Description
🔍 Technical Specifications
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Model: TMB12A03
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Type: Active/emitter buzzer (built‑in oscillator)—beeps continuously when DC voltage is applied
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Rated Voltage: 3 V DC (operable within 1.5–4 V DC range)
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Rated Current: typically, < 30 mA (25 mA max according to some sources)
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Sound Pressure Level (SPL): ~85 dB at 10 cm (variously 82–85 dB reported)
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Frequency: ~2.3 kHz (2,300 ±300 Hz)
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Dimensions: ~12 mm diameter, ~9.5–9.8 mm height, pin pitch ~7.6 mm
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Operating Temperature: –20 °C to +70 °C
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Mounting: Through‑hole with two straight leads—breadboard/PCB friendly
🧠 Behavior & Usage
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The active buzzer has an internal oscillating circuit, so applying a constant DC voltage (3 V) results in a continuous tone—no external PWM needed
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Arduino forum advice:
“The TMB12A03 is an active buzzer. You shouldn’t pulse it. Apply a constant DC voltage to activate the buzzer.”
📊 Quick Comparison Table
Parameter | Value |
---|---|
Operating voltage | 1.5–4 V DC (nominal 3 V DC) |
Current draw | < 30 mA (up to 25 mA typical) |
Tone frequency | 2,300 ± 300 Hz |
Sound level | ~85 dB @10 cm |
Size (D×H) | 12 mm × ~9.5 mm |
Mounting | Through-hole (2-pin) |
Temp. range | –20 °C to +70 °C |
✅ Applications
The TMB12A03 is ideal for any audible alert use-case, including:
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Microcontroller alarms (Arduino, Raspberry Pi)
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Security systems and smoke detectors
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Toys, timers, appliances, industrial indicators
Reviews
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