Ungayibona kanjani i-polarity yengxenye ye-SMT

Ungayibona kanjani i-polarity yengxenye ye-SMT

Ukunakwa okukhethekile kufanele kukhokhwe ezingxenyeni ze-polarity kuyo yonke inqubo yokucubungula ye-PCBA, ngoba izingxenye zokuma okungalungile zizoholela ezingozini ze-batch kanye nokwehluleka kwayo yonke.Ibhodi le-PCBA.Ngakho-ke, kubaluleke kakhulu ukuthi abasebenzi bonjiniyela noma abakhiqizayo baqonde izingxenye ze-SMT polarity.

1. Incazelo ye-polarity

I-polarity isho ukuthi iphozithivu nenegethivu noma iphinikhodi yokuqala yengxenye, futhi iphozithivu nenegethivu noma iphinikhodi yokuqala ye-PCB isendleleni efanayo.Uma isiqondiso sengxenye kanye nebhodi le-PCB kungafani, kubizwa ngokuthi yi-reverse bad.

2. Indlela yokuhlonza i-polarity

a.I-chip resistor ayinayo i-nonpolarity

b.Ungayibona kanjani i-Capacitor polarity

• I-Nonpolarity ye-ceramic capacitor

• I-Tantalum capacitor ine-polarity.Ukumaka okuhle kwe-PCB nezingxenye: 1) ukumakwa kwebhande lombala;2) ukumaka “+”;3) ukumakwa kwe-diagonal

• I-electrolysis namandla e-aluminium ane-polarity.Uphawu lwengxenye: ibhendi yombala imele negative;Uphawu lwe-PCB: ibhendi yombala noma u-“+” umele positive.

3. Indlela yokubona i-inductor polarity

Ÿ Asikho isidingo se-polarity sephakheji yekhoyili ye-chip nezinye izingxenye ezimbili zokushisela.

Ÿ Amaphinikhodi amaningi anezidingo ze-polarity.Uphawu lwengxenye: ichashazi / “1″ imele iphoyinti le-polarity;Uphawu lwe-PCB: ichashazi / indilinga / “*” imele indawo ye-polarity.

4. Ungayibona kanjani i-polarity ye-diode ekhipha ukukhanya

Ÿ I-LED efakwe endaweni ye-SMT ine-polarity.Uphawu olubi lwengxenye: okuluhlaza kunegethivu;uphawu olunegethivu lwe-PCB: 1) ibha eqondile, 2) ibhande lombala, 3) ikhona elicijile lesikrini sikasilika, 4) “匚”yesikrini sikasilika.

5. Indlela yokubona i-diode polarity

Ÿ I-SMT surface mount diode ine-polarity.Ilebula elibi lengxenye: 1) ibhande lombala, 2) igroove, 3) umbala wokumaka (ingilazi);i-negative ekumakeni i-PCB: 1) ibha eqondile ekumaka, 2) umbala ukuya kumaka, 3) ikona elicijile lesikrini sikasilika, 4) “匚” ukumaka

6. Ungayibona kanjani i-polarity ye-IC (Integrated Circuit).

Ÿ Ukupakishwa kohlobo lwe-SOIC kune-polarity.Inkomba ye-polarity: 1) ibhande lombala, 2) uphawu, 3) indawo ye-concave, i-groove, 4) i-bevel.

Ÿ I-SOP noma iphakheji yohlobo lwe-QFP ine-polarity.Inkomba ye-polarity: 1) i-concave / groove yokumaka, 2) elinye lamaphuzu lihlukile kwamanye amaphuzu amabili noma amathathu (usayizi / umumo).

Ÿ Amaphakheji ohlobo lwe-QFN ane-polarity.I-Polarity yokumaka: 1) iphuzu elilodwa lihlukile kwamanye amaphuzu amabili (usayizi / umumo), 2) unqenqema olugobekile ukuya kumaka, 3) uphawu lokumaka (ibha evundlile, “+” , ichashazi)

7. Indlela yokuhlonza (BGA)I-Ball Grid Array polarity

ingxenye polarity: iphuzu concave / groove uphawu / Dot / indilinga ukumaka;I-PCB polarity: indilinga / Ichashazi / 1 noma i-A / diagonal ukumaka.Iphoyinti le-polarity lengxenye lihambisana nephoyinti le-polarity ku-PCB.

(Umbhalo wesithombe usuka kwesobunxele uye kwesokudla, futhi ukusuka phezulu kuye phansi: ichashazi lezingxenye lihambisana nokuphrinta kwesikrini se-PCB “1″, ichashazi lezingxenye lihambisana nokuphrinta kwesikrini se-PCB “1 no-A”, umbuthano iphuzu lezingxenye lihambisana nephuzu le-polarity le-PCB, unqenqema lwe-bevel lwezingxenye luhambisana nephoyinti le-PCB le-polarity, iphuzu lendilinga lezingxenye lihambisana nephuzu le-polarity le-PCB, amaphuzu e-polarity afana kahle, ukufanisa iphuzu le-polarity iphutha, futhi isiqondiso sibuyiselwe emuva)

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