MC74HCT244AWD

Overview

The MC74HCT244AWD is an octal 3-state non-inverting buffer and line driver manufactured by onsemi. It operates within a supply voltage range of 4.5 V to 5.5 V. The device features eight input lines and eight output lines, packaged in a wide SOIC-20 (DWG) format. Key electrical specifications include a high-level output current of -6 mA and a low-level output current of 6 mA. Static current consumption is specified at 4 µA, with a maximum operating supply current of 160 µA. The component supports a minimum operating temperature of -55 °C.

Feature Summary

• Provides octal buffering with three-state output control for bus-oriented systems
• Compatible with TTL logic levels due to HCT series design
• Pinout identical to LS244 for direct replacement in existing designs

Applications

• Bus-oriented memory and address drivers
• Clock drivers
• Buffering for TTL-to-NMOS level conversion

Procurement Notes

Verify the specific suffix 'AWD' against the manufacturer's official datasheet to confirm package type and temperature grade. Ensure compatibility with the target PCB footprint for the SOIC-wide-20 package. Confirm RoHS compliance status through the latest product release notes or distributor documentation before finalizing procurement.

Selection Notes

Select this component when interfacing TTL or NMOS devices requires level conversion or signal buffering. The HCT series ensures compatibility with standard CMOS logic families while maintaining TTL noise margins. Consider the wide operating temperature range if the application involves harsh environmental conditions. Verify that the 3-state outputs meet the system's bus isolation requirements.

Part Context

This part belongs to the 74HCT logic family, designed for high-speed CMOS operation with TTL-compatible inputs. The MC74HCT244A variant serves as an octal buffer, providing isolation and drive capability for digital signals. It is commonly used in computer systems and communication networks where reliable data transmission is critical.

Replacement Considerations

The datasheet states the pinout is identical to the LS244. Verify electrical parameters such as propagation delay and output current capabilities against the LS244 specification to ensure functional equivalence in the specific circuit application.