4085BDC

Overview

The National Semiconductor 4085BDC is a CMOS AND-OR-INVERT gate integrated circuit housed in a 14-pin ceramic dual in-line package (CDIP). It contains two configurable logic circuits with a total of eight inputs, structured as four pairs of two-input gates. The device operates within a standard supply voltage range typical for CD4000 series CMOS technology and is designed for high-noise immunity applications. The ceramic package provides enhanced durability and thermal stability compared to plastic variants, making it suitable for demanding environments.

Feature Summary

• Configurable AND-OR-INVERT logic structure allowing flexible implementation of complex boolean functions
• Dual independent circuit design enabling simultaneous processing of separate logic paths
• Ceramic dual in-line packaging offering superior environmental resistance and mechanical robustness

Applications

• Industrial control systems requiring reliable logic gating
• Military and aerospace electronics due to ceramic construction
• High-noise industrial environments utilizing CMOS noise immunity

Procurement Notes

Verify the manufacturer marking matches National Semiconductor or Texas Instruments, as NSC was acquired by TI. Confirm the package material is ceramic, indicated by the 'C' suffix, to distinguish from plastic DIP versions. Check for MIL-STD-883 compliance if military-grade qualification is required. Ensure the pinout corresponds to the standard 14-pin CDIP layout. Request batch codes to assess component age and storage history.

Selection Notes

Select this component when a specific AND-OR-INVERT function is needed with high reliability requirements. The ceramic package is essential for applications involving extreme temperatures or harsh physical conditions where plastic packages may fail. Compare against other CD4000 series parts if different logic configurations are acceptable. Consider lead time implications for ceramic packages which may have longer manufacturing cycles than plastic equivalents.

Part Context

The 4085BDC belongs to the CD4000 series of CMOS logic devices originally developed by National Semiconductor. This series established standards for low-power digital logic using complementary metal-oxide-semiconductor technology. The BDC variant specifically denotes the ceramic package option, distinguishing it from the plastic DIP versions like 4085BCN. These components remain relevant in legacy system maintenance and specialized high-reliability designs.

Replacement Considerations

• 4085BCN (Plastic DIP equivalent)
• MC14085BDR2G (Motorola/Freescale equivalent)

FAQ

What is the logic function of the 4085BDC?

It implements an AND-OR-INVERT function with two configurable circuits.

Does the 4085BDC use a plastic or ceramic package?

It uses a ceramic dual in-line package (CDIP), indicated by the 'C' in the part number.