SN74AHCT138NG4

Signal Switches, Multiplexers, Decoders Overview

The SN74AHCT138NG4 is a 3-line to 8-line decoder/demultiplexer from the Texas Instruments AHCT logic family. It operates on a single supply voltage ranging from 1.5 V to 5.5 V, with a recommended operating range of 4.5 V to 5.5 V for TTL compatibility. The device features three enable inputs (one active-high G1 and two active-low G2A, G2B) to simplify cascading. It provides eight active-low outputs (Y0–Y7). Electrical characteristics include high-level output current of -8 mA and low-level output current of 8 mA at 5 V. Propagation delay is typically 10.4 ns at 5 V with 15 pF load. The component is housed in a 16-pin PDIP package.

Signal Switches, Multiplexers, Decoders Feature Summary

• TTL-voltage compatible inputs ensure seamless integration with standard logic systems.
• Three enable inputs facilitate simplified cascading and data reception control.
• Designed for high-speed memory decoding and data-routing applications requiring short propagation delays.
• Robust electrostatic discharge protection exceeding JESD standards.

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding systems
• Data-transmission systems
• System routing applications

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'G4' against the manufacturer's latest Package Option Addendum to confirm material composition and lead finish specifications. Ensure the selected package variant matches the required thermal resistance and moisture sensitivity level for the intended assembly process. Cross-reference the datasheet revision history for any updates to electrical characteristics or mechanical dimensions prior to finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible input levels are required within an AHC logic family environment. The device is suitable for designs needing precise address decoding with minimal system delay. Consider the PDIP package constraints regarding board space and thermal dissipation compared to surface-mount alternatives like SOIC or TSSOP if higher pin density is needed.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SNx4AHCT138 series of 3-line to 8-line decoders and demultiplexers manufactured by Texas Instruments. The series includes various package options such as SOIC, SSOP, TSSOP, and VQFN. The 'N' suffix denotes the PDIP package, while 'G4' indicates compliance with specific environmental and material standards defined by the manufacturer.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHCT138N

Signal Switches, Multiplexers, Decoders FAQ

How many enable inputs does the SN74AHCT138NG4 have?

The device incorporates three enable inputs: one active-high (G1) and two active-low (G2A and G2B).

What is the function of the enable inputs?

The enable inputs allow the selection of one of eight output lines based on binary-select inputs and simplify cascading or data reception without external inverters.