Part Number: PCA9306DCTR

Manufacturer: Texas Instruments

Description: IC Translator Bidirectional SM8

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Technical Specifications of PCA9306DCTR

Datasheet  PCA9306DCTR datasheet
Category Integrated Circuits (ICs)
Family Logic – Translators, Level Shifters
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Translator Type Voltage Level
Channel Type Bidirectional
Number of Circuits 1
Channels per Circuit 2
Voltage – VCCA 1.2 V ~ 3.3 V
Voltage – VCCB 1.8 V ~ 5.5 V
Input Signal
Output Signal
Output Type Open Drain, Push-Pull
Data Rate
Operating Temperature -40°C ~ 85°C (TA)
Features Auto-Direction Sensing
Mounting Type Surface Mount
Package / Case 8-LSSOP, 8-MSOP (0.110″, 2.80mm Width)
Supplier Device Package SM8

PCA9306DCTR Introduction

Welcome to the world of electronic circuits, where it’s important to have exact control and a good way to convert voltages. In this fast-paced technological age, the Texas Instruments PCA9306DCTR level translator stands out as a reliable partner for making sure that different voltage domains work together smoothly. This component has a lot of great features and works well. It opens up a lot of design options for electronics. Let’s learn more about the PCA9306DCTR level translator, from the wide range of temperatures it can work in to the way it’s packaged.

PCA9306DCTR Description

The PCA9306 is a voltage-level adapter that works with both I2C and SMBus. At the VREF1 input (EN), it can work with voltages from 1.2 V to 3.3 V, and at the VREF2 input (VREF), it can work with voltages from 1.8 V to 5.5 V. Without a direction pin, the PCA9306 component can translate voltages between 1.2 V and 5 V either way. Thanks to the switch’s low RON (on-state resistance), connections can be made quickly and with little delay. When EN is high, the translation is turned on (ON). Thanks to this link, data can now move both ways between the SCL1 and SDA1 I/O and the SCL2 and SDA2 I/O. When EN is at its lowest setting, the translator switch is turned off, and there is a lot of resistance between the ports. The PCA9306 is a voltage converter that can also separate 100-kilohertz and 400-kilohertz lines. To do this, use the EN pin to turn off the slower bus when connecting in fast mode.

PCA9306DCTR Detailed Description

The PCA9306 is a voltage-level translator for I2C and SMBus that works in both directions. It doesn’t need a direction pin and has an enable (EN) input. It also has a switch-on port (EN). VREF1 can be powered by a voltage between 1.2 V and 3.3 V, while VREF2 can be powered by a voltage between 1.8 V and 5.5 V. Also, the PCA9306 component can be used to run two different buses, one with a frequency of 400 kHz and the other with a frequency of 100 kHz.

If the two buses are running at different speeds, the EN bit needs to be used to disconnect the 100-kHz bus from the 400-kHz main bus. When the two buses are running at different speeds, this is important. Because the level shifter adds delays, the highest operating frequency of the system may be lower than 400 kHz, even if the controller is working at the higher frequency of 400 kHz. The capacitance of an I2C bus, which can’t be more than 400 pF, determines how many devices can be attached to it. When estimating the system’s total load, the PCA9306 device’s capacitive load must be considered.

This is done to make sure that the capacitance of both sides is less than 400 pF when added together. Voltage or transmission delay changes very little from one output to the next, and the SDA and SCL channels of the PCA9306 device, which are both part of the same device, have the same electrical properties. Since the switch can be built in a symmetrical way, it has a number of advantages over voltage-translation systems that use discrete transistors.

The translator protects electronics that are less resistant to electrostatic discharge (ESD) better than other devices that work at lower voltages. At the same time, it protects electronics that work at higher voltages.

PCA9306DCTR Application Information

● General Applications of I2C

Pullup resistors are needed on the translator bus, just like they are on the normal I2C system, to make sure that the logic-high levels are set. The setup determines the size of these pullup resistors, but there must be one on each side of the repeater. The device is made to work with I2C devices in both normal and fast modes, as well as SMBus devices. In a generic I2C system, where standard-mode devices and multiple processors can both work, only 3 mA is specified for standard-mode devices. There are times when you can use high-end currents.

The pullup resistors connect the SDA2 port to the pullup source voltage of the drain (VDPU). This feature makes it possible for the user to switch between higher and lower voltages without having to control the direction. The SDA1-SDA2 channel and the SCL1-SCL2 channel both do the same thing.

Power Supply Recommendations

The VREF1 pin on the PCA9306 can be connected straight to a power supply to give it power. A 200-k resistor must be used to connect the VREF2 pin to the VDPU power source. The gadget will drain too much power and perform less reliably without a high-impedance resistor between VREF2 and VDPU.


Layout Guidelines For the PCA9306 device’s printed circuit board (PCB) layout, you should follow standard PCB layout practices. However, for I2C signal speeds, you don’t need to worry about high-speed data transfer issues like matching impedances and differential pairs. In all PCB layouts, it is best to keep signal traces from meeting at right angles, to spread signal traces out when they leave the area of an integrated circuit (IC), and to use thicker trace widths for power and ground traces, which often carry more current. Place the 100-pF filter capacitor as close as possible to VREF2. You can also use a bigger decoupling capacitor, but the PCA9306 device will take longer to turn on and off if the time constant of the two capacitors and the 200-k resistor is longer.


In the world of electronic systems, the Texas Instruments PCA9306DCTR level translator is a very useful tool. With its excellent voltage control and flexible working supply voltage range, it makes it easy for designers to bridge the gap between voltage domains that don’t work well together. The wide range of temperatures makes it reliable even in harsh conditions, and the tape-and-reel packaging makes it easy to carry and install. Whether you’re a beginner in electronics or a seasoned pro, the PCA9306DCTR level translator from Texas Instruments is a useful tool that makes voltage translation in your projects easy and effective. Use all of its features to open up new areas for your electronic creations.

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