Patent ID: 9117673
Filing Date: 2015-08-25
Classification: H01L

Abstract:
1. An electrostatic discharge (ESD) protection device, comprising: a substrate of a first conductivity type; a well of a second conductivity type in the substrate, wherein the second conductivity type and the first conductivity type are different; a transistor comprising: a first doped region of the second conductive type, located in the substrate and extending into the well; a second doped region of the first conductive type, located in the substrate and neighboring to the first doped region, wherein a dopant concentration of the second doped region is higher than a dopant concentration of the substrate which is between the first doped region and the second doped region; and a gate over the substrate which is between and directly adjacent to the first doped region and the second doped region in a top view; a third doped region of the second conductivity type in the substrate; a fourth doped region of the first conductivity type in the substrate, wherein the third doped region is located between the second doped region and the fourth doped region; a fifth doped region of the first conductivity type in the well; and a sixth doped region of the second conductivity type in the well, wherein the fifth doped region is located between the first doped region and the sixth doped region, wherein the fifth doped region and the sixth doped region are electrically connected to a bonding pad, and the third doped region and the fourth doped region are electrically connected to a ground terminal; and the gate is electrically connected to the bonding pad through a capacitor C and the ground terminal through a resistor R.