标准USB Type-A接口是第一代USB接口。 Type-A经历了第一代USB 1.0到最新的USB 3.2，已有24年的持续生命周期。这实在是一个奇迹，因为它存在于如此快速发展的行业，不断伴随着更快更好的新产品替代旧版本的产品。
从下图中我们可以看到初代的Type-A接口包含四个引脚。它们分别连接两条电源线和两条信号线。 USB 3.0版本的Type-A接口增加到9针，但外壳外观没有改变。 Type-A作为最经典的接口，多用于鼠标、键盘、U盘等外设。早在 2004 年，全球就有超过 1 亿个USB 设备。事实上，USB Type-A接口已经不仅仅是一个简单的接口了。这是一项历史悠久的技术，深深植根于人们的日常习惯中。试想一下，如果有一天 USB Type-A 完全退役，所有的鼠标和键盘都被全新的、不熟悉的接口所取代。我们是否会怀念这个总是与正确插头混淆的旧 Type-A 端口？
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