JD54LS244SRA

Overview

The JD54LS244SRA is an octal buffer and line driver manufactured by National Semiconductor. It belongs to the 54LS series of TTL logic devices, featuring two independent four-bit bus drivers with true outputs. The component utilizes a ceramic surface-mount package, specifically identified as SRA, which corresponds to a small outline J-leaded chip carrier configuration. It operates with a nominal supply voltage of 5 V and supports a wide temperature range from -55 °C to 125 °C, suitable for military-grade applications. The device provides three-state outputs controlled by low-active enable signals.

Feature Summary

• Octal architecture providing two independent four-bit bus drivers
• Three-state output capability for efficient bus management
• Military-grade reliability with extended temperature operation range
• Low-power Schottky (LS) TTL technology for reduced power consumption

Applications

• High-performance memory mapping systems
• Clock drivers and buffered clock distribution
• Bus-oriented architectures requiring signal isolation

Procurement Notes

Verify the specific suffix 'SRA' confirms the ceramic surface-mount package type, as package variations significantly impact mounting requirements. Ensure the component meets MIL-STD-883 Class C screening standards if military qualification is required. Confirm RoHS status, as this part is typically non-compliant due to its vintage and material composition. Cross-reference with Texas Instruments documentation, as TI acquired National Semiconductor's logic product lines.

Selection Notes

Select this component when an octal buffer with three-state control is required in a space-constrained surface-mount design. The LS series offers a balance of speed and power dissipation suitable for standard TTL interfaces. Consider the ceramic package for superior thermal performance and hermetic sealing compared to plastic alternatives. Verify pin compatibility with existing PCB footprints designed for SOIC or similar small-outline packages.

Part Context

This part is part of the 54LS244 family, widely used in digital systems for driving high-capacitance loads. National Semiconductor was a primary producer before being acquired by Texas Instruments. The 54-series designation indicates military-grade specifications, distinguishing it from the commercial 74-series variants. The JD prefix often denotes specific distributor or manufacturer coding within the National Semiconductor ecosystem.

Replacement Considerations

SN54LS244JC: Ceramic DIP alternative with identical electrical characteristics but through-hole packaging. SN54S244L: Faster S-TTL variant with different power-speed trade-offs. JD54LS244SR: Plastic surface-mount version; verify package dimensions and thermal properties differ from the ceramic SRA variant.