Description
📏 Physical Dimensions
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Diameter: 9 mm
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Height: ≈ 5.5 mm
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Pin Pitch: ~4 mm (center-to-center)
⚡ Electrical & Acoustic Characteristics
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Operating Voltage: Typical 3 -5 V DC
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Current Draw: Around 20–90 mA depending on model; typical electromagnetic needs ~80 mA @ rated voltage
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Resonant Frequency: ≈2.7 – 2.8 kHz (2,500–2,800 Hz)
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Sound Pressure Level (SPL): ≥80–85 dB @ 10 cm
🌡️ Environmental Specs
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Operating Temperature: –20 °C to +70 °C (common for small electromechanical buzzers)
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Storage Temperature: Similar typical range (–20 → +70 °C)
🔧 Examples & Available Part Models
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AATC AC‑903Q‑LF (EM, 3 VAC, 2.731 kHz, 80 mA, 82 dB) – Popular 9 × 5.5 mm electromagnetic buzzer
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AATC AX‑905‑P3 (3 V DC, 2.7 kHz, 80 dB @ 10 cm, ~30 mA) – Another common through-hole version
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FBPT9055 Piezo Transducer (passive, 5 V, ≤2 mA, ≥80 dB, ~4 kHz) – Higher frequency resonator alternative
📝 Summary Table
| Parameter | Value |
|---|---|
| Diameter × Height | 9 mm × 5.5 mm |
| Pin Pitch | ~4 mm |
| Operating Voltage | 3–5 V DC (some 4–7 V/12 V versions) |
| Current Draw | 20–90 mA (typically 30–80 mA) |
| Resonant Frequency | ~2.7 kHz (2.5–2.8 kHz) |
| Sound Level (SPL) | ≥80–85 dB @10 cm |
| Operating Temp Range | –20 °C to +70 °C |
| Mount Type | Through-hole pins |
✅ Applications
This compact piezo buzzer is ideal for:
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Audible alerts in electronics (Arduino, Raspberry Pi, microcontrollers)
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Alarm panels, timers, industrial indicators
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Portable devices and toys requiring small-footprint sound output
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