PCB thaiv yuav cuam tshuam rau tom ntej PCB los ua ke ua. Peb yuav tsum ua tib zoo xav txog cov kab dav thiab kab sib nrug ntawm cov xaim, kev sib txuas ntawm cov xaim thiab cov khoom siv nti, cov hlau thiab SOIC, PLCC, QFP, SOT thiab lwm yam khoom siv hauv PCB tsim theem. Kev sib raug zoo ntawm kev sib txuas ntawm lub ncoo, kab dav thiab tam sim no, tsuas yog thaum cov teeb meem no tau zoo nrog, tuaj yeem ua tiav PCBA board zoo.

1. Cov kab hluav taws xob ntau

Cov kev xav tau loj ntawm cov kab hluav taws xob yog raws li qhia hauv lub rooj, suav nrog qhov loj ntawm cov txheej sab hauv thiab sab nrauv thiab cov ntawv ci tooj liab rau ntawm ntug ntawm lub rooj tsavxwm thiab cov phab ntsa uas tsis yog-metalized.

2. Txoj kab dav thiab kab sib nrug ntawm cov xaim

Nyob rau hauv cov ntaub ntawv ntawm PCBA los ua ke ua ceev tso cai, tsawg ceev thaiv tsim yuav tsum tau siv raws li ntau li ntau tau los txhim kho kho raws-dawb thiab txhim khu kev qha raug tuition. Tam sim no, lub peev xwm ua tau ntawm cov tuam txhab lag luam dav dav yog: qhov tsawg kawg kab dav yog 0.127mm (5mil), thiab qhov tsawg kawg kab sib nrug yog 0.127mm (5mil). Feem ntau siv thaiv qhov ntom ntom tsim siv siv tau pom hauv lub rooj.

3. Kev sib txuas ntawm cov hlau thiab cov ntaub qhwv ntawm cov khoom siv nti

Thaum txuas cov xov hlau thiab cov chips, hauv txoj cai, lawv tuaj yeem txuas tau ntawm txhua qhov chaw. Txawm li cas los xij, rau cov khoom siv chips uas yog welded los ntawm reflow welding, nws yog qhov zoo tshaj los tsim raws li cov hauv qab no.

ib. Rau cov khoom nruab nrog ob lub ncoo, xws li cov resistors thiab capacitors, cov ntawv luam tawm txuas nrog lawv cov ntaub qhwv yuav tsum zoo dua yog kos symmetrically los ntawm qhov nruab nrab ntawm lub ncoo, thiab cov ntawv luam tawm txuas nrog lub ncoo yuav tsum muaj qhov dav tib yam. Rau cov hlau lead uas muaj kab dav ntawm tsawg dua 0.3mm (12mil), qhov kev muab no tuaj yeem tsis lees paub.

b. Rau cov ntaub qhwv txuas nrog lub dav hlau luam tawm, nws yog qhov zoo dua kom dhau los ntawm kev hloov pauv ntawm cov xaim nqaim hauv nruab nrab. Cov ntawv nqaim no feem ntau yog hu ua “txoj kev rwb thaiv tsev”, txwv tsis pub, rau 2125 (Lus Askiv yog 0805) ) Thiab cov chip-type SMDs hauv qab no feem ntau ua rau “sawv nti” tsis xws luag thaum vuam. Cov kev cai tshwj xeeb tau qhia hauv daim duab.

4. Cov xov hlau txuas nrog cov ntaub qhwv ntawm SOIC, PLCC, QFP, SOT thiab lwm yam khoom siv

Thaum txuas lub voj voog mus rau lub ncoo ntawm SOIC, PLCC, QFP, SOT thiab lwm yam khoom siv, feem ntau pom zoo kom coj cov hlau los ntawm ob qho kawg ntawm lub ncoo, raws li qhia hauv daim duab.

5. Kev sib raug zoo ntawm kab dav thiab tam sim no

Thaum lub teeb liab nruab nrab tam sim no kuj loj, kev sib raug zoo ntawm kab dav thiab tam sim no yuav tsum tau xav txog. Rau cov kev txwv tshwj xeeb, thov saib cov lus hauv qab no. Hauv PCB tsim thiab ua tiav, oz (ounce) feem ntau yog siv los ua cov tuab tuab ntawm cov ntawv ci tooj liab. 1oz tooj liab tuab yog txhais raws li qhov hnyav ntawm cov ntawv ci tooj liab hauv thaj tsam ntawm ib square inch, uas sib haum rau lub cev tuab ntawm 35μm. Thaum cov ntawv ci tooj liab tau siv los ua cov xaim thiab cov tam sim no loj dhau lawm, kev sib raug zoo ntawm qhov dav ntawm cov ntawv ci tooj liab thiab lub peev xwm nqa tam sim no yuav tsum tau derated los ntawm 50% nrog rau cov ntaub ntawv hauv cov lus.