Active Buzzer TMB12A03

Technical Specifications

• Model: TMB12A03

• Type: Active/emitter buzzer (builtin oscillator)—beeps continuously when DC voltage is applied

• Rated Voltage: 3V DC (operable within 1.5—4V DC range)

• Rated Current: typically, <30mA (25mA max according to some sources)

• Sound Pressure Level (SPL): ~85dB at 10cm (variously 82—85dB reported)

• Frequency: ~2.3kHz (2,300±300Hz)

• Dimensions: ~12mm diameter, ~9.5—9.8mm height, pin pitch ~7.6mm

• Operating Temperature: —20°C to +70°C

• Mounting: Throughhole with two straight leads—breadboard/PCB friendly

Behavior & Usage

• The active buzzer has an internal oscillating circuit, so applying a constant DC voltage (3V) results in a continuous tone—no external PWM needed

• 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

Applications

The TMB12A03 is ideal for any audible alert use-case, including:

• Microcontroller alarms (Arduino, Raspberry Pi)

• Security systems and smoke detectors

• Toys, timers, appliances, industrial indicators