64 Mbit NOR Flash for code storage — what the 108 MHz SPI Quad I/O means for the bus
The S25FL164K0XMFIQ11 is a 64 Mbit NOR Flash from the FL1-K series, organized as 8M × 8 bits. It uses an SPI Quad I/O interface clocked at 108 MHz, with a 2.7 V to 3.6 V supply range and an 8-SOIC package.
Industrial temperature range — outdoor and factory-floor fit
The 3 ms page write cycle is typical for NOR — fast enough for OTA firmware staging, but not a candidate for high-frequency data logging.
Obsolete — sourcing reality for the BOM line
No last-time-buy window remains open through the factory channel. There is no official pin-compatible successor listed in the Cypress FL1-K family that carries the same 8-SOIC package and 64 Mbit density — any replacement would require a PCB respin or a software change to a different interface.