MC74VHCT240AM

Overview

The MC74VHCT240AM is an octal inverting buffer and line driver from onsemi's VHCT logic family. It features a silicon gate CMOS fabrication process with 3-state outputs. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a propagation delay of 6.1 ns, high-level output current of -8 mA, and low-level output current of 8 mA. Static current is specified at 1.35 mA, with a maximum power dissipation of 1.302 W. It supports surface mount installation in SOIC-20 packages and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Octal bus buffer configuration with eight independent input-output channels
• Inverting logic polarity for signal phase reversal applications
• Three-state output capability enabling bus line isolation
• CMOS technology ensuring high-speed operation with defined drive strength

Applications

• High-speed data bus buffering in computer systems
• Memory address and data line drivers
• Clock distribution networks requiring inversion
• Industrial control system interface circuits

Procurement Notes

Verify the specific suffix 'AM' against official onsemi documentation to confirm package type and material specifications. Ensure compatibility with existing PCB footprints for SOIC-20 or equivalent variants. Confirm RoHS compliance status through the manufacturer's latest product change notices. Validate that the 4.5 V to 5.5 V operating range matches the target system power supply constraints before finalizing procurement orders.

Selection Notes

Select this component when an octal inverting buffer with 3-state outputs is required for 5 V logic systems. The VHCT series offers speed comparable to LVC while maintaining TTL-compatible input thresholds. Consider the 6.1 ns propagation delay for timing-critical paths. Evaluate the 8 mA drive capability against load requirements. Compare against non-inverting alternatives if phase alignment is critical rather than inverted.

Part Context

This part belongs to onsemi's VHCT logic family, designed for high-speed CMOS applications with TTL-compatible inputs. The VHCT series bridges the performance gap between standard HC/HCT and advanced LVC technologies. It is commonly used in embedded systems where moderate speed and robust noise immunity are necessary. The octal configuration reduces board space compared to individual single-gate solutions.

Replacement Considerations

Direct substitutes include MC74VHCT240ADWR2G and MM74HCT240MTCX. Verify pinout compatibility and package dimensions before substitution. Check if the alternative offers identical propagation delays and drive currents. Ensure the replacement maintains the same 3-state output functionality and inverting polarity.