SN74CB3Q3345PWR

Overview

The SN74CB3Q3345PWR is an automotive-grade, 8-bit FET bus switch manufactured by Texas Instruments. It operates on a single power supply ranging from 2.3 V to 3.6 V and features 5-V tolerant I/O ports. The device utilizes a charge pump to maintain low and flat on-resistance across the full voltage range, supporting rail-to-rail switching. It offers high bandwidth up to 500 MHz and minimal propagation delay of approximately 0.12 ns to 0.2 ns. Packaged in a 20-TSSOP format, it is designed for high-speed data transmission applications.

Feature Summary

• Automotive-grade reliability compliant with AEC-Q100 standards
• Charge pump technology ensures low and flat on-resistance
• Supports 5-V tolerant I/O signals regardless of supply state
• Enables partial power-down mode via dedicated Ioff circuitry

Applications

• High-speed data buses in automotive infotainment systems
• Portable devices requiring low-power signal routing
• Broadband communication equipment interfaces
• Data-intensive computing system I/O ports

Procurement Notes

Verify that the specific part number suffix matches the required package type and tape-and-reel specifications. Confirm compliance with RoHS directives and REACH regulations as stated in the official datasheet. Ensure the component meets AEC-Q100 automotive qualification requirements if intended for vehicle integration. Cross-reference ordering information directly with Texas Instruments documentation to avoid substitution errors.

Selection Notes

Select this component when designing circuits that require robust signal switching under varying voltage conditions. The 5-V tolerance allows interfacing between different logic levels without additional level shifters. The low capacitance minimizes signal distortion, making it suitable for high-frequency applications. Verify that the operating temperature range aligns with the environmental constraints of the target deployment scenario.

Part Context

This device belongs to the SN74CB3Q series, which represents Texas Instruments' automotive-qualified logic switches. Unlike standard commercial variants, this series undergoes rigorous testing to ensure longevity and performance stability in harsh automotive environments. It shares functional similarities with other CB3T and CBT series members but distinguishes itself through its specific automotive certification and optimized low-voltage characteristics.

Replacement Considerations

SN74CB3Q3345RGYR: Alternative package variant (VQFN-20) with identical electrical specifications.