【应用】SOT143封装的国产ESD保护阵列可应用于USB 2.0端口保护

时间： 2021-04-19 来源：电安科技

技术问答

USB2.0的速度可以高达480Mbps，从而在工农业方面都有着广泛的应用。USB2.0接口的电压是：+5V ，电流：最大到1A。但实际使用上肯定存在误差，最大不能超过+/-0.2V 也就是4.8-5.2V 。USB芯片集成度高，但是十分脆弱，一旦受到静电攻击很容易损坏，在信号高速传输过程中不容忍丢包，所以设计时需要考虑抑制静电造成的瞬态过电压干扰，以保证传输质量和产品的可靠性。

针对此应用，电安推出1款SOT143封装的ESD保护阵列 TPA143L05,它有接触放电±15KV，空气放电±20KV的静电防护能力。其外形如下图：

其防护原理为当瞬时电压超过瞬态抑制二极管动作电压后，TVS便发生雪崩，给瞬态电流提供一个低阻抗通路，这样瞬时电流由低阻抗通路泄放掉，避开了被保护器件，并且在过电压持续过程中一直保持低阻抗放电状态。当瞬时脉冲结束以后，TVS自动回复高阻状态，整个回路进入正常电压。

其电路的典型接法如下图：

特点如下：

1、贴片SOT143封装

2、断态电压VRWM：5.0V

3、低漏电流IR：1µA

4、钳位电压VC：10V

5、结电容：0.65pF

应用场景：

笔记本电脑；

台式电脑；

网络打印机；

车载USB接口；

多媒体音响；

移动手持电子设备；

其他带有USB2.0接口的设备。

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本文由Bonnie转载自电安科技，原文标题为:【应用】SOT143封装的国产ESD保护阵列可应用于USB 2.0端口保护，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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Littelfuse（力特）电路保护产品选型指南

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