9mm Passive Magnetic Buzzer 3VAC

Product Overview The QMB-09B-03 is a compact 9.0 × 5.5 mm through-hole electromagnetic passive buzzer engineered for low-voltage applications. Featuring a 16 Ω coil resistance and 2.7 kHz resonant frequency, this magnetic transducer delivers reliable acoustic signaling in 3.3V logic and Li-ion battery-powered systems. Jiangsu Huaneng designs this passive buzzer for engineers seeking direct MCU GPIO drive capability without additional driver complexity. Key Advantages Voltage-Optimized Design: The 16 Ω impedance is specifically matched for 3V to 3.3V direct drive, simplifying circuit design for portable electronics. High Sound Pressure: Delivers ≥ 85 dB SPL at 10 cm when driven at rated voltage and resonant frequency, ensuring audible alerts even in moderate ambient noise. Thermally Robust Housing: Black PBT housing (UL94 V-0 rated) withstands wave soldering at 255 °C and manual rework at 360 °C without deformation or acoustic degradation. Legacy Footprint Compatibility: Standard 9.0…

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