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.
