256 Mbit SPI NOR flash in a 24-BGA package
The S25FL256SDPBHVC03 is a 256 Mbit NOR flash memory from Infineon's FL-S series, organized as 32M x 8 bits and accessed over a SPI Quad I/O interface at up to 66 MHz. Housed in a 24-ball TBGA (8 mm x 6 mm body), the package suits space-constrained designs where a 0.80 mm ball pitch keeps the fan-out achievable on a standard 4-layer PCB.
What the clock rate and interface mean for read throughput
The 66 MHz clock frequency applies to the SPI bus in Quad I/O mode — four data lines transfer simultaneously, so the raw read throughput reaches roughly 264 Mbit/s before controller overhead. Quad I/O eliminates the need for separate address and data cycles on the same pins; the host sends the command once and the flash drives data on all four I/O lines for the remainder of the burst. For a firmware-over-the-air update or a boot-loader that copies 256 Mbit into RAM, the sustained read rate is the bottleneck — this part keeps the bus busy at the full 66 MHz rate without wait states once the initial access latency is paid.
No official successor or pin-compatible cross-reference is recorded — the FL-S series is the current generation, and this order code is the active variant for the 24-BGA package at the industrial temperature range.