Clip-attach 600V switching thyristors have current ratings up to 40A

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By Nick Flaherty

The SJ Series High-Temperature SCR (Silicon-Controlled Rectifier) Switching Thyristors are used for rectifier and battery voltage regulators for AC generators in motorcycles, ATVs, small gasoline engines and gasoline/gas electric generators as well as capacitor discharge ignition (CDI) and inrush current limiters for bulk capacitors in AC-DC systems such as LED lighting and battery chargers. They are also used for line AC rectifier bridges for LED lighting systems, soft starters for motor controls and battery chargers.

“The SJ Series SCR Switching Thyristors’ high junction temperature of 150°C ensures a wider operating margin, allowing devices in compact packages to provide performance comparable with those in larger packages,” said Koichiro Yoshimoto, business development manager for the Semiconductor Business Unit at Littelfuse. “That allows designers to achieve higher performance by replacing existing SCRs with new ones with the same package size or they can reduce product size by using SCRs in the more compact packages.” 

The high junction temperature of 150°C provides a wider operating margin in existing designs and allows the use of smaller heat sinks in new designs, and a wide package selection allows designers to select the optimal package for a specific application. A robust clip-attach package design enables high surge capability to allow the SCRs to tolerate high inrush currents and harsher operating conditions for a longer field life.​

The SJ Series SCR Switching Thyristors are available in various package styles, including TO-251AA, TO‑252AA (D-PAK), TO-220 Isolated, TO-220AB Non-Isolated and TO-263 (D2-PAK). Minimum order quantities for products packed in tubes range from 500 to 750. They are also available in embossed carriers, with minimum order quantities of 2,500 (D-PAK) or 500 (D2-PAK).


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