STMicroelectronics MP34DB01TR

Overview

MP34DB01TR from STMicroelectronics is an omnidirectional, bottom-ported MEMS audio sensor with digital PDM output, designed for high-SNR voice capture in space-constrained applications. It delivers 64 dB signal-to-noise ratio (SNR), -26 dBFS sensitivity, and operates from 1.64 V to 3.6 V supply, supporting sampling rates up to 96 kHz. It is used in smartphone voice assistants, IoT voice remotes, and compact conferencing devices.

For engineers reviewing the MP34DB01TR datasheet, MP34DB01TR pinout, MP34DB01TR application, or MP34DB01TR equivalent, key selection criteria include its PDM interface compatibility, acoustic performance at low power (570 µA typical), mechanical robustness (75 g shock resistance), and AEC-Q100 Grade 3 qualification for extended temperature operation (-40 °C to +85 °C).

Technical Context

This MEMS microphone integrates a capacitive sensing element with a low-power ASIC that performs analog-to-digital conversion and outputs a single-bit PDM stream synchronized to an external clock. Its differential architecture suppresses RF interference and substrate noise, enabling reliable operation in noisy PCB environments.

The device features built-in high-pass filtering (15 Hz cutoff) to reject wind and handling noise, and supports daisy-chaining of multiple PDM microphones on a shared clock line-critical for beamforming arrays in smart speakers and hearing aids.

Key Specifications

Pinout & Package

MP34DB01TR is housed in a 3.75 mm × 3.00 mm × 1.10 mm LGA-6 package with bottom porting. The package is RoHS-compliant, halogen-free, and optimized for automated SMT placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS-43432 and INMP522, MP34DB01TR offers superior SNR-to-power ratio and automotive qualification without increasing board area-making it optimal for next-generation voice-enabled edge devices where acoustic fidelity and reliability are co-prioritized.

Availability

MP34DB01TR is available at Aetrix Electronics and suitable for smartphone voice assistants, IoT voice remotes, and compact conferencing devices requiring stable component supply and long-term manufacturability.

Supply support for MP34DB01TR 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 products for automotive, industrial, and consumer markets with emphasis on energy efficiency and system integration.

The MP34DB01TR belongs to ST's MP-series MEMS microphone portfolio, engineered specifically for high-fidelity, low-power digital voice capture in space- and power-constrained edge devices.

FAQ

What is the recommended PCB layout for MP34DB01TR to ensure optimal acoustic performance?

Place the microphone over a dedicated back cavity ≥1.0 mm³ with no copper or vias beneath the port opening. Use a 100 nF ceramic decoupling capacitor within 2 mm of VDD/GND pads, and route CLK and DATA with controlled impedance (50 Ω) and minimum stub length. Keep the bottom port unobstructed and avoid solder mask over the acoustic vent.

Does MP34DB01TR require external clock conditioning or termination?

No external clock conditioning is required. The CLK input accepts a clean CMOS-level square wave (1–3.25 MHz); a series 33 Ω resistor placed close to the CLK pin reduces ringing. No termination is needed on the DATA line beyond the recommended 100 Ω series resistor near the microphone output.

Can MP34DB01TR be used in waterproof or dustproof enclosures?

Yes-its bottom-port design allows integration behind IP-rated membranes or gaskets. ST recommends using hydrophobic, acoustically transparent meshes (e.g., Gore Membrane) with ≤1.5 dB insertion loss at 1 kHz. Avoid sealing the port completely; maintain acoustic path integrity through vented enclosures.

Is there factory calibration data available for individual MP34DB01TR units?

No unit-level calibration data is provided. Sensitivity is trimmed during wafer test to ±3 dB tolerance, and all units meet the -26 dBFS ±3 dB specification. System-level calibration (e.g., gain matching in multi-mic arrays) must be performed in final application firmware using known acoustic stimuli.