Kupedzwa kwepamusoro kwePCB (Printed Circuit Board) zvinoreva rudzi rwekupfekedza kana marapirwo anoiswa kune akafumurwa maronda emhangura uye mapadhi pamusoro pebhodhi.Kupera kwepamusoro kunoshanda zvinangwa zvakati, zvinosanganisira kudzivirira iyo yakafumurwa mhangura kubva kune oxidation, inosimudzira solderability, uye nekupa nzvimbo yakati sandara yekunamatira chikamu panguva yegungano.Kupedzwa kwepamusoro kwakasiyana kunopa akasiyana mazinga ekuita, mutengo, uye kuenderana neakananga maapplication.
Goridhe-plating uye kunyudza goridhe zvinowanzoshandiswa maitiro mukugadzirwa kwemazuva ano redunhu bhodhi.Nekuwedzera kubatanidzwa kweICs uye nhamba iri kukura yemapini, iyo vertical solder spraying process inotamburira kudzikamisa madiki solder pads, zvichiunza matambudziko kumusangano weSMT.Pamusoro pezvo, hupenyu hwesherufu hwemarata akapfapfaidzwa hupfupi.Goridhe-plating kana kunyudza goridhe maitiro anopa mhinduro kune idzi nyaya.
Mupamusoro-soro tekinoroji, kunyanya kune zvidiki-zvidiki senge 0603 uye 0402, kupfava kwemasolder pads kunokanganisa zvakananga solder paste yekudhinda mhando, iyo inozokanganisa zvakanyanya kunaka kweinotevera reflow soldering.Naizvozvo, kushandiswa kweiyo yakazara-bhodhi goridhe-plating kana kunyudza goridhe kunowanzo kucherechedzwa mune yakakwira-density uye yakanyanya-diki pamusoro pegomo maitiro.
Munguva yechikamu chekugadzirwa kweyedzo, nekuda kwezvinhu zvakaita sekutenga zvinhu, mabhodhi kazhinji haatengeswe kana asvika.Panzvimbo pezvo, vangamirira kwevhiki kana kuti kunyange mwedzi vasati vashandiswa.Upenyu hwemasherufu egoridhe-akaputirwa uye kunyudza goridhe mapuranga akareba kupfuura aya emarata akapfekwa.Naizvozvo, maitiro aya anofarirwa.Mutengo wegoridhe-akaputirwa uye kunyudzwa goridhe PCB panguva yesampling nhanho inofananidzwa neiyo yelead-tin alloy board.
1. Electroless Nickel Immersion Gold (ENIG): Iyi ndiyo yakajairika PCB pamusoro pekurapa nzira.Zvinosanganisira kuisa musara weelectroless nickel sechinhu chepakati pane solder pads, ichiteverwa nedhiri regoridhe rekunyudza pamusoro penickel.ENIG inopa mabhenefiti senge yakanaka solderability, flatness, corrosion resistance, uye kuita kwakanaka kwekutengesa.Hunhu hweGoridhe zvakare hunobatsira mukudzivirira oxidation, nekudaro inowedzera kugadzikana kwekuchengetedza kwenguva refu.
2. Kupisa Kwemhepo Solder Leveling (HASL): Iyi ndiyo imwe nzira yakajairika yekurapa pamusoro.Muchirongwa cheHASL, mapedhi anotengeswa anonyikwa musimbi yakanyungudutswa uye solder yakawandisa inopeperetswa nemhepo inopisa, ichisiya yunifomu solder layer.Zvakanakira zveHASL zvinosanganisira mutengo wakaderera, kureruka kwekugadzira nekutengesa, kunyangwe kunyatsoita kwayo uye kupfava kungave kwakadzikira.
3. Electroplating Goridhe: Iyi nzira inosanganisira electroplating chidimbu chegoridhe pane solder pads.Ndarama inokunda mumagetsi conductivity uye corrosion resistance, nekudaro inovandudza soldering quality.Zvakadaro, kuisa goridhe kunowanzo kudhura zvichienzaniswa nedzimwe nzira.Inonyanya kushandiswa mune zvigunwe zvegoridhe.
4. Organic Solderability Preservatives (OSP): OSP inosanganisira kuisa organic protective layer kune solder pads kuti ivadzivirire kubva kune oxidation.OSP inopa yakanaka flatness, solderability, uye inokodzera chiedza-basa maapplication.
5. Tini Rokunyudza: Zvakangofanana negoridhe rekunyudza, tini rekunyudza rinosanganisira kupfekedza mapedhi emasolder nerata.Immersion tin inopa kuita kwakanaka kwekutengesa uye inodhura-inoshanda kana ichienzaniswa nedzimwe nzira.Nekudaro, inogona kusakunda zvakanyanya segoridhe rekunyudzwa maererano nekushomeka kwekuora uye kugadzikana kwenguva refu.
6. Nickel/Gold Plating: Iyi nzira yakafanana negoridhe rekunyudza, asi mushure me electroless nickel plating, chidimbu chemhangura chinoputirwa chichiteverwa nemetalization treatment.Iyi nzira inopa conductivity yakanaka uye corrosion resistance, inokodzera kushandiswa kwepamusoro-soro.
7. Silver Plating: Silver plating inosanganisira kupfekedza mapedhi ekutengesa nechidimbu chesirivha.Sirivha yakanaka kwazvo maererano nekufambiswa, asi inogona kuita oxidize kana yaiswa kumhepo, kazhinji ichida imwe yekuwedzera yekudzivirira.
8. Hard Gold Plating: Iyi nzira inoshandiswa kune zvibatanidza kana socket contact points inoda kugara ichiiswa uye kubviswa.Iro rakakora regoridhe rinoiswa kuti ripe kusakara uye kuita ngura.
Misiyano pakati peGoridhe-Plating uye Immersion Gold:
1. Chimiro chekristaro chakagadzirwa negoridhe-plating uye kunyudza goridhe rakasiyana.Goridhe-plating ine goridhe rakatetepa zvichienzaniswa negoridhe rakanyudzwa.Kuiswa kwegoridhe kunowanzoita yero kupfuura goridhe rekunyudzwa, izvo vatengi vanowana zvakanyanya kugutsa.
2. Kunyudzwa kwegoridhe kune zvirinani solder hunhu kana ichienzaniswa negoridhe-plating, inoderedza kukanganiswa kwekutengesa uye kunyunyuta kwevatengi.Kunyudzwa kwegoridhe mabhodhi ane zvakanyanya kudzoreka kushushikana uye akakodzera zvakanyanya kune bonding maitiro.Nekudaro, nekuda kwekunyorova kwayo, goridhe rekunyudza harina kusimba kune zvigunwe zvegoridhe.
3. Kunyudza goridhe rinongopfekedza nickel-goridhe pamapadhi ekutengesa, kwete kukanganisa kufambiswa kwechiratidzo mumhangura, nepo goridhe-plating inogona kukanganisa kutapurirana kwechiratidzo.
4. Kuiswa kwegoridhe rakaomarara kune denser crystal structure kana ichienzaniswa nekunyudzwa kwegoridhe, zvichiita kuti isanyanya kubatwa neoxidation.Ndarama yakanyudzwa ine goridhe rakatetepa, iro rinogona kubvumira nickel kupararira kunze.
5. Kunyudza goridhe kashoma kukonzeresa waya mapfupi maseketi mumhando yepamusoro-density zvichienzaniswa negoridhe-plating.
6. Kunyudzwa goridhe rine nani adhesion pakati solder kuramba uye mhangura akaturikidzana, izvo hazvikanganisi nzvimbo panguva muripo maitiro.
7. Kunyudzwa kwegoridhe kunowanzo shandiswa kune yakakwirira-inodiwa mabhodhi nekuda kwekureruka kwayo.Goridhe-plating kazhinji inodzivirira iyo post-assembly phenomenon yeblack pad.Kudzika uye hupenyu hwesherufu hwemapuranga egoridhe akanyudzwa akanaka seaya egoridhe-plating.
Kusarudza nzira yakakodzera yekurapa kwepamusoro kunoda kutarisisa zvinhu zvakaita sekushanda kwemagetsi, kusaita ngura, mutengo, uye zvinodiwa pakushandisa.Zvichienderana nemamiriro ezvinhu chaiwo, maitiro akakodzera ekurapa kwepamusoro anogona kusarudzwa kuti asangane nemaitiro ekugadzira.
Nguva yekutumira: Aug-18-2023
