Dual monostable multivibrator in 16-pin SOIC
The SN74LS221NS is a dual monostable multivibrator from Texas Instruments in a 16-pin SOIC package — the standard small-outline footprint for this logic family, so it places cleanly on a two-layer board without fanout issues. It belongs to the LS (Low-Power Schottky) series, which balances speed and power draw for timing and pulse-generation circuits in industrial control and instrumentation.
The part ships in bulk packaging, which suits high-volume pick-and-place lines as well as low-volume prototype builds without reel premium.