MC74AC640DT

Overview

The MC74AC640DT is an octal buffer and line driver manufactured by onsemi, belonging to the 74AC logic series. It features true outputs and is housed in a 20-TSSOP surface-mount package with a width of 4.40mm. The device operates within a supply voltage range of 2V to 6V. Key electrical parameters include a maximum quiescent current of 4 µA and output drive capabilities of 24mA for both high and low states. Propagation delay is specified at 13ns @ 5V with a 50pF load. The component supports industrial operating temperatures from -40°C to 85°C.

Feature Summary

• Provides buffering and line driving functions for digital signals
• Features true (non-inverting) outputs for signal integrity
• Supports wide supply voltage operation for system flexibility

Applications

• High-speed data bus buffering
• Signal line drivers in communication interfaces
• Clock distribution networks

Procurement Notes

Verify the specific suffix 'DT' corresponds to the TSSOP-20 package configuration required for your PCB layout. Confirm RoHS compliance status matches project environmental regulations. Ensure the operating temperature range meets the thermal requirements of the final assembly environment before procurement.

Selection Notes

Select this component when an octal buffer with true output polarity is required. The 74AC series offers higher speed than standard 74LS logic while maintaining CMOS power efficiency. Verify that the 24mA output current capability is sufficient for the connected load capacitance and trace impedance.

Part Context

This part belongs to the MC74AC family of high-speed CMOS logic devices produced by onsemi. The AC series is designed to provide performance improvements over earlier logic families, offering faster switching speeds and lower power consumption. The octal configuration allows for parallel processing or bus interfacing applications requiring multiple simultaneous signal paths.

Replacement Considerations

Check for cross-manufacturer equivalents such as SN74AC640 from Texas Instruments. Verify pinout compatibility and electrical parameter alignment before substitution.