Gawo 2 Njira zodziwika zodziwika bwino za zigawo za polar za SMT

6. Integrated Circuit
6.1 SOIC mtundu wa ma CD ali ndi polarity.Zizindikiro za polarity :1) riboni, 2) chizindikiro, 3) notches ndi grooves, 4) bevel
6.2 PACKAGE ya mtundu wa SOP kapena QFP ili ndi polarity.Polarity yolembedwa :1) notch/groove yolembedwa, 2) Mfundo imodzi ndi yosiyana (kukula/mawonekedwe) ndi mfundo ziwiri/zitatu.
6.3 QFN mtundu encapsulation ali polarity.Polarity anasonyeza: 1) mfundo imodzi ndi yosiyana ndi mfundo zina ziwiri (kukula / mawonekedwe), 2) hypotenuse anasonyeza, 3) chizindikiro chosonyeza (bar/” + “chizindikiro/dontho).

7. Gulu la Gulu la Mpira
7.1 Gawo la polarity: notch/groove/dont/round;Polarity wa bolodi PCB: bwalo/dontho/chilembo “1 kapena A”/bevel chizindikiro.Malo a polarity a gawolo amafanana ndi polarity point pa PCB.Njira yozindikiritsira kukana kwa SMT
Nthawi zambiri, pali mitundu 12 ya zopinga za mphete zamitundu: zofiirira, zofiira, lalanje, zachikasu, zobiriwira, zabuluu, zofiirira, imvi, zoyera, zakuda, golide ndi siliva.Mwa iwo, mitundu khumi yoyambirira imayimira 1 ~ 9 (wakuda amayimira 0), ndipo golidi ndi siliva motsatana zimayimira mitundu iwiri ya zolakwika (kuphatikiza kapena kuchotsera 5% ndi kuphatikiza kapena kuchotsera 10%).

Mitundu iwiri yoyambirira imayimira Numeri yoyera.Mwachitsanzo, lalanje ndi zakuda zimayimira nambala 30 (osanena kuti kukana ndi 30 euro), ndipo mphete yachitatu imayimira chiwerengero cha ziro.Mwachitsanzo, ngati mphete yamtundu wachitatu ndi yofiira, zikutanthauza kuti nambala 30 imatsatiridwa ndi ziro ziwiri, ndipo kukana kwa kukana uku ndi 30 00 euro (3k euros).

Mphete yamtundu womaliza ndi golide kapena siliva.Mwachitsanzo, ngati mphete yamtundu womaliza ndi siliva, kukana kwa kukana kudzakhala pakati pa 3000 ohms kuphatikiza kapena kuchotsera 10% (kukana kwenikweni kwa kukana kudzakhala mtengo uliwonse wotsimikizika mkati mwamtunduwu).

SMT capacitance polarity chiweruzo ndi chidziwitso cha mphamvu

Capacitor imagawika makamaka mu electrolytic capacitor ndi capacitor wafer capacitor.Mawonekedwe a electrolytic capacitor ndi silinda, ndipo silinda yake imakhala ndi kukula kwake kwa capacitance, ndipo ili ndi polarity (phazi lalitali ndilo mtengo wabwino, phazi lalifupi ndilopanda pake).

Kumbali inayi, capacitance ya wafer ilibe polarity.Nthawi zambiri amapangidwa ngati bwalo ndipo amalembedwa ndi Nambala zitatu, pomwe manambala oyamba ndi achiwiri amayimira kuchuluka kwa ziro ndipo nambala yachitatu imayimira ziro, monga 233, yomwe imayimira kuchuluka kwa 23000PF kapena 0.023 micromethod.

NeoDen imapereka mayankho athunthu a mzere wa SMT, kuphatikiza uvuni wa SMT reflow, makina opangira magetsi, makina osankha ndi malo, makina osindikizira a solder, uvuni wa Reflow, PCB loader, PCB unloader, chip mounter, SMT AOI makina, SMT SPI makina, SMT X- Makina a Ray, zida zolumikizirana za SMT, Zida zopangira PCB SMT zida zosinthira, ndi zina zilizonse makina a SMT omwe mungafune, chonde titumizireni kuti mumve zambiri:

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