USB C port input with overvoltage protection, two series lithium battery charging management board 8.4V 1A - PCB design scheme - Wuxi PWChip Semi Technology CO., LTD
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Amazon.com: Industrial USB to RS485 Converter Adapter with Original CH343G and SP485EEN, Built-in Lightningproof Tube, Resettable Fuse, ESD and TVS Protection Circuits, up to 1.2km RS485 Transmission Distance : Electronics
USB Type C Power Delivery and Protection
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diodes - Can anyone explain this USB ESD protection circuit? - Electrical Engineering Stack Exchange