SM20 Series - Surface Mount Varistor for use in applications requiring hi-energy / transient current capability

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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 Littelfuse SM20 Series is a 20mm SMD metal oxide varistor device. The AC rated parts are designed to operate continuously across AC power lines. The DC rated parts are suitable for Automotive applications. The series comprises a Nylon molded package with folded tin plated metal leads for soldering to board.

The SMD Series is based on radial 20mm internal varistor element with similar characteristics to the Littelfuse LA / ZA series of varistors.


  • DC Voltage Rating 26 – 420VDC
  • AC Voltage Rating 175 - 320AC
  • No De-Rating up to 85°C ambient
  • Lead-free, Halogen-free and RoHS compliant
  • Low voltage devices specified for automotive load dump energy
  • Available in "waffle" tray packaging

Access specifications, certifications, check availability and order parts below

Catalog #Polarity(ITM 1xAmps (A)MSLCo Typ
V175SM20Bi-directional6500level 1140020mm455175225303247CheckOrder
V230SM20Bi-directional6500level 1110020mm595230300396324CheckOrder
V250SM20Bi-directional6500level 1100020mm650250330429354CheckOrder
V26SM20Bi-directional2000level 11200020mm6320264032CheckOrder
V275SM20Bi-directional6500level 190020mm710275369473389CheckOrder
V300SM20Bi-directional6500level 180020mm775300405517420CheckOrder
V320SM20Bi-directional6500level 175020mm810320420540462CheckOrder

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