SN74CB3T3245DWR

Overview

The SN74CB3T3245DWR is an octal FET bus switch manufactured by Texas Instruments, housed in a 20-pin SOIC package. It operates with a supply voltage range of 2.3 V to 3.6 V and features bidirectional data transmission. The device includes a 5-V tolerant level shifter, allowing it to interface between low-voltage buses (2.5 V/3.3 V) and 5-V systems. Key electrical parameters include a maximum on-resistance of 8.5 Ω, a typical propagation delay of 1 ns, and an input/output continuous current rating of 128 mA. It supports an operating temperature range from -40°C to 85°C.

Feature Summary

• Provides bidirectional data transmission across eight independent channels for efficient bus management.
• Integrates a 5-V tolerant level shifter to enable seamless translation between 2.5-V/3.3-V and 5-V logic levels.
• Features powered-off protection to prevent high leakage currents when the device is unpowered.
• Offers low on-resistance to minimize signal attenuation and power loss during active transmission.

Applications

• Level shifting interfaces between 3.3-V microcontrollers and 5-V peripheral devices.
• Bidirectional bus holding and driving in memory architectures.
• Signal path translation in portable consumer electronics requiring low-voltage operation.
• Data routing in industrial control systems with mixed voltage domains.

Procurement Notes

Verify the specific suffix 'DWR' corresponds to the tape-and-reel packaging variant rather than the tube-packaged 'DW'. Confirm RoHS compliance status and lead-free designation as indicated by manufacturer documentation. Ensure the order quantity matches the reel size specifications provided in the official datasheet to avoid packaging discrepancies.

Selection Notes

Select this component when bidirectional level shifting between 3.3-V and 5-V systems is required. The integrated 5-V tolerance eliminates the need for external pull-up resistors or additional translators. Consider the 20-pin SOIC package for through-hole or surface-mount assembly depending on board layout constraints. Verify that the 8.5 Ω on-resistance meets the signal integrity requirements of the target application.

Part Context

This part belongs to the SN74CB3T3245 family of octal bus switches designed for low-voltage applications. It shares functional similarities with the SN74CBT3245 series but differs in its specific voltage tolerance and level-shifting capabilities. The CB3T series is optimized for battery-powered devices where low standby current and wide operating voltage ranges are critical for system efficiency.

Replacement Considerations

• SN74CB3T3245PW
• SN74CB3T3245DR