【选型】重复性记录仪模块RS232端口ESD防护设计推荐ESD阵列SE15T2U02GC，接触放电能力达±30kV

时间： 2022-12-23 来源：世强

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为避免重复性记录仪模块RS232端口因热插拔或人体接触放电导致相关敏感电子元件被打死，通常需要给RS232端口加上ESD防护二极管，选型条件参考如下：

1、至少通过IEC 61000-4-2接触放电±8kV，空气放电±15kV；

2、 RS232信号电平电压由所使用的线路驱动器决定，但在大多数情况下，最大值12V~15V，建议选择最大反向工作电压15V；

3、考虑到RS232端口传输速率较低，仅0.2Mbit/s，对容值要求不高，一般选择小于100pF即可；

针对如上设计需求，推荐硕凯电子 ESD阵列 SE15T2U02GC，采用SOT23-3L封装，最大反向工作电压15V，典型结电容20pF，通过IEC 61000-4-2 ESD Contact ±30kV/ Air ±30kV，工作温度范围-55~125℃，典型电性参数参考如下图1所示。

图1：硕凯电子ESD阵列SE15T2U02GC典型电性参数

推荐理由如下：

1、通过IEC61000-4-2接触放电±30kV，空气放电±30kV，具有高的抗ESD能力；

2、采用SOT23封装，单机用量4颗，对RxD、TxD、TRS、CTS等信号线静电防护，典型应用电路参考如下图2所示，满足小型化设计需求；

图2：硕凯电子ESD阵列SE15T2U02GC用于RS232端口静电防护典型应用框图

3、世强平台常备库存，具有良好的供货交期，可以快速支持样品和量产服务。

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