SN74CBT3257DBQR

Overview

The SN74CBT3257DBQR is a 4-bit 1-of-2 FET multiplexer/demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 4 V to 5.5 V and supports an operating temperature range from -40°C to 85°C. The device features TTL-compatible input levels, ensuring compatibility with standard logic families. Key electrical characteristics include a maximum on-state resistance (ron) of 7 Ω at VCC = 4.5 V and VI = 0 V, and a typical propagation delay (tpd) of 2.5 ns at VCC = 5 V with a 50 pF load. The package type is SSOP (DBQ) with 16 pins.

Feature Summary

• High-speed signal switching with low on-state resistance for minimal propagation delay
• TTL-compatible input levels allowing direct interface with standard logic circuits
• Bidirectional data flow capability between A and B ports controlled by OE and S inputs

Applications

• Data routing in high-speed digital systems
• Signal path selection in communication equipment
• Multiplexing applications requiring low distortion

Procurement Notes

Verify the specific ordering suffix DBQR corresponds to the SSOP-16 tape and reel packaging configuration. Confirm that the component status is listed as Production or Obsolete depending on current inventory requirements, as datasheet revisions may affect availability. Ensure compliance with RoHS standards if required by the target application environment.

Selection Notes

Select this component when a 4-channel bidirectional switch with TTL compatibility is needed. The low on-resistance makes it suitable for applications requiring minimal signal attenuation. Consider the SSOP package constraints for PCB layout. Verify that the 4 V to 5.5 V supply range matches the system power rails before integration into the design.

Part Context

This part belongs to the SN74CBT3257 family of low-voltage FET multiplexers. It shares functional similarities with other devices in the CBTCBTLV series but is specifically optimized for 5 V operation. The DBQR suffix indicates a specific shrink small-outline package variant designed for space-constrained board layouts while maintaining thermal performance.

Replacement Considerations

Direct substitutes include SN74CBT3257DBR (SSOP tube) and SN74CBT3257D (SOIC). For pin-compatible alternatives in different packages, consider SN74CBT3257PW (TSSOP) or SN74CBT3257RGY (QFN), provided the package dimensions and thermal characteristics are acceptable for the design.