74FST3126QSR

Overview

The onsemi 74FST3126QSR 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. The device exhibits an extremely low typical on-resistance of 4 Ω and adds nearly zero propagation delay. It operates without introducing noise or ground bounce to the system.

Feature Summary

• Four independent 1-bit switches with separate OE control pins
• Extremely low on-resistance and negligible propagation delay
• TTL and CMOS compatible logic inputs
• Pin-for-pin compatible with QS3126, FST3126, and CBT3126

Applications

• High-speed data bus switching applications
• Portable equipment requiring low power consumption
• Battery-powered systems utilizing low-voltage operation
• Communications equipment signal routing

Procurement Notes

Verify that the ordering suffix 'QS' corresponds to the QSOP-16 package configuration. Confirm RoHS compliance status as the datasheet indicates inherent lead-free characteristics for specific packages. Ensure all control inputs are tied to valid logic levels rather than left open during operation.

Selection Notes

Select this component when designing circuits requiring minimal signal distortion and fast switching speeds. The wide operating temperature range supports diverse environmental conditions. Verify that the load capacitance aligns with the specified AC electrical characteristics to maintain performance integrity.

Part Context

This device belongs to the 74FST series of bus switches manufactured by onsemi. It serves as a direct replacement for similar devices from other manufacturers due to its pin-compatible design. The technology focuses on maintaining signal integrity while providing efficient power management in digital logic interfaces.

Replacement Considerations

The datasheet confirms pin-for-pin compatibility with the QS3126, FST3126, and CBT3126 models.