Zaɓin kaurin babban PCB ya zama batun lokacin da buga kewaye hukumar (PCB) mai ƙira yana karɓar ƙira yana buƙatar ƙirar multilayer kuma buƙatun kayan ba su cika ko ba a faɗi kwata -kwata. Wani lokaci wannan yana faruwa saboda haɗin abubuwan PCB na asali waɗanda aka yi amfani da su ba su da mahimmanci don yin aiki; If the overall thickness requirement is met, the end user may not care about the thickness or type of each layer.

Amma a wasu lokutan, wasan kwaikwayon ya fi mahimmanci kuma kaurin yana buƙatar kulawa sosai don ingantaccen aiki. If the PCB designer clearly communicates all requirements in the documentation, then the manufacturer will know what the requirements are and will set the materials accordingly.

Batutuwa masu zanen PCB suna buƙatar yin la’akari da su

Yana taimaka wa masu zanen kaya su fahimci kayan da ake samu kuma galibi ana amfani da su, don haka za su iya amfani da ƙa’idodin ƙira masu dacewa don gina PCBS cikin sauri da daidai. Abin da ke biyo baya shine taƙaitaccen bayanin abin da masana’antun nau’ikan kayan suka fi son amfani da su, da abin da za su buƙaci su juya aiki cikin sauri ba tare da jinkirta aikin ku ba.

Fahimci farashin laminate PCB da kaya

Yana da mahimmanci a fahimci cewa ana siyar da kayan laminate na PCB kuma suna aiki a cikin “tsarin” kuma babban kayan da prepreg wanda mai ƙera ya riƙe don amfani da gaggawa yawanci daga tsarin iri ɗaya ne. In other words, the constituent elements are all parts of a particular product, but with some variations, such as thickness, copper weight and prepreg style. Baya ga saba da maimaitawa, akwai wasu dalilan da za a adana iyakance nau’ikan nau’ikan laminate.

An tsara tsarin prepreg da na ciki don yin aiki tare, amma maiyuwa bazai yi aiki daidai lokacin amfani dashi tare da wasu samfura. For example, the Isola 370HR core material will not be used in the same stack as the Nelco 4000-13 prepreg. It’s possible they’ll work together in some situations, but more likely they won’t. Tsarin matasan yana kai ku zuwa yankin da ba a san shi ba, inda ba za a sake ɗaukar halayen kayan (sanannun lokacin amfani da su azaman tsarin kama -karya) ba. Careless or unwitting mixing and matching of material types can lead to serious failures, so no manufacturer will mix and match unless the type is proven to be suitable for “mixed” stacking.

Wani dalilin da zai sa a ƙuntata kayan ƙira shine babban farashin takaddar UL, don haka yana da yawa a cikin masana’antar PCB don iyakance adadin takaddun shaida zuwa ƙaramin zaɓi na kayan aiki. Manufacturers will often agree to make products on laminate without standard stock, but be aware that they cannot provide UL certification through QC documentation. Wannan zaɓi ne mai kyau don ƙirar da ba UL ba idan an bayyana shi kuma an yarda da shi a gaba kuma masana’anta sun saba da buƙatun sarrafawa na tsarin laminating da ake tambaya. For UL work, it is best to find out the manufacturer inventory of your choice and design boards to match it.

Ipc-4101d and foil construction

Yanzu da waɗannan bayanan sun fito fili, akwai wasu abubuwa biyu da ya kamata ku sani kafin tsalle cikin ƙira. Na farko, yana da kyau a saka laminates bisa ga ƙayyadaddun masana’antu IPC-4101D kuma ba don ambaton takamaiman samfuran da ba kowa ke iya mallaka ba.

Secondly, it is easiest to construct multiple layers using the “foil” construction method. Gina bango yana nufin cewa saman da ƙasa yadudduka (na waje) an yi su ne daga farantin jan ƙarfe guda ɗaya kuma an ɗora su zuwa sauran yadudduka tare da prepreg. Duk da yake yana iya zama kamar mai hankali don gina PCB 8-Layer tare da murjani mai kusurwa huɗu, zai fi dacewa a yi amfani da foil a waje na farko, sannan murjani uku don L2-L3, L4-L5, da L6-L7. A takaice dai, yi shirin tsara tari mai ɗimbin yawa domin adadin murjani ya kasance kamar haka: (jimlar adadin yadudduka da aka rage 2) an raba su 2. Na gaba, yana da amfani sanin wani abu game da mahimman kayan. Kansu.

Ana ba da gindin a cikin cikakkiyar warkar da PIECE na FR4 tare da jan tagulla a ɓangarorin biyu. Cores suna da kauri iri -iri, kuma galibi ana amfani da girman da aka saba amfani da su a manyan hannun jari. Waɗannan su ne kauri don tunawa, musamman lokacin da kuke buƙatar yin oda samfuran juyawa da sauri don kada ku ɓata lokacin jagorar odar don jiran kayan da ba na yau da kullun ba don zuwa daga mai rarrabawa.

Common baƙin ƙarfe core da jan kauri

Abubuwan da aka fi amfani da su don gina 0.062 “masu kauri masu kauri sune 0.005”, 0.008 “, 0.014”, 0.021, 0.028 “, da 0.039”. Inventory na 0.047 “shima na kowa ne, kamar yadda ake amfani da shi wani lokaci don gina allon 2-Layer. Sauran ginshikin da za a adana a koyaushe shine 0.059 in., Domin ana amfani da shi don samar da alluna 2-ply waɗanda suke 0.062 a ciki. Kauri, amma ana iya amfani da shi don katako mai ninka kauri, kamar 0.093 a. Don wannan matsayin, muna iyakance iyakokin zuwa ƙirar ƙira tare da kauri mara ƙima na ƙarshe na inci 0.062.

Kauri na jan ƙarfe yana zuwa daga rabin oza zuwa uku zuwa huɗu na oza, ya danganta da gaɓoɓin samfuran masana’anta, amma yawancin hannun jari na iya kasancewa cikin oza biyu ko ƙasa da haka. Ka riƙe wannan a zuciya kuma ka tuna cewa kusan duk hannun jari za su yi amfani da nauyin jan ƙarfe iri ɗaya a ɓangarorin biyu na ainihin. Yi ƙoƙarin guje wa buƙatun ƙirar PCB waɗanda ke buƙatar jan ƙarfe daban -daban a kowane gefe, kamar yadda sau da yawa wannan yana buƙatar siye na musamman kuma yana iya buƙatar cajin gaggawa (isar da hanzari), wani lokacin ma ba ma saduwa da mafi ƙarancin umarni na mai rarraba ba.

Misali, idan kuna son amfani da 1oz na jan ƙarfe akan jirgin sama kuma kuyi shirin amfani da siginar H oz, yi la’akari da yin jirgin sama a cikin H oz ko ƙara siginar zuwa 1oz don yin babban amfani da ɓangarorin biyu kamar jan ƙarfe mai nauyi. Tabbas, zaku iya yin wannan kawai idan har yanzu kuna iya biyan buƙatun lantarki na ƙira kuma kuna da isassun wuraren XY don karɓar ƙa’idodin ƙaƙƙarfan alama/sarari don saduwa da mafi ƙarancin 1oz a layin siginar. Idan za ku iya cika waɗannan sharuɗɗan, zai fi kyau ku yi amfani da shi kamar nauyin tagulla. In ba haka ba, kuna iya buƙatar la’akari da ƙarin ƙarin kwanaki na lokacin jagora.

Tunanin cewa kun zaɓi kauri mai mahimmanci da nauyi na jan ƙarfe, ana amfani da haɗe -haɗe daban -daban na zanen prepreg don kafa sauran wuraren wutar lantarki har sai an cika kaurin da ake buƙata. Don ƙirar da ba ta buƙatar kulawar rashin ƙarfi, zaku iya barin zaɓin prepreg ga mai ƙira. Za su yi amfani da sigar “daidaitaccen” da suka fi so. A gefe guda, idan kuna da buƙatun rashin ƙarfi, faɗi waɗannan buƙatun a cikin takaddun don mai ƙera ya iya daidaita adadin prepreg tsakanin cores don saduwa da ƙayyadaddun ƙimar.

Rashin ikon sarrafawa

Ko ana buƙatar sarrafa rashin ƙarfi ko a’a, ba a ba da shawarar cewa ku yi ƙoƙarin yin rikodin nau’in da kaurin prepreg ga kowane wuri sai dai idan kun ƙware a wannan aikin.Sau da yawa, irin waɗannan cikakkun bayanai na ƙarshe suna buƙatar daidaitawa, don haka suna iya haifar da jinkiri. Maimakon haka, zanen tari ɗinku na iya nuna ainihin kauri na ma’aunin layin ciki kuma yana nuna “matsayin prepreg da ake buƙata dangane da rashin ƙarfi da buƙatun kauri gaba ɗaya”. This allows manufacturers to create ideal laminations to match your design.

Bayanin

Kyakkyawan tari na abubuwan da aka dogara da su na da mahimmanci yana da mahimmanci don guje wa jinkirin da ba dole ba lokacin yin odar juyawa da sauri tare da tsayayyun lokutan lokaci. Yawancin masana’antun PCB suna amfani da nau’ikan tsarin multilayer iri ɗaya dangane da kwaya ɗaya kamar yadda masu fafatawa da su. Sai dai idan PCB an keɓance shi sosai, babu sihiri ko ginin sirri. Sabili da haka, yana da kyau ku san kanku da kayan da aka fi so don takamaiman sashi da yin kowane ƙoƙari don tsara PCB don dacewa da shi. A koyaushe za a keɓe don takamaiman buƙatun ƙira, amma gabaɗaya, daidaitattun kayan sune mafi kyawun zaɓi.