Electrostatic discharge protection circuit using diodes

摘要

An electrostatic discharge protection circuit, which is arranged between a pad input terminal and a circuit device, includes a first diode protection circuit unit and a second diode protection circuit unit. The first diode protection circuit unit includes a first diode and a second diode, which are connected in parallel between the pad input terminal and an input voltage terminal and face opposite directions. The second diode protection circuit unit includes a third diode and a fourth diode, which are connected in parallel between the pad input terminal and a substrate terminal and face opposite directions. The electrostatic discharge protection circuit can make electrostatic discharge current flow by making all the diodes operate only in a forward direction, irrespective of electrostatic discharge stress generated from the outside.