SN74CB3Q3345RGYR

Overview

The SN74CB3Q3345RGYR is an automotive-grade, 8-bit FET bus switch manufactured by Texas Instruments. It operates within a supply voltage range of 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 (Ron) across the entire voltage range, enabling rail-to-rail switching with minimal propagation delay. Packaged in a 20-pin VQFN (3.5x4.5 mm) format, it supports bidirectional data flow and includes powered-off protection circuits.

Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for high reliability in vehicle environments
• Integrated charge pump mechanism ensures consistent low on-resistance for efficient signal transmission
• 5-V tolerant input/output capability allows safe interfacing with diverse logic voltage levels
• Powered-off protection circuitry prevents current backflow during partial power-down scenarios

Applications

• High-speed data buses in automotive infotainment systems
• Mobile communication devices requiring low-power signal routing
• Network infrastructure equipment utilizing dense data interfaces
• Data-intensive computing systems needing fast signal switching

Procurement Notes

Verify that the specific suffix 'RGYR' corresponds to the required 20-VQFN package variant and tape-and-reel quantity. Confirm AEC-Q100 certification status if automotive compliance is mandatory for the target application. Ensure compatibility with the system's operating temperature range of -40°C to 85°C. Cross-reference the manufacturer datasheet for exact pinout and thermal specifications before finalizing procurement orders.

Selection Notes

Select this component when designing systems that require robust signal switching under varying voltage conditions. The 5-V tolerance makes it suitable for bridging different logic domains without additional level shifters. Consider the low capacitance and high bandwidth for applications sensitive to signal integrity and speed. Verify that the VQFN package fits the available PCB real estate and thermal management constraints.

Part Context

This part belongs to the SN74CB3Q series, which represents Texas Instruments' automotive-qualified line of low-voltage bus switches. Unlike standard commercial variants, these components are engineered to withstand the rigorous environmental and reliability demands of automotive electronics. The series emphasizes low power consumption and high-speed performance for modern vehicle electronic architectures.

Replacement Considerations

SN74CB3Q3345RGWR

FAQ

Does the SN74CB3Q3345RGYR support bidirectional data transfer?

Yes, the device functions as an 8-bit bus switch allowing bidirectional data flow between port A and port B when enabled.

What is the maximum operating voltage for the I/O ports?

The I/O ports are 5-V tolerant, allowing them to interface with signals up to 5 V even when the device supply voltage is lower.