The Texas Instruments SNJ54LS374FK is an octal D-type edge-triggered flip-flop from the 54LS logic family. It captures data on the rising edge of the clock and holds it until the next clock transition, with a three-state output for bus-oriented systems.
What the pinout and package mean for your board
The SNJ54LS374FK uses a 20-lead ceramic LCC (FK suffix) — a hermetic, surface-mount package common on military and space-grade logic. The pinout follows the standard 54LS374: eight D inputs (D0–D7), eight Q outputs (Q0–Q7), a clock input (CP), an output enable (OE), and VCC/GND. The three-state outputs share a single OE line; when OE is high, outputs go high-impedance, allowing multiple devices on the same data bus. The ceramic package handles the thermal cycling and moisture resistance required for unsealed or conformally coated assemblies.