STM32C551MCT6

STM32C551MCT6 is a mainstream 32-bit microcontroller from STMicroelectronics in an LQFP-80 package, built on an Arm Cortex-M33 core with FPU and DSP instructions at 144 MHz, with 512 KB of dual-bank Flash and 128 KB of SRAM, an I3C port, two 12-bit ADCs reaching 4.5 MSPS interleaved and USB 2.0 full-speed. The C5 generation is the selection point for designs stepping up from G0/G4-class parts: TrustZone-era Cortex-M33 performance and dual-bank Flash for live firmware updates, on a 2.7 to 3.6 V supply - note that floor, which is higher than the 1.7 V of the G0/G4 families. The 80-pin package is the middle option of the family, exposing more I/O than the 48-pin codes without the board area of the 100-pin version. Selection advice: FDCAN is only on the STM32C552, not this 551, so designs needing CAN FD should order a 552 code; ST announced the STM32C5 series entering production in March 2026 and the eStore lists this code as Active, so match the full STM32C551MCT6 code when ordering. Parameters verified against STMicroelectronics documentation.