Home Interface I2C, I3C & SPI ICs I2C & I3C level shifters, buffers & hubs
Home
Interface
I2C, I3C & SPI ICs
I2C & I3C level shifters, buffers & hubs

TCA9617B

ACTIVE

2-bit level-translating 1-MHz I2C/SMBus buffer/repeater with powered-off high-impedance

Order now
Data sheet

TCA9617B

ACTIVE
Data sheet Order now

Product details

Features Buffer, Enable pin Protocols I2C Frequency (max) (MHz) 1 VCCA (min) (V) 0.8 VCCA (max) (V) 5.5 VCCB (min) (V) 2.2 VCCB (max) (V) 5.5 Supply restrictions VCCA <= VCCB Rating Catalog Operating temperature range (°C) -40 to 85
Features Buffer, Enable pin Protocols I2C Frequency (max) (MHz) 1 VCCA (min) (V) 0.8 VCCA (max) (V) 5.5 VCCB (min) (V) 2.2 VCCB (max) (V) 5.5 Supply restrictions VCCA <= VCCB Rating Catalog Operating temperature range (°C) -40 to 85
VSSOP (DGK) 8 14.7 mm² (3 mm × 4.9 mm)
  • Two-channel bidirectional I2C buffer
  • Support for standard mode, fast mode (400kHz), and fast mode+ (1MHz) I2C operation
  • Operating supply voltage range of 0.8V to 5.5V on A-side
  • Operating supply voltage range of 2.2V to 5.5V on B-side
  • Voltage-level translation from 0.8V to 5.5V and 2.2V to 5.5V
  • Footprint and function replacement for TCA9517
  • Active-high repeater-enable input
  • Open-drain I2C I/O
  • 5.5V Tolerant I2C and enable input support
  • Lockup-free operation
  • Powered-off high-impedance I2C bus pins
  • Support for clock stretching and multiple controller arbitration across the device
  • Latch-up performance exceeds 100mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 4000V Human-body model
    • 1500V Charged-device model
  • Two-channel bidirectional I2C buffer
  • Support for standard mode, fast mode (400kHz), and fast mode+ (1MHz) I2C operation
  • Operating supply voltage range of 0.8V to 5.5V on A-side
  • Operating supply voltage range of 2.2V to 5.5V on B-side
  • Voltage-level translation from 0.8V to 5.5V and 2.2V to 5.5V
  • Footprint and function replacement for TCA9517
  • Active-high repeater-enable input
  • Open-drain I2C I/O
  • 5.5V Tolerant I2C and enable input support
  • Lockup-free operation
  • Powered-off high-impedance I2C bus pins
  • Support for clock stretching and multiple controller arbitration across the device
  • Latch-up performance exceeds 100mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 4000V Human-body model
    • 1500V Charged-device model

The TCA9617B is a BiCMOS dual bidirectional buffer intended for I2C bus and SMBus systems. The device provides bidirectional voltage-level translation (up-translation and down-translation) between low voltages (down to 0.8V) and higher voltages(2.2V to 5.5V) in mixed-mode applications. This device enables I2C and similar bus systems to be extended, without degradation of performance even during level shifting.

The TCA9617B buffers both the serial data (SDA) and the serial clock (SCL) signals on the I2C bus, allowing two buses of 550pF to be connected in an I2C application. This device can also be used to separate two halves of a bus for voltage and capacitance.

The TCA9617B is a BiCMOS dual bidirectional buffer intended for I2C bus and SMBus systems. The device provides bidirectional voltage-level translation (up-translation and down-translation) between low voltages (down to 0.8V) and higher voltages(2.2V to 5.5V) in mixed-mode applications. This device enables I2C and similar bus systems to be extended, without degradation of performance even during level shifting.

The TCA9617B buffers both the serial data (SDA) and the serial clock (SCL) signals on the I2C bus, allowing two buses of 550pF to be connected in an I2C application. This device can also be used to separate two halves of a bus for voltage and capacitance.
filter Find other I2C & I3C level shifters, buffers & hubs
Download View video with transcript Video

Technical documentation

No results found. Please clear your search and try again.
View all 11
Top documentation Type Title Format options Date
* Data sheet TCA9617B Level-Translating FM+ I2 C Bus Repeater datasheet (Rev. F) PDF | HTML Mar 20, 2026
Application note Preventing ICT-Induced Electrical Overstress on TCA9617B I/O Ports PDF | HTML Jun 5, 2026
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML Jul 3, 2024
Application note Why, When, and How to use I2C Buffers May 23, 2018
Technical article Intro to I2C: what the Internet doesn’t tell you PDF | HTML Nov 24, 2016
Application note Choosing the Correct I2C Device for New Designs PDF | HTML Sep 7, 2016
Selection guide I2C Infographic Flyer Dec 3, 2015
Technical article How to simplify I2C tree when connecting multiple slaves to an I2C master PDF | HTML Oct 15, 2015
Application note Understanding the I2C Bus PDF | HTML Jun 30, 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters May 15, 2015
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML Feb 13, 2015

Design & development

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

Simulation model

TCA9617B IBIS MODEL

SCPM039.ZIP (40 KB) - IBIS model
Supported products & hardware
Design tool

I2C-DESIGNER — I2C designer tool

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 (...)
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
VSSOP (DGK) 8 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos