PCA9306 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments PCA9306 is a dual bidirectional I2C and SMBus voltage level translator supporting 1.0 V to 3.6 V on one side and 1.8 V to 5.5 V on the other. It handles data rates up to 400 kHz Fast-mode and passes interrupts without glitches. Packaged in 8-pin SSOP for compact board layouts.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- PCA9306 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual bidirectional I2C/SMBus translation between 1.0 V to 3.6 V and 1.8 V to 5.5 V rails
- Supports Standard (100 kHz), Fast (400 kHz), and Fast-Plus (1 MHz) I2C modes
- Open-drain architecture with no direction-control pin required for true plug-and-play level shifting
- Ultra-low quiescent current under 10 µA suitable for battery-powered applications
Applications
PCA9306 is designed for mixed-voltage I2C buses found in microcontroller systems where a 3.3 V host communicates with 1.8 V sensors or 5 V peripherals. It enables seamless integration of modern low-voltage sensors with legacy 5 V microcontrollers in industrial and consumer electronics. The device is widely used in smartphones, tablets, IoT edge nodes, and embedded Linux single-board computers where multiple voltage domains coexist on the same I2C bus.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for PCA9306:
suggested
suggested
suggested
Frequently Asked Questions
What voltage ranges does the PCA9306 translate between, and are both sides independently adjustable?
The PCA9306 translates between VREF1 (1.0 V to 3.6 V) and VREF2 (1.8 V to 5.5 V), and both reference pins are independently supplied. This lets designers connect a 1.8 V microcontroller I2C port directly to a 5 V sensor without any additional discrete components, supporting Standard and Fast modes up to 400 kHz.
How does the PCA9306 handle bidirectional data flow without a direction-control signal?
The PCA9306 uses an open-drain pass-gate topology that automatically detects current flow direction based on which side drives low first. No OE or DIR pin is needed; the device passes SCL and SDA signals bidirectionally at up to 400 kHz Fast mode and 1 MHz Fast-Plus mode with propagation delays under 10 ns.
In which compact embedded designs is the PCA9306 preferred over discrete FET-based level shifters?
For designs requiring both SCL and SDA shifting in an 8-pin SSOP footprint smaller than 5 mm x 4 mm, the PCA9306 is preferred because it integrates two fully compliant I2C channels with guaranteed 400 kHz operation and below 10 µA standby current. Discrete FET solutions typically require 4 components per channel, consuming four times the PCB area.
What is the maximum data rate supported by the PCA9306 and how does it compare to standard I2C specifications?
The PCA9306 supports up to 1 MHz Fast-Plus I2C mode, exceeding the basic 100 kHz Standard mode and 400 kHz Fast mode defined in the original I2C specification. This 1 MHz capability allows faster sensor polling cycles in systems like industrial PLCs with multiple 1.8 V sensors connected to a 3.3 V host processor.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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