74FST3251DR2

Overview

The onsemi 74FST3251DR2 is an 8:1 multiplexer/demultiplexer bus switch designed for high-performance applications. It operates within a supply voltage range of 4.0 to 5.5 volts and maintains CMOS/TTL compatibility. The device features extremely low on-resistance, typically less than 4 ohms at 4.5V, with a maximum propagation delay through the switch of 0.25 nanoseconds. It provides nearly zero standby current and eliminates circuit noise or ground bounce during operation.

Feature Summary

• Provides 8:1 multiplexing and demultiplexing capabilities via a single A port and eight B ports
• Features extremely low on-resistance and negligible propagation delay for signal integrity
• Operates with nearly zero standby current consumption
• Eliminates circuit bounce and system noise during switching operations

Applications

• High-speed data routing in digital systems
• Bus switching applications requiring minimal signal distortion
• Multiplexing control circuits compatible with TTL/CMOS logic levels

Procurement Notes

Verify the specific suffix DR2 indicates the SOIC-16 tape and reel packaging configuration. Confirm that the component meets RoHS standards if required by your assembly process. Ensure the operating temperature range of -40°C to +85°C aligns with your environmental specifications before finalizing procurement.

Selection Notes

Select this component when an 8-channel bus switch is required with strict limits on propagation delay and on-resistance. It is suitable for designs needing CMOS and TTL input compatibility across a 4.0 to 5.5 volt supply range. Consider the SOIC-16 package dimensions for PCB layout constraints.

Part Context

This part belongs to the 74FST logic family, characterized by FET-based technology for high speed and low power. The 74FST3251 specifically addresses the need for efficient bus management in complex digital architectures where signal fidelity and switching speed are critical performance indicators.

Replacement Considerations

Direct substitutes include the Nexperia CBT3257AD and Texas Instruments SN74CBT3257 series devices. Verify pinout compatibility and electrical characteristics against the original datasheet requirements before implementing any alternative components.

FAQ

What is the maximum propagation delay for the 74FST3251?

The maximum propagation delay through the switch is 0.25 nanoseconds.

Is the 74FST3251 compatible with TTL logic levels?

Yes, the control inputs are TTL/CMOS compatible when operating between 4 and 5.5 volts.