Littelfuse claims SCR thyristors are industry’s first at 150 degree C in D-PAK

Suitable for switch applications like phase control in heating, motor speed controls, converters/rectifiers and capacitive discharge ignition (CDI), the SJ Series silicon-controlled rectifier (SCR) thyristors are the first to offer a junction temperature of 150 degree C in a compact surface-mount D-PAK (TO-252) packaging, says Littelfuse.

The devices are also available in through-hole V-PAK (TO-251) packages. Standard SJ series SCR thyristors have a low gate current trigger level of six or 15mA maximum at approximately 1.5V. Sensitive models in the series feature a gate trigger current of less than 200-microA. These sensitive gate devices can be triggered by sense coils, proximity switches, and microprocessors.

Applications for the SJ series SCR thyristors include CDI systems for motorcycle engines, portable generator engine ignition, strobe lights and nailers, as well as generic rectifiers, battery voltage regulators, converters and inrush current limiting circuits in AC/DC converters. They are also suitable for use in controls for power tools, home/brown goods (such as consumer electronics like televisions, radios, digital media players, and computers) and white goods and appliances.

Despite the SJ Series’ compact D-PAK and V-PAK footprints, its high junction temperature allows for performance comparable to that of SCR thyristors in larger TO-220AB and TO-263 packages, says the company, due to its wider operating margin. The combination of a higher junction temperature and surge handling capability will allow designers to replace existing SCR thyristors in the larger packages, and allow others to design smaller products.

The robust clip-attach package design enables high surge capability, so the thyristors can tolerate harsher operating conditions.

The SJ Series (SJxx04x, SJxx06x, SJxx08x, SJxx10x and SJxx12xx) SCR Thyristors are available in a choice of D-PAK and V-PAK packages in tubes in minimum order quantities of 750 (75 per tube) or in embossed carriers with a minimum order quantity of 2,500. Sample requests may be placed through authorised Littelfuse distributors worldwide.


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