PCB nto kho yog qhov tseem ceeb thiab lub hauv paus ntawm SMT thaj zoo.Txoj kev kho mob ntawm qhov txuas no feem ntau suav nrog cov ntsiab lus hauv qab no.Hnub no, kuv yuav qhia txog cov kev paub dhau los hauv kev tshaj lij Circuit Board pov thawj nrog koj:
(1) Tshwj tsis yog rau ENG, lub thickness ntawm cov txheej plating tsis tau qhia meej meej hauv cov qauv hauv lub tebchaws ntawm PC.Nws tsuas yog yuav tsum tau ua kom tau raws li qhov yuav tsum tau ua ntawm solderability.Cov kev cai dav dav ntawm kev lag luam yog raws li hauv qab no.
OSP: 0.15 ~ 0.5 μm, tsis tau teev los ntawm IPC.Pom zoo siv 0.3 ~ 0.4um
EING: Ni-3 ~ 5um;Au-0.05 ~ 0.20um (PC tsuas yog qhia txog qhov xav tau thinnest tam sim no)
Im-Ag: 0.05 ~ 0.20um, qhov tuab, qhov hnyav dua qhov corrosion yog (PC tsis tau teev tseg)
Im-Sn: ≥0.08um.Yog vim li cas rau thicker yog tias Sn thiab Cu yuav txuas ntxiv mus rau hauv CuSn ntawm chav tsev kub, uas cuam tshuam rau solderability.
HASL Sn63Pb37 feem ntau yog tsim los ntawm 1 thiab 25um.Nws yog ib qho nyuaj rau kev tswj cov txheej txheem kom raug.Lead-dawb feem ntau siv SnCu alloy.Vim tias qhov kub ua haujlwm siab, nws yooj yim rau kev tsim Cu3Sn nrog lub suab tsis zoo, thiab nws tsuas yog siv tam sim no.
(2) Lub wettability rau SAC387 (raws li lub sij hawm wetting nyob rau hauv txawv lub sij hawm cua sov, chav tsev: s).
0 times: im-sn (2) florida aging (1.2), osp (1.2) im-ag (3).
Zweiter PLENAR SESSION Zweiter PLENAR SESSION Im-Sn muaj qhov zoo tshaj plaws corrosion kuj, tab sis nws cov solder kuj tsis zoo!
4 x: ENG (3)-ImAg (4.3)-OSP (10)-ImSn (10).
(3) Lub wettability rau SAC305 (tom qab dhau los ntawm lub cub tawg ob zaug).
ENG (5.1)—Im-Ag (4.5)—Im-Sn (1.5)—OSP (0.3).
Qhov tseeb, cov amateurs tuaj yeem tsis meej pem nrog cov kev tshaj lij no, tab sis nws yuav tsum raug sau tseg los ntawm cov tuam txhab ntawm PCB pov thawj thiab patching.
Post lub sij hawm: May-28-2021
