Product details


Features Buffer, Enable Pin Frequency (Max) (kHz) 400 VCCA (Min) (V) 0.8 VCCA (Max) (V) 3.6 VCCB (Min) (V) 1.65 VCCB (Max) (V) 3.6 Supply restrictions No rule Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other I2C level shifters, buffers & hubs

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other I2C level shifters, buffers & hubs


  • Two-channel bidirectional buffer
  • Integrated current source on B-side, requires no external B-side resistors
  • Ultra-low power consumption
  • No static-voltage offset, low VOL
  • I2C bus and SMBus compatible
  • Operating supply voltage range of 0.8 V to 3.6 V on A-side
  • Operating supply voltage range of 1.65 V to 3.6 V on B-side
  • Active-high repeater enable input
  • Powered-off high impedance I2C bus pins on A-side
  • Powered-off back-power protection I2C bus pins
  • Support for clock stretching and multiple master arbitration
  • Family of current source options from 0.5 mA to 3 mA

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The TCA9802 is a dual-channel bidirectional buffer intended for I2C bus and SMBus/PMBus systems. It provides bidirectional level shifting (up-translation and down-translation) between low voltages (down to 0.8 V) and higher voltages (1.65 V to 3.6 V). The TCA9802 features an internal current source on the B-side of the device, allowing the removal of external pull-up resistors on the B-side. The current source also provides an improved rise time and ultra-low power consumption.

The TCA9802 is able to provide true buffering (rather than a pass-FET solution) without using a static voltage offset or incremental offset. This means that the VOL on both the A and B sides of the TCA9802 are very low (approximately 0.2 V), helping to eliminate communication issues as a result of fixed VIL thresholds. Another key feature of the TCA9802 is that there are no power sequencing requirements, or power supply dependencies. VCCA can be greater than, less than, or equal to VCCB. This gives the system designer flexibility with how the TCA9802 is used.

The TCA9802 is part of a four device family with varying current source strengths (see the Device Comparison Table).

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Technical documentation

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Type Title Date
* Data sheet TCA9802 Level-Translating I2C Bus Buffer/Repeater datasheet (Rev. B) Feb. 13, 2020
Application note Why, When, and How to use I2C Buffers May 23, 2018
Technical article Quick fixes to common I2C headaches Apr. 24, 2017
Application note Advantages and Design Considerations of the TCA980x Family Mar. 30, 2017
User guide TCA9802 I2C Buffer Evaluation Module Mar. 21, 2017
Application note Choosing the Correct I2C Device for New Designs Sep. 07, 2016
Selection guide I2C Infographic Flyer Dec. 03, 2015
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
The TCA9802EVM evaluation module (EVM) allows the user to connect power to and buffer and translate I2C commands to the onboard slave device, TMP102. The EVM allows the designer to load and test different capacitive loading and as the option to replace a series resistor with an inductor to emulate (...)
  • Evaluate TCA980x against current level-shifters easily
  • Easily evaluate devices with different capacitance or inductance loads
  • Temperature sensor on board to evaluate reliability of communication for different loading conditions

Design tools & simulation

SCPM042.ZIP (80 KB) - IBIS Model
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

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

Ordering & quality

Information included:
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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

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