MC74VHC126DR2

Overview

The MC74VHC126DR2G is a quad bus buffer with 3-state control inputs, fabricated using silicon gate CMOS technology. It operates within a voltage range of 2.0 V to 5.5 V and supports an operating temperature from -55°C to +125°C. The device features high-speed operation with typical propagation delays of 3.8 ns at 5.0 V and low power dissipation. Inputs are compatible with standard CMOS levels, while outputs provide full 5.0 V swings, enabling level conversion between 3.3 V and 5.0 V systems.

Feature Summary

• High-speed operation comparable to Bipolar Schottky TTL with CMOS low power dissipation
• Active-high output enables place the output into a high impedance state when set High
• Internal circuits composed of three stages providing high noise immunity and stable output
• Input structures tolerate voltages up to 5.5 V for interfacing 5 V systems to 3 V systems

Applications

• Level conversion for interfacing 3.3 V to 5.0 V systems
• Bus buffering in digital logic circuits
• Interfacing 5 V systems to 3 V systems

Procurement Notes

Verify the specific ordering suffix 'R2' corresponds to the Tape & Reel packaging configuration as documented in the official onsemi datasheet. Confirm that the part number includes the 'G' suffix for Pb-Free compliance if required by your manufacturing specifications. Ensure the SOIC-14 package type matches your PCB footprint requirements before procurement.

Selection Notes

Select this component when a quad bus buffer with 3-state capability is needed for high-speed CMOS applications. It is suitable for designs requiring compatibility with standard CMOS input levels and full 5.0 V output swings. Consider the wide operating temperature range and low power consumption for efficient system design.

Part Context

This device belongs to the 74VHC series of high-speed CMOS logic devices. It is functionally similar to other quad bus buffers but offers specific performance characteristics such as balanced propagation delays and high noise immunity. The MC74VHC126 is designed to replace older Bipolar Schottky TTL equivalents while maintaining lower power consumption.

Replacement Considerations

The MC74VHCT126A is a pin-compatible alternative with TTL-compatible inputs. Verify input voltage compatibility if replacing with the T variant. Other manufacturers may offer equivalent parts, but functional and electrical parameters must be cross-referenced with official datasheets.