MC74HCT244AF

Overview

The MC74HCT244AF is an octal buffer and line driver manufactured by onsemi, belonging to the HCT logic series. It features eight non-inverting inputs with three-state outputs, housed in a 20-SOIC package. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical specifications include a maximum propagation delay of 28 ns at 5 V, high-level output current of -6 mA, and low-level output current of 6 mA. Quiescent current is typically 4 µA, with a maximum operating power supply current of 160 µA.

Feature Summary

• Provides octal buffering with three-state output capability for bus-oriented systems
• Compatible with TTL voltage levels through HCT CMOS technology
• Non-inverting signal transmission ensures data integrity across drivers

Applications

• Bus-oriented memory and address drivers
• Clock drivers and buffer circuits
• Line driver applications requiring three-state control

Procurement Notes

Verify the specific suffix 'AF' against the manufacturer's official datasheet to confirm package type and temperature rating. Ensure compatibility with existing PCB footprints for the 20-SOIC configuration. Cross-reference ordering information directly with onsemi documentation to avoid discrepancies in revision levels or regional variants.

Selection Notes

Select this component when an octal buffer with three-state outputs is required for TTL-compatible interfaces. The HCT series ensures compatibility with standard 5 V logic systems. Consider the 20-SOIC package constraints and thermal dissipation requirements relative to the application's power budget and environmental conditions.

Part Context

This part belongs to the 74HCT244 family of octal buffers. It serves as a digital logic interface component designed for driving loads on buses or lines. The HCT designation indicates high-speed CMOS technology compatible with TTL inputs, making it suitable for mixed-logic system designs requiring reliable signal buffering.

Replacement Considerations

Check for direct equivalents such as MM74HCT244MTC from onsemi, noting differences in package (TSSOP vs SOIC) and operating temperature ranges. Verify pinout compatibility before substitution.