SN74HC138PW

Overview

The SN74HC138PW is a single 3-to-8 decoder and demultiplexer manufactured by Texas Instruments in the HC logic family. It operates within a supply voltage range of 2 V to 6 V and features three binary select inputs (A, B, C) and three enable inputs (G1, G2A, G2B). The device provides eight active-low outputs (Y0–Y7), where only one output is pulled low based on the input selection. It utilizes a TSSOP-16 package with dimensions of 5.00 mm x 4.40 mm. Recommended operating conditions specify a temperature range of -40°C to +85°C.

Feature Summary

• Incorporates three enable inputs to simplify cascading or data reception applications
• Designed for high-speed memory decoding and data-routing requiring short propagation delays
• Outputs can drive up to ten LSTTL loads

Applications

• LED Displays
• Servers
• White Goods
• Power Infrastructure
• Building Automation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum. Confirm that the component status matches project requirements, as certain packaging variants may be obsolete while others remain in production. Ensure the selected part meets all environmental compliance standards required for the intended deployment.

Selection Notes

Select this component when a CMOS 3-to-8 decoder with active-low outputs is required for system expansion. The inclusion of multiple enable pins allows for flexible configuration without external inverters. Verify that the TSSOP-16 package footprint aligns with the PCB layout constraints and thermal management strategy.

Part Context

This device belongs to the SNx4HC138 series of high-speed CMOS logic decoders. It functions as a core addressing component in digital systems, translating binary codes into one-of-eight signals. The HC technology ensures balanced output drive characteristics suitable for driving various logic families and peripheral devices efficiently.

Replacement Considerations

SN74HC138PWR