STMicroelectronics MP33AB01H

Overview

MP33AB01H from STMicroelectronics is a bottom-port MEMS silicon microphone with analog output, designed for compact audio capture in space-constrained devices. It delivers 66 dB SNR, -38 dBV sensitivity at 1 kHz, and operates across -30 °C to +100 °C with 0.25 mA typical current draw at 2.2 V supply - used in voice-enabled IoT sensors and portable consumer electronics.

For engineers reviewing the MP33AB01H datasheet, MP33AB01H pinout, MP33AB01H application, or MP33AB01H equivalent, key selection criteria include acoustic overload point (125 dBSPL), frequency response (100 Hz–10 kHz), reflow-compatible RHLGA package, and DC-blocking capacitor design guidance for analog interface stability.

Technical Context

The MP33AB01H integrates a silicon micromachined sensing element with on-chip signal conditioning, delivering analog output without external biasing circuitry. Its single-supply operation (1.5–3.6 V) and low quiescent current enable direct integration into battery-powered systems.

It features omnidirectional acoustic response, high bandwidth up to 10 kHz, and robust mechanical design qualified for JEDEC J-STD-020 reflow profiles. The device exhibits <1% THD at 94 dBSPL and 10% THD (typ.) at 125 dBSPL, supporting wide dynamic range audio capture.

Key Specifications

Pinout & Package

The MP33AB01H uses an RHLGA (3.76 × 2.95 × 1.0 mm) surface-mount package, qualified for lead-free reflow soldering per JEDEC J-STD-020 and compliant with RoHS and ECOPACK® environmental standards.

Key Features

Applications

Availability

MP33AB01H is available at Aetrix Electronics and suitable for voice interface modules, industrial condition-monitoring sensors, and automotive cabin audio subsystems requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for MP33AB01H 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 MP33AB01H belongs to ST's MEMS microphone product line, engineered specifically for high-SNR, low-power, and miniature analog audio sensing in resource-constrained edge devices.

FAQ

What is the required external DC-blocking capacitor value for MP33AB01H?

A minimum 1 µF capacitor is recommended on the output pin (Pin 1) when interfacing with a typical 20 kΩ input resistance stage. This sets the audio high-pass cutoff well below 20 Hz, preserving full speech spectrum while blocking DC offset. Ceramic X7R types are preferred for stability and size.

Does MP33AB01H require a bias voltage or external clock?

No. The MP33AB01H is a self-contained analog-output MEMS microphone requiring only a single DC supply (1.5–3.6 V) on Pin 4 (Vdd). It contains integrated oscillator and amplifier circuitry - no external clock, bias resistor, or active components are needed for basic operation.

Can MP33AB01H be used in waterproof or dustproof enclosures?

Yes - its bottom-port configuration allows mounting directly onto a PCB with the acoustic inlet aligned to a sealed gasket or membrane on the enclosure underside. The RHLGA package is moisture-resistant, and the device has passed reliability testing under JEDEC MSL3 conditions when properly assembled.

How does MP33AB01H compare to electret condenser microphones (ECMs)?

Unlike ECMs, MP33AB01H offers superior temperature stability (-30 °C to +100 °C), lower power (0.25 mA vs. ~0.5 mA), higher SNR (66 dB vs. typically 58–62 dB), and immunity to humidity-induced drift. It also eliminates the need for external JFET biasing and provides consistent performance across mass production.