MC74VHC1GT50DTT1

Overview

The MC74VHC1GT50DTT1 is a single-channel non-inverting buffer and CMOS logic level shifter from the VHC series, manufactured by onsemi. It features TTL-compatible input thresholds and operates within a supply voltage range of 2.0 V to 5.5 V. The device provides over-voltage tolerant inputs and outputs up to 5.5 V, enabling safe interfacing between 5 V and 3 V circuits. Key electrical parameters include a typical propagation delay of 3.5 ns at 5 V, source/sink current capability of 8 mA at 3.0 V, and low quiescent supply current. It is housed in a compact SC-88A (SOT-353) surface-mount package.

Feature Summary

• Provides TTL-compatible input thresholds for direct interfacing with LSTTL logic levels while maintaining CMOS output characteristics.
• Features over-voltage tolerant inputs and outputs rated up to 5.5 V, allowing operation in mixed-voltage environments without damage.
• Supports partial power-down protection via IOFF functionality, preventing excessive current flow when the device is powered off.
• Delivers high-speed performance with a typical propagation delay of 3.5 ns at 5 V and robust drive strength of 8 mA.

Applications

• Interfacing 5 V digital circuits with 3 V logic systems
• CMOS logic level shifting applications
• Portable and battery-powered equipment requiring low power consumption

Procurement Notes

Verify that the ordering suffix matches the required package type, specifically SC-88A for the DFT variant. Confirm RoHS compliance status as indicated by the G suffix or microdot marking. Ensure the specific date code and pin orientation align with assembly requirements. Cross-reference the full part number against the manufacturer's latest ordering information to confirm availability and shipping format specifications.

Selection Notes

Select this component when TTL-level input compatibility is required alongside CMOS output drive capabilities. The over-voltage tolerance makes it suitable for bridging different voltage domains, such as connecting 5 V peripherals to 3 V microcontrollers. Consider the SC-88A package for space-constrained designs. Evaluate the propagation delay and drive current against system timing and load requirements to ensure signal integrity.

Part Context

This device belongs to the MC74VHC1G/T50 family of advanced high-speed CMOS buffers. It shares functional similarities with the MC74VHC1G50 but differs in input threshold characteristics, offering TTL compatibility instead of standard CMOS thresholds. The family is designed for tiny footprint packages and includes variants in SC-74A, SOT-553, SOT-953, and UDFN6 configurations.

Replacement Considerations

MC74VHC1G50DFT1G: Offers identical physical packaging and pinout but utilizes CMOS input thresholds rather than TTL-compatible inputs. Verify voltage level compatibility before substitution.

FAQ

What is the difference between MC74VHC1G50 and MC74VHC1GT50?

The primary difference lies in the input thresholds. The MC74VHC1G50 has CMOS level input thresholds, while the MC74VHC1GT50 has TTL level input thresholds, making the T50 variant compatible with LSTTL inputs.

Can the MC74VHC1GT50 interface 5 V circuits to 3 V circuits?

Yes, the input structures provide protection when voltages up to 5.5 V are applied regardless of the supply voltage, allowing the device to safely interface 5 V circuits to 3 V circuits.