MC74VHC1GT126DFT2G-Q

Overview

The MC74VHC1GT126DFT2G-Q is a single-channel noninverting 3-state buffer 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 buffered output structures and includes protection against over-voltage up to 5.5 V regardless of the supply voltage. It supports partial power down via IOFF and offers source/sink capabilities of 8 mA at 3.0 V. The component is housed in an SC-88A package and is qualified under AEC-Q100 standards.

Feature Summary

• TTL-level input thresholds for direct interfacing with 5 V circuits
• Partial power down protection capability via IOFF support
• Over-voltage tolerant inputs and outputs up to 5.5 V
• High noise immunity with buffered 3-state output structure

Applications

• Automotive electronic systems requiring AEC-Q100 qualification
• Level shifting between 5 V and 3 V logic domains
• Bus-oriented communications and driving capacitous loads
• Clock distribution and buffering in portable devices

Procurement Notes

Verify that the ordering suffix matches the required automotive qualification status, specifically the -Q designation for AEC-Q100 compliance and PPAP capability. Confirm the package type corresponds to the SC-88A form factor. Ensure the GT variant is selected for TTL input thresholds rather than CMOS levels. Cross-reference the specific date code and manufacturing site requirements if unique control changes are mandated by the application specification.

Selection Notes

Select this component when TTL-compatible input thresholds are necessary for interfacing with legacy 5 V logic families. The -Q suffix indicates suitability for automotive environments requiring strict quality control and site-specific manufacturing. Consider the SC-88A package for space-constrained designs. Verify that the 3-state output functionality aligns with bus architecture requirements. Evaluate thermal performance based on the specific PCB layout and ambient operating conditions.

Part Context

This part belongs to the MC74VHC1G series of single-gate logic devices designed for low-voltage applications. The GT variant specifically denotes TTL input thresholds, distinguishing it from the standard VHC version which uses CMOS thresholds. The -Q suffix identifies it as an automotive-grade product meeting AEC-Q100 reliability standards. It is part of onsemi's portfolio of tiny footprint logic solutions optimized for portable and automotive electronics.

Replacement Considerations

MC74VHC1G126DFT2G-Q

FAQ

What is the difference between MC74VHC1G126 and MC74VHC1GT126?

The MC74VHC1GT126 features TTL-level input thresholds, allowing it to interface directly with 5 V circuits, whereas the MC74VHC1G126 has CMOS-level input thresholds.

Does the -Q suffix change the electrical function of the device?

No, the -Q suffix does not alter the electrical function. It indicates that the device is AEC-Q100 qualified and PPAP capable, meeting specific automotive site and control change requirements.

How does the device handle partial power down?

The device supports partial power down protection through its IOFF feature, which disables the outputs when the supply voltage is removed or during power-down states to prevent backfeeding.