Patent ID: 9018070
Filing Date: 2015-04-28
Classification: H01L

Abstract:
1. A manufacturing method of a diode device for a transient voltage suppressor (TVS) circuit, wherein the TVS circuit includes a suppressor device having a PN junction, and the diode device has a PN junction which is coupled to the PN junction of the suppressor device in a reverse direction, the manufacturing method comprising: providing a P-type substrate, which has an upper surface; forming an N-type well in the substrate beneath the upper surface, and forming an N-type buried layer in the substrate below the well, wherein the buried layer has an impurity concentration higher than that of the well; forming a separation region in the substrate beneath the upper surface, wherein the separation region is located in the well from top view; forming a P-type anode region beneath the upper surface at one side of the separation region; and forming an N-type cathode region beneath the upper surface at the other side of the separation region, wherein the cathode region is separated from the anode region by the separation region.