STMicroelectronics, a global leader in semiconductor technologies, has unveiled the Stellar P3E, the automotive industry’s first microcontroller to feature built-in AI acceleration for edge intelligence. Developed to support the next generation of software-defined vehicles, Stellar P3E enables the consolidation of multiple functions into X-in-1 Electronic Control Units (ECUs), helping automakers reduce system cost, weight, and overall complexity.
“Stellar P3E sets a new benchmark for automotive electrification by combining high-performance real-time control and edge AI in a single device that meets the highest automotive safety levels,” said Luca Rodeschini, Group Vice President and General Purpose and Automotive Microcontrollers Division General Manager, STMicroelectronics. “Its increased processing power, AI acceleration, large and extensible memory, rich analogue content, smart sensing capabilities, and intelligent power management functions support new applications such as virtual sensors. This better enables automakers with the tools to create safer, more efficient and more responsive driving experiences.”
At the core of the Stellar P3E is STMicroelectronics’ integrated Neural-ART Accelerator, delivering real-time AI processing directly at the edge. This embedded neural network accelerator, powered by a dedicated neural processing unit (NPU) and an advanced data-flow architecture, enables high-efficiency AI workloads. Combined with comprehensive sensing capabilities, the platform supports intelligent sensing applications such as virtual sensors, opening new possibilities for smarter, more responsive vehicle systems.
The Stellar P3E delivers AI inference at microsecond-level speeds, offering up to 30 times greater efficiency than conventional MCU core processing. This performance enables always-on, low-power AI capable of supporting real-time functions such as predictive maintenance and intelligent sensing across a wide range of automotive applications. In electric vehicles, these capabilities can improve charging speed and energy efficiency, while also enabling faster deployment of new features both during production and through in-field updates. By supporting multiple AI models at the MCU level, OEMs can introduce smarter, more intuitive vehicle behaviors while reducing reliance on additional sensors, hardware modules, wiring, and complex system integration.
“Shifting neural processing from centralized hubs to the edge of the vehicle enables sub millisecond-level decision-making, which is essential for the next generation of in-vehicle intelligence. Integrating AI hardware acceleration at the MCU level allows OEMs to deliver advanced capabilities, such as predictive maintenance for vehicle performance and smart sensing with virtual sensor applications. This enables very low latency sensing, actuation control, and other sophisticated features, without the cost and thermal burden of a full-scale SoC,” said Greg Basich, Associate Director, Counterpoint Research.
As the automotive industry embraces the shift towards software-defined vehicles (SDVs), Stellar P3E’s integrated xMemory, ST’s proprietary non-volatile memory based on phase-change memory (PCM), provides the essential scalability and flexibility needed. Offering twice the density of traditional embedded flash memory and qualified for automotive environments, this extensible memory solution enables dynamic expansion of software storage to accommodate new features and updates without requiring any hardware redesign.
The P3E is fully supported within the ST Edge AI Suite, a comprehensive edge-AI ecosystem that spans from dataset creation to on-device deployment for data scientists and embedded engineers. As part of this suite, NanoEdge AI Studio tool is now available for the entire Stellar MCU family. In addition, the Stellar P3E is already integrated into Stellar Studio, ST’s all-in-one development environment tailored for automotive engineers. Together they reinforce a robust hardware and software ecosystem designed to streamline the deployment of sophisticated edge AI solutions in demanding automotive environments.
The start of production of the Stellar P3E is planned in the fourth quarter of 2026.
Key technical highlights:
• 500 MHz Arm Cortex-R52+ cores delivering the highest CoreMark score in its class – exceeding 8,000 points;
• Split-lock architecture enabling designers to optimize the balance between functional safety and peak performance;
• Open Arm architecture, leveraging a vast global developer community for accelerated innovation;
• Rich I/O and analog capabilities support diverse functions, including advanced motor control for enhanced vehicle dynamics.
