MP34DT05-A STMicroelectronics Integrated Circuit (Other) In Stock
STMicroelectronics MP34DT05-A is an ultra-compact omnidirectional digital MEMS microphone with a -26 dBFS sensitivity, PDM output, and 3.6 V maximum supply. It operates across a 64 Hz to 10 kHz audio bandwidth with 61 dB signal-to-noise ratio in a 3.76 x 2.95 mm SMD solder-pad package. Available for voice recognition, smart speakers, and IoT audio capture applications worldwide.
- Manufacturer
- STMicroelectronics
- Package
- Other
- Pin Count
- 8
- Lifecycle
- NOT RECOMMENDED
- Datasheet
- MP34DT05-A Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MP34DT05-A?
- Omnidirectional MEMS capsule with -26 dBFS sensitivity at 1 kHz and 61 dB SNR, delivering clear voice capture across a 64 Hz to 10 kHz frequency range
- Digital PDM (Pulse Density Modulation) output eliminates the need for an external analog-to-digital converter, simplifying the audio chain to a direct MCU or DSP interface
- Ultra-compact 3.76 x 2.95 x 1.10 mm SMD package with solder-pad termination enables integration into the smallest wearable and IoT form factors
- Wide 1.6 V to 3.6 V supply voltage range and low 600 µA current consumption allow direct operation from 3.3 V rails or coin-cell power sources in battery-constrained designs
What is MP34DT05-A used for?
The MP34DT05-A is widely used in smart speakers, TWS earbuds, and voice-activated IoT nodes where an ultra-small MEMS microphone with a digital PDM output must interface directly with an STM32 or similar MCU. Its 61 dB SNR and flat frequency response from 64 Hz to 10 kHz also suit hearing-aid accessories and industrial noise-monitoring modules requiring accurate voice or ambient sound capture. The compact solder-pad footprint enables integration into wristbands and badge-style devices where board area is limited to less than 15 mm².
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the MP34DT05-A datasheet?
MP34DT05-A Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for MP34DT05-A?
Compatible alternatives and drop-in replacements for MP34DT05-A:
suggested
Frequently Asked Questions
What is the signal-to-noise ratio of the MP34DT05-A, and how does it compare to a typical analog MEMS microphone in a noisy environment?
The MP34DT05-A achieves a 61 dB SNR (A-weighted) referenced to 94 dB SPL at 1 kHz. This is on par with mid-tier analog MEMS microphones but removes the noise contribution of an external ADC, which can add 3 dB to 6 dB of quantization noise. In a typical smart-speaker design at 70 dB SPL ambient, the MP34DT05-A's digital PDM output yields a cleaner captured signal than most 16-bit analog microphone plus ADC combinations at equivalent board cost.
Which MCU interface is required to read the PDM output of the MP34DT05-A, and what clock frequency is needed?
The MP34DT05-A uses a single-wire PDM (Pulse Density Modulation) interface requiring a clock input between 1 MHz and 3.25 MHz from the host MCU or DSP. At a 2.4 MHz PDM clock, the output represents an audio sample rate of approximately 48 kHz after decimation. STM32 microcontrollers with a dedicated PDM-to-PCM library (X-CUBE-MEMSMIC1) can directly decimate the 2.4 MHz bitstream to 16-bit PCM at 16 kHz or 48 kHz with no external hardware.
For a wearable voice-recording device running from a 3.0 V coin cell, how does the MP34DT05-A current consumption affect battery life?
The MP34DT05-A draws approximately 600 µA at 3.3 V in normal operating mode, equating to 1.98 mW of power consumption. A CR2032 coin cell with 220 mAh capacity can theoretically power the microphone alone for over 360 hours of continuous recording. In practice, total system current including MCU and wireless IC is higher, but the microphone's low 600 µA draw means it contributes less than 10% of total system power in a typical BLE-based wearable design.
How does the MP34DT05-A SMD solder-pad footprint simplify PCB integration compared with a pin-through-hole condenser microphone?
The 3.76 x 2.95 x 1.10 mm SMD footprint of the MP34DT05-A occupies only about 11 mm² of board area and can be placed by automated pick-and-place equipment in standard reflow processes, eliminating 2 to 4 through-holes and manual soldering steps. A conventional through-hole condenser microphone body typically requires 9 mm x 4 mm of board area and 2 drilled holes per unit. The MP34DT05-A therefore reduces PCB real estate by approximately 35% while enabling fully automated assembly.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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