SN74LV138APWT

Overview

The SN74LV138APWT is a 3-line to 8-line decoder or demultiplexer from Texas Instruments' LV logic series. It operates within a supply voltage range of 2 V to 5.5 V and features surface-mount TSSOP-16 packaging. The device supports an operating temperature range of -40°C to +85°C. Key electrical characteristics include a maximum propagation delay of 9.5 ns at 5 V and typical output ground bounce (VOLP) of less than 0.8 V at VCC = 3.3 V. This component integrates three enable inputs for flexible system control.

Feature Summary

• Supports wide supply voltage operation from 2 V to 5.5 V
• Provides high-speed decoding with maximum propagation delay of 9.5 ns at 5 V
• Features low output ground bounce for signal integrity
• Includes three enable inputs for advanced control

Applications

• Address decoding for memory and I/O mapping
• Demultiplexing data streams in digital systems
• Control logic in embedded applications

Procurement Notes

Verify the specific suffix 'W' indicates the tape and reel packaging format, distinct from tube packages like APWR. Confirm RoHS compliance status through official manufacturer documentation. Ensure the operating temperature grade matches the application requirements, as variants may differ. Cross-reference the exact part number with the latest datasheet to confirm pinout and electrical specifications before integration.

Selection Notes

Select this component when a 3-to-8 line decoding function is required with low-voltage compatibility. The LV series offers improved performance over legacy LS logic while maintaining pin compatibility. Consider the TSSOP-16 package for space-constrained designs. Verify that the input voltage levels are compatible with the driving logic family to ensure proper switching thresholds.

Part Context

This device belongs to the SN74LV138A family of decoders and demultiplexers. It serves as a functional equivalent to standard 74LS138 devices but with enhanced speed and lower power consumption. The LV series is designed for applications requiring operation across a broad voltage range, making it suitable for mixed-voltage systems.

Replacement Considerations

The SN74LV138APWRG4 is a documented alternative variant within the same family, offering similar functionality in a TSSOP-16 package. Verify pin compatibility and electrical specifications before substitution.