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TMB12A03 3V Active Buzzer Module 12095

SKU: FA3048-3
Model

TMB12A03
Buzzer Type

Electromagnetic Active Buzzer (built-in driving circuit)
Rated Voltage

3V DC
Operating Voltage Range

1.5V – 4V DC
Resonant Frequency

2300Hz ± 300Hz
Sound Pressure Level

85dB @ 3V, 10cm
Current Consumption

~30mA (typical)
Package Size

Φ12mm × 9.5mm (DIP, 2-pin)

The TMB12A03 Active Buzzer Module is a compact, high-efficiency electromagnetic sound generator designed for low-voltage DC applications requiring clear audible alerts, notifications, and status feedback. Housed in a standard 12mm × 9.5mm cylindrical package (12095 form factor), this active buzzer features a built-in driving circuit, meaning it produces a fixed-frequency tone simply by applying a DC voltage within its operating range — no external PWM signal, tone generator, or complex driver circuitry is required .

At the heart of the TMB12A03 is an electromagnetic driving mechanism with an integrated oscillator module. When a DC voltage between 1.5V and 4V is applied across its two pins, the internal circuit generates an alternating current that drives the electromagnetic coil. This creates a cyclic magnetic field that causes the internal diaphragm to vibrate at a fixed resonant frequency of 2300Hz ± 300Hz, producing a clear, continuous tone . The sound pressure level reaches 85dB at 10cm when driven at the rated 3V, making it suitable for most indoor alert and notification applications .

The TMB12A03 is specifically designed for low-voltage operation, with a rated voltage of 3V and a wide operating range of 1.5V to 4V DC (some variants support up to 5V) . This makes it ideal for 3.3V microcontroller systems, single-cell lithium batteries (with regulation), and low-power embedded designs. Its low current consumption of approximately 30mA is suitable for battery-powered devices and energy-conscious designs .

The buzzer features a 2-pin through-hole (DIP) package with standard pin spacing, making it easy to mount on breadboards and PCBs. The positive pin is marked on the housing, and the polarity must be observed during connection — incorrect polarity may damage the component . The compact Φ12mm × 9.5mm form factor is a standard footprint for 12095 series buzzers, ensuring compatibility with existing PCB layouts .

The TMB12A03 is widely used in low-voltage security alarms, portable electronic devices, battery-powered timers, toys and novelties, medical devices, and educational STEM projects. It is also a popular choice for Arduino and DIY projects where a simple 3.3V-compatible audible indicator is required .

Important Note: The TMB12A03 is an active buzzer — it produces a fixed tone when powered and cannot play melodies or variable frequencies. For variable tones, use a passive buzzer with PWM control instead. When driving directly from a 3.3V microcontroller GPIO pin, note that the buzzer may draw up to 30mA, which exceeds the safe continuous current rating of many MCU pins (typically 20mA). For reliable operation, use an NPN transistor as a low-side switch to isolate the buzzer from the MCU . The buzzer is an open-frame design and is not waterproof — avoid exposure to moisture, corrosive gases, and direct contact with water .

Features

  • Active buzzer with built-in driving circuit — Produces sound directly from DC voltage; no PWM required

  • Low-voltage operation — Rated 3V, operating range 1.5V–4V DC; compatible with 3.3V systems

  • Fixed 2.3kHz tone — Clear, stable continuous sound for alarms and notifications

  • 85dB sound pressure — Loud enough for most indoor alert applications

  • Low current consumption — Approximately 30mA, suitable for battery-powered designs

  • Compact 12×9.5mm package — Standard 12095 form factor for easy PCB integration

  • 2-pin through-hole mounting — Simple breadboard and PCB installation

  • Clear polarity marking — Positive pin indicated on housing

  • Wide application range — Portable devices, low-voltage alarms, toys, medical equipment, education

  • Cost-effective — Affordable solution for audible indication in volume production

Technical Specifications 

# Parameter Specification
1 Model TMB12A03
2 Buzzer Type Electromagnetic Active Buzzer (built-in driving circuit)
3 Rated Voltage 3V DC
4 Operating Voltage Range 1.5V – 4V DC
5 Resonant Frequency 2300Hz ± 300Hz
6 Sound Pressure Level 85dB @ 3V, 10cm
7 Current Consumption ~30mA (typical)
8 Package Size Φ12mm × 9.5mm (DIP, 2-pin)

Usage

Getting Started

  1. Identify the pins — The positive terminal (+) is marked on the buzzer housing. Observe polarity carefully.

  2. Connect power — Apply 3V DC (or 1.5V–4V) across the buzzer pins (positive to +, negative to -). The buzzer will produce a continuous tone immediately.

  3. Control with a microcontroller — For 3.3V MCU control, connect the buzzer through a transistor driver circuit (recommended) or directly to a GPIO pin if current is limited.

  4. Transistor driver circuit — Connect buzzer positive to VCC (3.3V), buzzer negative to transistor collector, transistor emitter to GND, and transistor base to MCU GPIO through a resistor (e.g., 1kΩ).

  5. Upload control code — Set the GPIO pin HIGH to turn the buzzer on, LOW to turn it off.

Pin Connections

Buzzer Pin Function
Positive (+) Connect to VCC (3V–3.3V)
Negative (-) Connect to GND (or transistor collector)

Example Arduino Code (Direct GPIO Control)

cpp
#define BUZZER_PIN 8

void setup() {
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  digitalWrite(BUZZER_PIN, HIGH);  // Buzzer ON
  delay(500);
  digitalWrite(BUZZER_PIN, LOW);   // Buzzer OFF
  delay(500);
}

Transistor Driver Circuit (Recommended for Reliable Operation)

Component Connection
Buzzer + VCC (3.3V)
Buzzer – Transistor Collector
Transistor Emitter GND
Transistor Base MCU GPIO via 1kΩ resistor

Typical Applications

  • Low-voltage security alarms — Portable smoke detectors, gas alarms, door sensors

  • Portable electronic devices — Battery-powered timers, health monitors, handheld instruments

  • Toys and novelties — Sound effects for interactive play

  • Medical equipment — Blood pressure monitors, glucose meters, portable diagnostic devices

  • Educational STEM projects — Teaching digital output and sound generation at low voltages

  • Arduino and DIY projects — Simple 3.3V-compatible audible feedback for makers

Notes for Business Buyers

  • Active buzzer — Fixed tone, no PWM required; simple DC voltage drive.

  • Transistor driver recommended — For 3.3V MCU designs, use a transistor to avoid exceeding GPIO current limits.

  • Low-voltage operation — 1.5V–4V range supports 3.3V systems and low-power battery designs.

  • Suitable for bulk purchasing — Ideal for portable device manufacturers, toy makers, and educational institutions.

Q: What is the TMB12A03 Active Buzzer used for?

It is an active electromagnetic buzzer for producing audible alerts and notifications in low-voltage circuits, used in portable devices, security alarms, toys, medical equipment, and educational projects .

Q: What is the difference between the TMB12A03 and TMB12A05?

The TMB12A03 is rated for 3V operation (1.5V–4V range), making it ideal for 3.3V systems. The TMB12A05 is rated for 5V operation (4V–8V range). Choose based on your system voltage .

Q: What voltage does the buzzer require?

The rated voltage is 3V DC, with a wide operating range of 1.5V to 4V DC .

Q: What is the sound output frequency and volume?

The buzzer produces a fixed tone at approximately 2300Hz ± 300Hz with a sound pressure level of 85dB at 10cm .

Q: How do I connect the buzzer to a 3.3V Arduino?

For direct GPIO control: connect the positive pin (+) to a digital pin and the negative pin (-) to GND. However, for reliable operation, use a transistor driver because the buzzer may draw up to 30mA, exceeding safe GPIO current limits .

Q: Why does my buzzer only click instead of producing a continuous tone?

You may be using the Arduino tone() function, which is designed for passive buzzers. For active buzzers like the TMB12A03, use digitalWrite(pin, HIGH) to supply steady DC voltage instead.

Q: Can I use a transistor to drive the buzzer?

Yes, and it is recommended for reliable operation. Use an NPN transistor (e.g., 2N3904, S8050) with the buzzer connected between VCC and the collector, emitter to GND, and base to MCU GPIO through a 1kΩ resistor .

Q: Is the buzzer waterproof?

No. The TMB12A03 is an open-frame design and is not waterproof. Avoid exposure to moisture, water, and corrosive gases .

Q: Can I play different tones or melodies with this buzzer?

No. The TMB12A03 is an active buzzer with a fixed tone. It cannot play melodies or variable frequencies. For variable tones, use a passive buzzer with PWM.

Q: Can I purchase in bulk for a product development project?

Yes. The TMB12A03 is suitable for bulk purchasing by portable device manufacturers, toy makers, and educational institutions.

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