SMD Series - PolySwitch 2920, 3425, & 2018 Size Lead-Free Surface Mount Resettable PPTC

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Disclaimer Notice

Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, 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 SMD series provides surface mount overcurrent protection for applications where space is at a premium and resettable protection is desired.


  • Broadest range of resettable devices available in industry
  • Low resistance

Compact Design and New HV Ratings

  • Smaller size helps reduce board space and cost
  • Many product choices optimizes design flexibility
  • Compatible with high-volume electronics assembly
  • Higher voltage ratings allow use in new applications

Mobile Electronics and Batteries

  • Computer
  • Portable electronics
  • Multimedia
  • Game machines
  • Telephone and broadband
  • Automotive
  • Industrial controls
  • Battery

Access specifications, certifications, check availability and order parts below

Catalog #IHold (A)ITRIP
Max Volts
Trip Time
SMD030F-20.30.660101.71.24.832920Product SpecificationCheckOrder
SMD030F-2018-20.30.860201. SpecificationCheck
SMD050F-20.5160101.70.351.442920Product SpecificationCheckOrder
SMD075F-20.751.530401.70.3510.32920Product SpecificationCheckOrder
SMD075F/60-20.751.560101.70.3510.32920Product SpecificationCheck
SMD100F-21.12.230401.70.120.480.52920Product SpecificationCheckOrder
SMD100F-2018-21.12.215401. SpecificationCheck
SMD100F/33-21.12.233401.70.120.410.52920Product SpecificationCheck
SMD125F-21.252.515401.70.070.2522920Product SpecificationCheck
SMD150F-21.5315401.90.060.2553425Product SpecificationCheck
SMD150F-2018-21.5315401.80.070.1812018Product SpecificationCheck
SMD150F/33-21.5333401.90.080.2353425Product SpecificationCheckOrder
SMD150F/33-2920-21.5333401.50.080.2352920Product SpecificationCheck
SMD185F-21.853.633401.50.0650.16553425Product SpecificationCheckOrder
SMD200F-22415401.90.050.125123425Product SpecificationCheck
SMD200F-2018-224.26401.50.0480.132018Product SpecificationCheckOrder
SMD200F/24-2920-22424401.50.050.12552920Product SpecificationCheckOrder
SMD250F/15-2920-22.5515401.50.0350.085102920Product SpecificationCheck
SMD250F-22.5515401.90.0350.085253425Product SpecificationCheckOrder
SMD260F-22.65.26401.70.0250.075202920Product SpecificationCheck
SMD300F/15-23615401.50.0150.05352920Product SpecificationCheck
SMD300F-2366401.50.0150.048352920Product SpecificationCheck
SMDH120-21.22.3165020.150.3422920Product SpecificationCheck
SMDH160-21.63.216702.20.050.15153425Product SpecificationCheck