The SFM-27-II is a high-decibel piezoelectric electronic buzzer designed for clear, intermittent signalling. It features an integrated drive circuit that produces a pulsing "beep-beep" sound when power is applied, making it ideal for warning systems, safety alarms, and industrial equipment notifications.

Specifications

• Model: SFM-27-II
• Sound Type: Intermittent (Pulsing Beep)
• 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

• Wide Voltage Range: Operates reliably from 3V up to 24V, allowing it to be used with a variety of power sources, from small batteries to industrial DC rails.
• High Decibel Output: Produces a loud 90dB signal that ensures the alarm is audible even in noisy environments.
• Intermittent Signal: Automatically generates a pulsing tone, which is more effective at capturing attention than a continuous steady tone.
• Easy Installation: Designed with two mounting ears (flanges) and pre-tinned wire leads for quick mechanical and electrical setup.
• Low Power Consumption: Consumes very little current, making it suitable for battery-powered devices and low-power microcontroller circuits.
• Durable Housing: Constructed from robust ABS plastic, designed to withstand standard industrial operating conditions.

Common Applications

• Reverse alarms for vehicles and warehouse equipment.
• Safety indicators for medical devices and laboratory equipment.
• Fault notifications in industrial control panels and UPS systems.
• Audible feedback for DIY electronics and security alarm projects.