Qhov chaw tiav ntawm PCB (Printed Circuit Board) yog hais txog hom txheej txheej lossis kev kho mob siv rau cov kab tooj liab thiab cov ntaub qhwv rau ntawm lub rooj tsavxwm.Nto tiav ua haujlwm rau ntau lub hom phiaj, suav nrog kev tiv thaiv cov tooj liab los ntawm oxidation, txhim khu kev sib txuas, thiab muab lub tiaj tiaj rau cov khoom sib txuas thaum sib dhos.Kev sib txawv ntawm qhov chaw tiav muaj ntau theem ntawm kev ua tau zoo, tus nqi, thiab kev sib raug zoo nrog cov ntawv thov tshwj xeeb.
Kub-plating thiab immersion kub yog feem ntau siv cov txheej txheem hauv kev tsim hluav taws xob niaj hnub.Nrog rau kev sib koom ua ke ntawm ICs thiab cov pins ntau zuj zus, cov txheej txheem ntsug ntawm cov tshuaj tsuag tsuag tau tawm tsam kom flatten me me solder pads, ua rau muaj teeb meem rau SMT sib dhos.Tsis tas li ntawd, lub txee lub neej ntawm sprayed tin phaj yog luv luv.Kub-plating lossis immersion kub txheej txheem muab kev daws teeb meem rau cov teeb meem no.
Hauv kev siv tshuab saum npoo av, tshwj xeeb tshaj yog rau cov khoom me me xws li 0603 thiab 0402, qhov flatness ntawm cov ntaub qhwv ncaj qha cuam tshuam rau cov luam ntawv luam ntawv zoo, uas ua rau muaj kev cuam tshuam loj rau qhov zoo ntawm cov khoom siv rov qab tom qab.Yog li ntawd, kev siv tag nrho-board kub-plating los yog immersion kub yog feem ntau pom nyob rau hauv high-density thiab ultra-me me nto mount txheej txheem.
Thaum lub sij hawm sim ntau lawm, vim muaj tej yam xws li kev yuav khoom, boards feem ntau tsis soldered tam sim ntawd thaum tuaj txog.Hloov chaw, lawv yuav tos rau lub lis piam lossis ntau lub hlis ua ntej siv.Lub neej txee ntawm kub-plated thiab immersion kub boards yog ntev npaum li cas ntawm tin-plated boards.Yog li ntawd, cov txheej txheem no nyiam dua.Tus nqi ntawm kub-plated thiab immersion kub PCBs thaum lub sij hawm sampling theem yog piv rau cov hlau lead-tin alloy boards.
1. Electroless Nickel Immersion Kub (ENIG): Qhov no yog ib qho kev kho PCB nto.Nws koom nrog kev siv ib txheej ntawm electroless npib tsib xee ua ib txheej txheej nruab nrab ntawm cov ntaub qhwv, ua raws li cov txheej txheem kub ntawm cov npib tsib xee.ENIG muaj cov txiaj ntsig zoo li kev ua kom zoo, ua kom zoo, ua kom tsis muaj zog, thiab kev ua haujlwm zoo.Cov yam ntxwv kub kuj tseem pab tiv thaiv oxidation, yog li txhim khu kev ruaj ntseg cia ntev.
2. Cua Kub Solder Leveling (HASL): Qhov no yog lwm txoj kev kho saum npoo.Nyob rau hauv cov txheej txheem HASL, cov ntaub qhwv cov ntaub qhwv tau dipped rau hauv cov molten tin alloy thiab cov khoom siv ntau dhau yog tshuab los ntawm cov cua kub, tawm hauv qab ib txheej txheej.HASL qhov zoo muaj xws li tus nqi qis, yooj yim ntawm kev tsim thiab soldering, txawm hais tias nws qhov kev txiav txim siab saum npoo thiab flatness yuav zoo dua.
3. Electroplating Kub: Txoj kev no yuav siv electroplating ib txheej kub rau hauv cov ntaub so ntswg.Kub excels nyob rau hauv hluav taws xob conductivity thiab corrosion kuj, yog li txhim kho soldering zoo.Txawm li cas los xij, kub plating feem ntau kim dua piv rau lwm txoj hauv kev.Nws yog tshwj xeeb tshaj yog siv rau hauv daim ntawv thov ntiv tes kub.
4. Organic Solderability Preservatives (OSP): OSP koom nrog kev siv cov txheej txheem tiv thaiv organic rau cov ntaub qhwv los tiv thaiv lawv los ntawm oxidation.OSP muaj kev sib tw zoo, kev sib tw, thiab tsim nyog rau kev siv lub teeb ua haujlwm.
5. Immersion Tin: Zoo ib yam li immersion kub, immersion tin muaj txheej txheej ntawm cov ntaub qhwv nrog ib txheej ntawm tin.Immersion tin muab kev ua tau zoo soldering thiab yog tus nqi zoo piv rau lwm txoj kev.Txawm li cas los xij, nws yuav tsis zoo npaum li qhov kub kub hauv cov ntsiab lus ntawm corrosion kuj thiab lub sij hawm ntev stability.
6. Nickel/Gold Plating: Txoj kev no zoo ib yam li immersion kub, tab sis tom qab electroless npib tsib xee plating, ib txheej ntawm tooj liab yog coated tom qab metalization kev kho mob.Txoj hauv kev no muab kev ua haujlwm zoo thiab kev tiv thaiv corrosion, haum rau kev ua haujlwm siab.
7. Silver Plating: Silver plating yuav tsum tau coating lub solder pads nrog ib txheej ntawm nyiaj.Nyiaj yog zoo heev nyob rau hauv cov nqe lus ntawm conductivity, tab sis nws yuav oxidize thaum raug huab cua, feem ntau yuav tsum tau ib tug ntxiv tiv thaiv txheej.
8. Hard Gold Plating: Txoj kev no yog siv rau cov connectors los yog lub qhov (socket) tiv tauj cov ntsiab lus uas yuav tsum tau nquag ntxig thiab tshem tawm.Ib txheej tuab ntawm kub yog siv los muab kev hnav tsis kam thiab kev ua haujlwm corrosion.
Qhov txawv ntawm Kub-Plating thiab Immersion Kub:
1. Cov qauv siv lead ua tsim los ntawm kub-plating thiab immersion kub yog txawv.Kub-plating muaj ib txheej kub thinner piv rau immersion kub.Kub plating nyiam daj ntau dua li kub kub, uas cov neeg siv khoom pom zoo dua.
2. Immersion kub muaj zoo soldering yam ntxwv piv rau kub-plating, txo soldering tsis xws luag thiab cov neeg tsis txaus siab.Immersion kub boards muaj ntau tswj kev ntxhov siab thiab tsim nyog rau cov txheej txheem sib txuas.Txawm li cas los xij, vim nws qhov xwm txheej softer, immersion kub tsis tshua muaj zog rau cov ntiv tes kub.
3. Immersion kub tsuas yog coats npib tsib xee-kub ntawm cov ntaub qhwv, tsis cuam tshuam cov teeb liab kis tau tus mob hauv cov txheej tooj liab, qhov kub-plating yuav cuam tshuam cov teeb liab kis tau tus mob.
4. Hard kub plating muaj ib tug denser siv lead ua qauv piv rau immersion kub, ua rau nws tsis tshua muaj oxidation.Immersion kub muaj txheej txheej kub dua, uas tuaj yeem tso cai rau nickel diffuse tawm.
5. Immersion kub tsis tshua muaj peev xwm ua rau cov xaim luv luv hauv cov qauv siv high-density piv rau kub-plating.
6. Immersion kub tau zoo adhesion ntawm solder tiv thaiv thiab tooj liab txheej, uas tsis cuam tshuam qhov sib nrug thaum lub sij hawm compensatory txheej txheem.
7. Immersion kub feem ntau yog siv rau cov boards xav tau ntau dua vim nws zoo dua flatness.Kub-plating feem ntau zam qhov tshwm sim tom qab sib dhos ntawm cov ntaub qhwv dub.Lub flatness thiab txee lub neej ntawm immersion kub boards yog zoo li cov kub-plating.
Kev xaiv txoj kev kho kom haum rau saum npoo yuav tsum xav txog yam xws li kev ua haujlwm hluav taws xob, kev tiv thaiv corrosion, nqi, thiab kev thov.Nyob ntawm cov xwm txheej tshwj xeeb, cov txheej txheem kho kom haum rau saum npoo tuaj yeem raug xaiv kom ua tau raws li cov qauv tsim.
Post lub sij hawm: Aug-18-2023
