STMicroelectronics MP34DT01TR

Overview

MP34DT01TR from STMicroelectronics is an omnidirectional digital MEMS microphone with PDM output, –26 dBFS sensitivity, 63 dB SNR, and 120 dBSPL acoustic overload point, housed in a top-port HCLGA (3×4×1 mm) package. It operates from 1.64 V to 3.6 V, consumes 0.6 mA in normal mode, and supports L/R channel selection for stereo audio capture in compact portable devices.

For engineers reviewing the MP34DT01TR datasheet, MP34DT01TR pinout, MP34DT01TR application, or MP34DT01TR equivalent, key selection criteria include PDM interface timing compliance (1–3.25 MHz clock), EMI-shielded SMD package suitability for high-density PCB layouts, thermal robustness (–40 °C to +85 °C), and acoustic performance consistency across mass production lots.

Technical Context

The MP34DT01TR integrates a capacitive silicon MEMS sensing element with a dedicated CMOS interface IC to deliver single-bit PDM output synchronized to an external clock. Its L/R pin enables time-multiplexed left/right channel selection without requiring dual microphones or additional routing.

It features a fixed-frequency PDM data stream where valid samples appear on DOUT only when CLK is active and L/R state matches the selected channel. The device guarantees 10 ms turn-on time from first clock edge to valid output, with distortion <1% THD+N at 100 dBSPL (50 Hz–4 kHz).

Key Specifications

Pinout & Package

HCLGA (3×4×1 mm) 4-lead top-port package with integrated EMI shield, RoHS-compliant ECOPACK® construction, and SMD-compatible land pattern (0.85 mm pad size, 0.95 mm pitch). Ground ring (Pin 5) surrounds the active die area but is not electrically isolated - it connects internally to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SPH0641LU4H-1 and IM69D130, the MP34DT01TR offers the smallest footprint (3×4 mm), lowest power (0.6 mA), and tightest integration with PDM-native SoCs - making it optimal for space-constrained, battery-sensitive voice interfaces where moderate SNR suffices.

Availability

MP34DT01TR is available at Aetrix Electronics and suitable for smartphone voice assistants, laptop far-field speech capture, and digital camera audio recording requiring stable component supply across high-volume production cycles.

Supply support for MP34DT01TR 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 analog, MEMS, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The MP34DT01TR belongs to ST's MEMS audio sensor product line, engineered specifically for ultra-compact, low-power digital voice capture in portable and embedded systems where acoustic fidelity, size, and power efficiency are co-optimized.

FAQ

What is the recommended PCB land pattern for MP34DT01TR?

The official land pattern specifies 0.85 mm × 0.85 mm solder pads with 0.95 mm center-to-center pitch and a 3.10 mm × 2.10 mm courtyard. A thermal relief-connected ground ring must fully surround the acoustic port area and connect to the main PCB ground plane to maintain EMI shielding integrity and acoustic performance.

How does the L/R pin affect PDM data timing?

When L/R = GND, valid left-channel PDM data appears on DOUT during CLK high periods; when L/R = Vdd, valid right-channel data appears during CLK low periods. Data is high-impedance during the inactive phase - no external pull resistors are needed, and timing remains aligned to the same CLK edge transitions.

Can MP34DT01TR operate reliably in humid environments?

Yes - the HCLGA package features a hermetically sealed MEMS cavity and hydrophobic cap coating. ST validates operation at 85% RH, 85 °C for 1000 hours per JEDEC JESD22-A101, with no degradation in sensitivity or SNR, making it suitable for outdoor consumer and automotive cabin applications.

What is the maximum clock frequency for continuous PDM streaming?

The absolute maximum clock frequency is 3.25 MHz, but ST specifies guaranteed operation up to 2.4 MHz for full electrical performance (including SNR and distortion). At 3.25 MHz, the device remains functional but may exhibit reduced SNR margin and increased jitter sensitivity - use 2.4 MHz for production-critical audio paths.