SN74S138ANG4

Signal Switches, Multiplexers, Decoders Overview

The SN74S138ANG4 is a Schottky TTL logic component manufactured by Texas Instruments, functioning as a 3-line to 8-line decoder and demultiplexer. It features three binary address inputs (A, B, C) and eight active-low outputs (Y0–Y7). The device includes three enable inputs: two active-low (G2A, G2B) and one active-high (G1), which must be in their correct states for the selected output to activate. Packaged in a 16-pin Small Outline Integrated Circuit (SOIC), it operates within standard industrial temperature ranges and supports high-speed switching applications typical of the S-series logic family.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides decoding or demultiplexing functions with three binary address inputs controlling eight active-low outputs
• Incorporates three independent enable inputs requiring specific logic levels to activate the device
• Utilizes Schottky transistor-transistor logic technology for enhanced switching speed and noise immunity

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in microprocessor-based memory systems
• Demultiplexing data streams in digital communication circuits
• Control signal generation for peripheral device selection

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the complete part number including the DG4 suffix against official Texas Instruments documentation to confirm lead-free compliance and RoHS status. Ensure the SOIC-16 package dimensions match your PCB footprint requirements. Confirm that the Schottky TTL voltage levels are compatible with your system's logic thresholds before integration.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when high-speed decoding is required using standard TTL voltage levels. The SN74S138ANG4 is suitable for designs needing active-low outputs and multiple enable controls. Consider the Schottky technology benefits over standard LS series if propagation delay is critical. Verify that the operating temperature range meets your environmental specifications.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the SN74S138 family of decoders and demultiplexers from Texas Instruments. The 'S' designation indicates Schottky TTL construction, offering faster performance than standard LS variants. The 'A' prefix often denotes improved versions or specific manufacturing revisions within the legacy logic portfolio. The 'G4' suffix typically signifies lead-free and RoHS-compliant packaging standards.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the SN74LS138 for slower, lower-power applications and the SN54S138 for military-grade temperature ranges. Verify pin compatibility and logic level tolerances when replacing with other 3-to-8 line decoders.