femtoASMD Series - PolySwitch Automotive 0603 Size Lead-Free Surface Mount Resettable PPTC

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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.

The femtoASMD is the first small-sized 0603 PPTC series from Littelfuse with AEC-Q200 qualification for Automotive Applications and it provides surface mount overcurrent protection for applications where space is a prime concern and resettable protection is desired.


  • Products meet applicable automotive industry standards
  • Compatible with high-volume electronics assembly
  • Smaller footprint ˗ 0603 Size
  • Resettable solution against overcurrent and short-circuit
  • AEC-Q200 qualified, RoHS compliant, and ISO/TS16949 certified
  • Surface-mount Form Factor


  • Expertise from the world’s leading resettable overcurrent protection manufacturer
  • Provides wider range of form factors to enhance design flexibility
  • Meets ever-increasing demand for compact and space-saving designs due to more electronics content in vehicle
  • Restores system operation after reset when fault condition is removed, thus provides safety and protection
  • Able to meet most stringent requirements for the extreme harsh automotive environment
  • Suitable for standard PCB assembly to enable automated mass production


  • Automotive and Industrial Transportation
  • Actuators and medium motors
  • Trace protection
  • Harness/junction box protection
  • Powered outputs
  • Electronic control modules
  • Telematics/Infotainment

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Access specifications, certifications, check availability and order parts below

Catalog #IHold (A)ITRIP
Max Volts
RaMAX (Ω)Max
Trip Time
Max Operating Temp (°C)Product
Partner ECAD ModelsStockSamplesCompare
FEMTOASMDC005F-20.050.1515100.53.830300.185Product SpecificationFEMTOASMDC005F-2CheckOrder
FEMTOASMDC008F-20.080.212100.52.814140.185Product SpecificationFEMTOASMDC008F-2CheckOrder
FEMTOASMDC010F/15-20.10.315100.5214140.185Product SpecificationFEMTOASMDC010F/15-2CheckOrder
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
RF4558-000 FEMTOASMDC005F-2 RoHS No 08/28/2018 PbFree No 08/28/2018 CoC_RoHS10_RF4558-000_FEMTOASMDC005F-2 REACH219_Declaration_RF4558-000_(FEMTOASMDC005F-2) Yes
Does not Contain
RF4559-000 FEMTOASMDC008F-2 RoHS No 07/26/2017 PbFree No 07/26/2017 CoC_RoHS10_RF4559-000_FEMTOASMDC008F-2 REACH201_Declaration_RF4559-000_FEMTOASMDC008F-2 Yes
Does not Contain
RF4560-000 FEMTOASMDC010F/15-2 RoHS No 04/26/2016 PbFree No 04/26/2016 CoC_RoHS10_RF4560-000_femtoASMDC010F15 REACH_SVHC Declaration_RF4560-000 (FEMTOASMDC010F-15-2) Yes
Does not Contain
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