Description:

Lot of 5 Texas Instruments SN74LS243N (74LS243) TTL logic ICs in PDIP-14. The 74LS243 is an octal bus transceiver with non-inverting 3-state outputs, commonly used to buffer and isolate 8-bit data buses between CPUs, memory, and peripheral boards. Great for vintage computer/arcade/industrial PCB repair and general 5V digital bus interfacing where you need clean bus drive and tri-state capability.

Modern uses:

- 8-bit bus buffering/isolation between microcontrollers, memory, and peripherals

- Retro computer / arcade / industrial control board repair (LS TTL logic)

- Level-compatible bus interface in 5V systems (non-inverting transceiver)

- Prototyping: add tri-state bus control for shared data lines

Compatibility note:

Confirm your design calls for **74LS243** (octal bus transceiver, PDIP-14) and that the **enable/control pins** match your schematic (tri-state bus behavior). Works in 5V TTL systems; substitutions like 74ALS243/74F243/74HCT243 may be possible, but verify input thresholds, speed, and loading/fanout before swapping.