TVS Diodes (ESD Protection Devices)Section 1 “What is ESD (Electrostatic Discharge)?”

What is ESD (Electrostatic Discharge)?

When two electrically charged objects, such as the human body and an electronic device come into contact with each other, static electricity is discharged. This phenomenon is called ESD (Electrostatic Discharge). ESD generated from the human body can be of the order of several thousand volts. This high voltage pulse enters the electronic device that is touched, resulting in a malfunction or destruction of the IC circuits inside it. In order to prevent the destruction of a product or system due to the intrusion of ESD into an electronic device that was touched, it is necessary to install countermeasure components that suppress or remove ESD.


Points where ESD countermeasures are necessary

ESD countermeasures are necessary at all points where electrical devices are likely to come into contact with a person or an object. Examples include USB2.0, USB3.0, output terminals, LAN or other points where a user connects or disconnects a connector, cases in which an operation button of an electrical product is touched, or a device touches a board during a production process, and also cases in which boards are connected to each other using a connector. Parts that are installed at these points as ESD countermeasures are called “TVS Diodes*.”

ESD Connecting or disconnecting the connector of a PC, etc. Pressing a button  Connecting boards to each other

* This is a generic term for an ESD protective suppressor, an ESD protective diode, an ESD protective filter, an ESD protective device, ESD protection, and a ESD Protection Device. On these pages, all of these devices are referred to as TVS Diodes.