74LCX125MTR

Overview

The STMicroelectronics 74LCX125MTR is a low-voltage CMOS quad bus buffer featuring three-state outputs and 5 V tolerant inputs and outputs. It operates within a supply voltage range of 2.0 V to 3.6 V and supports an operating temperature range of -40 °C to +85 °C. The device provides high-speed performance with a maximum propagation delay of 5.2 ns at 3.0 V to 3.6 V, alongside symmetrical output impedance ensuring minimum output currents of ±24 mA at 3.0 V. Packaged in a 14-SOIC format with tape and reel delivery, it includes power-down protection on all I/Os.

Feature Summary

• Features 5 V tolerant inputs and outputs for interfacing between different logic voltage domains.
• Provides high-speed signal buffering with balanced propagation delays and symmetrical output impedance.
• Includes power-down protection circuits on all inputs and outputs to prevent excessive current draw during power-off states.

Applications

• Automotive electronic systems
• Industrial control equipment
• Computer peripheral interfaces
• Consumer electronics devices

Procurement Notes

Verify the specific ordering code against the manufacturer's official documentation to ensure correct package type and temperature rating. Confirm that the procurement channel sources genuine components directly from authorized distributors or verified suppliers. Check for any recent product lifecycle updates or obsolescence notices. Ensure compliance with RoHS directives and environmental specifications required by the target application.

Selection Notes

Select this component when designing systems requiring interface buffers between 3.3 V logic and 5 V environments. Consider its low-power consumption characteristics suitable for battery-operated applications. Evaluate the SO-14 package dimensions against available PCB space constraints. Verify that the specified propagation delay meets the timing requirements of the target data bus speed.

Part Context

This part belongs to the 74LCX family of low-voltage CMOS logic devices manufactured using sub-micron silicon gate technology. It serves as a direct pin-and-function compatible replacement for older 74 series 125 buffers while offering improved speed and lower power consumption. The device is designed for general-purpose digital signal buffering in modern electronic systems.

Replacement Considerations

Direct substitutes include the 74LCX125TTR (TSSOP-14) and the automotive-grade 74LCX125YMTR variant. Cross-manufacturer equivalents such as MC74LCX125DWR2G are functionally compatible. Verify pinout compatibility and electrical characteristics before substituting.

FAQ

How does the 74LCX125MTR handle power-down conditions?

The device incorporates power-down protection on both inputs and outputs, preventing excessive current flow when the supply voltage is removed or below the operating threshold.

What is the maximum propagation delay specification?

The maximum propagation delay is 5.2 ns when operating at a supply voltage between 3.0 V and 3.6 V with a load capacitance of 50 pF.