Product Overview
The MSPT30D45P20V10 passive piezo sounder buzzer is a compact acoustic component designed for electronic alarm, notification, reminder, and signal output applications. With a 30.0×10.0mm size, low current consumption, and wide operating voltage range, it is suitable for compact electronic products and industrial control devices.
This passive piezo buzzer operates across 1.0–24.0V and delivers a minimum sound output of 85dB at 10cm under typical test conditions. Its rated frequency of 2500±500Hz makes it suitable for clear audible alerts in alarms, instruments, home appliances, security products, medical devices, and embedded electronic systems.
As a passive buzzer, this component requires an external driving signal to generate sound, allowing engineers to control tone, frequency, and alert pattern according to the circuit design.
Key Features
Wide operating voltage range from 1.0V to 24.0V supports flexible circuit design.
Minimum 85dB sound output at 10cm provides clear audible notification performance.
Rated current of 11mA maximum helps reduce power consumption in compact devices.
2500±500Hz rated frequency is suitable for general alarm and signal indication applications.
PPO housing material supports stable mechanical structure and practical product integration.
Lightweight 1.0g design is suitable for small electronic assemblies and space-limited products.
Technical Specifications
| Parameter | Unit | MSPT30D45P20V10 |
| Operating Voltage | V | 1.0–24.0 |
| Rated Current Max | mA | 11mA Max |
| Sound Output at 10cm | dB | Min 85dB Typ. at 10cm, 2kHz |
| Rated Frequency | Hz | 2500±500 |
| Capacitance | pF | 45000±30% |
| Operating Temperature | ℃ | -20 to +70 |
| Storage Temperature | ℃ | -30 to +80 |
| Weight | g | 1.0 |
| Housing Material | - | PPO |
| Packing Condition | - | 2000pcs/box |
Applications
This passive piezo sounder buzzer is suitable for alarm systems, security devices, household appliances, timers, instruments, medical electronics, smart meters, industrial control panels, access control systems, toys, and other electronic products requiring compact audible indication.
It is also suitable for OEM and ODM projects where engineers need a low-current buzzer with controllable sound patterns and stable acoustic output.
Working Principle
A passive piezo buzzer uses a piezoelectric ceramic element to generate sound when driven by an external alternating signal. Unlike an active buzzer, it does not contain a built-in oscillator, so the sound frequency and tone pattern are controlled by the external circuit.
When the drive signal is applied, the piezo ceramic element vibrates and produces audible sound. This structure allows flexible tone design, low power consumption, and compact integration in electronic products.
Design and Integration Notes
For best sound performance, drive the passive buzzer near its rated frequency and ensure the voltage level matches the application requirements. The final sound pressure level may vary depending on housing structure, PCB layout, mounting method, drive waveform, and test distance.
Avoid blocking the sound outlet during product assembly. Proper acoustic cavity design can help improve loudness and maintain consistent alert performance in the final device.
Because this is a passive sounder, an external oscillator or PWM drive signal is required. Confirm the required tone frequency and duty cycle before mass production.
Why Choose This Passive Piezo Buzzer
The MSPT30D45P20V10 passive piezo sounder buzzer offers a practical combination of compact size, low current consumption, wide voltage compatibility, and clear acoustic output. It is suitable for manufacturers looking for a reliable buzzer component for electronic warning and notification systems.
Its lightweight design, PPO housing, and 2000pcs/box packing condition make it convenient for production assembly, procurement planning, and volume manufacturing.
FAQ
What is a passive piezo sounder buzzer?
A passive piezo sounder buzzer is an acoustic component that requires an external drive signal to produce sound. It allows the circuit designer to control the tone frequency, pulse pattern, and alert style.
How is a passive buzzer different from an active buzzer?
An active buzzer has a built-in oscillator and can sound when DC voltage is applied. A passive buzzer does not have a built-in oscillator and must be driven by an external AC signal, PWM signal, or oscillator circuit.
How should I drive this passive piezo buzzer?
Drive the buzzer with an external signal near its rated frequency of 2500±500Hz. The drive voltage should remain within the specified operating range, and the waveform should be selected according to the required sound output.
What applications is this buzzer suitable for?
It is suitable for alarms, timers, home appliances, security products, industrial control devices, medical electronics, smart meters, access control systems, and other products that require audible alerts.
What affects the sound output of a piezo buzzer?
Sound output can be affected by drive voltage, drive frequency, duty cycle, enclosure structure, sound hole design, mounting method, PCB layout, and test distance.
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