CD74HCT166E

Shift Registers Overview

The CD74HCT166E is an 8-bit parallel-in serial-out shift register manufactured by Harris Corporation. It belongs to the HCT logic series, utilizing CMOS technology and housed in a 16-pin PDIP package. The device operates within a supply voltage range of 4.5 V to 5.5 V. It features a propagation delay of 40 ns and supports a maximum frequency of 20 MHz at nominal supply. The component functions as a single circuit with nine input lines and is rated for industrial temperature ranges from -55°C to +125°C.

Shift Registers Feature Summary

• Provides parallel-to-serial data conversion functionality
• Operates using high-speed CMOS HCT logic technology
• Designed for robust performance across wide industrial temperature extremes

Shift Registers Applications

• Data acquisition systems requiring serial output
• Industrial control interfaces
• Communication equipment signal processing

Shift Registers Procurement Notes

Verify manufacturer origin carefully, as historical documentation indicates RCA or Harris production for this specific part number. Confirm RoHS compliance status, as older versions may not meet current environmental standards. Ensure the PDIP-16 package matches your PCB footprint requirements. Cross-reference datasheets to confirm pinout compatibility if substituting from other manufacturers like Texas Instruments.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with parallel load capability is required in an HCT-compatible system. The CMOS construction offers low power consumption relative to TTL equivalents. Verify that the 40 ns propagation delay meets your system timing constraints. Ensure the operating voltage aligns with standard 5V logic levels provided by the HCT family specifications.

Shift Registers Part Context

This component is part of the broader 74HCT logic family, which bridges HC logic speed with TTL voltage compatibility. Similar devices include the CD74HC166E and CD74HCT165E. These parts are commonly used in legacy industrial electronics and educational hardware where reliable serial data shifting is necessary without complex programming overhead.

Shift Registers Replacement Considerations

CD74HC166E: Pin-compatible alternative with HC logic characteristics. CD74HCT165E: Serial-in variant with similar packaging. Verify electrical parameters against original datasheet before substitution.