First DO-214AB (SMC) sized Thyristor Capable of Withstanding 3kA Surge

By Sharad Bhowmick

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Littelfuse Pxxx0S3N SIDACtors provide high surge current, and overvoltage protection in a compact package.

SIDACtor DO_214AB Hi_Res

Littelfuse has recently announced the launch of its Pxxx0S3N SIDACtor Protection Thyristor Series. The thyristors are designed to safeguard exposed interfaces in industrial and ICT applications, including RS-485 data interfaces used in factory automation and AC/DC power supplies used in Energy Storage Systems (ESS), and Electric vehicle (EV) wall chargers. The thyristor series is designed to provide 3kA (8/20) high-power surge protection with low thermal accumulation during long-term overvoltage events.

According to the company, Pxxx0S3N SIDACtor Protection Thyristor Series can be incorporated in equipment used in harsh environments, as it provides increased protection from severe overvoltage, has a fast response time in microseconds, and fails short circuit when the surge exceeds the rating, In addition to that, the thyristor does not degrade after multiple surge events within its limits. It also features a 2nd level interconnect which is Pb-free. The switching voltage (VS) of Pxxx0S3N is lower than Gas Discharge Tubes (GDT), and when compared to the Metal Oxide Varistors (MOV) and Transient Voltage Suppressor (TVS) Diodes, it has a lower on-state voltage (VT) making it suitable for a lot of industrial applications.

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“Ongoing product miniaturization requirements result in an increasing demand for compact, high-power-density solutions,” said Ben Huang, Senior Product Marketing Manager / Protection Semiconductor Business at Littelfuse. “Compared to MOVs and TVS diodes, the Pxxx0S3N SIDACtor is significantly smaller, and it is the first product of its size to provide such high surge current protection in such a small package.”

Advantages of Pxxx0S3N:

  • First DO-214AB (SMC) sized product on the market capable of withstanding 3kA (8/20) surges.
  • Provides superior lower clamping when used in conjunction with a series MOV for power line protection.
  • Low leakage extends the lifetime reliability of a series-connected MOV.
  • Unlike GDTs/arrestors, the semiconductor-based SIDACtor does not have a wear-out mechanism over multiple transient events.

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