CMT-8540S-SMT-TR
Overview
The CMT-8540S-SMT-TR is a compact 8.5mm x 8.5mm magnetic buzzer transducer designed for surface mount applications. As an externally driven device, it requires an oscillating signal to produce sound, offering engineers flexibility in tone generation at a rated frequency of 4000 Hz. It operates across a wide voltage range of 1V to 6V, making it suitable for various logic level systems.
Why Choose This Part
This transducer delivers a high sound pressure level of 100dB at 10cm, ensuring clear audibility even in noisy environments. Its small SMT footprint and top-port design allow for efficient PCB space utilization and streamlined automated assembly. The wide 1V to 6V operating range provides compatibility with both 3.3V and 5V microcontrollers.
Applications
Key Specifications
Getting Started
To drive this transducer, provide a square wave signal at the 4kHz resonant frequency using a microcontroller PWM peripheral. Since the peak current can reach 150mA, use a switching transistor or a dedicated buzzer driver circuit rather than driving the pins directly from an MCU GPIO. Ensure a flyback diode is included if using an inductive driving circuit to protect against voltage spikes.
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