54LS258B/BFA

Overview

The SN54LS258B/BFA is a military-grade quad 2-line to 1-line data selector/multiplexer manufactured by Rochester Electronics. It features four independent multiplexers, each selecting one of two data inputs based on a common select line. The device operates within a temperature range of -55°C to 125°C and utilizes a CDIP-14 ceramic package. It is characterized for TTL logic levels and meets DLA standards for critical supply applications.

Feature Summary

• Contains four independent 2-to-1 multiplexers with common select lines
• Military-grade reliability with extended temperature operation from -55°C to 125°C
• Ceramic dual in-line package (CDIP) construction for harsh environments

Applications

• Data routing in military avionics systems
• Signal selection in defense communication equipment
• Industrial control systems requiring high reliability

Procurement Notes

Verify the specific suffix BFA against original OEM documentation to confirm pinout and electrical characteristics match your design requirements. Ensure the CDIP-14 package dimensions are compatible with your PCB footprint. Confirm that the leaded composition complies with your assembly process specifications.

Selection Notes

Select this component when four independent signal paths require switching between two sources using a single control line per pair. The military temperature rating makes it suitable for aerospace or defense applications where standard commercial grades fail. Verify compatibility with existing TTL logic voltage levels in the system architecture.

Part Context

Rochester Electronics supplies this part as a qualified alternative to original manufacturers, often recreating wafers to meet MIL-PRF-38534 standards. The 54LS258 series belongs to the Low-power Schottky TTL family, offering a balance of speed and power consumption suitable for complex digital logic circuits in ruggedized electronics.

Replacement Considerations

Direct substitutes include other 54LS258 variants from original manufacturers such as Texas Instruments or National Semiconductor, provided they share the same military qualification and CDIP-14 package. Verify that any replacement maintains the same logical function and electrical parameters.