flow meters, lid-open detection, and level-sensing circuits.

For engineers reviewing the AH3524-P-B datasheet, AH3524-P-B pinout, AH3524-P-B application, or AH3524-P-B equivalent, this page delivers verified functional identity, validated magnetic thresholds, confirmed SOT23/SIP-3 package mapping, real-world timing specs (t_D = 4 µs, t_{P_ON} = 10 µs), and design-meaningful electrical parameters including V_{OUT_ON} ≤ 0.4 V at 20 mA and I_{OUT_OFF} < 0.1 µA.

Technical Context

The AH3524-P-B uses chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress effects, enabling stable switching across –40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring consistent BOP/BRP hysteresis (9–22 G) over full voltage (3–28 V) and temperature range.

It integrates reverse-blocking diode protection, Zener clamps on both VDD and OUTPUT pins, and output overcurrent limiting (IOCL). The single open-drain output responds to either South or North pole magnetic fields perpendicular to the package surface - no polarity selection required - making it suitable for bidirectional actuation in rotating or sliding mechanisms.

Key Specifications

Pinout & Package

AH3524-P-B is supplied in SIP-3 (Bulk Pack) package - straight-lead, 3-pin single-in-line configuration with 1.27 mm lead pitch and 14.5 mm body length. This through-hole package supports high-reliability mounting in industrial control panels and white-goods PCBs subject to vibration or thermal cycling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3212LLHLT-T and US1881EUA-ABA-001-SP, AH3524-P-B uniquely combines 28 V operation, reverse-polarity tolerance, dual Zener clamps, and SIP-3 bulk-pack availability - making it the only choice for cost-sensitive, high-reliability 24 V industrial sensing where board-level protection must be minimized.

Availability

AH3524-P-B is available at Aetrix Electronics and suitable for washing machine lid detection, industrial flow metering, smart thermostat position sensing, and conveyor belt object presence requiring stable component supply across automotive-tier production volumes and extended lifecycle planning.

Supply support for AH3524-P-B 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 devices, with emphasis on high-reliability solutions for industrial, computing, and consumer markets.

AH3524-P-B belongs to the AH35xx Hall-effect switch product line, engineered specifically for robust, maintenance-free position sensing in harsh environments - prioritizing wide voltage range, magnetic hysteresis stability, and integrated protection over ultra-low power or digital interface features.

FAQ

What is the magnetic polarity requirement for AH3524-P-B operation?

AH3524-P-B is an omnipolar switch: it activates with either South or North pole magnetic fields applied perpendicular to the marked surface of the SIP-3 package. No magnet polarity orientation is required during mechanical integration - simplifying assembly and reducing field failure risk from incorrect magnet placement.

Can AH3524-P-B drive a 24 V logic input directly?

Yes. Its open-drain OUTPUT pin supports up to 28 V off-state voltage and includes an integrated 28 V Zener clamp. When paired with an external pull-up resistor to 24 V, it delivers a valid logic-low (≤0.4 V at 20 mA) and withstands inductive transients common in 24 V control systems without external protection components.

Does AH3524-P-B require an external capacitor on VDD?

Yes. A 10 nF to 100 nF ceramic decoupling capacitor (C_IN) is recommended between VDD and GND per the datasheet. This stabilizes the internal bandgap regulator, improves noise immunity, and ensures reliable startup within the specified 10 µs t_{P_ON} - especially critical in electrically noisy industrial environments.

How does AH3524-P-B differ from AH3522-P-B in magnetic sensitivity?

AH3524-P-B has higher magnetic sensitivity: BOP of ±20G to ±60G and BRP of ±10G to ±45G, versus AH3522-P-B's ±8G to ±30G BOP and ±2G to ±25G BRP. This makes AH3524-P-B better suited for applications requiring longer air gaps, weaker magnets, or tighter positional repeatability - such as precision flow metering or compact appliance actuators.