1. Products
  2. Interface and Isolation
  3. Serial Bus Buffers, Extenders, and Accelerators
  4. LTC4318


Features and Benefits

  • 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
  • 20-Lead QFN 4mm × 4mm Package

Product Details

The LTC4318 enables the hardwired address of one or more I2C or SMBus slave devices 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 LTC4318 incorporates a pass-through mode which disables the address translations and allows general call addressing by the master. The LTC4318 is designed to automatically recover from abnormal bus conditions like bus stuck low or premature STOP bits.

Part Number Number of Input Channels Number of Output Channels
LTC4316 1 1
LTC4317 1 2
LTC4318 2 2


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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

Design Tools

Product Recommendations

LTC4318 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC4318CUF#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
LTC4318CUF#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
LTC4318IUF#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
LTC4318IUF#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Wafer Fabrication Data R527 Reliability Data

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Sample & Buy

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Buy Now Pricing

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List Pricing

(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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