東沃電子自主研發、生產、銷售的TVS二(er)極管LDP40A/LDP40CA,符合AEC-Q101汽(qi)車(che)質量標準,可通過7637-5a/5b測(ce)(ce)試(shi)標準,產品質量可靠性可與進口品牌(如(ru)VISHAY、ONSEMI、LITTLEFUSE等)媲美;現貨庫(ku)存、閃電發貨、品質卓越、廠家(jia)價格;免費測(ce)(ce)試(shi)、免費方案、免費樣品!
參數詳(xiang)解
? VRWM :截止(zhi)電(dian)壓(ya), TVS二極管(guan)的(de)最高工作(zuo)電(dian)壓(ya),可連續施加(jia)而不引起(qi)TVS二極管(guan)劣化(hua)或損壞狀態下(xia),達到(dao)的(de)最大的(de)直流電(dian)壓(ya)或交流峰值(zhi)電(dian)壓(ya)。 在VRWM下(xia),TVS二極管(guan)是不工作(zuo)的(de),不導通。
? VC:鉗位電(dian)(dian)壓,施加規(gui)定波形的峰值(zhi)(zhi)脈沖(chong)電(dian)(dian)流IPP時,TVS二極管兩(liang)端測(ce)得的峰值(zhi)(zhi)電(dian)(dian)壓。
? VBR:擊穿電(dian)壓(ya),是(shi)TVS管的(de)最(zui)小(xiao)雪崩電(dian)壓(ya)。指在V-I特性曲(qu)線上,在規(gui)定(ding)的(de)脈沖直(zhi)流(liu)電(dian)流(liu)IT或接(jie)近發(fa)生雪崩的(de)電(dian)流(liu)條件下測得TVS兩端(duan)的(de)電(dian)壓(ya)。
? IR:漏電流(liu),亦稱待機電流(liu)。在(zai)規定(ding)溫度和最高工作電壓(ya)條件(jian)下,流(liu)過TVS二極管的(de)最大電流(liu),其(qi)值是在(zai)截(jie)止電壓(ya)下測(ce)量的(de)。
? IPP:峰值(zhi)脈沖電流,壹般在10/1000μs電流波形下的峰值(zhi)。
? IT:測試電流(liu)。
? C:電(dian)容值,對於同功率等級的TVS管而言,電(dian)壓(ya)越低電(dian)容值就(jiu)越大。在(zai)通信線(xian)路(lu)的防護中,尤其要註意(yi)TVS管的電(dian)容值。
? 封裝形式:從TVS管的封裝形式,可(ke)以看(kan)出(chu)其功率(lv)大小。TVS管的芯(xin)片面積直接決定其功率(lv)等級。
如何(he)區分TVS二極管的單雙向?
1)看標誌(zhi)(zhi):tvs管,有(you)(you)單(dan)(dan)向和雙向之(zhi)分,單(dan)(dan)向的(de)壹端(duan)呢,有(you)(you)細色環,接的(de)是正極(ji)(ji),而雙向的(de)呢,中(zhong)間有(you)(you)兩道環,或者沒有(you)(you)任何標誌(zhi)(zhi),沒極(ji)(ji)性。
2)看規格書:壹般在(zai)第壹頁,雙向(xiang)(xiang)為(wei)雙向(xiang)(xiang)導通,單向(xiang)(xiang)為(wei)單向(xiang)(xiang)導通。
3)看型號:tvs管的(de)型號命名是(shi)有(you)規律的(de),大部分tvs管型號均能看出(chu)參(can)數(shu)。如TVS管LDP40A/LDP40CA,尾綴(zhui)後(hou)面是(shi)A的(de)表示單向(xiang),尾綴(zhui)CA的(de)表示雙向(xiang)。
4)借助萬(wan)用表工具(ju):單向壹(yi)邊(bian)又電(dian)壓,直流(liu)方面有雪崩擊穿特性;雙向都(dou)有電(dian)壓,直流(liu)方面,雙向對(dui)稱(cheng)。
TVS二極管(guan)選(xuan)型註意事(shi)項
1)最高(gao)(gao)工(gong)(gong)(gong)作(zuo)電(dian)(dian)(dian)壓(ya)(ya)(ya)VRWM :在(zai)電(dian)(dian)(dian)路(lu)正(zheng)常(chang)工(gong)(gong)(gong)作(zuo)情(qing)況下,TVS二(er)極(ji)(ji)(ji)管(guan)是不工(gong)(gong)(gong)作(zuo)的(de)(de),處於(wu)截止狀態(tai),所(suo)以TVS二(er)極(ji)(ji)(ji)管(guan)的(de)(de)截止電(dian)(dian)(dian)壓(ya)(ya)(ya)應大(da)於(wu)被(bei)保(bao)護電(dian)(dian)(dian)路(lu)的(de)(de)最高(gao)(gao)工(gong)(gong)(gong)作(zuo)電(dian)(dian)(dian)壓(ya)(ya)(ya)。這(zhe)樣才能(neng)保(bao)證TVS在(zai)電(dian)(dian)(dian)路(lu)正(zheng)常(chang)工(gong)(gong)(gong)作(zuo)下不會影響電(dian)(dian)(dian)路(lu)工(gong)(gong)(gong)作(zuo)。但(dan)是TVS二(er)極(ji)(ji)(ji)管(guan)的(de)(de)工(gong)(gong)(gong)作(zuo)電(dian)(dian)(dian)壓(ya)(ya)(ya)高(gao)(gao)低(di)也決(jue)定了(le)TVS二(er)極(ji)(ji)(ji)管(guan)鉗位電(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)(de)高(gao)(gao)低(di),在(zai)截止電(dian)(dian)(dian)壓(ya)(ya)(ya)大(da)於(wu)線路(lu)正(zheng)常(chang)工(gong)(gong)(gong)作(zuo)電(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)(de)情(qing)況下,TVS二(er)極(ji)(ji)(ji)管(guan)工(gong)(gong)(gong)作(zuo)電(dian)(dian)(dian)壓(ya)(ya)(ya)也不能(neng)選取的(de)(de)過高(gao)(gao),如果太高(gao)(gao),鉗位電(dian)(dian)(dian)壓(ya)(ya)(ya)也會較(jiao)高(gao)(gao),所(suo)以在(zai)選擇 VRWM時,要綜合考慮(lv)被(bei)保(bao)護電(dian)(dian)(dian)路(lu)的(de)(de)工(gong)(gong)(gong)作(zuo)電(dian)(dian)(dian)壓(ya)(ya)(ya)及後級電(dian)(dian)(dian)路(lu)的(de)(de)承受能(neng)力。
2)TVS功率(lv)選型 :TVS二(er)極管產品(pin)的(de)額定瞬態功率(lv)應(ying)大於(wu)電路中可能出現(xian)的(de)最大瞬態浪(lang)湧功率(lv)。
3)VC鉗位電(dian)壓:TVS二極管鉗位電(dian)壓應小於(wu)後級被保護電(dian)路(lu)最大(da)可承受(shou)的(de)瞬態安(an)全電(dian)壓,大(da)多數TVS管的(de)VC與VBR及IPP都成正(zheng)比。對於(wu)同壹功率等(deng)級的(de)TVS管,其擊穿電(dian)壓越高(gao)VC也越高(gao)。
4)IR 漏電(dian)(dian)流(liu):在壹些低功(gong)耗電(dian)(dian)路或高精度采集電(dian)(dian)路中,IR過大(da)可能導致電(dian)(dian)路功(gong)耗過大(da)或信號的(de)采集精度超標。因低壓(VRWM<10V)TVS管(guan)的(de)IR較大(da),如(ru)果後(hou)級電(dian)(dian)路耐受能力較強的(de)話,盡(jin)量(liang)選(xuan)擇 10V或以上的(de)TVS管(guan);如(ru)果後(hou)級電(dian)(dian)路耐受能力不足,需要選(xuan)擇小IR且低電(dian)(dian)壓的(de)TVS管(guan),東(dong)沃(wo)電(dian)(dian)子就(jiu)可以提(ti)供這(zhe)類產(chan)品。
5)C結電(dian)(dian)(dian)(dian)容:TVS管(guan)的結電(dian)(dian)(dian)(dian)容壹般在幾十皮法至幾十納(na)法。對於同壹功率(lv)等級(ji)的TVS管(guan),其(qi)電(dian)(dian)(dian)(dian)壓越低,電(dian)(dian)(dian)(dian)容值越大(da)。在壹些通信線(xian)路中,要(yao)特(te)別註意TVS管(guan)的結電(dian)(dian)(dian)(dian)容,不能影響電(dian)(dian)(dian)(dian)路正(zheng)常工作。
6)封(feng)裝形(xing)式:壹般來說,TVS管的(de)功(gong)率從封(feng)裝形(xing)式上也可以體現,封(feng)裝體積(ji)越小,其(qi)功(gong)率壹般也越小,這是因為(wei)(wei)TVS管的(de)芯(xin)片面積(ji)直(zhi)接(jie)決定了(le)TVS管的(de)功(gong)率等(deng)級。東沃電(dian)(dian)子的(de)電(dian)(dian)路(lu)(lu)工程師會(hui)根據(ju)電(dian)(dian)路(lu)(lu)設計及(ji)測試(shi)要求(qiu)為(wei)(wei)您選(xuan)擇合適封(feng)裝的(de)TVS二(er)極管。
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