Product details


Features Buffer, Enable Pin, Hot swap, Stuck bus recovery Frequency (Max) (kHz) 400 VCCA (Min) (V) 2.3 VCCA (Max) (V) 5.5 VCCB (Min) (V) 2.3 VCCB (Max) (V) 5.5 Supply restrictions VCC Single Supply 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


  • Supports bidirectional data transfer of I2C bus signals
  • Operating power-supply voltage range of 2.3 V to 5.5 V
  • TA ambient air temperature range of -40 °C to 125 °C
  • Stuck bus recovery featuring automatic bus recovery
  • 1-V Precharge on all SDA and SCL lines prevents corruption during live insertion
  • Accommodates standard mode and fast mode I2C devices
  • Supports clock stretching, arbitration and synchronization
  • Powered-off high-impedance I2C pins
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The TCA4307 is a hot-swappable I2C bus buffer that supports I/O card insertion into a live backplane without corruption of the data and clock lines. Control circuitry prevents the backplane-side I2C lines (in) from being connected to the card-side I2C lines (out) until a stop command or bus idle condition occurs on the backplane without bus contention on the card. When the connection is made, this device provides bidirectional buffering, keeping the backplane and card capacitances isolated. During insertion, the SDA and SCL lines are pre-charged to 1 V to minimize the current required to charge the parasitic capacitance of the device.

The TCA4307 has stuck bus recovery, which automatically disconnects the bus if it detects either SDAOUT or SCLOUT are low for about 40 ms. Once the bus is disconnected, the device automatically generates up to 16 pulses on SCLOUT to attempt to reset the device which is holding the bus low.

When the I2C bus is idle, the TCA4307 can be put into shutdown mode by setting the EN pin low, reducing power consumption. When EN is pulled high, the TCA4307 resumes normal operation. It also includes an open drain READY output pin, which indicates that the backplane and card sides are connected together. When READY is high, the SDAIN and SCLIN are connected to SDAOUT and SCLOUT. When the two sides are disconnected, READY is low.

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Technical documentation

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Type Title Date
* Data sheet TCA4307 Hot Swappable I2C Bus and SMBus Buffer with Stuck Bus Recovery datasheet Dec. 15, 2017
Application note I2C Solutions for Hot Swap Applications Jan. 31, 2020

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

Speed up your op amp prototyping and testing with the DIP-Adapter-EVM, which provides a fast, easy and inexpensive way to interface with small, surface-mount ICs. You can connect any supported op amp using the included Samtec terminal strips or wire them directly to existing circuits.

The (...)

  • Simplifies prototyping of SMT IC’s
  • Supports 6 common package types
  • Low Cost
document-generic User guide
This EVM provides configurable loading conditions through adjustable pull up resistors and bus capacitance which allows designers to easily test the performance of this device in their system. The EVM can be populated with a socket to test over temperature as well.
  • Hot swappable
  • Low dynamic offset voltage
  • Rise time accelerator
  • Adjustable pull up resistors and capacitave loading switches

Design tools & simulation

SCPM046.ZIP (44 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

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Support & training

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