Tuhinga o mua Poari PCB

1. Bare copper plate

Ko nga painga me nga ngoikoretanga e kitea ana:

Nga painga: he iti te utu, he papa maeneene, he pai te pumau (i te kore o te waikura).

Disadvantages: easy to be affected by acid and humidity, can not be kept for a long time, need to be used up within 2 hours after unpacking, because copper is easily oxidized when exposed to air; Kaore e taea te whakamahi i runga i nga papa taarua na te mea ka whakaitihia te taha tuarua i muri i nga hononga maitai tuatahi. If there are test points, solder paste must be printed to prevent oxidation, otherwise subsequent contact with the probe will not be good.

He waikura ano te parahi parakore mena ka puhia ki te hau, ana me whakakikorua te whakamarumaru o runga. And some people think that gold is copper, which is not true, because that’s the protective layer over the copper. Na me hiahia koe ki te rahi o te whakakikorua koura i runga i te papa ara iahiko, ara, i maarama ahau ki a koe ki te mahinga koura.

Rua, pereti koura

Ko te koura te koura pono. Ahakoa ko te paninga angiangi ka tata ki te 10% o te utu mo te kaunihera. I Shenzhen, he maha nga kaihokohoko e whai kiko ana ki te rironga mai o nga papa hiko araiti, ma etahi huarahi ki te horoi i te koura, he moni pai. Ko te whakamahinga o te koura hei paninga, ko tetahi hei awhina i nga maitai, ko tetahi hei aarai i te waikura. Ahakoa i mahia e raatau

Ko nga maihao koura o nga tau e hia nei nga tau e mau tonu ana nga mahara he rite tonu ki a ratau i te wa e hangaia ana he parahi, he konumohe, he rino hoki, kua waikura nei ki nga puranga paraurehe.

Ko te papa koura whakakikorua e whakamahia whanui ana i nga waahanga o te papa poari ara iahiko, maihao koura, mokowhiti hono me etahi atu tuunga. Mena ka kite koe he hiriwa te poari taiawhio, kaua e kii, waea atu ki te raina hotika mo nga kaihoko, ina ra ko te kaihanga hanga-hanga, kaore i tino whakamahi rauemi, me etahi atu konganu he tinihanga i nga kaihoko. Ka whakamahia e maatau te papa poari ara hiko ara waea waea ko te nuinga o te pereti koura, te pereti koura totika, te raina rorohiko, te oro me te poari hiko iti iti ehara i te pereti koura.

Ko nga painga me nga huakore o te totohu koura ehara i te mea uaua ki te haere mai:

Painga: kaore i te ngawari ki te waikura, ka taea te penapena mo te wa roa, he maeneene te mata, he pai mo te whakairi i nga titi iti me nga waahanga me nga hononga reanga iti. Poari PCB e manakohia ana me te matua (hei tauira, poari waea pukoro). Ka taea te whakahou i te reanga rewa i nga wa maha kaore he mate nui o te reera. Ka taea te whakamahi hei papanga turanga mo te kaapene COB (Chip On Board).

Ngoikoretanga: he nui te utu, he ngoikore te kaha o te hono, na te whakamahi i te raima nikara, he ngawari ki te raru o te pereti pango. Ko te paparanga nickel e whakaheke ana i te waa, a ko te pono mo te wa roa te take.

Katahi tatou ka mohio he koura te koura, he hiriwa te hiriwa? Kaore ra. Tin.

E toru, rehu poari ara iahiko

Ko nga pereti hiriwa e kiia nei he pereti tinjet. Spraying a layer of tin over the copper wire can also aid in welding. But it doesn’t offer the same long-term contact reliability as gold. There is no impact on soldered components, but reliability is not sufficient for pads exposed to air for a long time, such as ground pads, spring pin sockets, etc. Te whakamahi mo te wa-roa i te waikura whakangoikore ngawari, na te mea kaore i pai te whakapiri atu. Ko te tikanga ka whakamahia hei papa hiko ara iahiko iti, kaore he awangawanga he poari tinjet, he iti te take.

Its advantages and disadvantages are summarized as follows:

Advantages: low price, good welding performance.

Ngoikoretanga: Kaore e pai mo te whakapiri i nga titi angiangi angiangi me nga waahanga iti rawa, na te ngoikore o te papa o te pereti tinjet. I te tukatuka PCB, he maama ki te whakaputa pirepire reera ka ara ai i te ara iahiko poto mo nga waahanga pai o te ware. When used in the double-sided SMT process, because the second surface has been a high temperature reflow welding, it is very easy to re-melt tin spraying and produce spherical tin beads or similar water beads dripping under the influence of gravity, resulting in more uneven surface and affecting welding problems.

I mua atu, i korero maatau mo te poari hiko ara whero iti rawa atu, te rama rama hiko a te maina maina

E wha, te poari whakahaere OSP

Kiriata awhina maitai maitai. Na te mea he rauropi, ehara i te maitai, he iti ake i te rehu-tine.

Painga: Me nga painga katoa o te kowhiri parahi kore, ka taea ano te whakakii i nga papa kua pau.

Ngoikoretanga: Ka pa ki te waikawa me te haumanu. I roto i te take o te whakaara hurihuri tuarua, ko te waa e hiahiatia ana kia oti te tuarua o te awhiawhi tuarua he koretake. Mena ka penapenahia kia neke atu i te toru marama, me maarama ano. Whakamahia i roto i nga haora 24 i muri i te whakatuwheratanga o te putea. Ko te OSP he paparanga kiriweti, no reira me taarua te tohu whakamatautau me te whakapiri rewa hei tango i te paparanga OSP taketake kia whakapiri atu ki te waahi ngira mo te whakamatautau hiko.

Ko te mahi noa o tenei kiriata koiora ko te whakarite kia kore e konatunahia te konumohe parahi o roto i mua o te maitai. Ka mimiti te kiriata i te wa e wera ana i te waa hiko. Ka taea te whakamahi i te reira ki te paiherea i nga waea parahi ki nga waahanga.

Engari kaore i te waikura-aukati. Ko te poari taiawhio OSP, ka whakaatuhia ki te hau mo te neke atu i te tekau nga ra, kaore e taea te whakakii i nga waahanga.

He maha nga papahoa papa rorohiko e whakamahi ana i te hangarau OSP. Na te mea he nui rawa te papa ara iahiko ki te utu i te whakakikorua koura.