What the 1 x 8:1 configuration means for the signal path
The CD74HCT354E is a single 8-channel multiplexer in the 74HCT logic family, routing one of eight input lines to a common output under digital select control. The 1 x 8:1 circuit means the part handles one data stream at a time — if your BOM needs to scan eight analog or digital signals into a single ADC or GPIO pin, this is the topology. The 4mA sink and source capability at the output is enough to drive a standard CMOS logic input or a low-power LED indicator, but not a heavy bus — plan a buffer if the fan-out exceeds two or three loads.
Through-hole 20-DIP package and board integration
Housed in a 20-pin DIP with 0.300-inch row spacing and 7.62 mm body width, the CD74HCT354E is a through-hole part meant for prototyping, legacy rework, or boards where vibration and thermal cycling favor socketed ICs over surface-mount. The 20-PDIP footprint is a standard 0.100-inch pitch — no layout surprises.
Active production and compliance standing
The 74HCT series is logic-level compatible with TTL inputs and CMOS outputs, so the CD74HCT354E drops into a 5V system without level translation on the select or data lines.