【选型】电动剪刀USB2.0端口ESD防护推荐国产ESD保护二极管阵列,结电容典型值仅0.6pF
电动剪刀一般配有一个USB2.0数据通信端口,为避免人体接触热插拔产生的ESD造成USB数据信号线,通常需要在USB数据传输信号线USB+/USB-上以及VCC上加抗ESD防护器件,选型因素参考如下:
1、低结电容:保证传输数据信号的完整性;
2、小体积:为满足电动剪刀小型化设计需求,尽量选择小尺寸表面贴装ESD抑制器;
3、高抗ESD能力:符合IEC 61000-4-2(ESD),4级(±15kV空气,±8kV接触放电);
针对如上的需求,推荐选择硕凯(SOCAY)超低电容ESD保护二极管阵列SR05-4B,采用SOT-26封装,可提供4条I/O数据信号线ESD防护,以及VCC电源ESD防护等,最大反向工作电压VRWM为5V,最大结电容Cj为0.8pF(Between I/O and GND), 典型电性参数参考如下图1所示。
图1:硕凯(SOCAY)超低电容ESD保护二极管阵列SR05-4B 典型电性参数
考虑到电动剪刀只用1个USB2.0端口,设计时有2路I/O信号线选择NC不用即可,ESD防护方案参考如下图2所示。
图2:硕凯(SOCAY)超低电容ESD保护二极管阵列SR05-4B用于USB2.0端口信号线ESD防护示意图
推荐理由如下:
1、SR05-4B可用于根据IEC61000-4-2提供±8kV接触和±15kV空气放电的ESD保护能力;
2、最大结电容仅0.8pF,有助于维护信号完整性,并最大限度地减少数据丢失;
3、最大钳位电压低至12V @IPP=1A,低钳位电压能力对USB信号线提供高可靠性性能保证;
4、市场上有成熟的应用设计,产品性能得到验证;
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电子商城
品牌:硕凯电子
品类:ESD Protection Transient Voltage Suppressors Array
价格:¥0.2240
现货: 118
品牌:SLKOR
品类:Ultra Low Capacitance ESD Protection Diodes Array
价格:¥0.2500
现货: 50
服务
测试等级:空气放电30KV±5%;接触放电30KV±5%,适用标准:GB/T 17626.2、IEC61000-4-2、ISO10605、GB/T 19951;给用户产品出电路保护设计方案建议及整改。点击预约,支持到场/视频直播测试,资深专家全程指导。
实验室地址: 深圳/上海 提交需求>
测试1.2/50us-8/20us组合波,10/700us-5/320us组合波,8/20us单波。能够模拟雷电瞬变引起的浪涌冲击抗干扰测试,最高电压达20KV,电流达20KA。点击预约,支持到场/视频直播测试,资深专家全程指导。
实验室地址: 深圳/上海 提交需求>
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