MC74VHC1G125DBVT1G

Overview

The MC74VHC1G125DBVT1G is a single non-inverting 3-state buffer from the VHC logic family, manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 5.5 V and features CMOS-level input thresholds. The device provides high noise immunity through its buffered three-stage internal circuit and includes over-voltage tolerant inputs and outputs up to 5.5 V. It supports partial power down protection via IOFF functionality and offers source/sink currents of 8 mA at 3.0 V. Packaged in the SC-74A (SOT-23-5) format, it is designed for applications requiring interface between 5 V and 3 V circuits.

Feature Summary

• Provides single-channel non-inverting buffering with 3-state output control
• Features over-voltage tolerant inputs and outputs compatible with 5.5 V signals regardless of supply voltage
• Supports partial power down protection to prevent device destruction during hot insertion or battery backup scenarios

Applications

• Interface bridging between 5 V and 3 V logic circuits
• Clock distribution and signal buffering in portable electronics
• Memory address/data bus driving in consumer devices

Procurement Notes

Verify the specific ordering suffix 'DBVT1G' corresponds to the SC-74A package and tape & reel shipping configuration. Confirm that the 'T1G' suffix indicates standard RoHS compliance and Pb-free construction as defined in the manufacturer's ordering information. Ensure the application environment remains within the specified -55°C to +125°C operating temperature range.

Selection Notes

Select this component when a compact single-buffer solution with 3-state capability is required for low-voltage digital systems. The VHC series offers faster propagation delays compared to standard HC logic while maintaining CMOS compatibility. Consider the SC-74A package dimensions for PCB layout constraints and verify that the 8 mA drive current meets the load requirements of the destination circuitry.

Part Context

This part belongs to the MC74VHC1G125/1GT125 family of single buffers. The '125' designation specifically denotes CMOS input thresholds, distinguishing it from the '1GT125' variant which utilizes TTL-compatible thresholds. Both variants share identical electrical characteristics and packaging options, differing only in input threshold voltage specifications.

Replacement Considerations

MC74VHC1G125DFT1G

FAQ

What is the difference between the MC74VHC1G125 and MC74VHC1GT125?

The primary difference lies in their input threshold voltages. The MC74VHC1G125 uses CMOS-level input thresholds, whereas the MC74VHC1GT125 uses TTL-level input thresholds. All other electrical characteristics and pinouts remain identical.

How does the IOFF feature benefit the circuit?

The IOFF feature ensures that when the device is powered down (VCC = 0 V), the outputs enter a high-impedance state. This prevents back-driving of the power supply and protects the device from damage caused by voltage mismatches during hot insertion or battery backup operations.