SN74LVC138APWT

Overview

The SN74LVC138APWT is a 3-line to 8-line decoder and demultiplexer from Texas Instruments' LVC logic family. It operates within a supply voltage range of 1.65 V to 3.6 V, supporting low-voltage digital systems. The device features three address inputs (A0–A2) and eight active-low outputs (Y0–Y7). Control is managed via two active-low enable inputs (G1, G2A/G2B) and one active-high enable input (G2A/G2B combined functionality depending on datasheet version, typically G1 high, G2A/B low for operation). It is housed in a TSSOP-16 surface-mount package.

Feature Summary

• Provides decoding or demultiplexing functions with three binary address inputs and eight mutually exclusive active-low outputs.
• Incorporates multiple enable inputs to facilitate system expansion and power management by disabling outputs when not selected.
• Designed for low-voltage applications with wide operating supply voltage compatibility.

Applications

• Memory address decoding in embedded systems
• I/O port selection in microcontroller interfaces
• Demultiplexing data streams in communication circuits

Procurement Notes

Verify the specific suffix 'PWT' corresponds to the TSSOP-16 package and tape-and-reel quantity as defined in the official Texas Instruments datasheet. Confirm RoHS compliance status and ensure the ordering part number matches the required temperature grade and packaging format for your manufacturing process.

Selection Notes

Select this component when a low-voltage 3-to-8 decoder is required with active-low outputs. Ensure the system supply voltage falls within the 1.65 V to 3.6 V range. Verify that the TSSOP-16 package dimensions fit the PCB layout constraints and that the propagation delay characteristics meet the timing requirements of the target application.

Part Context

This device belongs to the SN74LVC138A series of decoders and demultiplexers. It is part of the broader LVC logic family, which is optimized for low-power consumption and high-speed operation in portable and battery-powered devices. The 'PWT' suffix specifically denotes the TSSOP-16 package type and reel-based packaging.

Replacement Considerations

Compatible alternatives include SN74LVC138ADBR and SN74LVC138APWR from Texas Instruments, provided the package type and electrical specifications match the design requirements. Cross-vendor equivalents such as those from ON Semiconductor or NXP should be verified for pinout and voltage compatibility.