Littelfuse launches SM10 series varistor

30th January 2024
Paige West

Littelfuse, Inc. has announced the introduction of the SM10 Varistor Series. This Metal Oxide Varistor (MOV) is designed for superior transient surge protection in various fields including automotive electronics, electric vehicles (EVs), and more.

Notably, it's the first surface-mounted MOV device to comply with the AEC-Q200 automotive standard, offering high-temperature endurance and ultra-high surge current handling in a compact form. A video showcasing the product is available for viewing.

Key features of the SM10 Series Varistor include:

  • High operating temperature: withstands temperatures up to 125°C, ensuring reliability under harsh conditions
  • AEC-Q200 compliance: meets stringent automotive electronics standards, making it suitable for EVs and charging stations
  • Ultra-high surge capability: handles up to 40 pulses of 6KV/3KA surges, enhancing product reliability and lifespan
  • Compact design: measuring 15.7 x 8.5 x 14mm, it saves PCB space and suits automated SMT PCB assembly
  • Wide voltage rating: ranges from 130 to 625Vac, catering to a wide array of electronic applications

Johnny Chang, Director of product management at Littelfuse, stated: "The SM10 Series Varistors effectively protect electronic circuits against multiple transient voltage surges with ultra-high surge handling capability. They are AEC-Q200 compliant, enabling end-products to work in harsh ambient environments for longer lifetimes."

Amy Chu, Global Product Manager at Littelfuse, also remarked: "The vertical surface-mounted SM10 Series Varistors enable electronics designers to realise a 'SMT components only policy' for primary side circuit surge protection. Their compact size and ability to replace through-hole devices allow for fully automated and SMT PCB assembly processes."

The SM10 is well-suited for a range of challenging applications, including automotive electronics, building automation, appliances, consumer electronics, power storage systems, and high-end power supplies. Its high operating temperature, superior repetitive surge capability, and compact size make it a highly attractive option for industries in need of reliable high-surge varistors.


The SM10 Varistor Series is offered in tape and reel quantities of 300. Sample requests can be made through authorised Littelfuse distributors globally.

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