MC74VHC1GT125DFT1G-Q

Overview

The MC74VHC1GT125DFT1G-Q is a single non-inverting 3-state buffer from the VHC logic family, designed for operation between 2.0 V and 5.5 V. It features TTL-level input thresholds and outputs capable of sourcing or sinking 8 mA at 3.0 V. The device includes over-voltage tolerant inputs and outputs up to 5.5 V, supporting partial power-down protection via IOFF. It operates within a temperature range of -55 °C to +125 °C and is qualified under AEC-Q100 standards.

Feature Summary

• TTL-level input thresholds enable direct interfacing with 5 V circuits while operating at lower supply voltages.
• Over-voltage tolerant I/O structures protect against voltage mismatches during hot insertion or battery backup scenarios.
• IOFF feature supports partial power-down mode to prevent excessive current draw when VCC is zero.

Applications

• Automotive electronic systems requiring AEC-Q100 qualification
• Level shifting between 5 V and 3 V logic domains
• Partial power-down protection in portable devices

Procurement Notes

Verify that the specific ordering suffix matches the required automotive qualification and tape-and-reel packaging specifications. Confirm the device code corresponds to the GT variant with TTL thresholds rather than the standard G variant. Ensure compliance with RoHS and halogen-free requirements as specified in the datasheet documentation.

Selection Notes

Select this component when TTL-compatible input thresholds are necessary for driving the buffer from 5 V sources. The -Q suffix indicates suitability for applications demanding unique site control changes and PPAP capability. Consider the SC-88A package availability and ensure the 3-state output functionality aligns with bus architecture requirements.

Part Context

This part belongs to the MC74VHC1G125/1GT125 series of single-channel buffers. The GT designation specifically denotes TTL-level input thresholds, distinguishing it from the CMOS-level G variant. The -Q suffix identifies it as an automotive-grade component meeting AEC-Q100 standards and PPAP requirements for production part approval.

Replacement Considerations

MC74VHC1GT125DFT1G

FAQ

What distinguishes the MC74VHC1GT125 from the MC74VHC1G125?

The MC74VHC1GT125 features TTL-level input thresholds, whereas the MC74VHC1G125 has CMOS-level input thresholds. Both share identical output characteristics and package options.

How does the IOFF feature function?

The IOFF feature ensures that if the supply voltage (VCC) is zero, the inputs and outputs will not draw excessive current, allowing for safe partial power-down protection.