SN74AHC138NSR

Signal Switches, Multiplexers, Decoders Overview

The SN74AHC138NSR is a single 3-line to 8-line decoder/demultiplexer manufactured by Texas Instruments. It belongs to the AHC logic series and operates within a supply voltage range of 2 V to 5.5 V. The device features three address inputs (A0, A1, A2) and eight active-low outputs (Y0–Y7). It includes three enable inputs: two active-low (G1A, G1B) and one active-high (G2), which must be in the correct state for the decoder to function. The component is housed in a 16-pin SOIC package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides decoding functionality from three binary address lines to eight distinct active-low output lines.
• Incorporates three independent enable inputs to control device activation and prevent unintended signal propagation.
• Supports operation across a wide DC supply voltage range suitable for various digital logic systems.

Signal Switches, Multiplexers, Decoders Applications

• Address decoding for memory and I/O port selection in embedded systems
• Demultiplexing data streams to multiple destination lines
• Generating specific chip select signals for peripheral devices

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the exact suffix 'SR' against the manufacturer's official documentation to confirm the specific reel packaging configuration and tape-and-reel specifications. Ensure the order matches the required SOIC-16 package variant. Confirm RoHS compliance status through the latest datasheet revision notes before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a low-power CMOS decoder with a wide voltage operating range is required. The AHC series offers performance comparable to standard HC logic but with lower power consumption. Verify that the system voltage falls within the 2 V to 5.5 V range and that the package footprint matches the available PCB layout constraints.

Signal Switches, Multiplexers, Decoders Part Context

This part is a member of the Texas Instruments SN74AHC family of high-speed CMOS logic devices. The AHC series is designed to replace older HC/HCT technologies while providing improved power efficiency and broader voltage compatibility. It serves as a fundamental building block for digital address decoding and signal routing applications in consumer and industrial electronics.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include SN74AHC138DR and SN74AHC138DWR, which share identical logical functions and pinouts but differ in packaging or reel specifications. Cross-reference with SN74AHCT138 variants if TTL-compatible input thresholds are specifically required instead of CMOS levels.