STMicroelectronics MP34DB01

Overview

MP34DB01 from STMicroelectronics is an omnidirectional, bottom-port MEMS audio sensor with digital PDM output, designed for low-power voice capture in compact consumer and IoT devices. It features a signal-to-noise ratio of 64 dB(A), -26 dBFS sensitivity, and operates from 1.64 V to 3.6 V with typical current consumption of 170 µA in active mode.

For engineers reviewing the MP34DB01 datasheet, MP34DB01 pinout, MP34DB01 application, or MP34DB01 equivalent, key selection criteria include its PDM interface compatibility with microcontrollers lacking I²S peripherals, its AEC/NS-ready acoustic performance, and its robustness against PCB-level mechanical stress and soldering thermal shock.

Technical Context

The MP34DB01 integrates a capacitive sensing element and a low-noise CMOS interface ASIC on a single die, with on-chip voltage regulation enabling stable operation across wide supply ranges. Its digital PDM output eliminates external ADC requirements and simplifies routing by reducing analog-sensitive traces.

It employs a high-pass filter with cutoff at 50 Hz (typ.) to suppress wind noise and handling artifacts, and supports daisy-chain configuration via shared clock and data lines-enabling multi-mic array synchronization without additional timing controllers.

Key Specifications

Pinout & Package

MP34DB01 is housed in a 3.5 mm × 2.65 mm × 0.98 mm LGA-6 package with bottom acoustic port and exposed ground pad for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar MEMS microphone applications.

Compared with ICS-43432 and INMP522, MP34DB01 delivers superior SNR in a digitally integrated form factor, reduces layout sensitivity through PDM output and built-in filtering, and lowers total power in always-listening configurations-making it optimal for next-generation compact, battery-constrained voice interfaces.

Availability

MP34DB01 is available at Aetrix Electronics and suitable for voice-controlled smart speakers, wearable fitness trackers, industrial HMIs, and smart home security cameras requiring stable component supply and long-term manufacturability.

Supply support for MP34DB01 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The MP34DB01 belongs to ST's MEMS Microphone portfolio, engineered specifically for ultra-low-power, high-fidelity digital audio capture in space- and energy-constrained edge devices.

FAQ

What is the recommended PCB layout for MP34DB01 to maintain acoustic performance?

Place the microphone centered on a dedicated acoustic cavity with minimum 0.5 mm clearance to adjacent components. Route VDD and GND with wide traces and place a 1 µF ceramic decoupling capacitor within 2 mm of VDD/GND pins. Keep CLK and DATA traces short, matched in length, and routed away from noisy digital signals to prevent jitter-induced SNR degradation.

Does MP34DB01 require external clock conditioning or termination resistors?

No external clock conditioning is required-the device accepts clean CMOS-level CLK signals up to 3.25 MHz. A 10 kΩ pull-up resistor on DATA is recommended for reliable open-drain operation, but no series termination is needed due to its low-output-drive architecture and short trace compatibility.

Can MP34DB01 be used in stereo or multi-microphone arrays?

Yes-MP34DB01 supports daisy-chain configuration using a shared CLK line and individual DATA lines, or synchronous parallel readout with separate CLK lines. Its tight gain matching (±3 dB sensitivity tolerance) and low inter-device phase mismatch (<1° at 1 kHz) enable accurate beamforming and spatial audio processing.

How does the built-in high-pass filter affect voiceband signal integrity?

The on-chip 50 Hz high-pass filter attenuates subsonic noise (e.g., wind, handling vibration) while preserving speech intelligibility down to 100 Hz. It introduces no phase distortion in the 300–3400 Hz telephony band and maintains flat group delay-ensuring natural-sounding voice capture without post-processing compensation.