M74HC126B1R

Overview

The M74HC126B1R is a high-speed CMOS quad buffer with three-state outputs, manufactured using silicon gate C2MOS technology. It operates within a wide supply voltage range of 2 V to 6 V and features symmetrical output impedance with a minimum drive capability of 6 mA for both high and low states. The device includes protection circuits against static discharge and transient excess voltage on all inputs. It supports through-hole mounting in a 14-pin DIP package and functions as a non-inverting buffer.

Feature Summary

• Quad configuration providing four independent non-inverting buffer channels
• Three-state output control allowing high-impedance isolation when disabled
• High noise immunity with input thresholds defined as a percentage of supply voltage
• Balanced propagation delays ensuring symmetrical signal timing

Applications

• Bus-oriented transmissions requiring controlled data flow
• Driving capacitive loads across multiple parallel lines
• Isolating data buses during system maintenance or reconfiguration

Procurement Notes

Verify the specific suffix B1R corresponds to the tube packaging format intended for your assembly process. Confirm that the operating temperature range aligns with your environmental requirements, as industrial variants may differ. Ensure compatibility with your PCB footprint specifications for the 14-DIP package before finalizing procurement orders.

Selection Notes

Select this component when a quad buffer with tri-state capability is required for bus management applications. It serves as a direct functional replacement for standard 74HC126 devices. Consider the 2 V to 6 V operating range to ensure compatibility with your system's logic levels and power supply constraints.

Part Context

This part belongs to the STMicroelectronics M74HC126 series of high-speed CMOS logic devices. It is designed to provide robust buffering and driving capabilities for digital systems. The series is known for its compatibility with standard TTL loads while maintaining low power consumption typical of CMOS technology.

Replacement Considerations

Direct pin-compatible substitutes include the SN74HC126 from Texas Instruments and the CD74HC126 from various manufacturers. Verify electrical characteristics such as propagation delay and output current to ensure seamless integration into existing designs.