RS-232接口(kou)是現在主流的串行(xing)(xing)通信(xin)接口(kou)之一，符合美(mei)國電(dian)子工業聯盟制定的串行(xing)(xing)數據(ju)通信(xin)的接口(kou)標準，原始編號(hao)(hao)全稱為EIA-RS-232（簡稱232和RS-232），廣(guang)泛應用(yong)(yong)(yong)于計算機(ji)(ji)串行(xing)(xing)接口(kou)外(wai)設連接，連接電(dian)纜(lan)和機(ji)(ji)械、電(dian)氣(qi)特性、信(xin)號(hao)(hao)功能及(ji)傳送過(guo)程(cheng)。RS-232串行(xing)(xing)接口(kou)在信(xin)號(hao)(hao)傳輸過(guo)程(cheng)中，很容易受到(dao)浪涌、電(dian)壓(ya)、靜電(dian)的影響(xiang)。為此，不少工程(cheng)師為RS-232串口(kou)芯片保護(hu)焦頭爛額，不知道選用(yong)(yong)(yong)什么(me)(me)型號(hao)(hao)的TVS瞬態抑制二極管(guan)進(jin)行(xing)(xing)防護(hu)？為什么(me)(me)RS-485通訊(xun)端口(kou)上用(yong)(yong)(yong)7V的TVS管(guan)保護(hu)，而RS-232接口(kou)要用(yong)(yong)(yong)15V的TVS管(guan)呢？

針對各(ge)類通信端(duan)口（RS-485、RS-232、USB、HDMI、CAN BUS總(zong)線、I2C、RJ45、POE等各(ge)類網(wang)口）的浪(lang)涌靜(jing)(jing)電(dian)防護(hu)(hu)(hu)方案(an)(an)，電(dian)路(lu)保(bao)護(hu)(hu)(hu)器(qi)件廠家(jia)東沃電(dian)子工(gong)程師深有研究，能夠結合(he)客(ke)戶的實際應用(yong)和保(bao)護(hu)(hu)(hu)需求來設(she)計或整改方案(an)(an)、保(bao)護(hu)(hu)(hu)器(qi)件選型推薦，并免(mian)費提供樣品進(jin)行(xing)測(ce)試(shi)。接下(xia)來，東沃電(dian)子要分享的話題是RS-232接口靜(jing)(jing)電(dian)保(bao)護(hu)(hu)(hu)方案(an)(an)設(she)計圖：

從保護方案設計圖可以看出，該(gai)方案滿足ESD Contact Discharge: 8KV, Air Discharge: 15KV IEC61000-4-2 Level 4，保護器(qi)件選用(yong)了一顆(ke)TVS二極管DW15M2T-B-S，雙向、低漏(lou)電流、低鉗位電壓、SOT-23封裝，具體(ti)參數查看東沃電子DW15M2T-B-S產品手冊可知：

DW15M2T-B-S雙向TVS二(er)極管的應用：RS-232, RS-422 & RS-485, cellular handsets and accessories, control & monitoring systems, portable electronics, set-Top box, servers, notebook, and desktop PC, wireless bus protection. 想了解更多有關RS-232串口保護方案、TVS二極管選型、DW15M2T-B-S參數、報價、交期、樣品等信息，可直接聯系東沃電子：136 7581 6901（微信同號）朱工