ESD protection device

An electrostatic discharge (ESD), protection device, comprising:

• a node terminal configured to be connected to a node of a circuit to be protected;
• a reference terminal configured to be connected to a reference voltage, wherein the reference voltage is ground;
• and
• a series connection of a first unit and a second unit arranged in between the node terminal and the reference terminal;
• wherein the ESD protection device is configured to provide a conductive path between the node terminal and the reference terminal and through the series connection in case of an ESD event occurring on the node to be protected;
• wherein for a first current flow from one of the node terminals and the reference terminal to the other of the node terminal and the reference terminal:
• the first unit has I-V characteristics that display a first snapback that is described by a first trigger voltage and a first holding voltage;
• the second unit comprises a junction that is reverse biased for the first current flow, the reverse biased junction having I-V characteristics that are described by a second trigger voltage, and if these I-V characteristics display a second snapback, also by a second holding voltage;
• wherein the first unit has a first series capacitance and the second unit a second series capacitance, wherein the second series capacitance is at least 3 times greater than the first series capacitance;
• and
• wherein the second trigger voltage, or the second holding voltage if the I-V characteristics of the second unit display the second snapback, has a magnitude that is at least 3 times greater than a magnitude of the first holding voltage.