LTC4310 - Hot-Swappable I2C Isolators

Features

  • Bidirectional I2C Communication Between Two Isolated Buses
  • Full Isolation with Inexpensive Ethernet Transformers or Capacitors
  • Low Voltage Level Shifting
  • I2C Maximum Operating Frequency:
    100kHz for LTC4310-1
    400kHz for LTC4310-2
  • I2C Specification Compliant VOL, VIL
  • ±5kV Human Body Model ESD Protection
  • Rise Time Accelerators
  • SDA, SCL Hot-Swapping
  • Very Low Shutdown Current
  • Stuck Bus Disconnect and Recovery
  • Thermal Shutdown
  • 10-Lead MSOP and 3mm × 3mm DFN Packages
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC4310 Typical Application
LTC4310 Typical Application

Description

The LTC4310 provides bidirectional I2C communications between two I2C buses whose grounds are isolated from one another. Each LTC4310 encodes I2C bus logic states into signals that are transmitted across an isolation barrier to another LTC4310. The receiving LTC4310 decodes the transmission and drives its l2C bus to the appropriate logic state. The isolation barrier can be bridged by an inexpensive Ethernet, or other transformer, to achieve communications across voltage differences reaching thousands of volts, or it can be bridged by capacitors for lower voltage isolation. The LTC4310-1 is intended for use in 100kHz I2C systems. The LTC4310-2 is intended for 400kHz I2C systems.

Rise time accelerators provide strong pull-up currents on SCL and SDA rising edges to meet rise time specifications for heavily loaded systems. Data and clock Hot Swap™ circuitry prevent data corruption when a card is inserted into or removed from a live bus. When a bus is stuck low for 37ms, the LTC4310 turns off its pull-down devices and generates up to sixteen clocks and a STOP bit in an attempt to free the bus. Driving EN low sets the LTC4310 in a very low current shutdown mode to conserve power.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC4310CDD-1#PBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4310CDD-1#TRPBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4310CDD-2#PBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4310CDD-2#TRPBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4310CMS-1#PBF MS-10 MS C 05-08-1661 Yes
LTC4310CMS-1#TRPBF MS-10 MS C 05-08-1661 Yes
LTC4310CMS-2#PBF MS-10 MS C 05-08-1661 Yes
LTC4310CMS-2#TRPBF MS-10 MS C 05-08-1661 Yes
LTC4310IDD-1#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4310IDD-1#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4310IDD-2#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4310IDD-2#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4310IMS-1#PBF MS-10 MS I 05-08-1661 Yes
LTC4310IMS-1#TRPBF MS-10 MS I 05-08-1661 Yes
LTC4310IMS-2#PBF MS-10 MS I 05-08-1661 Yes
LTC4310IMS-2#TRPBF MS-10 MS I 05-08-1661 Yes


LTC4310 Package Drawing
LTC4310 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC4310CDD-1#PBF 3x3 DFN-10 C $2.11 $1.48 Yes
LTC4310CDD-1#TRPBF 3x3 DFN-10 C $1.54 Yes
LTC4310CDD-2#PBF 3x3 DFN-10 C $2.11 $1.48 Yes
LTC4310CDD-2#TRPBF 3x3 DFN-10 C $1.54 Yes
LTC4310CMS-1#PBF MS-10 C $2.11 $1.48 Yes
LTC4310CMS-1#TRPBF MS-10 C $1.54 Yes
LTC4310CMS-2#PBF MS-10 C $2.11 $1.48 Yes
LTC4310CMS-2#TRPBF MS-10 C $1.54 Yes
LTC4310IDD-1#PBF 3x3 DFN-10 I $2.54 $1.78 Yes
LTC4310IDD-1#TRPBF 3x3 DFN-10 I $1.84 Yes
LTC4310IDD-2#PBF 3x3 DFN-10 I $2.54 $1.78 Yes
LTC4310IDD-2#TRPBF 3x3 DFN-10 I $1.84 Yes
LTC4310IMS-1#PBF MS-10 I $2.54 $1.78 Yes
LTC4310IMS-1#TRPBF MS-10 I $1.84 Yes
LTC4310IMS-2#PBF MS-10 I $2.54 $1.78 Yes
LTC4310IMS-2#TRPBF MS-10 I $1.84 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1079A-A LTC4310-1 (100kHz) I2C Isolator $50.00
DC1079A-B LTC4310-2 (400kHz) I2C Isolator $50.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC4310IMS-1#PBF MS-10 I $2.54 $1.78 Yes
LTC4310IMS-1#TRPBF MS-10 I $1.84 Yes
LTC4310IMS-2#PBF MS-10 I $2.54 $1.78 Yes
LTC4310IMS-2#TRPBF MS-10 I $1.84 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

  • Isolated I2C, SMBus and PMBus Interfaces
  • Isolated Power Supplies
  • Positive-to-Negative Rail Communications
  • Power-over-Ethernet

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support