74HCT640DB,118

Overview

The 74HCT640DB,118 is an octal bus transceiver manufactured by NXP Semiconductors. It features inverting 3-state outputs compatible with both send and receive directions. The device operates within a supply voltage range of 4.5 V to 5.5 V. It utilizes SSOP-24 packaging for surface mount installation. The component supports a wide operating temperature range from -40 °C to +125 °C. Propagation delay is specified at 25 ns. Input levels are compatible with TTL standards.

Feature Summary

• Octal bidirectional bus interface capability
• Inverting 3-state output configuration
• Bus driver output capability
• TTL-compatible input levels

Applications

• Bidirectional data bus transmission
• Memory interface circuits
• Microprocessor system interconnects
• I/O port expansion

Procurement Notes

Verify the specific manufacturer designation as Nexperia or NXP Semiconductors on official documentation, as corporate branding has changed. Confirm the package type is SSOP-24 and check for RoHS compliance status. Ensure the logic family is HCT for proper voltage level compatibility. Validate the part number suffix against current distributor catalogs to avoid obsolete stock.

Selection Notes

Select this component when an octal bidirectional buffer with inverting functionality is required. The HCT series ensures compatibility with standard TTL logic levels. Verify that the 3-state outputs meet the bus driving requirements. Check that the SSOP-24 package fits the PCB layout constraints. Ensure the operating temperature range matches the environmental conditions of the target application.

Part Context

This device belongs to the 74HCT640 family of high-speed Si-gate CMOS devices. It is pin compatible with low power Schottky TTL (LSTTL) standards. The family is designed for general-purpose digital applications requiring reliable bus interfacing. The component adheres to JEDEC standard no. 7A specifications for CMOS operation.

Replacement Considerations

• 74HC640DB,118
• SN74HCT640N
• MC74HCT640AN