3kHz 39.5×20mm Alarm Buzzer with 90dB

BJ4020 Alarm Buzzer | 90dB Piezoelectric Buzzer The BJ4020 is a high-output alarm buzzer built on Piezoelectric Buzzer technology. With a loud Sound Output of min. 89dB at 30cm, it delivers piercing alerts for industrial and security systems. While sharing form factors with an Electromagnetic Buzzer or Mechanical Buzzer, this piezo unit offers ultra-low current (Max 5mA). It serves as a robust alternative to a SMD Piezo Buzzer in through-hole designs, and outperforms a standard Mylar Speaker in harsh alarm environments. Product Introduction The BJ4020 Buzzer features a 39.5mm round Black PPO housing. Driven by a 3kHz square wave, it generates a resonant frequency of 3000±500Hz. This piezo buzzer is designed for equipment warning tones where a standard Speaker lacks the piercing decibel output required. Product Physical Parameters Resonant Frequency 3000 ± 500Hz Operating Voltage 1 ~ 25 Vp-p Rated Current Max. 5mA (3kHz 50% duty) Sound Output Min. 89dB at 30cm Capacitance 3…

Magnetic Transducer External Drive Type SMD Piezoelectric Passive Buzzer SMD Magnetic Buzzer SMD Active Electromagnetic Buzzer Passive Electromagnetic Buzzer