I-HDI PCB Guidelines for Server Motherboards

I-HDI Imibandela Yokutholwa Yamabhodi Omama Weseva

Yakha Amabhodi Omama Eseva: Izibonelo ze-HDI stackup , imithetho ye-microvia/VIPPO, izinto zokwakha, ukusayinwa kwe-impedance, kanye namathiphu e-DFM okunciphisa izindleko nesikhathi sokuhola. Amabhodi esisekelo seseva kanye namabhodi okusheshisa e-AI acindezela ubuningi, i-bandwidth, kanye namandla ngaphezu kwemiklamo ejwayelekile. I-HDI ifanelekile uma:

• Amaphakheji aphelele lawula (amasokhethi e-CPU, ama-chipset, i-BMC, ama-retimers; ama-BGA angu-≤ 0.5 mm, ehle aze afike ku-0.3–0.4 mm nge-VIPPO).
• Izindwangu zejubane eliphezulu (I-PCIe Gen5/6, i-CXL, i-NVLink/PCIe retimers) idinga ukuguqulwa okufushane okuqondile kanye nama-stubs amancane.
• I-Memory topology (I-DDR5 RDIMM/LRDIMM, i-HBM mezzanines/amamojula) idinga ukuvinjelwa okulawulwa ngokuqinile kanye ne-skew.
• I/O ngibalekela ingcindezi eduze kwezinyathelo ze-CPU/GPU zingaqhuma isibalo sesendlalelo noma ziphoqelele ukubhola emuva okusindayo.
• Izithiyo zemishini (I-EEB/CEB/uhlaka lwekhadi leseva, okokugcina, osinki bokushisa, iziqinisi) khawula iziteshi zomzila.

Kusukela ku-HDI Imibandela Yokutholwa Kuya Ezinqumweni Zesitaki Zamabhodi Omama Weseva

Uchazile ukuthi kungani i-HDI idingeka. Lesi sigaba sishintsha lezo zindlela zokunquma zibe indlela yokumisa isitaki ukuze ukuminyana komzila, i-SI/PI, ukwethembeka, nokuqondanisa komhlangano.

Okokufaka kwedizayini → Abakushayelayo kusitaki

• I-BGA pitch & I/O density → Ukuhleleka kwe-HDI (i-µngezendlalelo zangaphandle kuqala), isu elinyakazayo uma liqhathaniswa. nesiteki, ububanzi be-VIPPO, okuqondiwe kwendandatho yonyaka, nokubala komjikelezo wokulambisa.
• Izindwangu zejubane eliphezulu (PCIe Gen5/6, CXL, retimers) → ungqimba lwangaphandle µngoguquko ukuze kuncishiswe ama-stubs, ukukhetha kwesigaba sokulahlekelwa kwe-dielectric, eduze kwendiza eqinile, nanoma yiziphi izinsalela ezilawulwayo zokubhola emuva.
• I-Memory topology (DDR5 RDIMM/LRDIMM, amamojula we-HBM) → ukukhetha kwengilazi yokusabalalisa, izinketho zesinyathelo se-dielectric, isilawuli se-skew, namasu wekhuphoni nge-topology.
• Amandla nama-thermal → indawo yesisindo se-copper, ngamapulazi/i-thermal-nge-array, ikhopha elinganayo ukuze iqukathe i-warp yamaphaneli, okuqondiwe komnsalo/okusonta.
• Imvilophu yomshini (EEB/CEB, heatsink, stiffener) → ukutholakala kweshaneli ewumzila, ukuhlelwa kwesabelomali kwesendlalelo, okuqhutshwa ngaphandle ngokuhlela.
• Ukuhlanganisa nokuhlola → I-VIPPO planarity, imithetho ye-stencil ye-01005/0.3 mm pitch, amawindi e-X-ray, i-ICT/ukufinyelela kokuskena komngcele.

Ukugeleza kokukhetha okusebenzayo

1. Lungisa izindawo ze-BGA namaphethini okuphunyuka eduze kwezinyathelo ze-CPU/GPU/ASIC.
2. Khetha i-HDI ephansi kakhulu ephunyuka ngokuhlanzekile usebenzisa i-µvias egxilile lapho kunokwenzeka khona.
3. Khiya umndeni owodwa we-dielectric iphaneli ngayinye kanye nezinhloso zakho ze-impedance; xazulula emuva ububanzi/izikhala ngemvume yokucwenga yangaphandle.
4. Balance ithusi futhi uqinisekise imijikelezo lamination; engeza ama-µayisitaki kuphela lapho umzila ufakazela ukuthi iyadingeka.
5. Chaza imininingwane ye-VIPPO yokugcwalisa/i-planarity; beka amakhuphoni e-impedance kanye nezifunda zesampula ze-X-ray.
6. Qalisa i-FA nge-impedance + izigaba ezincane; yenza ama-tweaks amancane e-dielectric, bese umisa isitaki sokukhiqiza ngobuningi.

Imiphumela ejwayelekile yamabhodi Omama Weseva

• I-baseboard ye-rack eyinhloko: i-oda le-HDI eliphansi kuya kwamaphakathi; ungqimba lwangaphandle µvias, izakhiwo ezigqitshiwe ezinomkhawulo; imijikelezo ye-lam encane. Le miklamo ivame ukwakha isisekelo iseva motherboard PCB umhlangano amaphrojekthi.
• I-GPU eminyene/isithwali se-accelerator: I-VIPPO ngaphansi kwe-BGA ye-fine-pitch, i-vias ekhethiwe engcwatshwe; i-HDI emaphakathi nebhalansi yethusi ecophelelayo. Izakhiwo ezinjalo ziya ngokuya zihambisana AI motherboards, lapho izindwangu zejubane eliphezulu kanye nemizila eqinile ibusa.
• Amabhodi we-OAM/SXM-class: ukuminyana kwe-I/O okwedlulele; ukuhleleka okuphezulu kwe-HDI, i-planarity eqinile nezilawuli zenqubo, ukuzwela kwezindleko okungaqondile. Lezi zilungiselelo ezisezingeni eliphezulu zihambisana Ukukhiqizwa kwe-AI yekhompuyutha ye-PCB izidingo.

I-HDI DFM Guidelines for Server Motherboards: Kusukela kuzibonelo kuye ekukhiqizeni

Uma ucabanga ngezibonelo ze-HDI PCB Stackup ze-Server Motherboards , isinyathelo esilandelayo ukuguqula lezo zithombe zibe yi-stack engakhiwa ehlangabezana nezindleko, inzuzo, kanye nezinhloso zesikhathi sokuhola. Sebenzisa imithetho elandelayo ye-DFM ukuze uhlale ngaphakathi kwefasitela lokukhiqiza elizinzile.

Umzila Nosayizi Besici

• Ukulandelela/isikhala (ngaphandle/ngaphakathi): I-75/75 µm ijwayelekile. Uma uqondise u-60/60 µm, qinisekisa ukujiya kwethusi kanye ne-impedance ukuze amamajini okuplating angasusi i-SI.
• I-Laser microvia: 75–100 µm ububanzi, ukubukeka kwesilinganiselo ≤ 1:1, iringi ye-annular ≥ 50–60 µm yokuthembeka nokuvunwa kwe-plating.
• I-Stagged vs. Uncamela ediyazela i-microvia; uma ukunqwabelanisa kungenakugwenywa, khawula kokuthi ≤ amapheya ayisitakiki angu-2 ohlangothini ngalunye.
• Ingxube eyimpumputhe/engcwatshiwe: Nciphisa i-lamination count; isakhiwo esingu-1+N+1 sivamise ukudlula u-2+N+2 kumabhodi omama weseva ngezindleko nohlelo.
• I-drill-to-copper (izendlalelo zangaphakathi): ≥ 200 µm ukunciphisa ingcuphe ye-CAF nokuzwela kokuzulazula.

I-VIPPO, i-Solder Mask, ne-Panelization

• I-VIPPO (nge-in-pad, ifakwe ngaphezulu): Cacisa Uhlobo VII lwe-IPC-4761, gcwalisa impahla, ubuncane bokugcwalisa u-%, kanye nogqinsi lwepuleti. Chaza i-planarity target ngaphambili.
• Imaski ye-BGA ye-Fine-pitch: Ukuze ubalekele okungezona eze-VIPPO, gcina idamu lemaski ≥ 80–100 µm ukuze uvimbele ukuxhunywa kwe-solder.
• Ibhalansi yethusi: Gcina ukulinganisa futhi wengeze ukweba lapho okutholakala khona > 60% ukuze ulawule ikhasi le-warpage kumabhodi amakhulu.
• Iphaneli: Sebenzisa 18″×24″ noma 21″×24″ futhi ugcine umndeni we-resin eyodwa iphaneli ngayinye ukuze uzinzise i-impedance kanye nesivuno.

Izindleko Eziyinhloko kanye Nezinyathelo Zesikhathi Esiholayo

• Lamination cycles: umshayeli omkhulu—khetha i-oda eliphansi le-HDI elibalekela ngokuhlanzekile ama-BGA akho.
• Ukubala kwe-Microvia nokuphakama kwesitaki: umusa uyagxamalaza ukuze uvikele isivuno se-plating kanye nesikhathi somjikelezo.
• Amasistimu wezinto ezibonakalayo: umndeni owodwa we-resin iphaneli ngayinye wehlisa ukuhlukahluka futhi wenze ukufaneleka kube lula.
• Ekupheleni kwendawo: I-ENIG / ENEPIG / OSP—khetha ukugeleza komhlangano nokubala kokugeleza kabusha.
• Ukubekezelela: i-impedance eqinile, ukujiya, kanye ne-warp specs kwandisa isikhathi senqubo nezindleko—zibambe lapho zibalulekile kuphela.

I-Highleap Electronics Iwasiza Kanjani Amaqembu Ebhodi Lomama Weseva

• I-Stackup co-design: humusha isitaki sakho sesibonelo sibe esakhiweni esingenziwa ngezinto eziqinisekisiwe, izinyathelo ze-dielectric, nezibonelelo zokucwenga.
• Ukuphuma kwe-impedance: hlinzeka ngokuklama kwekhuphoni namabhande okwamukela; sebenzisa i-FA nge-impedance kanye nezigaba ezincane ngaphambi kokukhiqiza ngobuningi.
• I-VIPPO nangekhwalithi: chaza ukucaciswa kokugcwalisa/i-planarity, isampula ye-X-ray, kanye nemibandela eyize ukuze kuvikelwe isivuno se-BGA.
• I-DFM esekelwe engcupheni: letha uhlu olusezingeni (i-SI/PI, i-warpage, i-drill-to-copper, isu lephaneli) elinokuncishiswa okusebenzayo.
• Izinketho zokwakha: i-prototype, umshayeli wendiza, kanye nevolumu ye-HDI PCB + i-turnkey PCBA yamabhodi omama weseva namakhadi ahlobene (OCP NIC, PCIe risers, NVMe backplanes).

Ukulungele ukubuyekeza umklamo wakho? Yabelana ngezithiyo zakho eziqondiwe, izintandokazi zezinto ezibonakalayo, kanye nedatha yokukhiqiza (Gerber/ODB++/IPC-2581). Sizobuyisela isiphakamiso se-stackup, amanothi e-DFM, kanye nokususa izivumelwano—unjiniyela kuqala, ukulungele ukukhiqiza.

Ukukhethwa Kwezinto Ezibalulekile kanye Nokulawulwa Kokuphazamiseka Kwe-Server Motherboard HDI PCBs

Khetha amasistimu e-dielectric ngenani ledatha eliqondiwe kanye nephrofayela eshisayo, bese ukhiya ukuvinjelwa ngamakhuphoni ngaphambi kwama-athikili okuqala.

Isu Lokubalulekile

• Amanani wedatha: I-10–28 Gbps NRZ ingalingana nokulahlekelwa okuphansi kwe-FR-4+; ≥ 28 Gbps noma i-PAM4 ngokuvamile idinga amasistimu e-resin aphakathi/aphansi.
• Ingilazi kanye ne-resin: Imodeli kaDkt/Df, isitayela sengilazi, okuqukethwe kwe-resin, nobulukhuni bethusi; cabanga ukusabalalisa ingilazi noma umzila-on-bias ukuze unciphise i-skew eyenziwe nge-weave ku-DDR5.
• Ukuqina kwe-thermal: Sebenzisa i-high-Tg (≥ 170 °C), ama-dielectrics e-CTE ephansi ukuze ugeleze kaningi kanye nokushaqeka okushisayo okuvamile ekuhlanganiseni kwebhodi lomama leseva.
• Ukuhambisana nokuthembeka: Uma i-halogen-free, i-tin-whisker, noma imikhawulo ye-CAF idingeka, izindlela zokuhlola zezwe kanye namathreshold kuma-specs.

Ukugeleza Kokuvinjelwa Kokungena Kokuvinjelwa

1. Nikeza ngethebula le-impedance eliqondiwe (isb, 50 Ω SE / 100 Ω Diff, ±10%) elihloselwe i-topology yendiza eyinkomba isendlalelo ngasinye.
2. Thola izitaki zekhandidethi ezinobubanzi/izikhala ezixazululwe emuva kanye nezibonelelo zokucwenga zangaphandle.
3. Hlanganisa ngokuhlanganyela ukujiya kwethusi okuqediwe, ukubekezelelana kwe-dielectric, ukwakheka/ukubekwa kwekhuphoni, namabhendi okwamukela.
4. Qalisa i-impedance ye-athikili yokuqala kanye nesigaba esincane; yenza ukulungisa okuncane uma kudingeka, bese uvala isitaki sokukhiqiza ngobuningi.

Amanothi Alungele Ukukopisha Amabhodi Omama Weseva

Ukuphazamiseka okulawulwayo: 50 Ω SE / 100 Ω Diff (±10%). Sebenzisa isitaki esiqinisekiswe umhlinzeki kanye namakhuphoni ajwayelekile; ububanzi bongqimba lwangaphandle buhlanganisa imvume yokucwenga.
Material: Umndeni owodwa olahlekelwe kancane kuwo wonke ama-dielectric; isitayela sengilazi esingaguquki nokuqukethwe kwe-resin ukugcina u-Dk/Df uzinzile. Ukuxubana kwemindeni akuvunyelwe.

I-Microvias, i-VIPPO, kanye ne-Assembly Co-Design yamabhodi Omama Weseva

Ukuthembeka kumabhodi omama weseva kuncike ekumisweni, ukugcwalisa/ukuhleleka, kanye nephrofayili yokugeleza kabusha—waphathe njengeluphu eyodwa evaliwe.

Ngekhwalithi ne-Planarity

• Ngekhwalithi yokugcwalisa: Chaza uhlobo lokugcwalisa, ubuncane bokugcwalisa u-%, kanye ne-planarization/over-plate (isb, ≥ 20 µm) kumanothi endwangu.
• I-VIPPO planarity: Ishayela i-BGA yokumanzisa nokuvala; faka amasampula e-X-ray kanye nokuhlolwa okuyize ku-FA (okuhlosiwe <10–15%).
• Izindlela zokwehluleka ezaziwayo: Ukuqhekeka kwamadolo e-Microvia, ukuwohloka kwe-resin, nokufuduka kwe-electro ekushintsheni; qinisekisa ngokugeleza kabusha okuningi (isb, 6× @ 260 °C) kanye ne-IST/ukushaqeka okushisayo njengoba kudingeka.

Uhlu Lokuhlola Ukusebenzisana Komhlangano

• Geza kabusha iphrofayela: Qondanisa ne-Tg/CTE ne-VIPPO chemistry; gwema izinga lokushisa eliphakeme ngokweqile/i-TAL ekhulisa ingcindezi ye-metal-resin.
• I-BGA iyabaleka: Khetha i-VIPPO; uma kungenjalo phatha amadamu/amafasitela e-solder-mask ukuvimbela ukucwiliswa endaweni ecolekile.
• Ukulawula i-Warp: Isitaki se-Symmetric, ibhalansi yethusi, kanye namathuluzi/ukusekelwa okufanele; setha i-warp specs yephaneli (isb, ≤ 0.7%).
• Ukulungela isici esihle: Ku-01005 noma 0.3 mm-pitch BGAs, xhumanisa ama-stencil apertures, ukubekezelelana, nanoma yikuphi ukwehla/ukwenyuka kwasendaweni.
• Ekupheleni kwendawo: I-ENIG yephimbo elihle elijwayelekile; I-ENEPIG yokuhlanganisa i-soldering/wire-bond; I-OSP iyonga kodwa izwela ukubalwa kabusha; I-ImmAg/ImmSn idinga isitoreji nezilawuli zesulphur/tin-whisker.

Uhlu Lokuhlola Iphakheji ye-Motherboard RFQ yeseva

• I-Gerber / ODB++ / IPC-2581 (khetha i-ODB++ noma i-IPC-2581)
• Ithebula lesitaki (umkhiqizo/imodeli, ubukhulu be-dielectric, izinsimbi zethusi)
• Okuhlosiwe kwe-impedance kanye nezidingo zekhuphoni
• Ishadi lokubhoboza (i-laser/imishini, i-VIPPO, i-back-drill, ingcwatshwe)
• Qeda, imaski ye-solder/inganekwane, isilinganiso sokuvutha
• Imithetho yokuhlanganisa kanye ne-depanel (V-cut/tab-route), ukubekezelela kohlaka okubalulekile
• Ku-PCBA: I-BOM, i-centroid (XYRS), isiqondiso se-stencil, iphrofayela yokugeleza kabusha okuqondisiwe

Ukulungele ukwakha? Yabelana nge-target stackup yakho, imigomo ye-impedance, kanye nedatha yokukhiqiza. I-Highleap Electronics izobuyisa isiphakamiso esingakhiqizwa, uhlu lwezingozi ze-DFM/SI/PI olubekwe ezingeni, kanye nezinketho ezicacile zokuqeda, imijikelezo ye-lamination, kanye nezinto zokwakha—unjiniyela kuqala, ukulungele ukukhiqiza.

Esikwenzela Amabhodi Omama Weseva

1) I-Architecture & Stackup Co-Design

• Izitaki ze-HDI ukusuka ku-oda loku-1 kuye kwelesi-8 zifaniswa nephimbo le-BGA, ukuminyana komzila, nesabelomali.
• Ukuhlelwa kokuphazamiseka kwe-PCIe Gen5/6, i-CXL, i-DDR5, namaketanga e-retimer, okuhlanganisa isu lendiza nokuqhubeka kwendlela yokubuya.
• Idizayini yekhuphoni nokubekwa kokusayinwa kwe-controlled-impedance; isiqondiso sokunciphisa ingilazi-weave kanye nebhalansi yethusi.
• Ukuhlaziya i-Back-drill vs. HDI trade-off ukuze kuncishiswe ama-stubs kanye nemijikelezo yokucwiliswa.

2) Ukubuyekezwa kwe-DFM ngerejista yengozi esezingeni

• Ulayini/isikhala, i-microvia aspect ratio, isu elistakiwe uma liqhathaniswa namasu amile, izimfuneko ze-VIPPO, i-drill-to-copper, nemithetho yemaski eduze nama-BGA anephimbo elihle.
• Uhlu olunezinga lobunzima (umthelela, imbangela, lungisa) ukuze ithimba lakho lesakhiwo lazi kahle ukuthi yini okufanele lishintshe nokuthi kungani—ngaphambi kwama-prototypes.

3) I-Material & Qeda Isu

• Ukukhethwa kukho konke ukulahlekelwa okuphansi kuya kumasistimu e-resin alahleka kakhulu ngokususelwe esilinganisweni sedatha, iphrofayela eshisayo, nobungozi bokunikezwa.
• Umndeni we-resin eyodwa iphaneli ngayinye lapho kungenzeka khona ukuzinzisa i-impedance kanye nesivuno.
• Qedela ukuhwebelana (ENIG / ENEPIG / OSP / ImmAg / ImmSn) eziqondaniswe nokugeleza komhlangano nokubalwa kokugeleza kabusha.

4) I-NPI, i-FA, kanye ne-Pilot Builds

• Izihloko zokuqala ezinezilinganiso ze-impedance kanye nezigaba ezincane; Isampula ye-X-ray ye-VIPPO nezifunda ze-BGA ze-fine-pitch.
• Izinketho ze-DOE ze-via-fill/planarity, isilawuli se-warpage, namapharamitha we-stencil/reflow ku-01005 / 0.3 mm pitch.
• Ukuhlola ukwethembeka kuhlanganiswe njengoba kudingeka (isb, ukuhamba ngebhayisikili okushisayo, i-IST) okunemibandela yokwamukela ecacile.

5) I-Turnkey PCBA Yezinhlelo Zeseva

• Idizayini yestencil (izimbobo, izitebhisi/ukwehla), iphrofayela yokugeleza kabusha ifaniswe ne-Tg/CTE kanye nekhemistri ye-VIPPO.
• I-SPI, i-AOI, i-X-ray, i-flying-probe/ICT lapho kufanele khona; Ukuhlanganiswa kochungechunge lwe-boundary-scan/JTAG kanye nokusebenzisana okuyisisekelo kokusebenza kwamahanisi.
• Amandla okusebenza kabusha kuma-BGA anephimbo elihle nama-CPU/ASIC amakhulu; uchungechunge/ukulandelela kanye nemibhalo enezinga elikhulu.

6) Amabhodi Ahlobene Ohlelweni Olufanayo

• Izindiza ezingemuva (i-NVMe/SAS/SATA), amakhadi e-PCIe risers/retimer, amakhadi e-OCP NIC/mezz, amabhodi okusabalalisa amandla, isilawuli sabalandeli namabhodi okuphatha, ama-I/O PCBs wephaneli yangaphambili. Lezi zivame ukuba yingxenye yezinkudlwana iseva PCB yokukhiqiza izinhlelo.
• Lapho kungenzeka khona, hlanganisa izitaki/imindeni yezinto ezibonakalayo kuwo wonke lawa mabhodi ukwenza lula ukulawulwa kokuvimba, amakhuphoni, ukuthola, kanye nokufaneleka.

7) I-Supply Chain & Lifecycle Support

• Ukuba nokwenzeka kwe-BOM nokushintshana, ukuqondanisa kwe-AVL, izingcingo zengozi ye-LTB/EOL, neziphakamiso zomthombo wesibili.
• Amaphekhi amadokhumenti ezinga leningi (idatha ebalulekile, imiphumela yokuhlolwa, abahambi) nokusekelwa kwe-FA kwanoma yiziphi izimbuyiselo zenkambu.

I-8) Yakha Ezimweni Zakho Zokwamukela

• Senza ngokwamazinga ashiwo yikhasimende kanye nemibandela yokwamukela (isb, IPC-A-600/610 Ikilasi 2/3 uma kucacisiwe), ngedatha yokulinganisa enamathiselwe kuma-athikili okuqala. Kuzinhlelo zokusebenza eziqhutshwa ukusebenza, le ndlela ihambisana kakhulu nayo ukukhiqizwa kwe-PCB yekhompyutha esebenza kahle kakhulu futhi Ukukhiqiza i-GPB PCB.