Big power semiconductor rectifying tube of ultra -thin type

The utility model provides a big power semiconductor rectifying tube of ultra -thin type. Belongs to the technical field of power semiconductor devices. It solves current rectifying tube to influence the problem of stability and reliability because on -state pressure drop and temperature rise are higher. Its leading features is: including ceramic cartridge or plastic envelope casing, semiconductor chip, positive pole molybdenum sheet, cathode surface metallic coating and chip mesa protection glue film, semiconductor chip is the semiconductor chip of the P+PNN+ four -layer structure that comprises positive pole high concentration doped region P+, positive pole doped region P, negative pole doped region N, negative pole high concentration doped region N+, positive pole high concentration doped region P+ surface is the rough layer through chemical treatment, ceramic cartridge or plastic envelope casing are ceramic cartridge or the plastic envelope casing unanimous with semiconductor chip thickness. The utility model has the characteristics of high -frequency, long -life, reliability are high, the uniformity is good and with low costs, fields such as mainly used heavy current electric welding, pulse field, power, locomotive, environmental protection.