74FST3253QSR

Overview

The onsemi 74FST3253QSR is a dual 4:1 multiplexer/demultiplexer bus switch manufactured in the QSOP-16 package. It operates within a supply voltage range of 4.0 V to 5.5 V and supports an operating temperature range of -40°C to +85°C. The device features a typical on-resistance (RON) of 4 Ω at 4.5 V, with a maximum propagation delay of 0.25 ns from bus to bus. Quiescent supply current is typically 3 µA.

Feature Summary

• Dual 4:1 multiplexer/demultiplexer architecture
• Extremely low on-resistance for minimal signal loss
• Nearly zero propagation delay
• TTL/CMOS compatible control inputs

Applications

• High-speed data routing
• Bus switching applications
• Multiplexing signal paths

Procurement Notes

Verify that the 'Q' suffix indicates automotive qualification requirements specific to this variant. Confirm the QSOP-16 package dimensions match your PCB footprint constraints. Ensure the operating temperature range meets your system's thermal specifications.

Selection Notes

Select this component when a dual 4:1 mux/demux is required with high-speed performance. The FST logic family ensures compatibility with TTL and CMOS interfaces. Consider the low RON for maintaining signal integrity across the switch.

Part Context

This part belongs to the 74FST logic family, designed for high-performance bus switching. It is pin-for-pin compatible with other industry-standard devices like the QS3253 and CBT3253, facilitating direct replacements in existing designs.

Replacement Considerations

Pin-for-pin compatible substitutes include the QS3253, FST3253, and CBT3253.