Izinto ze-PCB ze-TU-768: Imininingwane, Ukusebenza kanye nomhlahlandlela Wokuklama Osebenzayo

Izinto ze-PCB ze-TU-768 ziyi-laminate ye-epoxy FR-4 eguquliwe ene-Tg ephezulu eyenzelwe amabhodi anezingqimba eziningi adinga ukuzinza okuphezulu kokushisa kanye nokuhambisana kokuhlanganiswa okungenalo i-lead. Lo mhlahlandlela unikeza imininingwane ebalulekile, ukuhlaziywa kokusebenza, ukucatshangelwa komklamo, kanye nezindlela zokukhetha ukusiza onjiniyela benze izinqumo zezinto ezinolwazi ngempumelelo.

Imininingwane Yobuchwepheshe ye-TU-768 Ngokubuka Nje

Ukuqonda amapharamitha ayinhloko ezinto ze-TU-768 PCB kubalulekile ekuhloleni ukufaneleka kwazo ohlelweni lwakho lokusebenza. Ithebula elingezansi lifingqa amanani ayisihluthulelo eshidi ledatha athonya izinqumo zokuklama nezokukhiqiza.

Lezi zincazelo zibeka izinto ze-TU-768 PCB njengenketho eqinile yezinhlelo zokusebenza ezifuna ukuqina kokushisa ngaphandle kwezindleko eziphezulu zama-laminate akhethekile anokulahlekelwa okuncane.

Ukuhlaziywa Kokusebenza Okubalulekile kwe-TU-768

Ukusebenza Kagesi

I-TU-768 ibonisa i-dielectric constant (Dk) engu-4.3–4.4 ku-1–10 GHz, ene-loss tangent (Df) esukela ku-0.019 kuya ku-0.023. Lawa manani asekela imiklamo elawulwa yi-impedance efinyelela cishe ku-2–3 GHz enobuqotho besignali obamukelekayo. Kumafrikhwensi adlula i-5 GHz noma izinhlelo zokusebenza zedijithali ezisheshayo ezidinga i-Df ngaphansi kuka-0.010, cabanga ngezinto ezinikezelwe zokulahlekelwa okuncane njenge-laminate ekhethekile yokulahlekelwa okuncane noma uchungechunge lwe-Megtron.

Inothi Lonjiniyela: Kumamojula ajwayelekile e-RF front-end asebenza ngaphansi kwe-2 GHz, i-TU-768 inikeza ibhalansi engabizi kakhulu phakathi kokusebenza kukagesi nokuhambisana kokukhiqiza.

Ukusebenza Okushisayo Nemishini

Nge-Tg engu-190°C (DMA) kanye ne-Td engu-350°C, izinto ze-TU-768 PCB zisingatha imijikelezo eminingi yokugeleza okungenalo i-lead ngaphandle kokuwohloka kwesakhiwo. I-Z-axis CTE engu-2.7% inciphisa ngokucindezeleka kwebharele ngesikhathi sohambo lokushisa, okwenza ifaneleke kumadizayini anezinga eliphezulu ane-vias efihliwe noma izingxenye ze-BGA ezidinga ukuxhumana okuthembekile.

Inothi Lonjiniyela: Ezihlanganisweni ezine-BGAs ezicijile (≤0.5mm pitch), i-Z-CTE ephansi inciphisa ingozi yokuqhekeka kwemiphongolo ngesikhathi sokujikeleza kokushisa kusuka ku--40°C kuya ku-+125°C amabanga okusebenza.

Ukucutshungulwa Nokuthembeka

I-TU-768 ikhombisa ukuhambisana okuqinile nezinqubo ezijwayelekile zokwenziwa kwe-PCB okuhlanganisa ukubhoboza ngomshini, ukwakheka nge-laser, kanye nokufakwa kwe-copper ngaphandle kwe-electro. Izakhiwo zokuvimba i-UV zale nto kanye ne-AOI fluorescence kuthuthukisa ukunemba kokuhlolwa ekukhiqizweni okuphezulu. Amandla okuhlubula angu-7–9 lb/in aqinisekisa ukunamathela okuqinile kwe-copper ngokusebenzisa ukuphela kobuso be-HASL, ENIG, kanye ne-OSP.

Inothi Lonjiniyela: Uma ucacisa i-ENIG, qinisekisa ukuthi isabelomali sokushisa se-laminate sihambisana nomjikelezo owengeziwe wokugeleza kabusha ovame ukudingeka ezinqubweni zokufaka igolide.

Izicelo ze-TU-768 kanye namacala okusetshenziswa

Izinto ze-PCB ze-TU-768 zisebenza lapho ukuthembeka kokushisa kudlula isidingo sokulahlekelwa yi-dielectric ephansi kakhulu.

Imikhakha Ejwayelekile Yokusebenza

Izinhlelo zokulawula zezimboni ziyazuza ekuzinzeni kokushisa kwe-TU-768 ezindaweni ezinamazinga okushisa aphezulu noma ukujikeleza okuvamile kokushisa. Ama-elekthronikhi ezimoto, ikakhulukazi amamojula okulawula umzimba kanye nezinhlelo zokuzijabulisa, asebenzisa ukumelana kwe-CAF kanye nokuqina komswakama kwezinto. Ama-motherboard eseva nawendawo yokusebenza asebenzisa i-TU-768 ekwakheni izingqimba eziningi ezidlula izingqimba eziyi-8 lapho amanani e-Dk ahambisanayo esekela umzila we-impedance olawulwayo.

Isibonelo secala elisebenzayo

Umkhiqizi wemishini yezokuxhumana ubhekane nokwehluleka kokuxhumeka ngezikhathi ezithile ebhodini lokulawula lesiteshi esiyisisekelo esinezingqimba ezingu-12 esebenzisa i-mid-Tg FR-4 ejwayelekile. Ukuhlaziywa ngemva kokwehluleka kwembulwe ngokuqhekeka kwemigqomo ngemva kwemijikelezo yokushisa engaphezu kuka-200. Ukushintshela ezintweni ze-PCB ze-TU-768 kunciphisa ukucindezeleka kokunwetshwa kwe-Z-axis, kwasusa ukwehluleka kwensimu ngenkathi kugcinwa imithetho yokuklama ekhona kanye nomsebenzi wokukhiqiza. Ukushintshaniswa kwezinto kwanezela cishe u-8-12% ezindlekweni zezinto zokusetshenziswa kodwa kwagwema ukwakhiwa kabusha kwebhodi okubizayo.

Izindlela Ezinhle Zokuklama Nokukhiqiza

Iziqondiso Zokulawula Ukungavimbeli

Kuma-trace angu-50Ω aphela ngokuphela, i-stackup evamile isebenzisa ububanzi be-trace obungu-4.5 mil ngaphezu kwe-prepreg engu-4 mil nethusi elingu-1 oz. Cacisa ukubekezelela kwe-Dk okungu-±0.05 ngezendlalelo ze-impedance ezibalulekile. Cela amakhuphoni e-impedance kumenzi wakho ukuqinisekisa amanani angempela e-Dk ngaphambi kokukhishwa kokukhiqiza. Bala ukuhlukahluka kwe-Dk phakathi kwe-core kanye ne-prepreg lapho ubala isikhala se-differential pair kuma-stackups ezinto ezixubile.

Izincomo zephrofayili yokushisa

I-TU-768 isekela amaphrofayili ajwayelekile okuphinda ageleze ngaphandle komthofu anamazinga okushisa aphezulu afinyelela ku-260°C. Kumabhodi adlula ubukhulu obungu-2.0mm, yandisa indawo yokushisa kusengaphambili ibe yimizuzwana engu-120–180 ukuqinisekisa izinga lokushisa elifanayo eliyinhloko. Gwema amazinga okuma adlula ku-3°C/umzuzwana ukuze uvimbele ukuhlukaniswa ezindaweni zokuhlangana kwezingqimba. Kuzinhlelo zokusebenza zokufaka i-wave soldering, qinisekisa ukuthi isikhathi sokuvezwa ohlangothini olungezansi ku-260°C asidluli imizuzwana eyi-10 ukuze usigcine ngobuqotho.

Ukucubungula Nge-Via kanye Nemigodi

Ukubhoboza ngomshini kusebenza ngokuthembekile nge-TU-768 ephansi kuya ku-0.2mm (8 mil) yobukhulu bemigodi eqediwe. Ngezinhlelo zokusebenza ze-HDI ezine-microvias, ukubhoboza nge-laser kufeza ukuhlanzeka ngezindonga nge-resin smear encane. Cacisa ukwelashwa kwe-desmear ukuqinisekisa ukunamathela okuthembekile kwethusi okungena-electro emigodini enesilinganiso esiphezulu (>10:1). Ukuze kugqunywe ngezakhiwo, qinisekisa ingcindezi ye-lamination kanye nobude besikhathi nomenzi wakho ukuze uvimbele ukuntuleka kwe-resin ezindaweni ezingaphakathi.

Ukuhambisana Kwe-Surface Finish

I-ENIG inikeza ukushintshwa okuphezulu kanye nokuphila isikhathi eside kweshalofu kwezingxenye ze-fine-pitch kodwa yengeza ukucindezeleka kokushisa ngesikhathi senqubo yokucwiliswa kwegolide. I-HASL inikeza izinzuzo zezindleko ze-standard-pitch assemblies kodwa idala izindawo ze-pad ezingalingani ezingafaneleki kuma-BGA angu-0.4mm pitch. I-OSP inikeza ama-pad ayisicaba ngezindleko eziphansi kodwa idinga ukulawulwa kwenqubo okuqinile ngesikhathi sokuhlanganiswa. Kumabhodi obuchwepheshe obuxubile ahlanganisa ama-BGA kanye nezixhumi ze-through-hole, i-ENIG ivame ukunikeza ukuvumelana okungcono kakhulu phakathi kokuvunwa kwe-assembly kanye nokuthembeka kwesikhathi eside.

Izincomo Zokuhlola Ukuthembeka

Qinisekisa izinhlangano ze-TU-768 PCB ngokusebenzisa ukuhlolwa kokushaqeka kokushisa kwe-IPC-TM-650 (-55°C kuya ku-+125°C, imijikelezo eyi-100 okungenani). Yenza ukuhlolwa kwe-RH okungu-85°C/85% amahora angu-168 ukuqinisekisa ukumelana kwe-CAF. Yenza ukuhlaziywa kwesigaba esinqamulayo kumakhuphoni azinikele ukuqinisekisa ngekhwalithi yokugcwalisa kanye nokusatshalaliswa kobukhulu be-copper plating. Cela izindlela zokwamukelwa ze-IPC Class 3 zezinhlelo zokusebenza ezibalulekile ukuqinisekisa ikhwalithi ehambisanayo kuzo zonke izindawo zokukhiqiza.

Ukuqhathaniswa kwe-TU-768 Nezinto Ezihlukile

Ukukhetha i-laminate efanele kudinga ukuqonda ukuthi i-TU-768 ibeka kanjani uma iqhathaniswa nezinye izindlela ezivamile.

Izinzuzo ze-TU-768: Ihlinzeka ngokusebenza okuphezulu kwe-Tg ngentengo ephakathi, ngokukhuthazela okungcono kokushisa kune-FR-4 ejwayelekile kanye nokuqina kwe-Dk okufana nezinye izindlela ze-premium. Izinto zimele ibhalansi efanele yezinhlelo zokusebenza ezidinga ukuhambisana okungenalo i-lead ngaphandle kwezindleko zama-laminate akhethekile asheshayo.

Imikhawulo: Kuzinhlelo zokusebenza ezingaphezu kwe-5 GHz noma ezidinga i-Df ngaphansi kwe-0.010, izinto zokulahlekelwa okuncane zihlala ziyisinqumo sobuchwepheshe esingcono naphezu kwezindleko eziphakeme.

Ukuthengwa Nokuqinisekiswa Kwekhwalithi

Ukuqinisekiswa Kwekhwalithi Okungenayo

Cela Isitifiketi Sokuhambisana (i-CoC) esinokulandeleka kwenqwaba yokuthunyelwa ngakunye kwezinto. Qinisekisa isimo sesitifiketi se-UL bese uqinisekisa imibhalo yokuhambisana ne-RoHS/REACH. Ngezicelo ezibalulekile, cela imibiko yokuhlola evela eceleni eqinisekisa izakhiwo ze-Tg, Td, kanye ne-dielectric ngokuqhathanisa nemininingwane yeshidi ledatha.

Iphrothokholi Yokuhlola Isampula

Ngaphambi kokuzibophezela ekukhiqizeni, thola amasampula ezinto zokuhlola i-impedance kuma-stackup amele. Yenza ukuhlolwa kokujikeleza kokushisa ezimotweni zokuhlola ezihlanganisiwe ukuze uqinisekise ngokuthembeka. Yenza ukuhlolwa kwe-X-ray kumajoyinti e-solder e-BGA ukuze uhlole amazinga okuphuma ngenhlanganisela ethile ye-flux kanye ne-paste ehlelelwe ukukhiqizwa.

Ngincoma ukucela amadokhumenti okuhlolwa kwemboni noma amavidiyo okwazi ukukhiqiza kubahlinzeki, ikakhulukazi kubambiswano bokuqala. Lesi sinyathelo sokuqinisekisa sisiza ukuhlonza izingozi ezingaba khona zekhwalithi ngaphambi kokuzibophezela ekukhiqizeni ngobuningi.

Isiphetho kanye nesiqondiso sokukhetha

Izinto ze-PCB ze-TU-768 zisebenza kahle ku-laminate spectrum, ziletha ukusebenza kokushisa okuphezulu kwe-Tg kanye nezici zikagesi ezamukelekayo zokusetshenziswa kwemvamisa ephakathi. Inhlanganisela yayo yokuhambisana kokuhlanganiswa okungenalo i-lead, ukunwetshwa kwe-Z-axis ephansi, kanye nokunamathela okuqinile kwethusi kwenza ifaneleke kahle izinhlelo zokusebenza zezimboni, zezimoto, nezeseva ezinezingqimba eziningi.

Ngikholwa ukuthi i-TU-768 imele ukukhetha okufanele lapho iphrojekthi yakho idinga ukusebenza okuthembekile kokujikeleza kokushisa kanye nokuhambisana kokuphinda kuphume ngaphandle kwe-lead ngaphandle kwezindleko eziphezulu zezinto ezikhethekile ezilahlekelwa kancane. Uma umklamo wakho usebenza kakhulu ngaphezu kwe-5 GHz noma udinga ukulahlekelwa okuphansi kakhulu kokufakwa, ngincoma ukuthi uhlole ezinye izindlela ze-Megtron noma ze-laminate ezikhethekile ezilahlekelwa kancane naphezu kwezindleko zazo eziphezulu zezinto.

Ukuze amaphrojekthi alinganise izidingo zokusebenza ngokumelene nemikhawulo yesabelomali, i-TU-768 ihlinzeka njalo ngemiphumela ebikezelwayo kuzo zonke izinqubo zokukhiqiza ze-PCB ezijwayelekile.

imibuzo ejwayelekile ukubuzwa

Ingabe izinto ze-TU-768 PCB zilungele ukusetshenziswa kwemvamisa ephezulu?
I-TU-768 isekela izinhlelo zokusebenza ezifika ku-2–3 GHz ngokusebenza okwamukelekayo. Ngemvamisa engaphezu kwe-5 GHz noma imiklamo edinga i-Df ngaphansi kwe-0.010, cabanga ngama-laminate akhethekile anokulahlekelwa okuncane.

Lingakanani izinga lokushisa eliphezulu lokuphinda ligeleze le-TU-768?
I-TU-768 imelana namazinga okushisa aphezulu okubuyela emuva kuze kufike ku-260°C ngamaphrofayili ajwayelekile angenalo i-lead. Kumabhodi aqinile (>2.0mm), yandisa isikhathi sokushisa kusengaphambili ukuqinisekisa ukushisa okufanayo.

Ingabe i-TU-768 ingasekela i-microstrip kanye nokulawulwa kwe-stripline impedance?
Yebo. Njengoba inamanani azinzile e-Dk angu-4.3–4.4 kuyo yonke imvamisa, i-TU-768 isekela kokubili ukucushwa kwe-microstrip kanye ne-stripline. Cacisa ukubekezelelana kwe-Dk okungu-±0.05 kwezingqimba ze-impedance ezibalulekile.

Izindleko ze-TU-768 ziqhathaniswa kanjani ne-FR-4 ejwayelekile?
I-TU-768 ivame ukubiza ngaphezu kuka-15-25% kune-FR-4 ejwayelekile, kuye ngokuthi ubukhulu bayo bunjani kanye nomthamo wayo. Le phrimiyamu ifanelekile ezinhlelweni zokusebenza ezidinga ukuhambisana okungenalo i-lead noma ukuthembeka okuthuthukisiwe kokushisa.

Ingabe i-TU-768 inezitifiketi ze-RoHS kanye ne-UL?
Yebo. I-TU-768 ihambisana nezidingo ze-RoHS futhi inesitifiketi sokusha kwe-UL 94 V-0. Cela imibhalo ethile yesitifiketi kumhlinzeki wakho ukuze uthole amarekhodi okuthobela imithetho.

Yiziphi izisindo zethusi ezitholakala ngama-laminate e-TU-768?
I-TU-768 iyatholakala ngesisindo esijwayelekile sethusi kusukela ku-0.5 oz kuya ku-2 oz. Ithusi elisindayo (3 oz+) lingadinga uku-oda okukhethekile ngezikhathi ezengeziwe zokuhola.

Ngingawathola kanjani amasampula e-TU-768 noma amashidi edatha aphelele?
Xhumana ne-Highleap Electronics ngqo ukuthola amasampula ezinto ezibonakalayo, amashidi edatha anemininingwane, kanye nokusekelwa kobunjiniyela. Sinikeza izincomo zamahhala ze-stackup ngokusekelwe ezidingweni zakho ezithile zohlelo lokusebenza.

Ingabe i-TU-768 ifanelekile ukusetshenziswa kwezimoto?
Yebo. I-TU-768 ine-Tg ephezulu, ukumuncwa komswakama okuphansi, kanye nokumelana ne-CAF kwenza kube yinto efanele kuma-elekthronikhi ezimoto asebenza ezindaweni ezishisayo nezinomswakama ezidinga kakhulu.