FST3257M

Overview

The FST3257M is a quad 2:1 multiplexer/demultiplexer bus switch manufactured by onsemi. It utilizes high-speed CMOS technology and maintains TTL compatibility for control inputs. The device features low on-resistance, enabling signal transmission between ports without adding propagation delay or generating excessive ground bounce noise. It operates with a single power supply and includes an active-low output enable pin to manage data flow direction.

Feature Summary

• Quad 2:1 multiplexer/demultiplexer architecture
• Low on-resistance for minimal signal degradation
• TTL-compatible control input levels
• Active-low output enable functionality

Applications

• High-speed data bus switching
• Portable battery-powered systems
• Signal routing in communication interfaces

Procurement Notes

Verify the specific suffix 'M' against the official datasheet to confirm package type and tape/reel specifications. Confirm RoHS compliance status and lead-free manufacturing details directly from the manufacturer's documentation before procurement.

Selection Notes

Select this component for applications requiring bidirectional data transfer with minimal insertion loss. Ensure the operating voltage range matches the system requirements. Verify that the low on-resistance meets the impedance matching needs of the target bus lines.

Part Context

This part belongs to the FST series of high-speed CMOS logic switches. It is designed to replace older discrete switching solutions, offering higher integration and lower power consumption. The series is commonly used in consumer electronics and industrial control systems.

Replacement Considerations

Check for direct pin-to-pin replacements within the same FST family. Verify electrical parameters such as on-resistance and propagation delay to ensure functional equivalence in the existing circuit design.