74HCT540D,653

Overview

The Nexperia 74HCT540D,653 is an octal buffer and line driver with inverting outputs and three-state capability. It operates within a supply voltage range of 4.5 V to 5.5 V. The device features two active-low output enable inputs (OE1 and OE2) that force outputs into a high-impedance state when asserted HIGH. Inputs include clamp diodes for interfacing with voltages exceeding VCC. It utilizes a 20-lead SO plastic small outline package (SOT163-1).

Feature Summary

• Octal inverting buffer/line driver with three-state outputs controlled by two independent enable inputs.
• TTL-compatible input levels designed for operation at standard 5 V logic supply voltages.
• Input protection via integrated clamp diodes allows safe interfacing with signals exceeding the supply rail.

Applications

• High-speed data bus buffering applications requiring signal inversion.
• Driving capacitive or transmission line loads in digital communication systems.
• Memory address and data bus drivers where tri-state isolation is required.

Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature rating. Confirm RoHS compliance status and REACH registration details directly with the manufacturer prior to procurement. Ensure the selected variant aligns with the intended operating voltage and environmental conditions specified in the product data sheet.

Selection Notes

Select this component when TTL-level inputs are required alongside CMOS drive strength. Verify that the 4.5 V to 5.5 V supply range meets system requirements. Consider the 20-lead SO package dimensions for PCB layout constraints. Evaluate propagation delay specifications against the target clock frequencies to ensure timing margins are sufficient.

Part Context

This part belongs to the 74HCT series of high-speed CMOS logic devices manufactured by Nexperia. It is functionally compatible with other 74HCT family members but provides specific octal buffering capabilities. The D,653 suffix indicates the SO20 package configuration and standard reel packaging format.

Replacement Considerations

Cross-reference with other manufacturers' 74HCT540 equivalents such as SN74HCT540 or MC74HCT540. Verify pinout compatibility and electrical parameter alignment before substitution. Check for any differences in ESD protection ratings or package thermal characteristics.