74LS166AP-E

Overview

The 74LS166AP-E is an 8-bit parallel-in, serial-out shift register manufactured by Renesas Electronics Corporation. It operates within a standard logic family and features buffered inputs to reduce drive requirements. The device integrates input clamping diodes to minimize switching transients and simplify system design. Key control functions include gated clock inputs and an overriding clear input. The architecture supports both parallel-load and serial-shift modes via a dedicated shift/load control pin.

Feature Summary

• Supports parallel data loading or serial shifting operations
• Includes gated clock inputs for controlled data transfer
• Features an overriding clear input for immediate reset
• Integrates input clamping diodes to suppress switching noise

Applications

• Parallel-to-serial data conversion circuits
• Serial-in, parallel-out expansion modules
• Digital signal processing interfaces requiring data serialization
• General-purpose shift register applications in embedded systems

Procurement Notes

Verify the specific suffix 'E' against the official Renesas datasheet to confirm environmental compliance status, as legacy LS series parts may have varying RoHS classifications. Confirm package availability and moisture sensitivity levels prior to procurement planning. Check for active obsolescence notices or product change notifications that may affect long-term supply stability.

Selection Notes

Select this component when an 8-bit shift register with parallel load capability is required in a standard logic environment. Ensure the operating voltage and current drive specifications match the target system's logic levels. Consider the presence of internal clamping diodes if interfacing with inductive loads or high-speed signals without external protection.

Part Context

This part belongs to the Renesas 74LS series, which implements Low-power Schottky TTL logic standards. It is part of a broader portfolio of discrete logic components designed for general-purpose digital applications. The 74LS family is known for its balance between speed and power consumption compared to standard TTL counterparts.

Replacement Considerations

Compatible substitutes include HD74LS166P from Renesas/Hitachi, MC10E141 from ON Semiconductor, TC7MH165FK from Toshiba, and GD4021B from List of Unclassified Manufacturers. Verify pin compatibility and electrical characteristics before substitution.