The SN74AC14D is a Hex Schmitt-trigger Inverter contains six independent circuits. This device performs the Boolean function Y = A\. Because of the Schmitt action, they have different input threshold levels for positive-going (VT+) and for negative-going (VT-) signals. The circuits are temperature compensated and can be triggered from the slowest of input ramps and still give clean, jitter-free output signals. This device also has a greater noise margin than conventional inverters.

Package: SOIC

Link to datasheet:: https://uk.farnell.com/texas-instruments/sn74ac14d/ic-schmitt-trigger-smd-74ac14/dp/9590234