STMicroelectronics MP34DT05TR

Overview

MP34DT05TR from STMicroelectronics is an omnidirectional digital MEMS microphone with PDM output, designed for audio capture in space-constrained portable electronics. It delivers –26 dBFS ±3 dB sensitivity, 64 dB(A) signal-to-noise ratio, 122.5 dBSPL acoustic overload point, and operates from 1.6–3.6 V over –40 °C to +85 °C in a 3 × 4 × 1 mm HCLGA package.

For engineers reviewing the MP34DT05TR datasheet, MP34DT05TR pinout, MP34DT05TR application, or MP34DT05TR equivalent, key selection criteria include PDM interface timing compatibility (1.2–3.25 MHz clock), L/R channel selection logic, EMI-shielded top-port mechanical integration, and low-power operation (650 µA typical active current).

Technical Context

The MP34DT05TR integrates a capacitive silicon MEMS sensing element with a dedicated CMOS interface IC to produce a single-bit PDM bitstream synchronized to an external clock. Its L/R pin selects left- or right-channel data alignment on the DOUT line without requiring internal buffering or sample-rate conversion.

It uses a top-port HCLGA package with integrated EMI shielding and a grounded ring terminal, enabling robust acoustic performance in noisy PCB environments. The device supports stereo configurations via time-multiplexed PDM output and requires no external decoupling beyond a 100 nF ceramic capacitor near Vdd.

Key Specifications

Pinout & Package

The MP34DT05TR uses a 4-lead HCLGA (3 × 4 × 1 mm) top-port package with exposed ground ring on bottom side. Mechanical outline conforms to ST's HCLGA specification (DocID029902 Rev 1, Fig. 11), including land pattern dimensions per Figure 12.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS-43432 and INMP522, the MP34DT05TR offers superior SNR and guaranteed AOP performance across temperature, making it optimal for voice AI applications demanding consistent acoustic fidelity in variable thermal and acoustic environments.

Availability

MP34DT05TR is available at Aetrix Electronics and suitable for mobile terminals, laptop audio subsystems, and VR headset development requiring stable component supply, EMI-resilient packaging, and production-ready qualification.

Supply support for MP34DT05TR 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 microcontrollers, sensors, power ICs, and analog/mixed-signal products for industrial, automotive, and consumer markets.

The MP34DT05TR belongs to ST's MEMS audio sensor product line, engineered specifically for ultra-low-power, high-fidelity digital voice capture in portable and wearable electronics with stringent size and EMI constraints.

FAQ

What is the recommended decoupling capacitor for MP34DT05TR?

A 100 nF X7R ceramic capacitor placed within 2 mm of the Vdd pin is required per ST's design recommendations. This minimizes power rail noise that could modulate the PDM clock domain and degrade SNR. Larger bulk capacitance (e.g., 1–10 µF) may be added upstream but does not replace the local 100 nF requirement.

Can MP34DT05TR operate without connecting the LR pin?

Yes - the LR pin has an internal 200 kΩ pull-down resistor to GND, so leaving it unconnected defaults to left-channel mode. However, for deterministic stereo configuration in production, ST recommends explicitly tying LR to Vdd or GND using a 10 kΩ series resistor to prevent floating states during board handling or ESD events.

Is the MP34DT05TR compatible with I²S interfaces?

No - the MP34DT05TR outputs only PDM format and lacks native I²S support. It requires a PDM-capable receiver (e.g., STM32L4+ PDM peripheral, ESP32 I²S + PDM firmware, or dedicated PDM-to-I²S bridge IC) to interface with I²S-only audio processors.

Does the HCLGA package require special reflow profile considerations?

Yes - the MP34DT05TR is MSL Level 3 and must follow JEDEC J-STD-020 Pb-free reflow guidelines: peak temperature ≤260 °C, time above liquidus 60–150 sec, ramp rates ≤3 °C/sec (preheat) and ≤6 °C/sec (cool-down). Exceeding these risks MEMS membrane delamination or solder joint voiding.