Pakeji yeFlip-Chip: Magadzirirwo, Maitiro, uye Kufunga Nezveinjiniya

1. Chii chinonzi Flip-Chip Package?

Pakeji ye flip-chip itekinoroji yekubatanidza ma "die-level" apo "semiconductor die" inosungirirwa yakatarisa pasi, ine active surface yakatarisa ku substrate. Kusiyana newaya bonding, iyo inotumira masaini kubva kumucheto we "die", "flip-chip" inoshandisa ma "solder bumps" kana ma "micro bumps" akaiswa zvakananga pama "I/O pads".

Mabumps aya anoumba kubatana kwemagetsi nekwemakanika pakati pedhi ne substrate kana PCB. Iyi dhizaini yakananga yebump-to-pad inopfupisa nzira yechiratidzo uye inobvisa parasitic inductance inowanikwa muwaya dzetambo.

2. Maumbirwo Ekutanga eFlip-Chip Package

Mapedhi eSilicon Die neI/O

Iyo silicon die ine ma active circuitry ese, ane aruminiyamu kana copper I/O pads akapararira pamusoro pe active surface. Mukugadzirisa kwe flip-chip, ma pads aya haana kungogumira pa die periphery. Ma area-array pad layouts anogonesa I/O count yakakwira zvakanyanya mukati me die footprint imwe chete, zvichitsigira zvakananga density requirements dzemazuva ano dze processors neASICs.

Mabumps eSolder

Mabump eSolder, anowanzo kuve C4 (Controlled Collapse Chip Connection) kana mabump madiki, anoshanda semaconductor emagetsi uye semakanika. Bump pitch ndiyo inosarudza huwandu hweI/O hunogona kuwanikwa; mapakeji epamberi anoshanda pamapitches ari pasi pe100 µm. Kugadzira bump metallurgy kunowanzo sanganisira ma alloys asina lead akadai seSnAgCu, anosarudzwa kuti avimbike uye ateerere nharaunda.

Zvinhu Zvisina Kuzadzwa

Underfill chinhu chakagadzirwa ne epoxy chinoiswa mumukaha uri pakati pe die ne substrate mushure mekudzokororwa. Chinogoverazve thermomechanical stress munzvimbo yese ye die pane kuiisa pazvikamu zve solder. Pasina underfill, kusawirirana kweCTE pakati pe silicon ne organic substrates kunokonzera kukurumidza kutadza kushanda kwe solder pasi pe thermal cycling.

Zvisungo zvemukati nekunze

Substrate yepakeji inopa nzira yekutumira masaini, kugoverwa kwesimba, uye rutsigiro rwemakanika. Mumagadzirirwo eFCBGA, mabhora e solder ari pasi pe substrate anobatanidzwa nePCB yesystem. Zvinhu zve substrate zvakaita seBT resin kana ABF (Ajinomoto Build-up Film) zvinosarudzwa zvichienderana ne dielectric properties, layer count requirements, uye thermal performance.

3. Flip-Chip Package vs Traditional Wire Bonding

Kureba kwekubatana uye Zvipembenene zveMagetsi

Mabhandi ewaya anounza hurefu hwemamirimita emugero ane inductance uye resistance inoenderana nawo. Mabhanzi eflip-chip anoyera makumi ema micrometer pakukwirira, zvichideredza inductance yekubatanidza nehukuru hwakakura. Musiyano uyu unokanganisa zvakananga kusimba kwechiratidzo paGHz frequency uye kushanda zvakanaka kwesimba remagetsi pasi pemitoro yemagetsi yakakwira.

Kuwanda kweI/O uye Nzira yekupisa

Kubatanidza waya kunoganhurira I/O kudivi re die, zvichideredza kuyera kwe density. Flip-chip inobvumira kushandiswa kwese kwe area-array, ichitsigira zviuru zve I/O connections. Pachishandiswa tembiricha, die backside mumapakeji e flip-chip inogona kubatanidzwa zvakananga kune heat spreader, zvichipa nzira yekupisa isingadziviriri zvakanyanya iyo mapakeji ane waya asingakwanise kuenderana nayo pasina kuoma kwakawedzerwa.

Chinzvimbo muKusarudza Kurongedza

Flip-chip haisi nzvimbo inoshandiswa nevanhu vose pakubatanidza waya. Inotarisa zvinodiwa chaizvo: kuwanda kweI/O, kusimba kwemasaini, uye kupisa kwakanyanya. Kubatanidza waya kunoramba kuri nyore pakushandisa michina isina kuoma zvakanyanya uko maparameter aya asina kunyanya kukosha.

4. Maitiro ekurongedza machipisi eFlip-Chip

Kuumbwa kweMapundu

Mabumps anoumbwa padanho rewafer kuburikidza ne electroplating kana evaporation processes. Mabumps eC4 solder anoramba ari enguva dzose kune akawanda mashandisirwo, nepo mabumps eCu pillar ane solder caps achigadzirisa zvinodiwa zve pitch fine. Maitiro ekugadzira bumps anotsanangura zviyero zvakakosha zvinosarudza goho rekuunganidza uye kuvimbika kwenguva refu.

Wafer Dicing

Mushure mekubonderana, wafer inogovaniswa kuita die yega yega. Kubonderana kunofanira kuchengetedza bump integrity uye kudzivirira edge chipping izvo zvinogona kukanganisa simba redie. Kubonderana kweblade uye laser dicing zvinosarudzwa zvichienderana nehukobvu hwewafer, bump configuration, uye throughput requirements.

Kuiswa Kwekufa uye Kudzokazve

Chidiro chinotenderedzwa uye chinoiswa pamusoro pechidiro chine mabumps akabatana nemapedhi anoenderana. Panguva yekudzoreredza, kusimba kwenzvimbo yekusolder kunoita kuti ienderane, zvichitsiva zvikanganiso zvidiki zvekuisa. Mapurofayiri ekudzoreredza anofanira kuenzana nekunyorovesa kwese kwesolder kubva pakukura kwakanyanya kwepakati pesimbi.

Kuisa uye Kugadzirisa Zvisina Kuzadzwa

Kuzadza pasi pe capillary kunobudiswa pamucheto we die uye kunokweverwa muburi ne capillary action. Kuzadza kwakakwana pasina ma voids kwakakosha; ma air pockets akavharirwa anova stress concentrators uye nzvimbo dzekutanga corrosion. Thermal curating inobatanidza epoxy, zvichigadzira hunhu hwekupedzisira hwe mechanical.

Kugadzwa Kwepakeji Yekupedzisira

Pamapakeji eBGA-type flip-chip, mabhora e solder anosungirirwa pasi pe substrate odzoserwa mvura. Pakeji yapedzwa inoongororwa nemagetsi uye inoongororwa nemaziso isati yatumirwa. Kudzora maitiro padanho rega rega kunoona goho rese rekuunganidza.

5. Zvinhu Zvinokosha Mukugadzira Flip-Chip Packaging

Solder Alloys

Ma alloy asina mutobvu anosvetedza, kunyanya SnAgCu (SAC), ave mwero weindasitiri. Kuumbwa kwe alloy kunokanganisa kunyunguduka, maitiro ekunyorovesa, uye hunhu hwemakanika. Kuwanda kwesirivha kunovandudza kuramba kuneta asi kunowedzera mutengo; kusarudzwa kwe alloy kunoenzanisa zvinodiwa zvekuvimbika zvichienzaniswa nematambudziko ehupfumi.

Underfill Materials

Mafomula ekuzadza pasi akagadzirwa kuti aenderane neCTE ye solder ne substrate system. Saizi ye filler particle uye loading zvinokanganisa hunhu hwekuyerera kwemvura uye modulus yekupedzisira. Mafomula ekuzadza pasi anogona kugadziriswazve ariko anorasikirwa nekushanda kwakavimbika kana tichienzanisa nemafomula akajairwa.

Substrate uye RDL Zvinhu

Zvigadziko zve organic zvinoshandisa BT resin kana ABF build-up layers zvichienderana nehuwandu hwema layer uye zvinodiwa nehukuru hwe feature. Zvigadziko zvekugovera (RDL) pa die kana substrate fan out fine-pitch bump connections kune coarser substrate features. Kusarudzwa kwezvinhu zvinokanganisa zvakananga mashandiro emagetsi, maitiro e warpage, uye goho rekugadzira.

6. Kushanda Kwemagetsi Uye Kupisa Kwemapakeji eFlip-Chip

Mabhenefiti eKuvimbika kweChiratidzo

Kureba kwekubatanidza kwakaderedzwa kunoreva kudzikira kweinductance uye kuvandudzwa kweimpedance control. Masaini e-high-frequency haanyanyi kudzikamisa uye kufungisisa. Hunhu uhwu hunoita kuti kurongedza kwe-flip-chip kuve kwakakosha kune ma processor anoshanda pa multi-GHz clock frequency uye high-speed serial interfaces.

Kuendesa Simba uye Kupisa Kwemafuta

Mapombi akawanda emagetsi nepasi anopararira munzvimbo yese yedhie anoderedza kudonha kwemagetsi anodzivirira. Kumashure kwedhie kwakaratidzwa kunoita kuti pave nekunamirwa kwespreader yekupisa zvakananga, zvichiita kuti kudzivirira kupisa kusagoneke nekugadzirwa kwewaya. Mapurosesa ane simba guru nemaGPU anoenderana nehurongwa uhwu hwekupisa.

7. Flip-Chip Package: Matambudziko eMechanical neMagadzirirwo

Kusawirirana kweCTE uye Kuneta kweSolder

Silicon (CTE ~3 ppm/°C) uye organic substrates (CTE ~15-17 ppm/°C) dzinowedzera nematanho akasiyana panguva yekupisa. Kusawirirana uku kunokonzera kushushikana kwemajoini e solder, zvichikonzera kutanga kwekupwanyika kwemafuta nekuneta. Kuzadzwa kwakaderera kunoderedza asi hakubvisi kunetseka uku kukuru kwekuvimbika.

Kudzora Maitiro Ekuzadza Zvisina Kukwana

Kuvharwa kwepasi pevhu kusina kukwana kana kuti kuvharwa kwevhu risina chinhu kunoita kuti pave nenzvimbo dzisina kusimba dzekuvimbika. Maparamita ekupa, tembiricha yepasi pevhu, uye kusimba kwepasi pevhu zvinofanira kudzorwa zvakasimba. Mwero wekusabuda kwevhu unowedzera sezvo bump pitch ichiderera, zvichikonzera matambudziko aripo ekugadzira ma process panzvimbo dzakakura.

Kugadzirisa Kunzwa Kwemvura Uye Kubudirira

Kugadziriswa kwepakeji kunokanganisa kugona kwekugadzira uye kuvimbika kwebhodhi. Kufa kukuru pamatanda matete ndiko kunonyanya kukanganiswa. Mapundu matete anoda kunyatsorongeka kwekuisa uye kushivirirana kwe coplanarity, zvichiwedzera kukosha kwekushanda kwekugadzira chero shanduko yemaitiro.

8. Mhando Dzakajairika dzeFlip-Chip Packages

FCOB neFCCSP

Flip-Chip on Board (FCOB) inoisa die zvakananga kuPCB yesystem isina substrate yepakati, zvichideredza saizi nemutengo wemashandisirwo akakodzera. Flip-Chip Chip Scale Package (FCCSP) inoshandisa substrate diki, ichichengetedza footprint yepedyo nekufa uku ichipa mukana wekufamba netsoka.

FCBGA

Flip-Chip Ball Grid Array (FCBGA) inosanganisa flip-chip die attach neBGA substrate interface. Iyi configuration inotsigira complex multi-layer routing, integrated passives, uye high I/O counts. FCBGA ndiyo inonyanya kushandisa macomputer ane high-performance applications anosanganisira server processors uye networking ASICs.

9. Mashandisirwo Akajairika eFlip-Chip Packaging

High-Performance Computing

MaCPU, maGPU, uye maFPGA epamusoro-soro anoshandisa kurongedza kwemachipisi e-flip-chip. Kusanganiswa kwehuwandu hweI/O, kushanda kwemagetsi kwepamusoro, uye kupararira kwemafuta kunoshanda zvakanaka kunoenderana nezvinodiwa zvemidziyo iyi panguva imwe chete. Data center uye AI accelerator applications zvinosimudzira kufambira mberi kwetekinoroji ye-flip-chip.

Networking, RF, uye Mota

MaASIC eNetwork switch nemaRF power amplifiers anobatsirwa nema "low-inductance interconnects" e "flip-chip". Ma "electronics" emotokari ari kushandisa "flip-chip" kune masisitimu epamusoro ekubatsira vatyairi uko kusimba kwechiratidzo uye kutonga kwekupisa kwakakosha. Midziyo yevatengi yakadai semafoni anoshandisa FCCSP kune ma "application processors".

10. Kuvimbika uye Kuongorora Pakeji yeFlip-Chip

Common Kukundikana Modes

Kutsemuka kwebundu resolder nekuda kwekuneta kwethermomechanical kunomiririra nzira huru yekupera. Kubvisa pasi pedhiri kubva pamusoro pedie kana substrate kunoita kuti majoini esolder awedzere kushushikana. Kufamba kwema electromagnetic mumabundu ane simba guru kunogona kukonzera kutadza kushanda zvakanaka munzira dzekutumira magetsi.

Maitiro Ekuongorora

Kuongorora X-ray kunoratidza maburi maburi, kusarongeka zvakanaka, uye zvikanganiso zvekubatanidza. Kuskena acoustic microscopy (SAM) kunoona maburi asina kuzara uye kucheka. Kuyedzwa kwemagetsi kunoratidza kubatana uye kushanda kweparametric. Nzira idzi dzinoshanda pamwe chete kuongorora mayuniti asina kunaka uye kutarisa kugona kwemaitiro.

11. Mainjiniya Anofanira Kusarudza Pakeji yeFlip-Chip Rini?

Chisarudzo Chekuita

Kurongedza machipisi e-flip-chip kunofanirwa kuitwa kana huwandu hweI/O huchidarika miganhu inoshanda yekubatanidza waya, kazhinji pamusoro pe500-700 connections. Mafrequency esignal muGHz range anobatsirwa nekuderedza hutachiona hweinterconnect. Zvinodiwa zvekupisa pamusoro pe10-15W zvinotsigira nzira yekupisa yakananga inopa flip-chip.

Kufunga Nezvezvivakwa uye Mari

Kugadzira machipisi eflip-chip kunoda michina yakasarudzika yekuisa, kudzoreredza, uye kuzadzisa zvese zvinodiwa. Mari ye substrate inodarika dzimwe nzira dze leadframe. Mainjiniya anofanirwa kuongorora kana zvinodiwa pakushanda zvichitsigira mutengo wepamusoro uye kuona kuti vadyidzani vekugadzira vane hunyanzvi hunodiwa hwekuita uye masisitimu emhando yepamusoro.