SFM-27 Piezo Buzzer Alarm 3-24VDC 95dB 30x15mm
EGP 22
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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. Specifications: Parameter Value Model SFM-27 / SFM-27-I Type Active piezoelectric buzzer, continuous tone Operating Voltage 3-24 VDC Rated Voltage 12 VDC Sound Pressure Level Approx. 95-105 dB (at 12 VDC, measurement distance 10-30 cm) Resonant Frequency 2500-3100 Hz (±500 Hz) Rated Current Typically ≤ 15-32 mA Body Diameter ≈ 30 mm Body Height ≈ 15-16 mm Operating Temperature -20°C to +45/60°C Storage Temperature -20°C to +60°C Housing Color Black Sound Type Continuous alarm tone when powered Applications: Security systems such as burglar and fire alarms. Notification alerts in home automation and IoT devices. Warning signals in electronic timers and access controls. Audible feedback in toys, gadgets, and consumer appliances. Industrial equipment for error or status indications. DIY projects with microcontrollers like Arduino for sensor-triggered sounds. Package Include: 1x SFM-27 Piezo Buzzer Alarm 3-24VDC 95dB 30x15mm.
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