74H40PC

Overview

The 74H40PC is a dual 4-input NAND gate integrated circuit manufactured by National Semiconductor. It is housed in a 14-pin Dual In-line Package (PDIP). The device implements standard TTL logic functions, providing two independent NAND gates within a single package. This component is designed for digital logic applications requiring multiple input gating capabilities.

Feature Summary

• Dual channel configuration with four inputs per gate
• Standard TTL logic family compatibility
• Through-hole mounting via 14-pin PDIP package

Applications

• Digital logic circuit construction
• Control systems implementation
• General-purpose digital switching

Procurement Notes

Verify the manufacturer designation as National Semiconductor or its successor Texas Instruments, as production rights have transferred. Confirm the package type is strictly 14-pin PDIP to ensure mechanical fit. Check for any specific suffix variations that may indicate temperature range or lead-free compliance, ensuring the base part number matches the required logic specifications.

Selection Notes

Select this component when a dual 4-input NAND function is required in a through-hole assembly. Ensure the design supports TTL voltage levels and current requirements. Consider pin-compatible alternatives if the original manufacturer discontinues the specific package style, verifying logical equivalence before substitution.

Part Context

This part belongs to the 74Hxx series of high-speed TTL logic devices from National Semiconductor. The series provides faster switching speeds compared to standard 74LS variants while maintaining compatible logic levels. The 74H40 specifically offers a compact solution for complex gating needs in legacy or industrial digital designs.

Replacement Considerations

Check for SN74H40PC from Texas Instruments as a direct continuation. Verify pinout and electrical characteristics match exactly before substituting.