64-bit FIFO in a 16-pin DIP
The CD74HCT40105E is a 74HCT-series asynchronous FIFO register organized as 16 words by 4 bits, giving 64 bits of buffering in a 16-DIP through-hole package.
Temperature grade and board-fit
The 16-DIP (0.300", 7.62mm) body and 16-PDIP supplier package mean it fits legacy through-hole boards and prototyping sockets without a footprint change.
Expansion and bus direction
The device supports depth and width expansion, so multiple CD74HCT40105E parts can cascade to build larger FIFO arrays. Bus direction is uni-directional — data flows one way through the register. It does not support FWFT (First-Word Fall-Through), programmable flags, or retransmit capability; the control logic is straightforward for simple buffering applications.