FSTD3125QSCX

Overview

The FSTD3125QSCX is a 4-bit bus switch with level shifting capabilities manufactured by Fairchild Semiconductor. It operates within an extended temperature range of -40°C to 85°C and utilizes a 16-pin SSOP package (MO-153, 4mm wide). The device provides four high-speed CMOS TTL-compatible bus switches with separate output enable inputs. It features low on-resistance for minimal propagation delay and reduced ground bounce noise.

Feature Summary

• Provides four independent one-bit switches with separate control inputs
• Enables connection between two ports with minimal propagation delay
• Supports level shifting functionality for mixed voltage domains

Applications

• Connecting buses operating at different voltage levels
• High-speed data routing in digital systems
• Signal isolation between logic families

Procurement Notes

Verify the specific suffix QSCX against the manufacturer's current ordering guide to confirm package dimensions and tape-and-reel specifications. Ensure the component meets RoHS compliance standards as indicated in the datasheet documentation. Cross-reference the manufacturing date code with project requirements to guarantee material availability and consistency.

Selection Notes

Select this component when bidirectional level shifting is required for four signal lines simultaneously. The device is suitable for applications needing low on-resistance to maintain signal integrity across voltage boundaries. Verify that the input voltage levels are compatible with the specified TTL compatibility range before integration into the circuit design.

Part Context

This part belongs to the FST series of digital bus switches from Fairchild Semiconductor. It shares functional similarities with other members of the family but includes specific level-shifting capabilities not present in standard bus switches like the FST3125. The QSCX designation indicates a specific packaging and shipping configuration within the product line.

Replacement Considerations

Direct substitutes include the FSTD3125M or FSTD3125MX from Fairchild/ON Semiconductor. Verify pinout compatibility and electrical characteristics before substitution.