Littelfuse has launched the industry’s first 2kA surge-rated protection thyristor in a DO-214AB package with its Pxxx0S3H SIDACtor series, directly addressing miniaturization challenges in EV charging infrastructure. As charging power levels exceed 50kW and installation density increases, traditional TO-262 packages and degradation-prone MOVs are becoming design bottlenecks.

The component delivers 2kA (8/20µs) surge capability in just 6.22mm × 7.11mm × 2.62mm dimensions—approximately 60% smaller than equivalent TO-262 solutions. Unlike MOV-based protection, the semiconductor thyristor doesn’t degrade after repeated high-energy events. This eliminates typical MOV degradation and replacement cycles while enhancing system reliability in 24/7 charging operations. It also meets IEC 61000-4-5 Level 4 compliance requirements.

“We’re seeing 50kW+ DC fast chargers packed into ever-smaller enclosures,” explains Ben Huang, Director of Product Marketing at Littelfuse. “Engineers need surge protection that doesn’t compromise on footprint or long-term reliability.”

Primary EV applications targeted are AC and DC protection in residential (7-22kW) and commercial (50kW+) wall chargers, onboard charging systems for 800V architectures, and battery management systems protecting high-value battery packs from grid disturbances. The device functions standalone or in hybrid architectures with MOVs for staged protection schemes.

The semiconductor-based approach eliminates MOV replacement maintenance cycles while supporting higher power density designs. For charging infrastructure OEMs and Tier 1 suppliers, this enables future-proof protection architectures meeting aggressive miniaturization targets. The Pxxx0S3H series is available now through Littelfuse’s global distributor network.

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