SN74AHCT138PW

Signal Switches, Multiplexers, Decoders Overview

The SN74AHCT138PW is a 3-line to 8-line decoder/demultiplexer from the Texas Instruments AHCT logic family, housed in a 16-pin TSSOP package. It operates within a supply voltage range of 1.5 V to 5.5 V and supports an operating temperature range of -40°C to +85°C. The device features TTL-compatible inputs and provides three enable inputs (one active-high G1, two active-low G2A/G2B) to simplify cascading. Propagation delay is typically 10.4 ns at 5 V with 15 pF load, or 11.4 ns with 50 pF load. Output drive capability is ±8 mA.

Signal Switches, Multiplexers, Decoders Feature Summary

• TTL-voltage compatible inputs for direct interfacing with standard logic families
• Three enable inputs allow simplified expansion and data reception control
• Designed for high-speed memory decoding and data-routing applications
• Robust electrostatic discharge protection exceeding JESD standards

Signal Switches, Multiplexers, Decoders Applications

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

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum. The 'PW' designation indicates a TSSOP-16 package. Confirm the operational status, as some variants may be obsolete while others remain active production. Ensure the required temperature grade and moisture sensitivity level align with the assembly process specifications.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-level input compatibility is required alongside CMOS low power consumption. The AHCT series bridges the gap between older TTL systems and modern CMOS designs. Consider the propagation delay characteristics relative to the system clock speed and ensure the thermal resistance of the TSSOP package suits the application's power dissipation requirements.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SNx4AHCT138 family of 3-line to 8-line decoders. It shares functional similarities with other members like the SN74AHCT138DR (SOIC) and SN74AHCT138PWR (TSSOP reel). The family is characterized by its ability to minimize system decoding delays in high-performance environments while maintaining compatibility with standard logic voltage levels.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHCT138PWR offers the same TSSOP-16 package but in tape-and-reel format. SN74AHCT138DR provides a SOIC-16 alternative. Verify pinout compatibility and electrical specifications before substitution.