7439PC

Overview

The 7439PC is a quad NAND gate integrated circuit manufactured by National Semiconductor. It features four independent two-input NAND gates with open-collector outputs, housed in a 14-pin plastic dual in-line package (PDIP). The device operates within the standard TTL logic family, providing reliable digital switching for general-purpose logic applications.

Feature Summary

• Contains four independent two-input NAND logic gates
• Utilizes open-collector output configuration for flexible interfacing
• Designed for standard TTL logic voltage levels

Applications

• General-purpose digital logic circuits
• Open-collector bus interfacing
• Logic level translation interfaces

Procurement Notes

Verify manufacturer origin as National Semiconductor or Texas Instruments due to acquisition history. Confirm package type is 14-PDIP and logic family is standard TTL. Check datasheet for specific electrical characteristics matching system requirements before integration.

Selection Notes

Select this component when multiple independent NAND functions are required in a single package. The open-collector outputs allow for wired-AND connections and driving loads at different voltage levels than the logic supply. Ensure compatibility with existing TTL design constraints.

Part Context

This part belongs to the standard 7400 series of logic ICs, widely used in digital electronics. National Semiconductor was acquired by Texas Instruments, which continues to support legacy parts. The 7439PC remains a common choice for simple logic inversion and combination tasks in embedded systems.

Replacement Considerations

Compatible substitutes include other manufacturers' 74LS39 or 74S39 equivalents in PDIP-14 packages. Verify pinout compatibility and electrical specifications such as propagation delay and output current capability before substitution.