PCB封装库网站

https://www.snapeda.com/home/

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https://componentsearchengine.com/index.html

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AD官网库（新）

https://designcontent.live.altium.com/#UnifiedComponents

AD官网库（旧）-适用于含AD10在内的之前的版本

https://techdocs.altium.com/display/ADOH/Download+Libraries