SN74CBT3306CPWR

Overview

The SN74CBT3306CPWR is a dual FET bus switch from Texas Instruments, featuring level shifting and -2 V undershoot protection. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data I/O levels from 0 V to 5.5 V. The device contains two independent 1:1 switches in an 8-TSSOP package. Key electrical characteristics include a maximum on-resistance of 14 Ω at 4 V and a propagation delay of 0.35 ns at 4 V with a 50 pF load. It functions reliably across an operating temperature range of -40 °C to +85 °C.

Feature Summary

• Integrated active undershoot protection circuitry prevents false switching during negative voltage transients down to -2 V.
• Supports bidirectional data flow with near-zero propagation delay for high-speed signal routing.
• Enables partial power-down mode via the Ioff function to prevent reverse current flow when the device is de-energized.

Applications

• High-speed data bus switching in portable consumer electronics
• Signal isolation between different voltage domains in embedded systems
• Level shifting applications requiring low insertion loss

Procurement Notes

Verify the specific suffix CPWR against the manufacturer's official documentation to confirm the TSSOP-8 package type and commercial temperature grade. Ensure the ordering part number matches the exact pinout and electrical specifications required by the design. Cross-reference the datasheet revision history for any recent manufacturing or material changes that may affect compatibility.

Selection Notes

Select this component when designing circuits that require robust protection against signal undershoot while maintaining low on-resistance for minimal signal degradation. It is suitable for interfaces where bidirectional data transfer is necessary between 5 V logic domains. Consider the thermal performance and package size constraints associated with the TSSOP-8 footprint during layout planning.

Part Context

This device belongs to the SN74CBT3306 family of dual FET bus switches. It shares functional similarities with other members like the SN74CBTD3306 series but is distinguished by its specific packaging and operational parameters defined for the standard CBT line. It serves as a critical interface element for managing signal integrity in complex digital architectures.

Replacement Considerations

SN74CBTD3306CDR

FAQ

How does the device handle negative voltage spikes?

The SN74CBT3306CPWR includes active undershoot protection that detects negative transients and ensures the switch remains off until the voltage returns to a safe level, preventing erroneous state changes.

Can this switch be used for level shifting?

Yes, the device supports level shifting capabilities, allowing it to route signals between different voltage domains effectively while maintaining signal integrity.