SN74CBT3257DBQRG4

Overview

The SN74CBT3257DBQRG4 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 utilizes a DBQ package with 16 pins. Key electrical characteristics include a typical on-state resistance (ron) of 14 Ω at VCC = 4 V and 10 Ω at VCC = 4.5 V. Propagation delay (tpd) ranges from 0.25 ns to 0.35 ns depending on the supply voltage.

Feature Summary

• Features low on-state resistance for minimal propagation delay connections between ports.
• Provides TTL-compatible input levels for control signals.
• Utilizes Output-enable (OE) and Select-control (S) inputs to manage data routing.

Applications

• High-speed signal switching applications
• Data bus exchange circuits
• Multiplexing and demultiplexing operations

Procurement Notes

Verify the specific ordering suffix 'RG4' against current Texas Instruments documentation, as it typically denotes lead-free and RoHS-compliant materials. Confirm that the DBQ package designation matches the required shrink small-outline footprint. Ensure compatibility with the specified 4 V to 5.5 V supply voltage range for your target application environment.

Selection Notes

Select this component when a 4-bit bidirectional switch with TTL-compatible logic levels is required. The DBQ package offers a compact form factor suitable for space-constrained designs. Consider the 14 Ω to 15 Ω on-state resistance for signal integrity requirements. Verify that the operating temperature range of -40°C to 85°C meets environmental specifications.

Part Context

This part belongs to the SN74CBT3257 family of high-speed FET multiplexers. The 'DBQR' suffix indicates a tape and reel packaging format in the SSOP (QSOP) variant. The 'RG4' suffix generally signifies environmental compliance features such as lead-free construction. This series is designed for applications requiring fast switching speeds and low power consumption.

Replacement Considerations

Check for direct pin-to-pin replacements within the same logic family. Verify if alternative packages like SOIC or TSSOP variants are available if physical mounting constraints differ. Ensure any substitute maintains the 4-bit configuration and TTL-compatible input thresholds.