The Texas Instruments SN74S11D is a 3-input AND gate from the S-series TTL logic family. It performs the Boolean AND function on three inputs.
S-series TTL — what the logic family means for your board
The S in SN74S11D stands for Schottky-clamped TTL, which uses Schottky diodes across the transistor base-collector junctions to prevent saturation and reduce propagation delay. The part is RoHS non-compliant.
It remains a standard catalog item for TI's S-series TTL portfolio.