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Littelfuse AUMOV® Series Varistors

The Littelfuse AUMOV® Varistor Series is designed for automotive applications requiring load dump, jump start and surge voltage transient protection.

The AUMOV® Series Varistor offers 50% greater surge withstanding capability than existing technologies on the market for low DC voltage applications. The maximum peak surge current is rated up to 5KA (8/20μs pulse) to protect sensitive automotive systems from voltage transients induced by load dump and other transient events.

Littelfuse AUMOV® Varistors provide an ideal circuit protection solution for lower DC voltage automotive applications, whether they’re located in the vehicle’s passenger compartment or under the hood. They are particularly suitable for use in harsh under-hood environments with operating temperatures up to 125°C.

Disc Sizes

This AEC-Q200 compliant series is available in five disc sizes: 5mm, 7mm, 10mm, 14mm and 20mm. It features a wide operating voltage range from 14VAC to 42VAC and 16VDC to 50VDC.


  • Meets the stringent quality standards of AEC-Q200
  • UL recognized
  • Optional phenolic coating for operating temps up to 125°C
  • High peak surge current rating and energy absorption capability
  • Reduced footprint and volume required for voltage surge protection
  • High resistance to thermal cycles for phenolic coating
  • Lead free, halogen free and RoHS compliant


  • Meets automotive industry requirements
  • Suitable for harsh automotive environments
  • Helps meet UL1449 requirements
  • Well suited for the passenger compartment and the stringent temperature requirements of under-the-hood electronics
  • Provides robust protection against overvoltages induced by load dump, jump start, and other transients


  • Body electronics systems
  • Powertrain systems
  • Infotainment systems
  • Automotive control module protection
  • Motor or inductive load transient suppression
Automotive Electronics