MC74VHC1GT125DFT2G

Overview

The MC74VHC1GT125DFT2G is a single non-inverting 3-state buffer from the VHC logic series, 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 with a 15 pF load. The component is housed in an SC-88A package.

Feature Summary

• Features TTL-level input thresholds for direct interfacing with 5 V circuits while operating at lower voltages.
• Provides partial power down protection capability through dedicated IOFF support.
• Includes over-voltage tolerant inputs and outputs rated up to 5.5 V regardless of supply voltage.
• Offers high noise immunity and stable output performance via a buffered three-stage internal design.

Applications

• Interfacing 5 V logic circuits to 3 V logic systems
• Partial power down protection in battery backup scenarios
• Hot insertion protection applications

Procurement Notes

Verify the specific suffix 'DFT2G' corresponds to the SC-88A package and tape & reel shipping configuration. Confirm that the 'T' designation indicates TTL input thresholds rather than CMOS levels found in the standard variant. Ensure compliance with RoHS and Pb-Free requirements as specified in the ordering information section of the datasheet.

Selection Notes

Select this component when TTL-compatible input thresholds are required for interfacing with legacy 5 V logic families. The device is suitable for designs needing 3-state bus isolation with over-voltage tolerance. Consider the SC-88A footprint constraints and verify that the 8 mA source/sink current capability meets the load requirements for the intended application.

Part Context

This part belongs to the MC74VHC1G125 family of single non-inverting buffers. The GT suffix specifically denotes TTL input threshold characteristics, distinguishing it from the standard VHC CMOS threshold version. It shares the same physical package and pinout as other variants in the series but differs in input switching voltage specifications.

Replacement Considerations

MC74VHC1G125DFT2G (CMOS threshold variant)

FAQ

What is the difference between MC74VHC1GT125 and MC74VHC1G125?

The primary difference is the input threshold level; the GT variant has TTL-level input thresholds, whereas the standard variant uses CMOS-level thresholds.

Does the device support partial power down?

Yes, the device supports partial power down protection through its IOFF feature, which limits leakage currents when VCC is zero.