SNJ54HC139FK

Signal Switches, Multiplexers, Decoders Overview

The SNJ54HC139FK is a military-grade dual 2-line to 4-line decoder/demultiplexer housed in a 20-pin LCCC package. 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 two independent decoders with active-low outputs and dedicated enable inputs. Electrical characteristics include a maximum input clamp current of ±20 mA, continuous output current of ±25 mA, and a typical propagation delay of 10 ns at 5 V.

Signal Switches, Multiplexers, Decoders Feature Summary

• Incorporates two independent 2-to-4 decoders or demultiplexers within a single package
• Features active-low outputs gated by dedicated strobe inputs for data reception control
• Designed for high-speed memory decoding and data-transmission systems
• Provides fully buffered inputs representing only one normalized load to the driving circuit

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory system decoding
• Data-routing applications requiring short propagation delays
• Demultiplexing circuits utilizing the enable input as a data line

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the component matches the specific SNJ54HC139FK part number and LCCC package configuration. Confirm the manufacturer is Texas Instruments and check for any military qualification markings if required for the application. Ensure documentation aligns with the SCLS108E datasheet revision.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when military-grade reliability and wide temperature operation are required. The HC technology offers low power consumption and high speed suitable for complex digital logic. Consider the 20-pin LCCC package constraints for board layout and thermal management compared to standard plastic packages.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SN54HC139 family, which includes variants in CDIP, CFP, and other packages. The 'SNJ' prefix indicates a military grade part, while 'FK' specifies the leadless ceramic chip carrier package. It is distinct from commercial SN74HC139 versions which have narrower temperature ranges.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct replacements include other SNJ54HC139 variants such as SNJ54HC139J (CDIP) or SNJ54HC139W (CFP), provided the package footprint is compatible. Cross-package substitution requires verifying pinout compatibility and mechanical fit.