155 MHz octal D-type flip-flop in a 20-pin DIP
The SN74AC374N is an octal D-type flip-flop from the 74AC family, clocked at 155 MHz with positive-edge triggering and tri-state non-inverted outputs. It operates across a 2V to 6V supply range and delivers 24 mA of output drive current per channel. Housed in a 20-pin PDIP (0.300" body width), this through-hole package suits breadboard prototyping, legacy socketed designs, or boards where rework access matters more than board density.
Timing and drive margins at 5V
Maximum propagation delay is 9.5 ns at 5V with a 50 pF load, so the data-to-output path settles well within a 6.45 ns clock period at 155 MHz — the limiting factor is the setup/hold window at the receiver, not the flip-flop's own delay. The 24 mA symmetrical source/sink drive at the outputs can directly switch a 5V logic input or a small relay coil through a series resistor, reducing the need for a separate line driver in low-power control paths. Quiescent current is only 4 µA, making this part viable for battery-backed logic sections that must hold state during sleep without draining the rail.