What this 64 Mbit NOR Flash brings to the board
The Infineon S25FL064LABMFI011 is a 64 Mbit serial NOR Flash from the FL-L family, organized as 8M x 8 bits. It speaks SPI with Quad I/O and QPI protocol support, clocked up to 108 MHz. That Quad-SPI interface means the host MCU can fetch code or log data at roughly four times the throughput of a single-bit SPI part, without adding extra pins beyond the standard four-wire bus.
108 MHz Quad-SPI — what the clock rate means for the bus
At 108 MHz in Quad I/O mode, the part delivers a sustained read throughput that keeps a Cortex-M or RISC-V core fed without wait-state bottlenecks on the flash side. The QPI mode (Quad Peripheral Interface) reduces command overhead by encoding opcodes on four I/O lines, which improves random-read efficiency compared to legacy SPI. If your MCU supports Quad-SPI with DDR (double data rate), the 108 MHz clock effectively doubles the data rate on the bus — but the part's interface is single-data-rate, so the throughput ceiling is 54 MB/s in Quad I/O. That is still well above what a 48 MHz single-SPI bus can manage (~6 MB/s).
Active lifecycle — no imminent LTB pressure
The FL-L series is a current-generation family, so firmware and layout investment here will not be stranded by a sudden discontinuation.
Package and footprint — 8-SOIC with 5.30 mm width
The 8-SOIC package (0.209", 5.30 mm width) is the wider-body SOIC variant. This footprint is shared with many other 8-pin serial NOR Flash parts.
Because the part is active and widely used, multi-source coverage is generally good across the broker and surplus market — but as with any serial NOR Flash, date-code freshness and traceability matter. A quote request should specify the required date-code window to avoid aging inventory that may have drifted off the manufacturer's guaranteed retention spec.