Patent ID: 8896108
Filing Date: 2014-11-25
Classification: H01L

Abstract:
1. A semiconductor die comprising: a semiconductor substrate of a first conductive type; a first semiconductor layer of a second conductive type disposed on a front surface of the semiconductor substrate; a second semiconductor layer of the first conductive type disposed on the first semiconductor layer; a first electrode and a second electrode that are in contact with the second semiconductor layer so that a current runs between the two electrodes through the second semiconductor layer under a normal input current condition; a metal film disposed on a back surface of the semiconductor substrate so as to be in a direct physical contact with the back surface, wherein the semiconductor die is bonded to an island of a lead frame by a conductive paste so that the metal film is attached to the island through the conductive paste, and the semiconductor substrate and the first and second semiconductor layers are configured to operate as a parasitic bipolar transistor so as to release a first portion of an input current along a second path to the island in response to a surge event, wherein the semiconductor substrate, the first semiconductor layer, the second semiconductor laver, the first electrode, and the metal film cooperate to form the second path; an isolation layer in contact with the semiconductor substrate; and a third electrode, the third electrode in contact with the isolation layer, wherein the substrate, the isolation layer, and the third electrode serve as a first path along which a second portion of the input current is released in response to the surge event.