Huaneng Building

The MLT-4020H is an electromagnetic surface-mount buzzer designed with a built-in driving circuit for easy application integration. When you apply DC voltage, current flows through the voice coil, creating a magnetic field. This causes the diaphragm to vibrate, producing a clear and consistent sound output. This buzzer type features a narrow operating voltage range from 2V to 4V, with a rated voltage of 3V, making it ideal for portable and battery-powered devices.

With a compact footprint of just 4.0mm × 4.0mm and a low-profile height of 2.0mm, the MLT-4020H is one of the smallest electromagnetic buzzers available, perfectly suited for space-constrained PCB layouts. Despite its miniature size, it delivers a reliable sound output of ≥65dB at 10cm, ensuring effective audible alerts in compact electronic devices.

The housing is made of black LCP material, offering excellent heat resistance and mechanical stability. The component is reflow soldering compatible, ensuring reliable assembly in automated production lines. With a resonant frequency of 4000Hz, this buzzer provides a sharp and recognizable alert tone.

Whether you are designing for wearable devices, portable electronics, medical equipment, consumer electronics, or IoT applications, the MLT-4020H delivers consistent performance in a miniature package. Its open-design structure allows for optimal sound emission, though it should be used in environments free from corrosive gases and moisture exposure to ensure long-term reliability.

Our extensive capabilities make our electromagnetic buzzers an excellent solution for any audio alert application. If you are having trouble choosing between the different types of buzzers we offer, please contact us for assistance.