Yadda ake gane polarity bangaren SMT

Yadda ake gane polarity bangaren SMT

Musamman hankali ya kamata a biya ga polarity aka gyara a cikin dukan PCBA aiki tsari, domin ba daidai ba daidaitacce aka gyara zai haifar da tsari hatsarori da kuma gazawar da dukan.PCBA kwamitin.Don haka, yana da matukar mahimmanci cewa injiniyoyi ko ma'aikatan samarwa su fahimci abubuwan haɗin polarity na SMT.

1. Ma'anar polarity

Polarity yana nufin cewa tabbatacce da korau ko fil na farko na bangaren, da tabbatacce da korau ko fil na farko na PCB suna kan hanya ɗaya.Idan shugabanci na bangaren da allon PCB ba su daidaita ba, ana kiran shi reverse bad.

2. Hanyar gano polarity

a.Chip resistor yana da rashin daidaituwa

b.Yadda ake gane polarity Capacitor

• Rashin ƙarfi na yumbu capacitor

• Tantalum capacitors suna da polarity.Kyakkyawan alamar PCB da abubuwan haɗin gwiwa: 1) alamar band launi;2) alamar "+";3) alamar diagonal

• Electrolysis da capacitance na aluminum suna da polarity.Alamar ɓangaren: band ɗin launi yana wakiltar korau;Alamar PCB: Ƙungiyar launi ko "+" tana wakiltar tabbatacce.

3. Yadda ake gane polarity inductor

Ÿ Babu buƙatar polarity don fakitin guntu coil da sauran ƙarshen walda biyu.

Ÿ Multi fil inductors suna da buƙatun polarity.Alamar ɓangarori: dige / “1 ″ na tsaye ne don ma'anar polarity;Alamar PCB: dige / da'ira / "*" tana tsaye ga ma'anar polarity.

4. Yadda za a gane polarity diode haske emitting

Ÿ SMT surface saka LED yana da polarity.Alamar mara kyau ta bangaren: kore mara kyau;alamar PCB mara kyau: 1) sandar tsaye, 2) bandeji mai launi, 3) kusurwar siliki mai kaifi, 4) “匚” na allo na siliki.

5. Yadda ake gane polarity diode

Ÿ SMT surface Dutsen diode yana da polarity.Label mara kyau na bangaren: 1) band ɗin launi, 2) tsagi, 3) launi don yin alama (gilashi);korau zuwa alamar PCB: 1) sandar tsaye don yin alama, 2) launi don yin alama, 3) kusurwar siliki mai kaifi, 4) “匚” don yin alama

6. Yadda za a gane polarity IC (Integrated Circuit).

Ÿ nau'in nau'in SOIC marufi yana da polarity.Alamar polarity: 1) band mai launi, 2) alama, 3) madaidaicin ma'ana, tsagi, 4) bevel.

Ÿ SOP ko nau'in marufi na QFP yana da polarity.Alamar polarity: 1) concave / tsagi don yin alama, 2) ɗaya daga cikin maki ya bambanta da sauran maki biyu ko uku (girma / siffar).

Ÿ QFN nau'in marufi yana da polarity.Polarity don yin alama: 1) aya ɗaya ya bambanta da sauran maki biyu (girma / siffa), 2) gefuna zuwa yin alama, 3) alama don yin alama (masanin kwance, “+”, dige)

7. Yadda ake gane (BGA)Ball Grid Array polarity

bangaren polarity: concave point / alamar tsagi / Dot / da'irar alama;PCB polarity: da'irar / Dot / 1 ko A / diagonal don yin alama.Ma'anar polarity na bangaren yayi daidai da ma'anar polarity akan PCB.

(Rubutun hoton daga hagu zuwa dama, kuma daga sama zuwa kasa: digon abubuwan da aka gyara ya dace da bugu na allo na PCB “1”, digon abubuwan da aka gyara ya dace da bugu na allo na PCB “1 da A”, da'irar. Ma'anar abubuwan da aka gyara sun dace da ma'anar polarity na PCB, gefen bevel na abubuwan da aka gyara ya dace da ma'aunin polarity na PCB, wurin da'irar abubuwan da aka gyara daidai da ma'aunin polarity na PCB, maki polarity daidai daidai, madaidaicin ma'anar polarity. kuskure, kuma alkibla ta juya)

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