CD40257BF3

Signal Switches, Multiplexers, Decoders Overview

The CD40257BF3 is a quad 2-input multiplexer belonging to the Harris Corporation 4000/14000/40000 series of CMOS logic devices. It features four independent multiplexing functions, each selecting between two data inputs based on a common select line. The device utilizes a ceramic dual in-line package (CDIP) with 16 pins and metal-sealed cofired construction. It operates within a supply voltage range of 5V to 15V and supports an extended industrial temperature range from -55°C to 125°C. The output polarity is true, providing non-inverted signals.

Signal Switches, Multiplexers, Decoders Feature Summary

• Quad configuration providing four independent 2-to-1 multiplexing channels
• Common select input for synchronized channel switching across all functions
• True output polarity delivering non-inverted selected data signals
• Rad-hard capable design utilizing hermetic ceramic packaging

Signal Switches, Multiplexers, Decoders Applications

• Data routing in military and aerospace electronic systems
• Signal selection in high-reliability industrial control circuits
• Multiplexing interfaces in radiation-tolerant computing hardware
• Channel switching in defense communication equipment

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the specific part number suffix corresponds to the required radiation hardness level and screening standard. Confirm the package type matches the intended board layout, as ceramic DIP variants differ from plastic equivalents. Ensure the supplier provides traceability documentation for the metal-sealed cofired construction. Check for any specific handling requirements associated with rad-hard components during assembly.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when multiple independent signal paths require switching within a single integrated circuit. The common select feature simplifies control logic compared to discrete multiplexers. Consider the ceramic package for environments requiring hermetic sealing or high thermal stability. Verify that the 5V to 15V supply range aligns with the system power architecture.

Signal Switches, Multiplexers, Decoders Part Context

This device is part of the extensive Harris 4000-series CMOS logic family, known for broad compatibility with TTL standards. The CD40257 variant specifically addresses the need for multi-channel data selection in harsh environments. Its rad-hard designation distinguishes it from commercial-grade counterparts, ensuring performance under ionizing radiation conditions typical in space or nuclear applications.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Public confirmed substitute part numbers: CD40257BDMSH.