128 Mbit NOR Flash in a 24-ball BGA — what the package means for assembly
The reflow profile needs careful control, and the joints should get X-ray inspection after assembly. Moisture sensitivity is typical for this class; if the sealed bag has been open beyond the floor-life window, a bake before reflow is required.
66 MHz Quad-SPI — real-world throughput for firmware storage
At 66 MHz in Quad I/O mode, the S25FL128LDPBHI023 can sustain read throughput high enough for execute-in-place (XIP) boot from a moderate-speed host MCU or SoC. The 128 Mbit density gives room for a main application image plus an OTA staging area, with the 4 KB and 64 KB erase granularity typical of NOR Flash. The SPI - Quad I/O interface keeps pin count low — four data lines plus clock and chip select — which simplifies PCB routing compared to parallel NOR.
The base product number S25FL128 covers a family of density and package variants; if a pin-compatible second source is needed, the FL-L series is a single-sourced Infineon line, so plan for sole-source risk in your BOM.