MC74VHC1GT125DFT2G-Q

Overview

The MC74VHC1GT125DFT2G-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 provides high noise immunity with stable output through a three-stage internal circuit. The device supports partial power down protection via IOFF and includes over-voltage tolerant inputs and outputs up to 5.5 V, enabling safe interfacing between 5 V and 3 V circuits. Qualified under AEC-Q100 standards, it is suitable for automotive applications requiring unique site and control change requirements.

Feature Summary

• TTL-level input thresholds enable direct interfacing with 5 V logic systems while operating at lower supply voltages.
• Over-voltage tolerant inputs and outputs protect against voltage mismatches during hot insertion or battery backup scenarios.
• IOFF feature ensures partial power down protection by limiting leakage currents when the device is powered off.
• AEC-Q100 qualification and PPAP capability support deployment in automotive and other demanding environments.

Applications

• Automotive electronic systems requiring qualified components
• Interfacing 5 V logic circuits with 3 V logic circuits
• Battery backup systems where voltage mismatch protection is required

Procurement Notes

Verify that the part number suffix -Q indicates AEC-Q100 qualification and PPAP capability as specified in the datasheet. Confirm the SC-88A package type matches your board design requirements. Ensure compliance with RoHS and halogen-free specifications if mandated by your project standards. Cross-reference the ordering information table to validate tape and reel quantities and pin orientation details before finalizing procurement.

Selection Notes

Select this component when TTL-level input compatibility is necessary within a VHC logic family application. The device is appropriate for designs requiring robust protection against over-voltage conditions on both inputs and outputs. Consider its small footprint packages if space constraints are critical. Verify that the operating temperature range of -55 °C to +125 °C meets your environmental requirements.

Part Context

This component belongs to the MC74VHC1G125/MC74VHC1GT125 series of single non-inverting 3-state buffers. The GT variant specifically denotes TTL-level input thresholds, distinguishing it from the standard CMOS-level input version. The -Q suffix signifies automotive qualification, while the DF2G suffix indicates the SC-88A package with specific shipping configuration.

Replacement Considerations

MC74VHC1GT125DFT1G-Q serves as a functional substitute with identical electrical characteristics but potentially different pin orientation or shipping configuration. Standard commercial versions like MC74VHC1GT125DFT2G lack the automotive qualification and may not meet specific site control requirements.

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 the same 3-state buffer functionality and package options.

How does the IOFF feature benefit the circuit?

The IOFF feature supports partial power down protection by limiting output leakage currents when the device is in a powered-off state, preventing back-powering of downstream components.

Is the device suitable for hot insertion applications?

Yes, the over-voltage tolerant input and output structures provide protection against voltage mismatches, making the device suitable for hot insertion scenarios without risk of destruction.