Reference: RBD-2150
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The PCA9306 Bidirectional I2C Bus/SMBus Voltage Level Converter is a versatile and compact dual-channel translator designed to bridge communication between devices operating at different voltage levels. It supports seamless bidirectional voltage translation between I2C or SMBus systems without the need for a direction control pin. Ideal for mixed-voltage applications, this module enables reliable communication across a wide voltage range—from 1.2V up to 5.5V—with minimal delay and high signal integrity.
The PCA9306 Bidirectional I2C Bus/SMBus Voltage Level Converter is a versatile and compact dual-channel translator designed to bridge communication between devices operating at different voltage levels. It supports seamless bidirectional voltage translation between I2C or SMBus systems without the need for a direction control pin. Ideal for mixed-voltage applications, this module enables reliable communication across a wide voltage range—from 1.2V up to 5.5V—with minimal delay and high signal integrity.
Whether you’re interfacing a 1.8V microcontroller with a 3.3V or 5V sensor, or isolating a slower I2C bus from a faster one, the CJMCU-9306 (PCA9306) is your go-to solution for hassle-free voltage level conversion in I2C and SMBus protocols.
Dual bidirectional channels for I2C (SCL/SDA) and SMBus lines
Wide voltage compatibility:
VREF1: 1.2V to 3.3V
VREF2: 1.8V to 5.5V
No direction pin needed – automatic bidirectional translation
Low ON-state resistance (RON): ~3.5Ω for minimal signal loss
Supports standard-mode, fast-mode, and fast-mode plus I2C devices
Supports hot-swapping and isolation by toggling the EN (Enable) pin
5V tolerant I/O ports
Ultra-fast propagation delay: <1.5ns
High-impedance state when disabled (EN = LOW)
Flow-through pinout for easy PCB routing
Robust ESD protection:
2000V HBM (Human Body Model)
1000V CDM (Charged Device Model)
| Parameter | Value |
|---|---|
| Input Voltage (VREF1) | 1.2V to 3.3V |
| Output Voltage (VREF2) | 1.8V to 5.5V |
| Supported Protocols | I2C, SMBus |
| Operating Modes | Standard, Fast, Fast-mode Plus |
| Propagation Delay | <1.5ns |
| ON-State Resistance (RON) | ~3.5Ω |
| I/O Tolerance | 5V tolerant on all ports |
| Enable Pin (EN) | Controls connection between channels |
| Protection | ESD >2000V HBM, >1000V CDM |
| Dimensions | Compact form factor for easy integration |
Voltage level translation between mixed-voltage I2C devices
Communication between 1.8V MCUs and 5V peripherals
Sensor interfaces in robotics and embedded systems
I2C/SMBus protocol level shifting for laptops, mobile devices, and industrial electronics
Isolating slow and fast I2C buses for robust communication
1 x PCA9306 Bidirectional I2C Level Converter Module (CJMCU-9306)
With automatic direction sensing, excellent signal integrity, and support for a wide voltage range, the PCA9306 is the perfect choice for interfacing modern low-voltage microcontrollers with legacy or high-voltage I2C devices. Its plug-and-play simplicity and robust ESD protection make it an essential component for safe and reliable voltage translation in both hobbyist and professional electronics projects.
Upgrade your voltage compatibility today—integrate the PCA9306 module into your I2C projects for efficient, safe, and automatic bidirectional level shifting!
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The PCA9306 Bidirectional I2C Bus/SMBus Voltage Level Converter is a versatile and compact dual-channel translator designed to bridge communication between devices operating at different voltage levels. It supports seamless bidirectional voltage translation between I2C or SMBus systems without the need for a direction control pin. Ideal for mixed-voltage applications, this module enables reliable communication across a wide voltage range—from 1.2V up to 5.5V—with minimal delay and high signal integrity.
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