THDZ-1625 4kHz Piezoelectric Passive Buzzer 1–30V Square Wave

The THDZ-1625 is a compact piezoelectric passive buzzer designed to generate audible tones and simple melodies when driven by an external square-wave signal. Unlike active buzzers that contain an internal oscillator and produce sound with a DC voltage, this passive buzzer requires an AC or PWM signal to operate. The frequency of the applied signal directly determines the pitch of the sound, giving the user full control over tone generation. The buzzer is tuned for a 4kHz resonant frequency, which falls within the most sensitive range of human hearing and produces a clear, piercing alert tone.

The device measures 16mm × 16mm with a low profile of approximately 2.5mm, making it suitable for space-constrained PCB layouts and compact enclosures. Its piezoelectric crystal element converts electrical energy into mechanical vibration, which is amplified by an internal diaphragm to produce sound pressure levels of approximately 80dB at 10cm. The buzzer operates across a wide voltage range of 1V to 30V peak-to-peak, with a rated square-wave voltage of 12Vp-p and a maximum current draw of 5mA. It is compatible with 3V to 5V Arduino and other microcontroller platforms, allowing direct drive without additional amplification for many applications.

The THDZ-1625 is a passive electromechanical-acoustic component—it does not include an internal oscillator, and applying a steady DC voltage will not produce sound. It is intended for alarm systems, notification boards, timers, electronic metronomes, household appliances, and educational projects that require a reliable, low-cost audible indicator. The buzzer is supplied with male pin leads for through-hole or header-based mounting.