SNJ54HC138FK

Signal Switches, Multiplexers, Decoders Overview

The SNJ54HC138FK is a military-grade 3-to-8 decoder and demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -55 °C to 125 °C. The device features three binary select inputs (A, B, C) and three enable inputs (one active-high G1, two active-low G2A and G2B). It provides eight active-low outputs (Y0 through Y7), where only the selected output is driven low while others remain high. The component utilizes a 20-pin Leadless Ceramic Chip Carrier (LCCC) package with dimensions of 8.89 mm x 8.89 mm.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides three binary select inputs to activate one of eight active-low outputs
• Incorporates three enable inputs to facilitate cascading or data reception applications
• Designed for high-speed memory decoding and data-routing requiring short propagation delays

Signal Switches, Multiplexers, Decoders Applications

• High-speed memory decoders
• Data-transmission systems
• LED matrix displays
• Servers
• Factory automation

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the specific ordering suffix FK corresponds to the LCCC package variant. Confirm RoHS compliance status as indicated in the packaging addendum. Ensure the procurement channel sources parts matching the SNJ54HC138FK designation to guarantee the specified military-grade temperature range and performance characteristics.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a 3-to-8 decoding function is required in harsh environments. The wide operating voltage range allows compatibility with various logic families. The inclusion of multiple enable pins simplifies system expansion without additional external gates. Verify that the thermal resistance metrics align with the specific PCB layout constraints.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SNx4HC138 family of 3-line to 8-line decoders and demultiplexers. The 'SNJ' prefix indicates a military-grade version with extended temperature capabilities compared to commercial variants. The 'FK' suffix specifically identifies the 20-pin LCCC package option, distinguishing it from ceramic dual in-line or flatpack packages available within the same functional family.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN54HC138FK

Signal Switches, Multiplexers, Decoders FAQ

How many enable inputs does the SNJ54HC138FK have?

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

What is the state of unselected outputs?

When enabled, the selected output is pulled LOW, while all remaining unselected outputs remain HIGH.