SN74AHCT138NSR

Signal Switches, Multiplexers, Decoders Overview

The SN74AHCT138NSR is a Texas Instruments 3-line to 8-line decoder/demultiplexer in the AHCT logic family. It operates on a single supply voltage ranging from 1.5 V to 5.5 V, with a recommended operating temperature range of -40°C to +85°C. The device features three address inputs (A, B, C) and eight active-low outputs (Y0-Y7). It incorporates three enable inputs: one active-high (G1) and two active-low (G2A, G2B), which facilitate cascading and demultiplexing functions without external inverters. Packaged in a 16-pin SOP (NS) format, it provides TTL-voltage compatible inputs and high ESD protection.

Signal Switches, Multiplexers, Decoders Feature Summary

• TTL-voltage compatible inputs for direct interfacing with standard logic families
• Three enable inputs simplify system expansion and data routing applications
• Designed for high-speed memory decoding with minimal propagation delay impact

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding systems
• Data-transmission systems requiring fast signal routing
• Cascaded decoder configurations for expanded address lines

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package marking and lead finish against the latest TI Package Option Addendum to ensure compatibility with assembly processes. Confirm that the ordering suffix matches the required tape and reel specifications for automated placement. Cross-reference the moisture sensitivity level rating with your facility's floor life requirements before soldering.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible input thresholds are required within an AHCT performance envelope. The NS package offers a surface-mount solution suitable for space-constrained designs. Ensure the application environment remains within the specified -40°C to +85°C operating temperature range to maintain electrical characteristics.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SNx4AHCT138 series of 3-line to 8-line decoders and demultiplexers. The 'SN74' prefix indicates commercial grade availability, while 'AHCT' denotes High-Speed CMOS technology with TTL-compatible inputs. The 'NS' suffix specifically identifies the 16-pin Small Outline Package (SOP) variant manufactured by Texas Instruments.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible alternatives include other variants within the SN74AHCT138 family such as SN74AHCT138DR or SN74AHCT138PWR, provided the pinout and functional logic remain identical. Verify thermal resistance values if transitioning between different package types like SOIC or TSSOP.