瞬(shun)(shun)(shun)(shun)變電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)抑制(zhi)(zhi)二極管(guan)選型(xing)過(guo)程中，其工(gong)(gong)作(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)是(shi)一個很重要(yao)的(de)參(can)數(shu)，也(ye)是(shi)選型(xing)第(di)一步就(jiu)需(xu)要(yao)確認(ren)的(de)參(can)數(shu)。瞬(shun)(shun)(shun)(shun)態電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)抑制(zhi)(zhi)二極管(guan)工(gong)(gong)作(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)確認(ren)之前，先(xian)要(yao)確定(ding)被保護(hu)電(dian)(dian)(dian)(dian)路中的(de)最高(gao)工(gong)(gong)作(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)。瞬(shun)(shun)(shun)(shun)態電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)抑制(zhi)(zhi)二極管(guan)工(gong)(gong)作(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)要(yao)大于(yu)被保護(hu)電(dian)(dian)(dian)(dian)路中的(de)最高(gao)工(gong)(gong)作(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)，在(zai)Vrwm下，TVS是(shi)不(bu)工(gong)(gong)作(zuo)(zuo)的(de)，也(ye)不(bu)導(dao)通，也(ye)不(bu)會影響電(dian)(dian)(dian)(dian)路的(de)正常(chang)工(gong)(gong)作(zuo)(zuo)。關于(yu)瞬(shun)(shun)(shun)(shun)變電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)抑制(zhi)(zhi)二極管(guan)工(gong)(gong)作(zuo)(zuo)原理(li)，如下圖所(suo)示：

查(cha)閱東沃(wo)電(dian)(dian)子瞬變(bian)(bian)電(dian)(dian)壓抑(yi)(yi)制(zhi)二極(ji)管(guan)產品選型手(shou)冊可(ke)知，其(qi)工作電(dian)(dian)壓低至3.3V，高達600V，甚至更(geng)高。常(chang)有客戶向東沃(wo)電(dian)(dian)子咨詢(xun)工作電(dian)(dian)壓350V的(de)瞬變(bian)(bian)電(dian)(dian)壓抑(yi)(yi)制(zhi)二極(ji)管(guan)。那么，350V瞬變(bian)(bian)電(dian)(dian)壓抑(yi)(yi)制(zhi)二極(ji)管(guan)型號有哪(na)些呢？

查閱東(dong)沃(wo)電(dian)子(zi)TVS產品選型手(shou)冊(ce)可知(zhi)，350V電(dian)壓(ya)的瞬變(bian)電(dian)壓(ya)抑制二極(ji)管，根(gen)據直(zhi)插和貼(tie)片分(fen)，有：

1）350V直(zhi)插TVS：3KP350A（單向(xiang) 封(feng)裝(zhuang)P600 功(gong)率3000W）、3KP350CA（雙(shuang)向(xiang) 封(feng)裝(zhuang)P600 功(gong)率3000W）、5KP350A（單向(xiang) 封(feng)裝(zhuang)P600 功(gong)率5000W）、5KP350CA（雙(shuang)向(xiang) 封(feng)裝(zhuang)P600 功(gong)率5000W）。

2）350V貼片TVS：SMF350A（單(dan)(dan)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)SOD-123 功(gong)率(lv)(lv)(lv)200W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)YK）、SMAJ350A（單(dan)(dan)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AC 功(gong)率(lv)(lv)(lv)400W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)DG）、SMAJ350CA（雙(shuang)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AC 功(gong)率(lv)(lv)(lv)400W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)HG）、SMBJ350A（單(dan)(dan)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AA 功(gong)率(lv)(lv)(lv)600W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)QG）、SMBJ350CA（雙(shuang)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AA 功(gong)率(lv)(lv)(lv)600W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)FG）、SMCJ350A（單(dan)(dan)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AB 功(gong)率(lv)(lv)(lv)1500W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)GJG）、SMCJ350CA（雙(shuang)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AB 功(gong)率(lv)(lv)(lv)1500W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)BJG）、SMDJ350A（單(dan)(dan)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AB 功(gong)率(lv)(lv)(lv)3000W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)PJG）、SMDJ350CA（雙(shuang)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AB 功(gong)率(lv)(lv)(lv)3000W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)DJG）、5.0SMDJ350A（單(dan)(dan)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AB 功(gong)率(lv)(lv)(lv)5000W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)5PJG）、5.0SMDJ350CA（雙(shuang)向(xiang) 封(feng)(feng)(feng)裝(zhuang)(zhuang)(zhuang)(zhuang)DO-214AB 功(gong)率(lv)(lv)(lv)5000W 絲(si)(si)(si)(si)(si)印(yin)(yin)(yin)(yin)(yin)(yin)5BJG）。

雙向瞬變電壓抑制二極管5.0SMDJ350CA參數：
工作電壓：350V
擊穿電壓（最小值）：391.00V
擊穿電壓（最大值）：432.00V
測試電流：1mA
鉗位電壓：567.0V
峰值脈沖電流@10/1000μs：8.82A
峰值脈沖功率@10/1000μs：5000W
漏電流：5uA
絲印標識：5BJG
封裝形式：SMC（DO-214AB）
極性：雙向

瞬變電壓抑(yi)制(zhi)二極管選型選用過程中，除了工作電壓之外，重要的參數還有鉗位電壓、擊穿電壓、峰值脈沖電流、功率、封裝、漏電流等等。可見，TVS選型，是一門很大的學問，350V瞬態電壓抑制二極管型號齊全，具體選用哪個料號，還需要根據電路情況和保護需求來定奪！