The A3134ELT is a miniature, low-power, Hall-effect switch from Allegro MicroSystems. It is designed for use in a wide range of applications requiring simple on-off switching based on the presence of a magnetic field. This device integrates a Hall-effect sensor, amplifier, Schmitt trigger, and an open-collector output to provide a clean, reliable digital signal.

Applications

• Proximity detection
• Position sensing
• Level sensing
• Simple on/off switching
• Magnetic actuation

Features

• Small size (SOT23W package)
• Low power consumption
• High sensitivity
• Single-supply operation
• Built-in reverse battery protection
• Solid-state reliability

Benefits

• Provides reliable and accurate switching performance.
• Reduces system power consumption.
• Simplifies system design and reduces component count.
• Ideal for space-constrained applications.
• Offers a cost-effective solution for simple magnetic sensing applications.

Additional Details

The A3134ELT Hall-effect switch is activated by a south pole of sufficient strength. The output switches low when the magnetic field strength exceeds the operate point (Bop) and switches high when the magnetic field is removed. The small SOT23W package is suitable for automated assembly. The device operates from a single supply voltage and includes reverse battery protection to prevent damage from incorrect power supply connections. The open-collector output allows for flexible interfacing with various microcontrollers and logic circuits.