9403APC

FIFOs Memory Overview

The Fairchild Semiconductor 9403APC is an asynchronous First-In First-Out (FIFO) buffer memory component. It features a 16 x 4 bit organization, providing four words of storage depth with four bits per word width. The device is housed in a 24-pin Dual In-line Package (PDIP). It operates as a uni-directional buffer, designed for high-speed data transfer applications such as disk or tape systems.

FIFOs Memory Feature Summary

• Expandable fall-through architecture for sequential data buffering
• Asynchronous operation optimized for high-speed interfaces
• Uni-directional data flow capability

FIFOs Memory Applications

• High-speed disk drive interface buffering
• Tape drive data transfer systems
• Digital logic circuit data synchronization

FIFOs Memory Procurement Notes

This component is marked as obsolete and no longer in production by Fairchild Semiconductor. Verification of authenticity is critical when sourcing from secondary markets, as availability is limited to new old stock or surplus inventory. Buyers must confirm the specific lot date code and physical condition, as these parts are discontinued and may exhibit age-related degradation. Ensure the supplier provides valid traceability documentation.

FIFOs Memory Selection Notes

Engineers selecting this part should note its discontinuation status. The 9403A series is a legacy FIFO solution. Modern designs typically require checking for pin-compatible or functionally equivalent replacements from current manufacturers. Due to the obsolescence, lead times for remaining stock are unpredictable. Design-in decisions should prioritize availability and long-term supply chain stability over legacy compatibility unless strictly required for existing hardware maintenance.

FIFOs Memory Part Context

The 9403A belongs to Fairchild's legacy line of asynchronous FIFO memories. These components were widely used before synchronous FIFOs became standard. The 'APC' suffix denotes the specific package type and temperature grade. This family was designed to handle data rate mismatches between fast processors and slower peripheral devices like magnetic storage media.

FIFOs Memory Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Users should consult current onsemi or Fairchild catalogs for modern asynchronous FIFO alternatives.