東沃電子自主研(yan)發、生產、銷售的TVS二極管LDP13A/LDP13CA,符合(he)AEC-Q101汽車質量標(biao)準,可(ke)通過7637-5a/5b測試標(biao)準;現貨庫存、閃(shan)電發貨、品質卓越(yue)、廠(chang)家價格;免費測試、免費方案、免費樣品!
參數詳解
? VRWM :截(jie)止電壓(ya), TVS二極(ji)(ji)(ji)管(guan)的最(zui)高工作(zuo)電壓(ya),可連續施加而不(bu)引起TVS二極(ji)(ji)(ji)管(guan)劣化或(huo)損壞狀態下(xia),達到的最(zui)大(da)的直流(liu)(liu)電壓(ya)或(huo)交流(liu)(liu)峰(feng)值電壓(ya)。 在VRWM下(xia),TVS二極(ji)(ji)(ji)管(guan)是不(bu)工作(zuo)的,不(bu)導通(tong)。
? VC:鉗位電壓,施加規(gui)定波(bo)形的(de)峰值脈沖電流IPP時,TVS二(er)極管兩端測得的(de)峰值電壓。
? VBR:擊穿電壓,是TVS管(guan)的最小雪崩電壓。指在(zai)V-I特(te)性曲(qu)線上,在(zai)規定的脈沖直流電流IT或接近發生雪崩的電流條件下測得TVS兩端的電壓。
? IR:漏電(dian)(dian)流(liu),亦稱待機電(dian)(dian)流(liu)。在(zai)規定溫度和最(zui)高工作電(dian)(dian)壓條件下,流(liu)過TVS二極管的最(zui)大電(dian)(dian)流(liu),其值是在(zai)截止電(dian)(dian)壓下測量的。
? IPP:峰(feng)值(zhi)脈沖電流(liu),壹(yi)般在(zai)10/1000μs電流(liu)波形下的峰(feng)值(zhi)。
? IT:測試(shi)電流。
? C:電(dian)容(rong)值,對於同功率等級的(de)TVS管而言,電(dian)壓越低電(dian)容(rong)值就越大。在通信線路的(de)防護中,尤其要註(zhu)意TVS管的(de)電(dian)容(rong)值。
? 封裝(zhuang)(zhuang)形式(shi)(shi):從(cong)TVS管的封裝(zhuang)(zhuang)形式(shi)(shi),可以看出其(qi)功(gong)率(lv)大小(xiao)。TVS管的芯片面積直接決定其(qi)功(gong)率(lv)等(deng)級。
如何區分TVS二極管的單雙向?
1)看標誌:tvs管,有(you)單向和雙向之分,單向的壹(yi)端呢(ni),有(you)細(xi)色環,接的是正極,而雙向的呢(ni),中間有(you)兩道環,或(huo)者沒(mei)有(you)任何標誌,沒(mei)極性。
2)看規格書(shu):壹(yi)般(ban)在第壹(yi)頁(ye),雙(shuang)向(xiang)(xiang)為雙(shuang)向(xiang)(xiang)導通(tong),單向(xiang)(xiang)為單向(xiang)(xiang)導通(tong)。
3)看型號:tvs管的型號命名是有規(gui)律的,大部分tvs管型號均能(neng)看出參(can)數(shu)。如TVS管LDP13A/LDP13CA,尾綴後面(mian)是A的表示單向,尾綴CA的表示雙向。
4)借助(zhu)萬(wan)用表工具(ju):單(dan)向(xiang)壹邊又電壓,直(zhi)流方面(mian)有雪崩擊(ji)穿特(te)性;雙(shuang)向(xiang)都有電壓,直(zhi)流方面(mian),雙(shuang)向(xiang)對稱。
TVS二極管選型註意事項
1)最高(gao)(gao)(gao)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)VRWM :在(zai)(zai)電(dian)(dian)(dian)(dian)路(lu)正常工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)情況下(xia)(xia),TVS二(er)極管(guan)(guan)是不工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)的(de),處於截止狀態,所(suo)(suo)以TVS二(er)極管(guan)(guan)的(de)截止電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)應大(da)於被保(bao)護電(dian)(dian)(dian)(dian)路(lu)的(de)最高(gao)(gao)(gao)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)。這(zhe)樣才能保(bao)證TVS在(zai)(zai)電(dian)(dian)(dian)(dian)路(lu)正常工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)下(xia)(xia)不會(hui)影響電(dian)(dian)(dian)(dian)路(lu)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)。但是TVS二(er)極管(guan)(guan)的(de)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)高(gao)(gao)(gao)低也決(jue)定了(le)TVS二(er)極管(guan)(guan)鉗(qian)位電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)的(de)高(gao)(gao)(gao)低,在(zai)(zai)截止電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)大(da)於線路(lu)正常工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)的(de)情況下(xia)(xia),TVS二(er)極管(guan)(guan)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)也不能選(xuan)取的(de)過高(gao)(gao)(gao),如果太高(gao)(gao)(gao),鉗(qian)位電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)也會(hui)較高(gao)(gao)(gao),所(suo)(suo)以在(zai)(zai)選(xuan)擇 VRWM時,要綜合考慮被保(bao)護電(dian)(dian)(dian)(dian)路(lu)的(de)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)及後級(ji)電(dian)(dian)(dian)(dian)路(lu)的(de)承(cheng)受(shou)能力。
2)TVS功(gong)率選型 :TVS二(er)極管產品的額(e)定瞬(shun)態功(gong)率應大於電(dian)路中(zhong)可(ke)能出現的最大瞬(shun)態浪湧功(gong)率。
3)VC鉗位(wei)電壓:TVS二(er)極管(guan)鉗位(wei)電壓應小(xiao)於(wu)後級(ji)被(bei)保護(hu)電路(lu)最大可承受的(de)瞬態安全電壓,大多數TVS管(guan)的(de)VC與VBR及IPP都成正比。對於(wu)同壹功率等級(ji)的(de)TVS管(guan),其擊穿(chuan)電壓越高VC也越高。
4)IR 漏(lou)電(dian)流:在壹些(xie)低(di)功耗(hao)電(dian)路(lu)(lu)(lu)或高(gao)精度采集電(dian)路(lu)(lu)(lu)中,IR過(guo)大(da)可能(neng)(neng)導致電(dian)路(lu)(lu)(lu)功耗(hao)過(guo)大(da)或信號的(de)(de)采集精度超標(biao)。因低(di)壓(VRWM<10V)TVS管(guan)的(de)(de)IR較(jiao)大(da),如(ru)果後級電(dian)路(lu)(lu)(lu)耐受能(neng)(neng)力較(jiao)強的(de)(de)話,盡量選擇 10V或以上的(de)(de)TVS管(guan);如(ru)果後級電(dian)路(lu)(lu)(lu)耐受能(neng)(neng)力不足(zu),需要選擇小IR且低(di)電(dian)壓的(de)(de)TVS管(guan),東沃電(dian)子就可以提供(gong)這類(lei)產品。
5)C結電(dian)(dian)容:TVS管的結電(dian)(dian)容壹(yi)般在幾(ji)(ji)十(shi)皮法至幾(ji)(ji)十(shi)納法。對於同壹(yi)功率(lv)等級的TVS管,其電(dian)(dian)壓越低,電(dian)(dian)容值越大。在壹(yi)些(xie)通信(xin)線(xian)路中,要特別註(zhu)意(yi)TVS管的結電(dian)(dian)容,不能影響電(dian)(dian)路正常工(gong)作(zuo)。
6)封(feng)裝形(xing)式(shi):壹(yi)般(ban)來(lai)說(shuo),TVS管(guan)的功(gong)率(lv)從封(feng)裝形(xing)式(shi)上(shang)也可(ke)以(yi)體現,封(feng)裝體積越(yue)小,其功(gong)率(lv)壹(yi)般(ban)也越(yue)小,這是(shi)因為TVS管(guan)的芯片面積直接決(jue)定(ding)了(le)TVS管(guan)的功(gong)率(lv)等級。東沃電子的電路工程師(shi)會根(gen)據電路設計及測試要(yao)求(qiu)為您選擇合適封(feng)裝的TVS二極管(guan)。
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