MC74VHC1GT125DBVT1G

Overview

The MC74VHC1GT125DBVT1G is a single non-inverting 3-state buffer from the VHC logic family, manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 5.5 V and features TTL-level input thresholds. The device provides high noise immunity through a buffered three-stage internal circuit. It supports partial power down protection via IOFF functionality and includes over-voltage tolerant inputs and outputs up to 5.5 V. Typical propagation delay is 3.5 ns at 5 V. It is housed in an SC-74A (SC-70-5) package with five pins.

Feature Summary

• Single-channel non-inverting buffer with 3-state output capability for bus line driving
• TTL-level input thresholds compatible with standard digital logic interfaces
• Over-voltage tolerant I/O structures protect against voltage mismatches during hot insertion or battery backup
• IOFF feature enables partial power down protection to prevent excessive current draw

Applications

• Bus-oriented communications systems requiring signal buffering
• Clock distribution circuits for timing signals
• Memory data bus drivers in embedded systems
• Interface bridging between 5 V and 3 V logic domains

Procurement Notes

Verify the specific suffix 'DBVT1G' corresponds to the SC-74A package and tape & reel shipping configuration. Confirm that the 'T' designation indicates TTL input thresholds, distinguishing it from the CMOS threshold variant. Ensure the order quantity aligns with the standard 3000-unit reel specification provided in the ordering information table.

Selection Notes

Select this component when a compact single-buffer solution with 3-state control is required. The TTL input threshold makes it suitable for interfacing with legacy 5 V logic families. Consider the SC-74A package for space-constrained PCB layouts where surface-mount assembly is preferred over larger footprint options like SOIC.

Part Context

This part belongs to the MC74VHC1G series of ultra-high-speed CMOS logic devices. It shares functional similarities with the MC74VHC1G125 but differs in input threshold characteristics. The GT variant specifically targets applications requiring compatibility with TTL logic levels while maintaining VHC speed performance in a minimal footprint.

Replacement Considerations

MC74VHC1G125DBVT1G: Identical function but uses CMOS-level input thresholds instead of TTL. Verify interface voltage compatibility before substitution.