Piezo Buzzer 9*5.5mm

Physical Dimensions

• Diameter: 9mm

• Height: 5.5mm

• Pin Pitch: ~4mm (center-to-center)

Electrical & Acoustic Characteristics

• Operating Voltage: Typical 3-5 V DC

• Current Draw: Around 20—90mA depending on model; typical electromagnetic needs ~80mA @ rated voltage

• Resonant Frequency: 2.7—2.8kHz (2,500—2,800Hz)

• Sound Pressure Level (SPL): 80—85dB @ 10cm

Environmental Specs

• Operating Temperature: —20°C to +70°C (common for small electromechanical buzzers)

• Storage Temperature: Similar typical range (—20→+70°C)

Examples & Available Part Models

• AATC AC903QLF (EM, 3VAC, 2.731kHz, 80mA, 82dB) — Popular 9×5.5mm electromagnetic buzzer

• AATC AX905P3 (3VDC, 2.7kHz, 80dB @ 10cm, ~30mA) — Another common through-hole version

• FBPT9055 Piezo Transducer (passive, 5V, 2mA, 80dB, ~4kHz) — Higher frequency resonator alternative

Summary Table

Applications

This compact piezo buzzer is ideal for:

• Audible alerts in electronics (Arduino, Raspberry Pi, microcontrollers)

• Alarm panels, timers, industrial indicators

• Portable devices and toys requiring small-footprint sound output