How to choose the appropriate device for NFC interface protection?

Application occasions
In the era of the Internet of Things, especially with the rampant Omicron everywhere, many of our products use Near Field Communication (NFC) lines or other wireless methods for communication. All wireless products come with antennas. How to achieve interface protection on small volume products has troubled many engineers..

Selection basis

Firstly, in order to meet the requirements of lightweight and portable electronic products, the size of ESD protection components must be small enough, such as the 0402 package size or even the 0201 package size, to achieve the advantages of high integration and high flexibility in PCB design..
Secondly, the parasitic capacitance of the ESD protection component pin itself must be small to avoid signal interference. For example, when using ESD protection components in antennas, it is necessary to consider the frequency band used by the antenna and the minimum parasitic capacitance value that can be accepted in different frequency bands. Typically, the parasitic capacitance value of ESD protection components used in antennas must be less than 1pF or even lower..
Thirdly, the selection of the maximum operating voltage and unidirectional or bidirectional characteristics applicable to the ESD protection component must consider the highest and lowest voltage of the signal oscillation to avoid signal interference. For example, when using antennas in NFC, the highest signal voltage usually reaches 18V or negative pressure, and a bidirectional ESD protection component suitable for this signal voltage must be selected; When using GPS antennas, the highest voltage is usually less than 5V and the lowest voltage is not less than 0V. A 5V unidirectional ESD protection component can be used..
Fourthly, the ESD protection component itself must have a high tolerance to ESD events, at least capable of withstanding an ESD attack of 8kV in the IEC61000-4-2 contact mode..

Fifth and most importantly, the clamping voltage provided by ESD protection components during ESD events must be sufficiently low. In addition to providing protection against permanent damage caused by electrostatic discharge impacts on the protected circuit, it is also necessary to ensure that signal transmission is not disturbed by ESD..

ULC1811CDN meets the low capacitance parameter requirement of 18V, and the VC clamping voltage is low, which can safely protect the long-term reliability of NFC interface antennas. It can be compatible with SemtechRClamp1851ZA and HSP181-2W3Y parameters..
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