Product details


Features Enable Pin Frequency (Max) (kHz) 1000 VCCA (Min) (V) 1.65 VCCA (Max) (V) 3.6 VCCB (Min) (V) 2.3 VCCB (Max) (V) 5.5 Supply restrictions VCCA <= VCCB Rating Catalog Operating temperature range (C) -40 to 85 open-in-new Find other I2C level shifters, buffers & hubs

Package | Pins | Size

DSBGA (YZP) 8 3 mm² .928 x 1.928 SSOP (DCT) 8 8 mm² 3 x 2.8 VSSOP (DCU) 8 6 mm² 2 x 3.1 open-in-new Find other I2C level shifters, buffers & hubs


  • 2-Bit Bidirectional Translator for SDA and SCL Lines in I2C Applications
  • Provides Bidirectional Voltage Translation With No Direction Pin
  • High-Impedance Output SCL_A, SDA_A, SCL_B, SDA_B Pins When OE = Low or VCC = 0 V
  • Internal 10-kΩ Pullup Resistor on All SDA and SCL Pins
  • 1.65 V to 3.6 V on A port and 2.3 V to 5.5 V on B port (VCCA  ≤ VCCB)
  • VCC Isolation Feature: If Either VCC Input Is at GND, Both Ports Are in the High-Impedance State
  • No Power-Supply Sequencing Required: Either VCCA or VCCB Can Be Ramped First
  • Low Ioff of 2 µA When Either VCCA or VCCB = 0 V
  • OE Input Can Be Tied Directly to VCCA Or Controlled By GPIO
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • A Port
      • 2500-V Human-Body Model (A114-B)
      • 250-V Machine Model (A115-A)
      • 1500-V Charged-Device Model (C101)
    • B Port
      • 8-kV Human-Body Model (A114-B)
      • 250-V Machine Model (A115-A)
      • 1500-V Charged-Device Model (C101)

All trademarks are the property of their respective owners.

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The TCA9406 is a 2-bit bidirectional I2C and SMBus voltage-level translator with an output enable (OE) input. It is operational from 1.65 V to 3.6 V on the A-side, referenced toVCCA, and from 2.3 V to 5.5 V on the B-side, referenced to VCCB. This allows the device to interface between lower and higher logic signal levels at any of the typical 1.8-V, 2.5-V, 3.3-V, and
5-V supply rails.

The OE input pin is referenced to VCCA, can be tied directly to VCCA, but it is also 5.5-V tolerant. The OE pin can also be controlled and set to a logic low to place all the SCL and SDA pins in a high-impedance state, which significantly reduces the quiescent current consumption.

Under normal I2C and SMBus operation or other open-drain configurations, the TCA9406 can support up to 2 Mbps; therefore, it is compatible with standard I2C speeds where the frequency of SCL is 100 kHz (Standard-mode), 400 kHz (Fast-mode), or 1 MHz (Fast-mode Plus). The device can also be used as a general purpose level translator, and when the A- and B-side ports are both driven with push-pull devices the TCA9406 can support up to 24 Mbps.

The TCA9406 features internal 10-kΩ pullup resistors on SCL_A, SDA_A, SCL_B, and SDA_B. Additional external pullup resistors can be added to the bus to reduce the total pullup resistance and speed up rising edges.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet TCA9406 2-Bit Bidirectional 1-MHz, I2C Bus and SMBus Voltage-Level Translator With 8-kV HBM ESD datasheet (Rev. G) Nov. 29, 2018
User guide TCA9406 I2C Translator Evaluation Module Oct. 26, 2018
Application note Understanding the I2C Bus Jun. 30, 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters May 15, 2015
Application note I2C Bus Pull-Up Resistor Calculation Feb. 13, 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
This EVM can be used to evaluate the TCA9406 product in the DCU package. The I2C buses are easily accessed via SDA_A, SCL_A, SDA_B, and SCL_B test points, and symmetrically laid out for optimal performance. All IC signals are available through test point connections.
  • Access to the VCCA, VCCB, OE, SDA_A, SCL_A, SDA_B, and SCL_B pins
  • Footprint for a socket for evaluating multiple TCA9406 devices
  • Footprints to test different capacitive loads
  • Footprints to test different pullup resistor values
  • Different load options allow for the testing of different translator (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
I2C designer tool
I2C-DESIGNER — Use the I2C Designer tool to quickly resolve conflicts in addressing, voltage level and frequency in I2C based designs. Enter master and slave inputs to automatically generate an I2C tree or easily build a custom solution. This tool will help designers save time and comply with the I2C standard with (...)
  • GUI-based web application
  • Exportable designs
  • JSON file uploader
  • Bill of materials generator

Reference designs

Stereo Evaluation Module Reference Design of the Digital Input, Class-D, IV Sense Audio Amplifier
TIDA-01572 — This reference design provides a high-performance stereo audio subsystem for use in PC applications. It operates off a single supply, ranging from 4.5 V to 16 V, and features the TAS2770, a digital-input Class-D audio amplifier that provides excellent noise and distortion performance and is (...)
document-generic Schematic document-generic User guide
Self-Booting Audio System
TIDA-00609 The purpose of this TI Design is to provide the designer hardware and software tools that can be used as reference for audio systems. The new revision of the PurePath™ Console Motherboard (RevF) adds stand-alone, self-booting capabilities to allow making compelling demos with any EVM that is (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DSBGA (YZP) 8 View options
SM8 (DCT) 8 View options
VSSOP (DCU) 8 View options

Ordering & quality

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