20-pin DIP transceiver for 5V busses
The CD74HCT640E is an 8-bit inverting transceiver from the 74HCT series, with 3-state outputs that let multiple devices share a common data bus without contention. Housed in a 20-pin DIP (0.300" body width), the through-hole package suits prototyping boards, legacy hardware rework, and designs where vibration resistance or manual rework is preferred over surface-mount.
Temperature grade and output drive
Each output sources or sinks 6 mA, enough to drive a standard TTL load or a few LED indicators directly, but not intended for high-current bus transceivers — the 6 mA figure sets the fan-out to downstream CMOS inputs at about 10 loads per line.