Murata PKMCS0909E4000-R1 SMT Piezoelectric Sounder Beeper (4kHz, 65dB, 9x9mm)

Add clean acoustic notifications and alerts to your space-constrained electronic hardware with the genuine PKMCS0909E4000-R1 surface-mount piezoelectric sounder from Murata. Featuring an ultra-compact 9.0 x 9.0 mm footprint with a low height profile of just $1.7\text{ mm}$, this ceramic buzzer generates a clear 4.0 kHz resonant tone at a sound pressure level (SPL) of 65 dB (at $10\text{ cm}$).

Designed without internal drive circuitry (externally driven piezo sounder), it operates seamlessly with standard microcontroller PWM signal outputs (e.g., Arduino, ESP32, STM32) using minimal power consumption and creating zero electromagnetic interference (EMI). Its reflow-solderable SMD housing is ideal for compact wearable tech, medical monitors, smart home sensors, handheld meters, and wireless IoT devices requiring audible user feedback.

Key Features:

• 4.0 kHz Resonant Frequency: Produces a sharp, high-pitch acoustic tone easily audible in noisy ambient environments.

• Ultra-Compact 9x9mm Footprint: Slim $1.7\text{ mm}$ height saves critical vertical enclosure space.

• Low Power Consumption: Piezoelectric design draws minimal current, making it perfect for battery-powered devices.

• Zero EMI Generation: Solid-state ceramic structure produces no magnetic field or RF interference.

Specifications:

• Part Number: PKMCS0909E4000-R1

• Manufacturer: Murata Electronics

• Component Type: Piezoelectric Sounder / External Drive Buzzer

• Resonant Frequency: 4.0 kHz

• Sound Pressure Level (SPL): $\ge 65\text{ dB}$ (at $3\text{Vp-p}$, $4\text{kHz}$, $10\text{ cm}$)

• Operating Voltage: Up to $25\text{ Vp-p}$ max

• Dimensions: $9.0\text{ mm} \times 9.0\text{ mm} \times 1.7\text{ mm}$

• Mounting Type: Surface Mount (SMD / SMT)