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The BMT9111A is a specific model of Hall Effect Sensor manufactured by ATMEL (now part of Microchip Technology). Below are its key specifications, descriptions, and features:

Specifications:

• Type: Hall Effect Sensor (Digital Output)
• Operating Voltage: 3.5V to 24V
• Output Type: Open-Collector (Sink)
• Operating Temperature Range: -40°C to +85°C
• Output Current (Max): 20mA
• Magnetic Sensitivity: Typically 35 Gauss (Bop) and -35 Gauss (Brp)
• Switching Hysteresis: ~10 Gauss
• Response Time: <5µs

Description:

The BMT9111A is a digital Hall-effect switch that provides a TTL-compatible output in response to changes in magnetic flux density. It is designed for proximity sensing, position detection, and speed measurement applications. The sensor operates with a bipolar magnetic field (both North and South poles) and features an open-drain output for easy interfacing with microcontrollers or logic circuits.

Features:

• Wide Voltage Range (3.5V–24V) – Suitable for automotive and industrial applications.
• High Sensitivity – Detects low magnetic fields (~35 Gauss).
• Fast Response Time – Enables high-speed sensing.
• Reverse Polarity Protection – Protects against incorrect power supply connections.
• Robust Design – Operates reliably in harsh environments.
• Small Form Factor – Available in TO-92 or SOT-23 packages.

This sensor is commonly used in automotive systems, brushless DC motor control, and position sensing applications.

*(Note: ATMEL was acquired by Microchip Technology in 2016, so this product may now be listed under Microchip’s catalog.)*