16 Mbit SPI DataFlash in a compact 8-UDFN
The AT45DB161E-MHF-Y is a 16 Mbit serial DataFlash from Renesas, organized as 4096 pages of 528 bytes each — the extra 16 bytes per page are the 'buffer' region that makes this family different from a plain SPI NOR flash. The 8-UDFN package with exposed pad (5x6 mm) saves board area compared to the SOIC-8 variants — the thermal pad also pulls heat from the die into the PCB copper, which matters if you are writing pages back-to-back at the 4 ms page-erase cycle.
What the 528-byte page means for firmware design
Each page is 528 bytes, not 512 — the extra 16 bytes are typically used for ECC parity, wear-leveling metadata, or a small header. If your application expects power-of-two sector sizes, the firmware must account for the offset when calculating page addresses. The write cycle time is 8 µs for a single byte and 4 ms for a full page, so streaming audio or data-logging buffers should match the page boundary to avoid read-modify-write overhead. The SPI interface runs at 85 MHz — at that clock rate, a single page read (528 bytes) takes about 50 µs plus command overhead, which is fast enough for code shadowing or parameter storage in a motor drive or sensor hub.
Package footprint and board-fit note
The tray packaging means this variant ships in tubes or trays, not tape-and-reel — if your pick-and-place line expects reel feed, order the AT45DB161E-SSHFHA-T (SOIC-8, tape-and-reel) instead. The die and firmware are identical; only the package and reel format differ.
Active lifecycle and compliance
ROHS3 compliant, with no halogen or lead restrictions beyond the EU directive. No AEC-Q100 grade is stated, so it is not formally qualified for under-hood or mission-critical automotive paths.