FST3253QSC

Overview

The FST3253QSC is a dual 4:1 multiplexer/demultiplexer bus switch manufactured by ON Semiconductor. It operates within a supply voltage range of 4.0V to 5.5V and supports an operating temperature from -40°C to +85°C. The device features a typical on-resistance of 4Ω at VCC=4.5V with a 64mA load, and a quiescent supply current of 3µA. Propagation delay is typically 0.25ns for bus-to-bus switching. It utilizes a 16-lead Quarter Size Outline Package (QSOP) conforming to JEDEC MO-137 standards.

Feature Summary

• Dual 4:1 high-speed CMOS multiplexer/demultiplexer architecture
• Low on-resistance switch connection between ports
• Minimal propagation delay through the switch path
• Zero bounce in flow-through mode

Applications

• Bus switching applications requiring low ground bounce noise
• High-speed data routing in TTL-compatible systems
• Multiplexing and demultiplexing signal paths

Procurement Notes

Verify the specific ordering code suffix against the manufacturer's official documentation to ensure correct package selection. Confirm that the component meets all relevant environmental compliance standards required for your specific application before finalizing procurement. Check for any recent part number updates resulting from corporate integration processes.

Selection Notes

Select this component when a dual 4:1 multiplexer configuration is required with minimal signal distortion. Ensure the system operates within the specified 4.0V to 5.5V supply voltage range. Verify that the QSOP-16 package dimensions fit the available PCB footprint and that the thermal requirements align with the -40°C to +85°C operating temperature range.

Part Context

This device belongs to the FST3253 series of bus switches. It is derived from Fairchild Semiconductor's proven switch technology, which was previously utilized in products like the 74LVX3L384. Following the integration into ON Semiconductor, some Fairchild orderable part numbers may have undergone nomenclature changes to meet new system requirements.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.