STMicroelectronics MP34DT02TR

Overview

MP34DT02TR from STMicroelectronics is an omnidirectional digital MEMS microphone with PDM output, –26 dBFS sensitivity, 60 dB SNR, and 120 dBSPL acoustic overload point, housed in a top-port HCLGA (3 × 4 × 1.06 mm) package. It operates from –40 °C to +85 °C on single 1.64–3.6 V supply and is used in mobile terminals, VoIP handsets, and speech recognition systems.

For engineers reviewing the MP34DT02TR datasheet, MP34DT02TR pinout, MP34DT02TR application, or MP34DT02TR equivalent, key selection criteria include PDM interface timing, L/R channel selection logic, EMI-shielded top-port mechanical design, and low-power operation at 0.6 mA typical current draw in normal mode.

Technical Context

The MP34DT02TR integrates a capacitive silicon MEMS sensing element with a dedicated CMOS interface IC to deliver a single-bit PDM bitstream synchronized to an external clock (1–3.25 MHz). Its L/R pin selects left- or right-channel data alignment on the DOUT line via high-impedance/data-valid switching per clock edge.

It features A-weighted 60 dB SNR at 1 kHz/1 Pa, –26 dBFS nominal sensitivity (±3 dB), and guaranteed distortion <1% THD+N at 100 dBSPL. The device uses a grounded metal cap for EMI shielding and supports power-down mode with 20 µA quiescent current.

Key Specifications

Pinout & Package

HCLGA (3 × 4 × 1.06 mm), 4-lead top-port surface-mount package with EMI-shielded metal lid, ECOPACK®/RoHS/Green compliant, and JEDEC J-STD-020 qualified for reflow soldering.

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 MP34DT02TR uniquely combines top-port mechanical integration, integrated L/R channel selection, and guaranteed EMI shielding - making it optimal for space-constrained, multi-mic consumer electronics where board-level RF isolation is difficult to achieve.

Availability

MP34DT02TR is available at Aetrix Electronics and suitable for smartphone voice capture, VoIP conference handsets, and industrial speech recognition terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP34DT02TR 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 MP34DT02TR belongs to ST's MEMS audio sensor product line, engineered specifically for high-fidelity, low-power digital voice acquisition in portable and always-on edge devices - emphasizing acoustic accuracy, mechanical robustness, and system-level EMI resilience.

FAQ

What is the recommended clock frequency range for MP34DT02TR in normal operation?

The MP34DT02TR supports a master clock input from 1 MHz to 3.25 MHz in normal mode, with a 40–60% duty cycle requirement. At 2.4 MHz, it delivers standard 1.024 MHz PDM sampling; lower frequencies reduce power but increase quantization noise, while higher frequencies improve oversampling ratio but raise EMI risk near RF bands.

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

When L/R = GND, valid left-channel PDM data appears on DOUT at CLK high; when L/R = Vdd, valid right-channel data appears at CLK low. This phase-alignment enables synchronous stereo capture without external delay matching. The DOUT line goes high-impedance during inactive phases, allowing multiple microphones to share a common data bus.

Is MP34DT02TR compatible with standard SMT reflow profiles?

Yes - the HCLGA package is qualified per JEDEC J-STD-020 for lead-free reflow, with peak temperature ≤260 °C, liquidus time 60–150 sec, and ramp rates ≤3 °C/sec (preheat) and ≤6 °C/sec (cool-down). The metal lid may discolor due to thermal exposure, but this does not affect acoustic or electrical performance.

What mechanical precautions are required during pick-and-place of MP34DT02TR?

Avoid vacuum nozzle contact with the top sound inlet area; use only the defined safe pick zone (1.245 × 0.58 mm, centered on package). Vacuum force must stay below 7 psi (≈48 kPa), and device alignment before pickup is strongly recommended to prevent MEMS membrane damage or misplacement due to package corner radius tolerance (0.25 mm).