74FST3126DR2

Overview

The onsemi 74FST3126DR2 is a quad, high-performance bus switch IC 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 high, or enter a high-impedance state when OE is low. The device exhibits an extremely low typical on-resistance of 4 ohms and adds nearly zero propagation delay, ensuring minimal signal distortion.

Feature Summary

• Four independent 1-bit switches with separate control inputs
• TTL and CMOS compatible logic levels
• Low on-resistance with negligible propagation delay
• High-impedance output state upon enable deactivation

Applications

• Data bus switching applications
• Signal routing in digital systems
• Multiplexing and demultiplexing circuits

Procurement Notes

Verify the specific DR2 suffix indicates tape and reel packaging containing 2500 units per reel. Confirm RoHS compliance status and moisture sensitivity level requirements prior to ordering. Ensure the selected package variant matches the intended PCB footprint and assembly process specifications.

Selection Notes

Select this component for designs requiring fast, low-distortion signal path switching between multiple data lines. The independent enable controls allow precise management of individual bus segments. Verify that the operating temperature range meets the environmental constraints of the target application.

Part Context

This part belongs to the 74FST series of high-speed bus switches manufactured by onsemi. It serves as a direct pin-for-pin replacement for similar devices from other manufacturers, facilitating design upgrades where lower resistance and faster switching speeds are required without altering the physical board layout.

Replacement Considerations

The datasheet confirms pin-for-pin compatibility with QS3126, FST3126, and CBT3126 devices. These parts can be substituted directly if electrical characteristics align with system requirements.