JM54ACT138SEA-R

Overview

The JM54ACT138SEA-R is a high-speed 1-of-8 decoder/demultiplexer manufactured by National Semiconductor. It features three enable inputs and provides inverted outputs, making it suitable for high-speed bipolar memory chip select address decoding. The device operates within the ACT series specifications, utilizing CMOS technology to deliver performance comparable to low-power Schottky TTL while offering improved speed and power efficiency. It is housed in a 16-CDIP package with a width of 0.300 inches (7.62mm), designed for robust digital electronics and computer system applications requiring reliable signal routing and address decoding.

Feature Summary

• High-speed 1-of-8 decoding capability for efficient address selection
• Three independent enable inputs for precise control logic management
• Inverted output configuration compatible with standard digital interfaces
• CMOS construction ensuring low power consumption relative to performance

Applications

• High-speed bipolar memory chip select address decoding
• Digital electronics systems requiring demultiplexing functions
• Computer systems for control signal distribution

Procurement Notes

Verify the manufacturer designation as National Semiconductor, now part of Texas Instruments, to ensure component authenticity. Confirm the specific suffix 'R' indicates the correct tape-and-reel or packaging variant if applicable, though datasheets may list CDIP packaging. Check RoHS compliance status against current regulatory requirements for your region. Ensure the 16-CDIP package dimensions match your PCB footprint constraints. Validate that the inverted output logic aligns with your circuit design before procurement.

Selection Notes

Select this component when high-speed address decoding is required for bipolar memory interfaces. The ACT series offers a balance of speed and power dissipation superior to standard AC devices. Consider the 16-CDIP package only if through-hole mounting is necessary for mechanical stability or legacy board compatibility. Verify that the three enable inputs meet your system's control logic complexity. Compare against similar decoders if surface-mount options are preferred for modern assembly processes.

Part Context

The JM54ACT138SEA-R belongs to the 54/74ACT family of logic devices, which are designed to bridge the performance gap between older TTL standards and newer CMOS technologies. This specific model is a derivative of the widely used 54ACT138, adapted for military or extended temperature ranges indicated by the 'JM' prefix in some naming conventions, though primarily identified as a National Semiconductor product. It serves as a critical interface component in complex digital systems where reliable signal demultiplexing is essential.

Replacement Considerations

Direct substitutes include other 54ACT138 variants from manufacturers such as GE Solid State, specifically the CD54ACT138H. Ensure any replacement maintains the same 1-of-8 decoding function, inverted outputs, and three-enable input structure. Verify pinout compatibility to avoid redesigning the host circuit. Confirm that the substitute device meets the same electrical specifications for speed and power consumption.