SN74CB3Q3345DBQR

Overview

The SN74CB3Q3345DBQR is an automotive-grade, 8-bit FET bus switch designed for low-voltage applications. It operates within a supply voltage range of 2.3 V to 3.6 V and features 5-V tolerant I/O ports that support signal translation across multiple logic levels including 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V. The device utilizes a charge pump to maintain a low and flat on-resistance (Ron) of typically 4 ohms, enabling rail-to-rail switching with minimal propagation delay. It offers high bandwidth up to 500 MHz and low input/output capacitance of 4 pF to reduce signal distortion.

Feature Summary

• Provides bidirectional data flow between two ports with independent output enable inputs for flexible control
• Supports partial power-down mode via Ioff circuitry to prevent current backflow during power-off states
• Features robust electrostatic discharge protection rated at 2000 V human model and 1000 V charged device model

Applications

• High-speed broadband communication systems requiring low signal distortion
• Network infrastructure equipment utilizing multi-voltage level interfaces
• Data-intensive computing systems demanding fast signal switching capabilities

Procurement Notes

Verify the specific suffix 'DBQR' corresponds to the SSOP-20 package and tape-and-reel quantity when sourcing. Confirm AEC-Q100 qualification status is required for your automotive application tier. Ensure the design supports the 2.3 V to 3.6 V supply range and accounts for the 5-V tolerant I/O characteristics for proper level shifting.

Selection Notes

Select this component for designs requiring automotive reliability combined with high-bandwidth signal integrity. The 8-bit configuration reduces board space compared to single-channel alternatives. Verify that the system can accommodate the typical 0.7 mA supply current and that the 500 MHz bandwidth meets the highest frequency requirements of the target data bus.

Part Context

This part belongs to the SN74CB3Q series, which represents Texas Instruments' automotive-grade extension of the standard CB3Q logic family. These devices are engineered to meet strict automotive quality standards while providing enhanced performance metrics such as lower on-resistance and higher bandwidth compared to legacy counterparts in the broader SN74CBT or SN74CB3 families.

Replacement Considerations

Direct replacements include other SN74CB3Q3345 variants with different package options such as SN74CB3Q3345DCKR or SN74CB3Q3345PWPR. Non-TI equivalents like the ON Semiconductor FST3345 may offer functional similarity but require verification of electrical parameters and automotive qualification compliance.