SN74LVC138ANS

Overview

The SN74LVC138ANS is a Texas Instruments 3-line to 8-line decoder/demultiplexer utilizing LVC technology. It operates on a single supply voltage ranging from 1.65V to 3.6V. The device features low input current and high noise immunity. Electrical characteristics include a maximum propagation delay of 6.7 ns at 3.3V. Output drive capability provides 24mA sink and source current. It is housed in a 16-pin SOIC package with a standard pinout for digital logic applications.

Feature Summary

• Provides decoding or demultiplexing functions for three binary inputs to eight active-low outputs
• Operates within a wide low-voltage power supply range suitable for portable electronics
• Features high noise immunity and low input current to reduce power consumption
• Includes dedicated enable inputs to control device operation state

Applications

• Address decoding for memory and I/O mapping in embedded systems
• Demultiplexing data streams in digital communication interfaces
• Control signal generation for peripheral device selection
• Logic level translation between different voltage domains

Procurement Notes

Verify the specific suffix 'ANS' indicates the SOIC-16 package variant when ordering. Confirm that the component meets the required operating temperature range of -40°C to +85°C for your application environment. Ensure compatibility with your system's voltage levels, as the device supports 1.65V to 3.6V. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when a 3-to-8 line decoding function is required in space-constrained designs. The SOIC-16 package offers a balance between pin count and board area. Consider the LVC technology for its low power consumption compared to older logic families. Verify that the output drive current of 24mA is sufficient for the connected loads without external buffering.

Part Context

This part belongs to the SN74LVC138A family of decoders and demultiplexers. It is designed for use in battery-powered and low-voltage digital circuits. The LVC series is known for high speed and low power dissipation. It serves as a direct replacement for similar 3-to-8 decoders in legacy designs requiring lower voltage operation.

Replacement Considerations

Compatible substitutes include SN74LVC138APW and SN74LVC138AD. Verify pin compatibility and electrical specifications before substitution. Ensure the alternative package type matches your PCB footprint requirements.