STMicroelectronics MP33AB01HTR

Overview

MP33AB01HTR from STMicroelectronics is a bottom-port MEMS silicon microphone with analog output, designed for compact audio capture in space-constrained systems. It delivers 66 dB SNR, -38 dBV sensitivity at 1 kHz, 100 Hz–10 kHz frequency response, and operates from 1.5–3.6 V supply across -30 °C to +100 °C - used in voice-controlled IoT endpoints and portable consumer devices.

For engineers reviewing the MP33AB01HTR datasheet, MP33AB01HTR pinout, MP33AB01HTR application, or MP33AB01HTR equivalent, key selection criteria include acoustic overload point (125 dBSPL), low-power operation (0.25 mA typical), reflow-compatible RHLGA package, and bottom-port mechanical integration requirements.

Technical Context

The MP33AB01HTR integrates a silicon micromachined sensing element with on-chip ASIC for analog signal conditioning. Its single-supply architecture eliminates external biasing, while its omnidirectional response and high bandwidth support wideband voice and audio acquisition.

Electrical interface requires external DC-blocking capacitor (C1 > 1 µF) to set audio path cutoff below 20 Hz; distortion remains <1% THD at 94 dBSPL and rises to 10% THD at acoustic overload (125 dBSPL).

Key Specifications

Pinout & Package

The MP33AB01HTR uses a 6-pin RHLGA (3.76 × 2.95 × 1.0 mm) surface-mount package, optimized for bottom-port acoustic coupling and automated reflow assembly per JEDEC J-STD-020.

Key Features

Applications

Availability

MP33AB01HTR is available at Aetrix Electronics and suitable for voice-controlled IoT endpoints, industrial HMIs, wearable health monitors, and automotive cabin voice assistants requiring stable component supply and long-term manufacturability.

Supply support for MP33AB01HTR 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, delivering intelligent power, sensing, and connectivity solutions for industrial, automotive, and consumer markets.

The MP33AB01HTR belongs to ST's MEMS audio portfolio, engineered specifically for high-fidelity, low-power analog microphone applications in size- and power-constrained edge devices.

FAQ

What is the recommended external capacitor value for the MP33AB01HTR output?

A minimum 1 µF DC-blocking capacitor (C1) is required on the output pin to establish an audio path cutoff frequency well below 20 Hz. With typical interface input resistance of ~20 kΩ, this ensures full-bandwidth voice signal integrity while rejecting DC offset and low-frequency drift.

Does the MP33AB01HTR require a bias voltage or external clock?

No. The MP33AB01HTR is a self-contained analog-output MEMS microphone with integrated ASIC. It operates from a single 1.5–3.6 V supply and requires no external bias network, clock source, or digital interface - simplifying layout and reducing BOM count.

How does the bottom-port design affect PCB layout?

The bottom-port configuration requires an acoustic cavity beneath the PCB - either a cutout in the mounting surface or a dedicated cavity in the enclosure. The RHLGA package exposes the acoustic inlet on the underside, so solder mask must be removed from the corresponding PCB area to avoid blocking sound entry.

Can MP33AB01HTR replace electret condenser microphones (ECMs) in existing designs?

Yes - with minor circuit adjustments. Unlike ECMs, MP33AB01HTR draws current instead of sourcing it, and its output is AC-coupled by default. Replace ECM bias resistors with proper decoupling (C3 = 1 µF at Vdd) and add C1 > 1 µF on output; no change to downstream amplifier gain is typically needed due to matched -38 dBV sensitivity.