SCR thyristor handles 600V, 40A at 150°C

July 11, 2017 // By Nick Flaherty
Littelfuse has developed a series of 40A standard high-temperature silicon-controlled rectifier (SCR) thyristors as switches for rectifier and phase control applications such as voltage regulator, heating and motor speed controls.

The SJxx40x Series is the first SCR thyristor from Littelfuse capable of handling 600V, 40Arms and junction temperatures up to 150°C. The devices are designed to prevent the overheating and thermal runaway problems SCRs can experience due to an application’s limited cooling capability or occasional overload situation, triggering with just a few milli-amps of current at less than 1.5V.

Typical applications are rectifiers in a variety of end uses including AC solid-state switches, industrial power tools, exercise equipment, white goods and commercial appliances.

“Designers who once had to deal with limited cooling capabilities can now take advantage of an SCR Thyristor with the ability to operate at higher temperatures, which minimizes the risk of an uncontrolled temperature increase in challenging applications,” said Koichiro Yoshimoto, business development manager at Littelfuse. “Switching to the new SJxx40x Series will make it possible to handle more current or use a smaller heat sink to handle the same power.”

The devices handle high load current and occasional overloads under limited cooling conditions due to high junction temperature (TJ) of 150°C and have a high on-state current (IT) of 40Arms for higher load currents. A high rate of voltage change over time (dv/dt) enables the SJxx40X to tolerate more line noise and surge often found in commercial AC lines.

The SJxx40x Series is available in either TO-220AB (non-isolated) or TO-263 (D2-Pak) packaging in quantities of 500, with 50 per tube.