16 MHz Cortex-M0 in an 8-pin SOIC — the part for a single-task control loop
The Infineon CY8C4014SXI-420T is a PSOC® 4 CY8C4000 series 32-bit ARM® Cortex®-M0 MCU clocked at 16 MHz, with 16 KB Flash and 2K x 8 RAM. The wide supply range of 1.71V to 5.5V lets it run directly from a lithium cell or a 5V rail without an external regulator.
Memory and I/O — keep the firmware lean
16 KB Flash and 2 KB RAM are tight. This part is sized for a single control loop, a few configuration parameters, and a small state machine. There is no room for a full RTOS or large data buffers. The 5 I/O pins and single I²C interface mean you are connecting one or two sensors or a simple display — not a multi-peripheral system. Brown-out detect, POR, PWM, and WDT are on-chip, so external supervisor ICs are not needed.
No last-time-buy notice or obsolescence risk. ROHS3 compliant. No need to stockpile or hunt surplus.
Package and supply — fits a 5V or battery-powered board
8-SOIC (0.154", 3.90mm width) surface-mount package. The 1.71V to 5.5V supply range means it can run from a 3.3V LDO, a 5V logic rail, or a 2-cell alkaline battery stack. Mounting is surface-mount only — no through-hole option.