FST3126QSC

Overview

The FST3126QSC is a 4-bit bus switch IC manufactured by onsemi, housed in a 16-lead Quarter Size Outline Package (QSOP). It operates within a supply voltage range of 4.0V to 5.5V and supports free air operating temperatures from -40°C to +85°C. The device features a maximum on-resistance of 11 Ohms at 4.0V and 250 nanoseconds propagation delay. Quiescent supply current is typically 3 µA.

Feature Summary

• Provides four high-speed CMOS TTL-compatible bus switches with low on-resistance for minimal signal distortion.
• Organized as four independent 1-bit switches with separate output enable inputs for flexible control.
• Ensures zero bounce in flow-through mode while maintaining minimal propagation delay through the switch path.

Applications

• High-speed data bus switching applications
• TTL-compatible digital circuit interfacing
• Signal routing in portable electronic devices

Procurement Notes

Verify the specific package type and suffix against official onsemi documentation before ordering. Confirm that the component meets all required environmental and electrical specifications for the intended application. Check for any recent updates to part numbering or availability status directly from the manufacturer.

Selection Notes

Select this component when designing circuits requiring low on-resistance and high-speed switching capabilities. Ensure the operating voltage and temperature ranges align with system requirements. Consider the QSOP package constraints regarding board space and thermal management during layout.

Part Context

This device belongs to the FST3126 family of 4-bit bus switches. It is part of onsemi's standard product portfolio, originally developed under Fairchild Semiconductor. The QSC suffix specifically denotes the 16-lead QSOP package variant within this series.

Replacement Considerations

Compatible alternatives include the FST3126M (SOIC package) and FST3126MTC (TSSOP package). Verify pin compatibility and package dimensions before substituting to ensure mechanical fit and electrical performance remain consistent.