Diodes Incorporated AH3524A-SA-7

Overview

AH3524A-SA-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect omnipolar switch IC with internal pullup resistor, designed for proximity and position sensing in industrial appliances and personal care devices. It operates from 3.0V to 28V, features ±40G typical operate point (BOP), ±25G typical release point (BRP), and delivers 0.2V typical output on-voltage at 20mA load across –40°C to +125°C.

For engineers reviewing the AH3524A-SA-7 datasheet, AH3524A-SA-7 pinout, AH3524A-SA-7 application, or AH3524A-SA-7 equivalent, this device supports robust contactless switching in high-noise, wide-temperature, and high-voltage environments-especially where bipolar magnetic field detection, internal pullup simplification, and chopper-stabilized thermal stability are required.

Technical Context

The AH3524A employs chopper-stabilized architecture with dynamic offset cancellation and an internal bandgap regulator, enabling minimal switch-point drift (<15G hysteresis) and superior temperature stability over –40°C to +125°C. Its omnipolar response activates on either South or North pole exposure above BOP, latching low until flux drops below BRP.

Protection includes reverse-blocking diode, supply and output Zener clamps (28V), 30–55mA output current limit, and 8kV HBM ESD rating. The internally pulled-up output eliminates external resistor needs while maintaining 10–18kΩ pullup resistance across temperature and supply voltage.

Key Specifications

Pinout & Package

Package: SOT23 (Type S), 3-pin surface-mount package with 2.9mm × 2.4mm footprint, 0.95mm height, and matte tin-plated leads compliant with J-STD-020 Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3524EUA-7 and US5881LUA-7, the AH3524A-SA-7 delivers broader temperature support (+125°C), built-in pullup, and finer magnetic resolution - making it optimal for high-reliability, space-constrained, and thermally demanding industrial sensing.

Availability

AH3524A-SA-7 is available at Aetrix Electronics and suitable for industrial flow metering, appliance door detection, and personal care device positioning requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AH3524A-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, application-optimized components for industrial, computing, and consumer markets.

The AH3524A belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in high-voltage, high-noise, and wide-temperature environments.

FAQ

What magnetic field strength is required to activate the AH3524A-SA-7?

The AH3524A-SA-7 activates when perpendicular magnetic flux density exceeds ±40G (typical operate point, BOP), detectable from either South or North pole. Release occurs below ±25G (typical release point, BRP), delivering 15G hysteresis. These values are guaranteed across –40°C to +125°C and 3.0V–28V supply range, with minimal drift due to chopper stabilization.

Can the AH3524A-SA-7 operate directly from a 24V industrial rail without external regulation?

Yes - the AH3524A-SA-7 is explicitly rated for 3.0V to 28V operation and includes internal bandgap regulation, reverse-blocking diode, and 28V Zener clamp on VDD. It draws only 3–5mA supply current and withstands transient overvoltage, making it suitable for direct connection to unregulated 24V systems common in PLC I/O modules and motor controls.

Does the AH3524A-SA-7 require an external pullup resistor?

No - the AH3524A-SA-7 integrates a 10–18kΩ pullup resistor on the open-drain OUTPUT pin. This eliminates the need for external components, reduces PCB footprint, and avoids tolerance-related timing shifts. The internal pullup remains stable across temperature and supply voltage, ensuring consistent logic-level compatibility with standard CMOS inputs.

How does the chopper-stabilized architecture improve performance in real-world applications?

The chopper-stabilized design actively cancels offset voltage drift caused by temperature gradients and mechanical stress, reducing BOP/BRP shift to <±1.5G/°C. This enables reliable switching in environments with thermal cycling (e.g., oven controls) or vibration (e.g., pump housings), where conventional Hall switches would exhibit inconsistent thresholds or chatter.