Patent ID: 8536680
Filing Date: 2013-09-17
Classification: H01L

Abstract:
1. An electrostatic discharge protection circuit comprising a bipolar transistor which comprises: a first diffusion layer of a first conductive type connected with a first power supply and functioning as a base; a second diffusion layer of a second conductive type connected with a second power supply and functioning as a collector; and a third diffusion layer of the second conductive type connected with an input/output pad and functioning as an emitter, wherein an area of a first region of said third diffusion layer which horizontally aligns with said first diffusion layer, meaning an area of the first region of the diffusion layer having a top portion directly facing the first diffusion layer, is larger than an area of a second region of said second diffusion layer which horizontally aligns with said first diffusion layer, meaning an area of the second region of the second diffusion layer having a top portion directly facing the first diffusion layer.