Discrete thyristor withstands voltage spikes above 1,200V

25th February 2016
Jordan Mulcare

Littelfuse has introduced the company’s first discrete thyristor devices capable of withstanding voltage spikes higher than 1,200V. The Littelfuse Teccor SK225xD/SK255KD/SK625xD/SK655KD series SCR switching thyristors are unidirectional switches designed to handle voltage spikes and power surges in incoming AC power mains.

They can take up to 1,300V (SK225xD and SK255KD series) or 1,700V (SK625xD and SK655KD series) without malfunctioning and are suitable for switching 50/60Hz AC mains up to 440V rms. High repetitive and non-repetitive, peak, off-stage voltage (VDRM/VDSM) ratings ensure reliable operation even when subjected to the high voltage surges common in commercial AC mains power in some areas, says the company.

Typical applications include AC solid-state switches, industrial power tools, and line rectification. According to the company, they are particularly useful in regions where the AC mains voltage is unstable; even 240Vrms or lower lines may have voltage spikes of 1,000V or higher, so a 1,200V or 1,600V SCR may be required.

The durable internal ceramic insulation (RD, LD and KD packages) provides high electrical isolation voltage for operating safety.

The SK225xD and SK625xD models are available in TO-220AB packages, while the SK255KD and SK655KD are available in TO-218AC packages.


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