SNJ54LVC138AFK

Signal Switches, Multiplexers, Decoders Overview

The SNJ54LVC138AFK is a military-grade 3-to-8 decoder and demultiplexer from the LVC family. It operates on a supply voltage of 2 V to 3.6 V with inputs tolerant up to 5.5 V. The device features low output ground bounce and high latch-up protection exceeding 250 mA per JESD 17. It utilizes a 20-pin LCCC (FK) package designed for high-reliability applications requiring fast propagation delays.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides three binary select inputs to activate one of eight active-low outputs while keeping others high
• Includes two active-low and one active-high enable pins to facilitate system expansion without external inverters
• Supports mixed-voltage environments by accepting 5.5 V input signals while operating at lower supply voltages

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding systems
• Data routing in complex digital architectures
• LED matrix display column selection drivers

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific military qualification status and lot traceability requirements associated with the SNJ prefix before procurement. Confirm that the 20-pin LCCC package dimensions match the target PCB footprint exactly. Ensure ESD handling protocols are strictly followed during storage and assembly due to MOS gate sensitivity.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring extended temperature ranges and high reliability standards typical of military or aerospace environments. Consider the 5.5 V input tolerance if interfacing directly with legacy 5 V logic sources without level shifting circuitry. Evaluate the thermal resistance metrics provided for the LCCC package against the expected power dissipation in the final enclosure.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN54/74LVC138A series, which standardizes 3-line to 8-line decoding functions across commercial and military grades. The SNJ designation specifically indicates the military grade variant housed in a ceramic LCCC package, distinguishing it from the commercial SOIC or TSSOP versions found in general consumer electronics.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SNJ54LVC138AJ

Signal Switches, Multiplexers, Decoders FAQ

How does the enable configuration affect decoder expansion?

The combination of two active-low and one active-high enable inputs allows for cascading multiple decoders to create larger address spaces, such as a 24-line decoder, without requiring additional external logic gates.

What is the maximum input voltage supported?

The inputs can accept voltages up to 5.5 V, allowing direct interfacing with 5 V logic families even when the device is powered by lower supply voltages like 3.3 V or 1.65 V.