The SFM-27-I is a high-decibel piezoelectric electronic buzzer designed for steady, continuous signalling. Unlike its intermittent counterpart, this model produces a constant "beep" tone when power is applied, making it suitable for status indicators, constant warning signals, and proximity alerts.

Specifications

• Model: SFM-27-I
• Sound Type: Continuous (Steady Tone)
• Operating Voltage: DC 3V to 24V
• Rated Voltage: 12V DC
• Rated Current: <= 12mA at 12V DC
• Sound Pressure Level: >= 90dB at 10cm / 12V DC
• Resonant Frequency: 3000 +/- 500 Hz
• Operating Temperature: -20 C to +60 C
• Mounting Type: Flange mount (Two holes)

Features

• Consistent Signal: Produces a solid, unwavering tone that is ideal for applications where a pulsing sound might be confusing or unwanted.
• Broad Voltage Compatibility: Operates across a wide range from 3V to 24V, allowing integration into both low-voltage logic circuits and higher-voltage industrial systems.
• Loud Output: The 90dB output ensures the signal remains audible even over background machinery or ambient noise.
• Internal Drive Circuit: Contains all necessary electronics to generate the sound; simply apply a DC voltage to activate it.
• Simple Installation: Equipped with mounting flanges for secure attachment to panels or enclosures and pre-stripped wire leads for easy soldering.
• Efficient Power Usage: Extremely low current draw (<=12mA) makes it safe to drive directly from many sensor outputs or transistor circuits.

Common Applications

• Steady-state fault indicators in server racks and control panels.
• Audio feedback for user input in industrial kiosks.
• Low-battery or power-loss warning signals.
• Continuity testers and basic DIY electronic diagnostic tools.