SN74AS138NS

Overview

The SN74AS138NS is a high-speed silicon-gate ALS device from Texas Instruments, housed in a 16-pin SOIC package. It functions as a 3-line to 8-line decoder/demultiplexer within the SN74AS138 series. The component operates with a supply voltage range of 4.5 V to 5.5 V and supports a maximum propagation delay of 12 ns. It is designed for through-hole or surface-mount installation depending on specific variant configurations, though this part number denotes the SOIC form factor.

Feature Summary

• Provides high-speed decoding capabilities using advanced logic technology
• Converts three binary inputs into one of eight active-low outputs
• Includes dedicated enable inputs to manage device activation states

Applications

• Address decoding in microprocessor-based systems
• Memory chip selection circuits
• Industrial control system signal routing

Procurement Notes

Verify the exact suffix against the manufacturer's current datasheet to confirm pinout compatibility and package dimensions. Ensure the ordering code matches the specific temperature grade and packaging format required for your assembly process. Cross-reference the revision history for any recent manufacturing changes that might affect mechanical fit.

Selection Notes

Select this component when faster switching speeds than standard LS or ALS families are required. The AS series offers superior performance metrics suitable for high-frequency digital logic applications. Consider the SOIC package constraints regarding board space and thermal dissipation requirements during the design phase.

Part Context

This device belongs to the Texas Instruments SN74AS138 family of decoders. It shares functional logic with other variants but differs in package type and specific electrical characteristics defined by the AS logic family standards. It serves as a critical interface component for managing multiple output lines from a central processing unit.

Replacement Considerations

SN74AS138N

FAQ

What is the logic family classification of this component?

It belongs to the Advanced Low-power Schottky (ALS) logic family.

How many input lines does the decoder utilize?

The device utilizes three binary input lines to select one of eight outputs.