74FST3125DR2

Overview

The onsemi 74FST3125DR2 is a quad, high-performance bus switch designed for CMOS and TTL compatibility within a 4.0 V to 5.5 V supply voltage range. It features four independent 1-bit switches with separate Output/Enable (OE) pins that connect Port A to Port B when OE is low, or enter a high-impedance state when OE is high. The device exhibits extremely low on-resistance and nearly zero propagation delay, adding no noise or ground bounce to the system.

Feature Summary

• Four independent 1-bit switches with separate control inputs
• Extremely low on-resistance and negligible propagation delay
• No circuit bounce or added noise to the system
• Control inputs are compatible with both TTL and CMOS logic levels

Applications

• High-speed data routing in digital systems
• Bus switching applications requiring minimal signal distortion
• Portable equipment utilizing battery-powered logic circuits

Procurement Notes

Verify the specific package suffix against the datasheet ordering information to ensure correct shipping configuration. Confirm that the component meets the required operating temperature range of -40°C to +85°C. Ensure all unused control inputs are tied to a valid logic level during implementation to prevent undefined states.

Selection Notes

Select this component for applications demanding high-speed switching with minimal signal degradation. It serves as a pin-for-pin compatible alternative to QS3125, FST3125, and CBT3125 devices. Consider the SOIC-14 package availability for standard surface-mount assembly requirements.

Part Context

This device belongs to the 74FST logic family, which provides high-speed performance comparable to other fast switching technologies. It is manufactured by Semiconductor Components Industries, LLC (onsemi). The part number indicates a Tape & Reel shipping configuration for the SOIC-14 package variant.

Replacement Considerations

Public confirmed substitutes include QS3125, FST3125, and CBT3125.