FST3125QSCX

Overview

The FST3125QSCX is a digital bus switch integrated circuit manufactured by Fairchild Semiconductor. It provides four high-speed CMOS TTL-compatible bus switches in a 16-pin SSOP package. The device features low on-resistance, minimal propagation delay, and low supply current. It operates within an ambient temperature range of -40°C to +85°C.

Feature Summary

• Provides four independent one-bit switches with separate output enable inputs for flexible port control
• Low on-resistance allows direct connection between ports without adding propagation delay or ground bounce noise
• Control inputs are compatible with TTL logic levels
• Ensures zero bounce operation in flow-through mode

Applications

• Computer bus switching applications
• System isolation and protection during live insertion events
• Voltage translation between 5V and 3.3V domains

Procurement Notes

Verify the specific suffix 'QSCX' against official manufacturer documentation to confirm package type and tape-and-reel configuration. Ensure the component meets RoHS compliance standards as indicated for the series. Cross-reference the part number with the original manufacturer's ordering information to validate availability and exact physical specifications.

Selection Notes

Select this component when designing circuits requiring isolated bidirectional data paths with minimal signal degradation. The device is suitable for systems needing TTL-compatible control signals and robust performance across industrial temperature ranges. Consider the SSOP package constraints for PCB layout and thermal management requirements.

Part Context

This component belongs to the FST3125 family of bus switches derived from Fairchild’s proven switch technology. The family includes variants such as the FST3125M and FST3125MX, which share similar functional characteristics but differ in packaging options like SOIC and TSSOP. All variants maintain the core four-switch architecture.