The SK2xxxD / SK6xxxD series SCR switching thyristors from Littelfuse are unidirectional switches designed to handle voltage spikes and power surges in incoming AC power mains. These SCRs can take up to 1300 V (SK2xxxD series) or 1700 V (SK6xxxD series) without malfunctioning. They are suitable for switching of 50 / 60 Hz AC mains up to 440 V_RMS. These high-voltage SCRs have high repetitive and non-repetitive peak off-stage voltage (V_DRM / V_DSM) ratings, ensuring reliable operation even when subjected to the high voltage surges common in commercial AC mains power in some areas. Typical applications include AC solid-state switches, industrial power tools, and line rectification (50 / 60 Hz).

Features and Benefits

• High repetitive peak off-state voltage (V_DRM) of 1200 V or 1600 V
• High non-repetitive peak off-state voltage (V_DSM) of 1300 V or 1700 V
• Durable internal ceramic insulation (RD, LD, and KD packages)
• Ensures reliable operation for AC mains voltages of 440 V_RMS (SK2xxxD series) or 600 V_RMS (SK6xxxD series)
• Withstands voltage surges common in commercial AC mains power
• Provides high electrical isolation voltage to ensure operating safety