Momwe mungadziwire polarity ya gawo la SMT

Momwe mungadziwire polarity ya gawo la SMT

Chisamaliro chapadera chiyenera kuperekedwa ku zigawo za polarity mu ndondomeko yonse ya PCBA yokonza, chifukwa zigawo zolakwika zomwe zimapangidwira zidzatsogolera ku ngozi za batch ndi kulephera kwa lonse.Chithunzi cha PCBA.Chifukwa chake, ndikofunikira kwambiri kuti ogwira ntchito zamagetsi kapena opanga amvetsetse zigawo za SMT polarity.

1. Tanthauzo la polarity

Polarity imatanthawuza kuti zabwino ndi zoipa kapena pini yoyamba ya chigawocho, ndipo zabwino ndi zoipa kapena pini yoyamba ya PCB zili mbali imodzi.Ngati chigawocho ndi bolodi ya PCB sichikufanana, imatchedwa reverse bad.

2. Njira yozindikiritsa polarity

a.Chip resistor ali ndi nonpolarity

b.Momwe mungadziwire Capacitor polarity

• Nonpolarity ya ceramic capacitor

• Tantalum capacitors ali ndi polarity.Chizindikiro chabwino cha PCB ndi zigawo zake: 1) chizindikiro cha gulu lamtundu;2) "+" chizindikiro;3) chizindikiro cha diagonal

• Ma electrolysis ndi capacitance ya aluminiyamu ali ndi polarity.Chizindikiro cha gawo: gulu lamtundu limayimira zoyipa;Chizindikiro cha PCB: gulu lamtundu kapena "+" likuyimira zabwino.

3. Momwe mungadziwire polarity ya inductor

Ÿ Palibe polarity yofunikira pa phukusi la chip coil ndi mbali zina ziwiri zowotcherera.

Ÿ Ma pin inductors ambiri ali ndi zofunikira za polarity.Chizindikiro: dontho / “1″ imayimira polarity point;Chizindikiro cha PCB: dontho / bwalo / "*" imayimira polarity point.

4. Momwe mungadziwire kuwala kwa diode polarity

Ÿ SMT yokwera pamwamba pa LED imakhala ndi polarity.Choyipa chizindikiro cha chigawo: wobiriwira ndi zoipa;PCB yoyipa: 1) mipiringidzo yowongoka, 2) gulu lamitundu, 3) ngodya yakuthwa ya sikirini ya silika, 4) “匚” ya nsalu yotchinga ya silika.

5. Momwe mungadziwire polarity ya diode

Ÿ SMT surface mount diode ili ndi polarity.Zolemba zolakwika za chigawocho: 1) gulu lamtundu, 2) poyambira, 3) mtundu wa chizindikiro (galasi);Zolakwika pakuyika chizindikiro cha PCB: 1) mipiringidzo yowongoka poyika chizindikiro, 2) utoto mpaka polemba, 3) ngodya yakuthwa ya silika, 4) “匚” poyika chizindikiro

6. Momwe mungadziwire polarity ya IC (Integrated Circuit).

Ÿ Zopaka zamtundu wa SOIC zimakhala ndi polarity.Chizindikiro cha polarity: 1) gulu lamtundu, 2) chizindikiro, 3) malo ozungulira, groove, 4) bevel.

Ÿ Zopaka zamtundu wa SOP kapena QFP zimakhala ndi polarity.Polarity chisonyezo: 1) concave / poyambira poyikapo, 2) imodzi mwa mfundoyi ndi yosiyana ndi mfundo ziwiri kapena zitatu (kukula / mawonekedwe).

Ÿ Mapaketi amtundu wa QFN ali ndi polarity.Polarity to cholemba: 1) mfundo imodzi ndi yosiyana ndi mfundo zina ziwiri (kukula / mawonekedwe), 2) beveled m'mphepete mpaka cholemba, 3) chizindikiro mpaka cholemba (chopingasa, "+", dontho)

7. Momwe mungadziwire (BGA) Ball Grid Array polarity

chigawo polarity: concave point / groove chizindikiro / dontho / bwalo kuti mulembe;PCB polarity: bwalo / dontho / 1 kapena A / diagonal kuti mulembe.Polarity mfundo ya gawo limafanana ndi polarity mfundo pa PCB.

(Mawu a chithunzicho amachokera kumanzere kupita kumanja, ndipo kuchokera pamwamba mpaka pansi: dontho la zigawozo likufanana ndi kusindikiza kwa PCB "1", dontho la zigawozo likufanana ndi kusindikiza kwa PCB "1 ndi A", bwalo. mfundo ya zigawo zimagwirizana ndi polarity point ya PCB, bevel m'mphepete mwa zigawo zimagwirizana ndi PCB polarity point, malo ozungulira a zigawozo amafanana ndi polarity point ya PCB, polarity point imagwirizana bwino, polarity point ikugwirizana. zolakwika, ndipo mayendedwe amasinthidwa)

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