Duk wanda ke da hannu a cikin bugu na allon kewayawa ( PCB ) masana'antu sun fahimci cewa PCBs suna da ƙarancin jan ƙarfe a saman su.Idan an bar su ba tare da kariya ba to jan ƙarfe zai yi oxidize kuma ya lalace, yana mai da allon kewayawa mara amfani.Ƙarshen saman yana samar da mahimmin mu'amala tsakanin abun da PCB.Ƙarshen yana da ayyuka masu mahimmanci guda biyu, don kare bayanan jan ƙarfe da aka fallasa da kuma samar da farfajiyar da za a iya siyar da ita lokacin haɗa (sayar da) abubuwan da aka haɗa zuwa allon da'irar da aka buga.

HASL / Jagorar Kyauta HASL

HASL shine mafi girman saman gama amfani da masana'antu.Tsarin ya ƙunshi nutsar da allunan da'ira a cikin wani narkakkar tukunyar dalma da gubar sannan a cire abin da ya wuce gona da iri ta hanyar amfani da 'wuƙaƙen iska', waɗanda ke hura iska mai zafi a saman allo.

Ɗaya daga cikin fa'idodin da ba a yi niyya ba na tsarin HASL shine cewa zai fallasa PCB zuwa yanayin zafi har zuwa 265 ° C wanda zai gano duk wani matsala mai yuwuwa da kyau kafin a haɗa duk wani abu mai tsada a cikin jirgi.

HASL Ya Kammala Gudun Dabaru Biyu

Amfani:

• Maras tsada
• Yadu Samu
• Mai sake yin aiki
• Kyakkyawan Rayuwar Rayuwa

Rashin hasara:

• Filaye marasa daidaituwa
• Ba Yayi Kyau don Fine Fine ba
• Ya ƙunshi gubar (HASL)
• Thermal Shock
• Solder Bridging
• Toshe ko Rage PTH's (Plated Ta Holes)

Immersion Tin

A cewar IPC, Associationungiyar Haɗa Kayan Wutar Lantarki, Immersion Tin (ISn) ƙaƙƙarfan ƙarfe ne da aka ajiye ta hanyar aikin motsa jiki wanda ake shafa kai tsaye akan tushen ƙarfen allon kewayawa, wato, tagulla.ISn tana kare tushen jan ƙarfe daga oxidation akan rayuwar da aka yi niyya.

Copper da kwano duk da haka suna da alaƙa mai ƙarfi ga juna.Yaduwan karfe ɗaya cikin ɗayan zai faru babu makawa, yana tasiri kai tsaye rayuwar ajiyar ajiya da aikin gamawa.An siffanta mummunan tasirin bunƙasar gwangwani mai kyau a cikin wallafe-wallafen masana'antu da batutuwa na takardu da yawa da aka buga.

Amfani:

• Flat Surface
• Babu Pb
• Mai sake yin aiki
• Babban Zaɓi don Shigar Fitar Fitar Latsa

Rashin hasara:

• Sauƙi don Hana Lalacewa
• Tsarin Yana Amfani da Carcinogen (Thiourea)
• Tin da aka fallasa akan Majalisar Ƙarshe na iya Lalata
• Tin Whiskers
• Ba Yayi Kyau ba don Matsalolin Matsaloli da yawa/Tsarin Taro
• Wahalar Auna Kauri

Azurfa Immersion

Immersion Azurfa shine ƙarewar sinadarai mara amfani da lantarki ta hanyar nutsar da PCB tagulla cikin tanki na ions na azurfa.Yana da kyakkyawan zaɓin gamawa don allunan kewayawa tare da garkuwar EMI kuma ana amfani dashi don lambobi na dome da haɗin waya.Matsakaicin kauri na azurfa shine 5-18 microinches.

Tare da abubuwan da suka shafi muhalli na zamani kamar RoHS da WEE, azurfa nutsewa ta fi kyau muhalli fiye da duka HASL da ENIG.Ya shahara kuma saboda ƙarancin kuɗin sa fiye da ENIG.

Amfani:

• Yana aiki daidai fiye da HASL
• Muhalli mafi kyau fiye da ENIG da HASL
• Rayuwar tsararru daidai take da HASL
• Mafi tsada-tasiri fiye da ENIG

Rashin hasara:

• Dole ne a siyar da shi a cikin ranar da aka cire PCB daga ma'ajiya
• Ana iya lalata shi cikin sauƙi tare da rashin kulawa
• Kadan mai dorewa fiye da ENIG saboda babu Layer na nickel a ƙasa

OSP / Entek

OSP (Organic Solderability Preservative) ko anti-tarnish yana kiyaye saman jan karfe daga iskar shaka ta hanyar amfani da wani siriri mai kariya na kayan abu akan tagulla da aka fallasa yawanci ta amfani da tsari mai ɗaukar nauyi.

Yana amfani da wani abu mai tushen ruwa wanda ke haɗawa da jan ƙarfe da zaɓin zaɓi kuma yana ba da Layer na organometallic wanda ke kare jan ƙarfe kafin siyarwa.Har ila yau, yana da matuƙar kore a muhalli idan aka kwatanta da sauran gamamme marasa gubar gama-gari, waɗanda ke fama da ko dai sun fi mai guba ko yawan amfani da makamashi.

Amfani:

• Flat Surface
• Babu Pb
• Tsari Mai Sauƙi
• Mai sake yin aiki
• Tasirin Kuɗi

Rashin hasara:

• Babu Yadda Ake Auna Kauri
• Ba kyau ga PTH (Plated Ta Ramuka)
• Short Shelf Life
• Zai iya haifar da al'amurran ICT
• Bayyana Cu akan Taro na Karshe
• Gudanar da Hankali

Nickel Immersion Gold (ENIG) maras Wutar Lantarki

ENIG shine rufin ƙarfe biyu na 2-8 μin Au sama da 120-240 μin Ni.Nickel shine shingen jan karfe kuma shine saman da ake siyar da kayan aikin zuwa gareshi.Zinare yana kare nickel yayin ajiya kuma yana ba da ƙarancin juriyar tuntuɓar da ake buƙata don ma'aunin gwal na bakin ciki.ENIG yanzu ana iya cewa shine ƙarshen da aka fi amfani dashi a cikin masana'antar PCB saboda haɓaka da aiwatar da ƙa'idodin RoHs.

Fitar da Wutar Wuta tare da Chem Gold Surface Finish

Amfani:

• Flat Surface
• Babu Pb
• Yayi kyau ga PTH (Plated through Holes)
• Dogon Rayuwa

Rashin hasara:

• Mai tsada
• Ba a sake yin aiki ba
• Black Pad / Black Nickel
• Lalacewa daga ET
• Asarar sigina (RF)
• Tsari mai rikitarwa

Electroless Nickel Electroless Palladium Immersion Gold (ENEPIG)

ENEPIG, sabon dangi zuwa duniyar hukumar da'ira, ya fara fitowa kasuwa a ƙarshen 90s.Wannan rufin ƙarfe mai Layer uku na nickel, palladium, da zinariya yana ba da zaɓi kamar babu sauran: yana da alaƙa.Fasasshiyar farko ta ENEPIG a wani bugu da aka buga a saman allon da'ira mai cike da masana'anta saboda matsanancin tsadar kayan palladium da ƙarancin amfani.

Buƙatar layin masana'anta daban ba ta karɓi waɗannan dalilai guda ɗaya ba.Kwanan nan, ENEPIG ya sake dawowa kamar yadda yuwuwar saduwa da dogaro, buƙatun buƙatun, da ƙa'idodin RoHS ƙari ne tare da wannan gamawa.Ya dace don aikace-aikacen mitoci masu yawa inda aka iyakance tazara.

Idan aka kwatanta da sauran manyan huɗun da aka gama, ENIG, Lead Free-HASL, azurfa immersion da OSP, ENEPIG ya fi komai akan matakin lalata bayan taro.

Amfani:

• Tsananin Wuta Mai Wuta
• Babu Abun Jagora
• Multi-Cycle Assembly
• Kyakkyawan Solder Joints
• Waya Bondable
• Babu Hadarin Lalacewa
• Watanni 12 ko Mafi Girma Rayuwar Rayuwa
• Babu Hadarin Black Pad

Rashin hasara:

• Har yanzu Da ɗan Tsada
• Ana Sake Yin Aiki tare da Wasu Iyakoki
• Iyakokin sarrafawa

Zinariya - Zinariya mai wuya

Hard Electrolytic Zinariya ya ƙunshi nau'in zinari da aka lulluɓe bisa wani shingen shinge na nickel.Zinare mai wuya yana da matuƙar ɗorewa, kuma galibi ana amfani da shi zuwa wuraren da ake sawa da yawa kamar yatsu masu haɗa baki da faifan maɓalli.

Ba kamar ENIG ba, kaurin sa na iya bambanta ta hanyar sarrafa tsawon lokacin zagayowar, kodayake mafi ƙarancin ƙima na yatsu shine 30 μin zinariya akan 100 μin nickel don Class 1 da Class 2, 50 μin zinare sama da 100 μin nickel don Class 3.

Ba a yin amfani da gwal mai wuya ga wuraren da za a iya siyar da su, saboda tsadar sa da kuma rashin ingancin sa.Matsakaicin kauri da IPC ke ɗauka cewa ana iya siyarwa shine 17.8 μin, don haka idan irin wannan nau'in zinari dole ne a yi amfani da shi akan saman da za a siyar da shi, kauri mai ƙima ya kamata ya zama kusan 5-10 μin.

Amfani:

• Hard, Dorewa Surface
• Babu Pb
• Dogon Rayuwa

Rashin hasara:

• Mai tsada sosai
• Ƙarfafa Ƙarfafawa / Ƙarfafa Ƙwararru
• Amfani da Resisst/Tepe
• Ana buƙatar Sandunan Plating/Bas
• Ƙiyata
• Wahala Tare da Sauran Ƙarshen Sama
• Etching etching incing na iya haifar da narkewa / Flacking
• Ba Sayar da Sama da 17 μin
• Ƙarshe Ba Ya Ƙarfafa Cikakkun Rubutun Gefen bangon Hannu, Sai A Yankunan Yatsa

Ana Neman Ƙarshen Sama na Musamman don Hukumar da'ira ta ku?