FST3126QSCX

Overview

The FST3126QSCX is a 4-bit bus switch manufactured by Fairchild Semiconductor, belonging to the FST logic family. It features four independent one-bit switches with separate output enable inputs (/OE). The device utilizes high-speed CMOS technology and provides TTL-compatible control inputs. It is housed in a 16-lead SSOP package (MO-150) and operates within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Provides four independent high-speed CMOS bus switches for signal routing
• Features low on-resistance to minimize propagation delay and ground bounce noise
• Includes separate output enable inputs for individual port control
• Offers flow-through mode operation with zero bounce characteristics

Applications

• High-speed data bus switching applications
• Portable equipment requiring low power consumption
• Systems utilizing TTL-compatible logic levels
• Signal isolation between different voltage domains

Procurement Notes

Verify that the specific suffix 'QSCX' corresponds to the standard commercial grade variant rather than automotive or extended temperature specifications. Confirm the package type matches the required 16-lead SSOP footprint. Ensure the manufacturer designation aligns with current ownership following industry consolidations. Check for lead-free compliance documentation if required by assembly standards.

Selection Notes

Select this component when four independent bidirectional switches are required with minimal signal distortion. The low on-resistance makes it suitable for maintaining signal integrity in high-speed digital buses. Verify that the TTL-compatible input thresholds match the driving logic levels in the design. Consider the SSOP package constraints regarding board space and thermal dissipation requirements.

Part Context

This part belongs to the FST series of bus switches, which are designed for high-speed applications. The FST3125 is the base device for this family, offering similar functionality. The FST3126 variant typically shares the same core architecture but may differ in pinout or specific electrical characteristics compared to other members of the CBT/FST/QS/5C/B series.

Replacement Considerations

The FST3125M and FST3125MX are documented base devices within the same product family. Verify pin compatibility before substitution. Other variants such as FST3125QSC share the same functional description. Cross-reference datasheets to ensure identical package dimensions and electrical parameters.