STMicroelectronics MP45DT02

Overview

MP45DT02 from STMicroelectronics is a top-port, omnidirectional digital MEMS microphone with PDM single-bit output, 120 dBSPL acoustic overload point, 61 dB SNR, and -26 dBFS sensitivity. It integrates a silicon micromachined sensing element and CMOS interface IC in an HLGA-6 package, designed for stereo audio capture in space-constrained portable computing and voice-enabled devices.

For engineers reviewing the MP45DT02 datasheet, MP45DT02 pinout, MP45DT02 application, or MP45DT02 equivalent, key selection criteria include its PDM output timing (1–3.25 MHz clock), low-power operation (0.65 mA active, 20 µA power-down), extended temperature range (-30 °C to +85 °C), and dual-package option (metal/plastic HLGA).

Technical Context

The MP45DT02 implements a dedicated CMOS interface IC that converts analog acoustic signals from its silicon micromachined sensing element into a synchronous PDM bitstream. Its L/R pin enables hardware-selectable left/right channel assignment without external configuration registers.

It operates with a 1.64–3.6 V supply and requires no external biasing or ADC; the PDM output directly interfaces with digital audio processors supporting I²S-to-PDM conversion or native PDM input. Wake-up time is guaranteed at 10 ms from first clock edge to valid data.

Key Specifications

Pinout & Package

MP45DT02 uses an HLGA-6 surface-mount package (4.72 mm × 3.76 mm × 1.25 mm) with exposed metal or plastic top cap. The package is JEDEC J-STD-020-compliant for lead-free reflow and features a standardized landing pattern for automated assembly.

Key Features

Applications

Availability

MP45DT02 is available at Aetrix Electronics and suitable for laptop audio subsystems, VoIP endpoint designs, and voice-controlled security systems requiring stable component supply across long production lifecycles.

Supply support for MP45DT02 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 MP45DT02 belongs to ST's MEMS audio sensor product line, engineered specifically for high-SNR, low-power digital voice capture in portable and embedded systems where size, power, and acoustic fidelity are critical.

FAQ

What is the recommended power supply decoupling for MP45DT02?

ST specifies a 100 nF ceramic capacitor and a 10 µF ceramic capacitor placed as close as possible to pin 6 (Vdd). This dual-capacitor network suppresses high-frequency switching noise and low-frequency supply droop, ensuring stable PDM output integrity and minimizing PSR-related distortion.

How does the L/R pin configure stereo output?

The L/R pin selects which channel's PDM data appears on DOUT during each CLK half-cycle: when L/R = GND, left-channel data is valid on CLK high; when L/R = Vdd, right-channel data is valid on CLK high. This hardware-based selection avoids firmware overhead and timing jitter from software-controlled switching.

Can MP45DT02 operate with a 3.3 V supply?

Yes - MP45DT02 supports Vdd from 1.64 V to 3.6 V. At 3.3 V, it maintains full specification compliance including 61 dB SNR and 120 dBSPL AOP. Current consumption increases slightly to ~0.72 mA, but remains within safe thermal limits for the HLGA package.

Is there a difference between MP45DT02 and MP45DT02TR packaging?

MP45DT02 is supplied in trays; MP45DT02TR is tape-and-reel packaged for automated SMT assembly. Both share identical electrical, acoustic, and mechanical specifications. The "-M" suffix (MP45DT02TR-M) denotes the metal-cap variant, while standard MP45DT02/TR use plastic caps - both are functionally interchangeable.