MC74HCT245ADWG

Overview

The MC74HCT245ADWG is an 8-bit bus transceiver from the HCT logic series, manufactured by onsemi. It features a 20-pin SOIC surface-mount package with three-state outputs and bidirectional data direction control. The device operates within a supply voltage range of 4.5V to 5.5V, supporting TTL/NMOS conversion. Key electrical parameters include a maximum propagation delay of 42ns at load capacitance, a maximum low-level output current of 6mA, and a maximum high-level output current of 6mA. It functions across an operating temperature range of -55°C to 125°C.

Feature Summary

• Bidirectional data transfer capability between two 8-bit buses controlled by a direction pin.
• Three-state outputs allow for effective bus isolation when the output enable signal is deactivated.
• HCT logic compatibility ensures interface alignment with standard TTL input levels.
• Robust latch-up performance provides protection against high-current transient events.

Applications

• High-speed data bus architectures requiring bidirectional signal routing
• System interconnects utilizing mixed voltage domains compatible with HCT standards
• Memory expansion modules and peripheral interface circuits

Procurement Notes

Verify the specific suffix 'ADWG' against the manufacturer's official datasheet to confirm package dimensions and tape-and-reel specifications. Ensure the procurement channel sources genuine onsemi components to guarantee compliance with the specified -55°C to 125°C operating temperature range and electrical characteristics. Cross-reference the RoHS status and halogen-free claims with current regulatory documentation prior to finalizing orders.

Selection Notes

Select this component when designing systems requiring 8-bit bidirectional communication with TTL-compatible inputs. The HCT series is appropriate for applications needing operation at 5V logic levels with defined noise margins. Consider the 20-pin SOIC package constraints for PCB layout. Evaluate the 42ns propagation delay against system timing requirements to ensure signal integrity is maintained across the bus width.

Part Context

This part belongs to the MC74HCT245 family of octal bus transceivers. It shares functional similarities with other 74HCT245 variants but is distinguished by its specific packaging and manufacturing lot codes. The HCT technology bridges CMOS density with TTL speed, making it a standard choice for general-purpose digital logic interfacing in industrial and commercial equipment.

Replacement Considerations

Compatible substitutes include the MC74HC245A for HC-series applications and generic 74HCT245 devices from other manufacturers such as Toshiba. Verify that replacement parts match the 20-pin SOIC footprint and maintain identical voltage and current ratings. Ensure any alternative meets the same thermal and electrical specifications for direct integration.