SFM-27 Piezo Buzzer Alarm 3-24VDC 95dB 30x15mm

The SFM-27 Piezo Buzzer Alarm is an active buzzer module that generates a continuous alarm tone whenever a DC voltage within its operating range is applied. Because the oscillator and drive electronics are integrated, it can be powered directly from a DC supply or a digital control line without requiring any external tone-generation circuitry, which simplifies alarm and indicator designs. With a nominal body diameter of about 30mm and a height around 15mm, the buzzer offers strong acoustic output while remaining compact enough for control panels, instrument housings, and embedded enclosures.

Features:

• Active piezoelectric buzzer with built‑in oscillation/drive circuit for continuous tone when powered.​
• Wide 3-24VDC operating range with 12VDC rated operation for flexible use with logic and power systems.​
• High sound pressure level, typically around 95–105dB at 12V depending on distance, suitable for loud alarms.​
• Nominal 30mm diameter and about 15–16mm height for compact but high‑output acoustic performance.​
• Resonant frequency near 2.5–3.1kHz for a clear, attention‑grabbing tone.  
  
  
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