An external I/O interface refers to a connector (USB, HDMI, Thunderbolt, etc.) used to connect to an external device.
External I/O interfaces are used in a wide variety of devices.
Examples: PCs, smartphones, TVs, tablets, printers, POS systems, speakers
If an external I/O interface makes contact with a person or object, this will generate static electricity.
There are many cases where this static electricity travels to an IC and causes a malfunction.
A TVS diode can be used in such cases to prevent this issue from occurring.
TVS diodes are ideal for applications requiring high-speed communications like USB and HDMI among external I/O interfaces.
TVS diodes can instantly protect against excessive voltage in the event of ESD intrusion compared to varistors and suppressors.
Moreover, the inter-terminal capacitance between the signal line and the GND generated by inserting the TVS diode is small under normal conditions without ESD intrusion. Therefore, it is possible to suppress degradation of the signal quality during high-speed signal input.
Below is a usage example and recommended part numbers of a TVS diode in USBs/HDMIs.
The recommended capacitance for USB and Thunderbolt is provided below.
Higher transmission speeds require parts with lower capacitance.
萝莉影视's recommended product for HDMI is shown below.