3.6kV phase control thyristors offer increased current rating

The silicon die is alloyed to a metal disc and encapsulated in a fully hermetic ceramic package. Overall, the mechanical design presents reduced thermal resistance and the die has enhanced electrical performance. Typical applications include soft starters, DC drives and all controlled rectifier applications requiring devices in this power rating.

The 56mm die device has an average current rating of 1725A and the package has a 50mm electrode contact diameter, with an industry standard overall diameter of 74mm. This device will ultimately replace two older designs based on 53mm dice. Part designations are N1314NC360 and N1478NC300, offering a respective increase in average current of 31% and 17%. The thyristors remain mechanically compatible with the old designs and can be used in the same mechanical systems.

This device is also an alternative to the current 50mm die design offering the potential of 52% more current rating in the same mechanical footprint, as long as the cooling and clamping systems are appropriately scaled to accommodate the larger die area.

“This device falls within the mid-range current rating of IXYS UK’s product portfolio and offers the highest ever power density in this package size and voltage class. The larger die size offers the best performance and value for the money, and continues the IXYS strategy to supply products with more power and less package. Higher currents in smaller packages allow our customers to optimise their designs to use less material and to save cost as well as to reduce the impact on the environment,” commented Frank Wakeman, Marketing and Technical Support Manager, IXYS UK.

The device is available in a 26mm thick package, with two voltage grades. Designations are: N1725MC320 (Vdrm/Vrrm 3200V) and N1725MC360 (Vdrm/Vrrm 3600V). A version of this device optimised for series operation in medium voltage applications will also be available.