The AURIX TC3xx microcontroller family from Infineon Technologies AG - safety-focused classic for cars and industry

Reviewed: ad hoc news Classics & Longseller desk. Edited and checked on 2026-06-28, 23:21. Details in the imprint.

The AURIX TC3xx microcontroller family from Infineon Technologies AG sits buried deep under dashboards and inside control cabinets, quietly deciding when brakes bite, pumps spin and relays click. You never see it, but its split-second decisions can be felt in every safe stop.

What AURIX TC3xx is built for

Infineon’s AURIX TC3xx family is a 32-bit multicore microcontroller line designed for demanding automotive and industrial applications that require high functional safety up to ASIL-D and robust real-time control. This includes powertrain, chassis, domain and zone controllers, e-mobility inverters and industrial drives. Infineon’s official product overview describes TC3xx as its second-generation AURIX platform with enhanced performance and connectivity.

At the heart of many TC3xx devices are up to six TriCore CPU cores, some arranged in lockstep for safety, running at frequencies typically up to 300 MHz depending on the variant, and supported by integrated flash memory up to several megabytes and extensive on-chip SRAM. This architecture lets one package combine safety-critical control with general application processing, reducing the need for separate controllers in complex ECUs.

How it feels in real use

Engineers who handle evaluation boards with TC3xx chips describe the haptic impression very clearly: a compact QFP or BGA package sitting on a densely populated PCB that warms slightly under load, while the connected motor quietly ramps up and down without jitter thanks to deterministic response. The user does not interact with the microcontroller directly, but hears the smooth spin of a pump or the clean clack of contactors reacting without delay.

Markus Heyn, member of the Bosch management board responsible for mobility, has referred in public presentations to multi-core automotive microcontrollers like AURIX as foundational components for modern braking and driver-assistance systems, underlining why Tier 1 suppliers qualify such chips for long lifetimes and consistent behavior over wide temperature ranges. That expectation shapes how TC3xx is specified, packaged and tested.

Safety, security and connectivity

AURIX TC3xx devices integrate multi-level safety concepts including lockstep cores, redundant peripherals and safety management units aimed at ISO 26262 functional safety up to ASIL-D, which is required for critical systems like electric power steering or braking. This helps Tier 1 suppliers design ECUs that can meet stringent OEM safety goals with fewer external components. An Infineon safety manual and related documentation highlight how safety mechanisms are built into the silicon.

Beyond safety, TC3xx includes hardware security modules supporting features such as secure boot, accelerated cryptography and key storage, enabling protection against tampering and secure over-the-air software updates in connected vehicles and industrial installations. Communication options typically cover high-speed CAN FD, FlexRay on some variants, multiple LIN interfaces and Gigabit Ethernet, plus specialized interfaces for motor control and sensors.

Where it shows its age and where it fits

Because TC3xx is a long-running platform, its CPU performance and process technology do not match the newest automotive system-on-chips aimed at heavy AI workloads or high-end infotainment. For power-hungry perception stacks, OEMs increasingly combine AURIX-type safety MCUs with dedicated AI accelerators or domain controllers rather than relying on a single chip to do everything.

However, that trade-off is intentional: AURIX TC3xx is positioned as a reliable, predictable workhorse for control and safety functions with long-term availability. Many carmakers and industrial customers value a microcontroller family that stays in the market for well over a decade, with consistent behavior across revisions and drop-in compatible derivatives, which eases platform design and maintenance.

Context and share listing

Infineon Technologies builds AURIX TC3xx at the intersection of its automotive and industrial business, two segments that management under CEO Jochen Hanebeck regularly highlights as growth drivers in presentations and capital-markets days. For investors, the automotive MCU franchise contributes to revenue stability and content growth per vehicle.

Infineon Technologies shares (ISIN DE0006231004) trade on Xetra in euros as part of Germany’s DAX index, giving European investors a liquid way to participate in demand for automotive and industrial semiconductors.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.