AND-OR-INVERT gate in LS logic
The 54LS54DMQB is an AND-OR-INVERT gate from the LS (Low-Power Schottky) series, a logic family that balances speed and power for TTL-based designs. It implements the AND-OR-INVERT function — two AND terms feed into a NOR stage — useful for sum-of-products logic without external gating.
That means it sits in a socket or solders into plated through-holes on the PCB. No surface-mount option is listed for this order code, so if your board is SMT-only, you will need a different package variant or a logic-level translator.