PCA9306DCTR

Translators, Level Shifters Overview

The PCA9306DCTR is a dual bidirectional I2C-bus and SMBus voltage-level translator manufactured by Texas Instruments. It operates with VCCA ranging from 1.2 V to 3.3 V and VCCB from 1.8 V to 5.5 V, enabling translation between 1.0 V and 5 V without direction pins. The device features an enable input, low on-state resistance for minimal propagation delay (typically 1.2 ns), and supports standard, fast, and fast-mode plus I2C protocols. Packaged in an SM-8 surface-mount case, it functions within a temperature range of -40°C to +85°C.

Translators, Level Shifters Feature Summary

• Dual bidirectional voltage translation capability for I2C and SMBus interfaces without requiring explicit direction control pins
• Automatic direction detection enabled by low on-state resistance switches connecting ports when the enable signal is active
• Supports mixed operating frequencies allowing simultaneous connection of 100 kHz and 400 kHz buses under specific isolation conditions

Translators, Level Shifters Applications

• Interfacing low-voltage microcontrollers with higher-voltage I2C peripherals
• SMBus system level translation between different voltage domains
• Connecting mixed-speed I2C buses where one side operates at 100 kHz and the other at 400 kHz

Translators, Level Shifters Procurement Notes

Verify the package type matches the design requirement, as the DCTR suffix indicates the SM-8 package variant. Confirm the enable pin configuration aligns with the system logic levels. Ensure pull-up resistors are present on both bus sides for proper high-level output. Check RoHS compliance status if required by environmental regulations.

Translators, Level Shifters Selection Notes

Select this component when bidirectional translation between 1.2 V–3.3 V and 1.8 V–5.5 V domains is needed without complex direction control. It is suitable for applications requiring low propagation delay and support for multiple I2C speed modes. Consider the SM-8 package constraints for PCB layout and thermal management requirements.

Translators, Level Shifters Part Context

This part belongs to the PCA9306 series of voltage translators. Unlike bus buffers such as the PCA9509, it does not physically isolate capacitance while active but only isolates when disabled. It provides direct level shifting for standard I2C devices, requiring external pull-up resistors on each side of the translator to function correctly.

Translators, Level Shifters Replacement Considerations

PCA9306DCTT is a parameter-equivalent alternative available in the same family.