SN7438N

Overview

The SN7438N is a quad 2-input NAND gate integrated circuit manufactured by Texas Instruments. It belongs to the standard 7400 logic series and features open-collector outputs, allowing for flexible interfacing with various load types. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports through-hole mounting in a 14-pin PDIP package. It is designed for commercial temperature ranges from 0°C to +70°C.

Feature Summary

• Contains four independent 2-input NAND logic gates
• Features open-collector output configuration for wired-AND capabilities
• Compatible with standard TTL logic input levels

Applications

• General-purpose digital logic switching
• Wired-AND bus line interfacing
• Load driving applications requiring external pull-up resistors

Procurement Notes

Verify the specific suffix 'N' corresponds to the 14-pin PDIP package when sourcing. Confirm that the component meets RoHS compliance requirements if applicable to your manufacturing standards. Ensure the supplier provides official datasheets to validate the open-collector specifications and electrical characteristics before integration.

Selection Notes

Select this component when open-collector outputs are required for interfacing with different voltage domains or implementing wired-logic functions. It serves as a direct replacement for other 74LS38 variants where pin compatibility is maintained, though drive current and speed characteristics may differ slightly between sub-series.

Part Context

This part is part of the industry-standard 7400 series of logic ICs, widely used in digital electronics. The SN7438 variant specifically utilizes open-collector technology, distinguishing it from standard push-pull output NAND gates like the SN7400. It remains a common choice for legacy designs and simple interface circuits.