SFM-20B Piezoelectric Electronic Buzzer (3-24V DC)

Overview

The SFM-20B Piezoelectric Buzzer is a high-efficiency audible signal device designed for applications that require a pulsing (intermittent) alert. Unlike continuous beepers, the SFM-20B produces a distinct "beep-beep-beep" sound, making it significantly more effective at grabbing attention in busy or noisy environments.

With its wide voltage compatibility and low current draw, the SFM-20B is the industry standard for fault indicators, timers, and safety notification systems.

Key Features and Benefits

• Distinct Intermittent Tone: Built-in circuitry generates a rhythmic pulsing sound that is more noticeable to the human ear than a steady tone.

• Versatile Voltage Range: Operates reliably from 3V to 24V DC, allowing for seamless integration with 5V microcontrollers (Arduino/ESP32), 12V automotive systems, and 24V industrial circuits.

• High-Volume Output: Delivers a crisp 95dB signal, ensuring the alarm is heard from a distance or through equipment housing.

• Energy Efficient: Consumes less than 15mA, making it perfect for battery-powered devices where power conservation is critical.

• Plug-and-Play Design: As an active buzzer, it requires no external frequency programming. Simply apply power, and it begins pulsing immediately.

  Technical Specifications

  Parameter	Specification
  Model	SFM-20B
  Sound Type	Intermittent (Pulsing / Beep-Beep)
  Operating Voltage	3V – 24V DC
  Rated Voltage	12V DC
  Current Consumption	≤ 15mA
  Sound Pressure Level	≥ 95dB (at 10cm)
  Resonant Frequency	3000 ± 500 Hz
  Color	Industrial White/Cream
  Mounting	Flange Mount (2-hole)