Active 4Mbit SPI NOR flash for embedded code storage
The AT45DB041E-SSHNHT-T is an active-production 4Mbit SPI NOR flash from Renesas, organized as 264 bytes × 2048 pages. It runs up to 85 MHz on the SPI bus, making it a drop-in for MCU code shadowing or parameter logging in industrial and automotive designs.
85 MHz SPI throughput and page-write timing
At 85 MHz clock, the quad-I/O read sustains roughly 34 MB/s — enough to feed a Cortex-M4 instruction cache without wait-state penalties. The page write cycle is 3 ms typical, and byte/word programming takes 8 µs, so a 264-byte page update completes in about 3 ms total.
SOIC-8 footprint and surface-mount integration
The narrow body keeps the board footprint under 30 mm², suiting space-constrained sensor nodes or motor-drive control boards.