Part Number: PCA9306FMUTCG

Manufacturer: onsemi

Description: Translation – Voltage Levels Dual Bidirectional I2C Bus

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of PCA9306FMUTCG

Datasheet  PCA9306FMUTCG datasheet
Category Integrated Circuits (ICs)
Family Logic – Translators, Level Shifters
Manufacturer ON Semiconductor
Packaging Tape & Reel (TR)
Part Status Active
Translator Type Voltage Level
Channel Type Bidirectional
Number of Circuits 1
Channels per Circuit 1
Voltage – VCCA 1 V ~ 3.6 V
Voltage – VCCB 1.8 V ~ 5.5 V
Input Signal
Output Signal
Output Type Open Drain
Data Rate
Operating Temperature -55°C ~ 125°C (TA)
Features Auto-Direction Sensing
Mounting Type Surface Mount
Package / Case 8-UFDFN
Supplier Device Package 8-UDFN (1.45×1)

PCA9306FMUTCG Description

The PCA9306 is a dual bidirectional voltage-level translator that may be used with the I2C bus and the SMBus. It also has an enable (EN) input.

PCA9306FMUTCG Features

  • A 2-bit bidirectional translator with SDA and SCL lines on a mixed-mode I2C bus.
  • Available in Normal, Fast, and Super-Fast I2C and SMBus Modes.
  • Standard-Mode and Fast-Mode I2C-Bus Devices, as well as Multiple Masters, Can All Operate with a Maximum Propagation Delay of Fewer Than 1.5 ns.
  • Offers Voltage Conversion in Both Directions without a Dedicated “Direction” Pin.
  • If you connect your input and output ports in an ON state, you’ll experience less signal distortion.
  • Interfaces for the I2C Bus that Drain Data Openly (SCL1, SDA1, SCL2, and SDA2).
  • Mixed-Mode Signal Support via 5 V Tolerant I2C-Bus I/O Ports.
  • With EN set to LOW, the SCL1, SDA1, SCL2, and SDA2 pins will have high resistance.
  • NonLocked Down Functioning.
  • Facilitate PCB Trace Routing with a Flow-Through Pinout.

PCA9306FMUTCG Function Description

The PCA9306 is a voltage level translator with an enable (EN) input, which allows it to function between 1.0 V and 3.6 V (Vref(1)) and 1.8 V and 5.5 V (Vbias(ref)(2)). The PCA9306 can convert voltages in either direction between 1.0 V and 5 V without the need for a direction pin. The switch’s low on-state resistance (Ron) enables fast connection establishment and negligible propagation delay. The active translator switch allows bidirectional data transfer across ports when EN is HIGH. This occurs because SCL1 and SDA1 I/O are connected to SCL2 and SDA2 I/O, respectively.

A high-impedance state across ports indicates that the translator switch is OFF when EN is LOW. When both bus ends are linked, the PCA9306 does not act as a bus buffer by translating levels or isolating capacitance. The PCA9306 only acts as a voltage-level translator and an isolation device when both sides are active.

The PCA9306 can power two separate buses, one of which can operate at 400 kHz while the other can run at 100 kHz. When one of the buses needs to function at 400 kHz while the other is set at 100 kHz, the 100 kHz bus must be taken offline. Despite the master’s 400 kHz speed, the system’s maximum operating frequency may be lower due to translation delays. As with a regular I2C bus, the translator’s bus requires pull-up resistors to achieve high logic levels. The I2C bus on the PCA9306 is set up in the typical open-collector fashion. Each side of the translator needs a pull-up resistor, the size of which will vary depending on the system. This device is compatible with SMBus devices and those that use the I2C bus in Standard mode, Fast mode, or Fast mode Plus.

The RC time constant determines the upper-frequency limit, but in most cases, > 2 MHz is possible. The clamp is ON when either the SDA1 or SDA2 port is LOW due to a low resistance connection. When SDA2 is HIGH, the voltage on SDA1 cannot exceed VREF1. This is because the higher voltage is assumed to be on SDA2. When the SDA1 port is HIGH, the pull-up resistors connect the SDA2 port to the drain pull-up supply voltage, or Vpu(D). This feature eliminates the requirement for directional control, allowing for a smooth translation between the user-selected higher and lower voltages.

The SDA1/SDA2 channel can be considered a particular case of the SCL1/SCL2 channel. There is little to no variation in voltage or propagation latency between any two outputs, and all media share the same electrical characteristics. Since the switch can be made symmetrically, it is preferable to discrete transistor voltage translation alternatives. The translator is great for preventing damage from electrostatic discharge (ESD) to low-voltage devices, and it also protects devices with a lesser resistance to ESD.

Bidirectional Translation

The EN input must be connected to VREF2, and both pins must be pulled to the HIGH side of Vpu(D) using a pull-up resistor to execute the bidirectional clamping arrangement (higher voltage to lower voltage or lower voltage to higher voltage). That’s a prereq for the clamping understanding to work in both directions (typically 200 k). The EN input can now be regulated via VREF2. A filter capacitor connected to VREF2 is recommended. Pull-up resistors may be necessary to connect the SCL2 and SDA2 outputs of the device to Vpu(D), depending on whether the I2C bus master’s output is a totem pole or an open drain.

In contrast, if either output is a totem pole, the data must flow in only one direction, or the outputs must be able to take on one of three possible states and be governed by a direction-control mechanism. This avoids contentions between HIGH and LOW levels in either direction. If both outputs are open-drain, there is no requirement for direction control. The power supply voltage for the CPU core is linked to the reference supply voltage, which is denoted by Vref(1). The maximum voltage at the output of SCL1 and SDA1 is equal to VREF1, and the maximum voltage at the work of SCL2 and SDA2 is equal to Vpu when Vref(1) is set between 1.0 V and (Vpu(D) 1 V and VREF2 is connected to a power supply ranging from 3.3 V to 5.5 V Vpu(D). Connection of the VREF2 resistor to the power (D).


The ON Semiconductor PCA9306FMUTCG level translator is the device you need if your microprocessor-based circuit requires the translation of voltage levels. This stage changer can work in temperatures ranging from -55 to 125 degrees Celsius. The goods will be protected in transit by tape and reel packaging, and components can be easily installed after arrival. Standard supply voltages for this device are 1.8, 2.5, 3.3, and 5 V. It requires a power supply of at least 0 V to function and can run on voltages up to 5.5 V.

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