0603L300SL - Low Rho SMD Series

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

Littelfuse Low Rho Surface Mount PPTC (Polymer Positive Temperature Coefficient) devices provide overcurrent protection for applications where ultra low internal resistance, ultra low voltage drop and automatic resettable protection are desired. This new series allows a higher hold current device in a smaller factor and lower profile as compared to a standard PPTC. It offers ultra low internal resistance while maintaining the high level electrical characteristics and performances of standard PPTC products. All devices are UL recognized and TUV approved and have maximum fault current of 50A. They are available in 0402 to 2920 sizes while the hold current ranges from 100mA to 9A.

Littelfuse 0402 size Low Rho SMD PPTC is the smallest size surface mounted PPTC device available in the market.


  • Ultra low internal resistance
  • Very thin profile
  • Miniature size saves board space
  • Allows a higher hold current dvice in a smaller factor and lower profile as compared to a standard PPTC
  • Fast response to fault currents
    0402 size available - the smallest PPTC in the market
  • Compatible with high temperature solders 
  • Broadest range of Hold Current ratings (100mA to 9A)
  • RoHS compliant, Lead Free and Halogen Free 
  • UL recognized and TUV approved
  • 0603L150SL ideal for USB 3.0



  • USB peripherals including new USB 3.0 / 2.0 ports
  • Li-ion / Li-Polymer battery pack
  • Smart phones
  • Tablet and Notebook PCs
  • E-readers
  • Computer periperals
  • Digital cameras and video cameras
  • Hard disk drives
  • Game consoles

0603L300SL ECAD Models

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Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
0603L300SLYR PTC 6V POLYFUSE SURF MOUNT 0603 SL 3.00A RoHS No 09/01/2021 PbFree No 09/01/2021 CoC_RoHS10_0603L300SLYR_09-01-2021 REACH219_Declaration_0603L300SLYR_09-01-2021 Yes
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