LTC4317 - Dual I2C/SMBus Address Translator


  • Allows Multiple Slaves with the Same Address to Coexist on the Same Bus
  • Resistor Configurable Address Translation
  • No Software Programming Required
  • Compatible with SMBus, I2C and I2C Fast Mode
  • Pass-Through Mode Allows General Call Addressing
  • ±4kV HBM ESD Ruggedness
  • Level Translation for 2.5V, 3.3V and 5V Buses
  • Stuck Bus Timeout
  • Prevents SDA and SCL Corruption During Live Board Insertion and Removal
  • Support Bus Hot Swap™
  • 16-Lead DFN 5mm × 3mm Package

Typical Application

LTC4317 Typical Application
LTC4317 Typical Application


The LTC®4317 enables the hardwired address of one or more I2C or SMBus slave device to be translated to a different address. This allows slaves with the same hardwired address to coexist on the same bus. Only discrete resistors are needed to select the new address and no software programming is required. Up to 127 different address translations are available.

The LTC4317 incorporates a pass-through mode which disables the address translation and allows general call addressing by the master. The LTC4317 is designed to automatically recover from abnormal bus conditions like bus stuck low or premature STOP bits.

LTC4316 1 1
LTC4317 1 2
LTC4318 2 2


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
LTC4317CDHC#PBF 5x3 DFN-16 DHC C 05-08-1706 Yes
LTC4317CDHC#TRPBF 5x3 DFN-16 DHC C 05-08-1706 Yes
LTC4317IDHC#PBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC4317IDHC#TRPBF 5x3 DFN-16 DHC I 05-08-1706 Yes

LTC4317 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
LTC4317CDHC#PBF 5x3 DFN-16 C $2.50 $1.75 Yes
LTC4317CDHC#TRPBF 5x3 DFN-16 C $2.56 $1.81 Yes
LTC4317IDHC#PBF 5x3 DFN-16 I $2.88 $2.01 Yes
LTC4317IDHC#TRPBF 5x3 DFN-16 I $2.94 $2.07 Yes
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* 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.

Click here to view our complete list of demo boards


  • I2C, SMBus Address Expansion
  • Address Translation
  • Servers
  • Telecom

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