【选型】国产TVS阵列用于高速公路ETC系统HDMI接口ESD防护设计，典型容值低至0.6pF

时间： 2022-03-16 来源：世强

技术问答

高速公路ETC系统上会配有标准的HDMI接口，为避免其接口因静电影响造成传输的数据丢失或相关敏感电子器件被打死，可选择多通道低容值TVS阵列设计，选型条件参考如下：

1、高抗ESD：至少至少满足IEC 61000-4-2 (ESD) ±15kV (Air)、±8kV (Contact)测试能力；

2、小尺寸：选择阵列封装；

3、低容值，结电容小于1pF

针对如上设计需求，推荐硕凯电子四通道TVS阵列SE05NRE14GA，典型I/O对地电容低至0.6pF，采用DFN2510封装，最大反向工作电压5.0V，接触放电能力达±25kV，空气放电能力±17kV，工作温度范围-55~125℃，典型HDMI端口应用电路如下图1所示。

图1：硕凯电子TVS阵列SE05NRE14GA用于HDMI端口ESD防护典型应用示意图

推荐理由如下：

1、每个输入/输出电容低至0.6pF（typ），有助于维护信号完整性，并最大限度地减少数据丢失；

2、高抗ESD能力：提供高达±25kV/Air，±17kV/Contact ESD测试能力，具有出色的抗ESD能力；

3、走线采用“直通型”设计结构，可保障信号完整性、减少电压过冲并简化印刷电路板设计；

4、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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推荐使用硕凯（SOCAY）的ESD静电抑制二极管，推荐型号SE05NRE14GA，其主要特点：阵列型号ESD，节省PCB板子空间，静电Contact±17KV/Air±25KV，低容值（＜1pF），响应速度快（＜1ps），钳位电压精准（误差±5%）。具体见数据手册：https://www.sekorm.com/doc/1182907.html

技术问答发布时间 : 2019-04-11