SN74CBT3257RGYRG4

Overview

The SN74CBT3257RGYRG4 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 from -40°C to 85°C. The device features TTL-compatible input levels and low on-state resistance, enabling minimal propagation delay. Key electrical parameters include a typical propagation delay of 0.25 ns at 5 V and an on-state resistance (ron) of 7 Ω at VCC = 4.5 V with II = 30 mA. The component is housed in a 16-pin QFN (RGY) package.

Feature Summary

• Provides bidirectional switching between two ports for four independent data lines
• Features low on-state resistance to minimize signal propagation delay
• Supports TTL-compatible input logic levels for direct interfacing

Applications

• High-speed data routing applications requiring low latency
• Bus exchange systems utilizing TTL-compatible signaling
• Multiplexing and demultiplexing functions in digital circuits

Procurement Notes

Verify the specific ordering suffix 'G4' against current manufacturer documentation to confirm lead-free status and environmental compliance details. Confirm that the RGY package designation matches the required 16-pin QFN footprint for your PCB layout. Ensure the design accommodates the specified 4 V to 5.5 V supply voltage range and check for any recent product life cycle changes or obsolescence notices.

Selection Notes

Select this component when a 4-bit bidirectional switch with TTL compatibility is required. The low on-state resistance makes it suitable for applications prioritizing signal integrity and speed. Ensure the system power supply falls strictly within the 4 V to 5.5 V range to maintain valid logic levels and prevent damage. Verify that the 16-pin QFN package fits the available board space and thermal requirements.

Part Context

This part belongs to the SN74CBT3257 family of high-speed FET multiplexers. It shares functional characteristics with other variants in the series, such as different packaging options like SOIC or SSOP, but differs in physical dimensions and pin configuration. The RG4 suffix typically indicates specific manufacturing or environmental attributes defined by Texas Instruments.

Replacement Considerations

Check for direct replacements with identical pinouts and specifications. Variants such as SN74CBT3257RGYR may offer similar functionality in the same package. Verify that any substitute maintains the 4 V to 5.5 V operating range and TTL compatibility.