Yadda Ake Zaɓan Ƙarshen Surface don Ƙirar PCB ɗinku
---Jagorar Kwararru zuwa PCB Surface ya ƙare
Ⅰ Menene kuma Ta yaya
An buga:Nov15 ga Nuwamba, 2022
Rukunin: Blogs
Tags: pcb,pcba,pcb taro,pcb manufacturer, pcb ƙirƙira
Idan ya zo ga ƙare saman, akwai zaɓuɓɓuka daban-daban, misali HASL, OSP, ENIG, ENEPIG, Hard Gold, ISn, IAg, da sauransu. zinariya;HASL ko HASL-kyauta an fi so don manyan abubuwan haɗin SMT.Koyaya, yana iya zama da wahala a zaɓi gamawa ɗaya don ku allon HDI tare da Ball Grid Arrays (BGAs) idan babu wasu alamu.Akwai dalilai kamar kasafin kuɗin ku don wannan aikin, buƙatun aminci ko ƙuntatawa na lokacin aiki yana buƙatar la'akari da wasu sharuɗɗan.Kowane nau'in gamawar PCB yana da ribobi da fursunoni, yana iya zama da ruɗani ga masu zanen PCB don yanke shawarar wanda ya dace da allon PCB ɗin ku.Mun zo nan don taimaka muku gano su tare da gogewar shekaru masu yawa na masana'anta.
1. Menene PCB surface gama
Aiwatar da ƙarewar saman (maganin saman / saman shafi) yana ɗaya daga cikin matakai na ƙarshe na ƙirƙira PCBs.Ƙarshen farfajiyar yana samar da mahimmanci mai mahimmanci tsakanin jirgi na PCB maras kyau da abubuwan da aka gyara, yana aiki don dalilai guda biyu masu mahimmanci, don samar da shimfidar wuri don taron PCB da kuma kare sauran da aka fallasa tagulla ciki har da burbushi, pads, ramuka da jiragen ƙasa daga iskar shaka ko gurɓatawa, yayin da abin rufe fuska na solder ya rufe yawancin kewayawa.
Ƙarshen saman zamani ba su da gubar, daidai da Ƙuntatawar Abubuwa masu haɗari (RoHS) da Sharar Wutar Lantarki da Kayan Lantarki (WEEE).Zaɓuɓɓukan gama saman PCB na zamani sun haɗa da:
- ● LF-HASL (Leveling Free Hot Air Solder Leveling)
- ● OSP (Organic Solderability Preservatives)
- ● ENIG (Zinaren Nickel Immersion maras Wutar Lantarki)
- ● ENEPIG (Mai amfani da Nickel Electroless Palladium Immersion Zinare)
- ● Electrolytic Nickel/Gold - Ni/Au (Zinare Mai Wuya/Taushi)
- ● Azurfa Immersion, IAg
- ●Farar Tin ko Immersion Tin, ISn
2. Yadda za a zabi surface gama for your PCB
Kowane nau'in gamawar PCB yana da ribobi da fursunoni, yana iya zama da ruɗani ga masu zanen PCB don yanke shawarar wanda ya dace da allon PCB ɗin ku.Zaɓin daidai don ƙirar ku yana buƙatar ɗaukar abubuwa da yawa cikin la'akari kamar haka.
- ★ Budge
- ★ Allon allo na ƙarshe na aikace-aikacen yanayi (misali zazzabi, girgiza, RF).
- ★ Abubuwan buƙatun don neman jagora kyauta, abokantaka na muhalli.
- ★ Bukatun dogaro ga hukumar PCB.
- ★ Nau'in kayan aikin, yawa ko buƙatun don taro misali latsa fit, SMT, haɗin waya, soldering ta rami, da sauransu.
- ★ Bukatun ga surface flatness na SMT gammaye ga BGA aikace-aikace.
- ★ Bukatun ga Shelf rayuwa da reworkability na surface gama.
- ★ Girgizawa/juriya.Misali, ENIG bai dace da waya mai wayo ba tunda wayowar wayar tana buƙatar haɗin gwano-jan ƙarfe don tsananin girgiza da juriya maimakon haɗin tin-nickel.
- ★ Yawa da Kayan aiki.Don yawan adadin PCBs, tin nutsewa na iya zama mafi aminci da zaɓuɓɓuka masu tsada fiye da ENIG da Azurfa Immersion kuma ana iya guje wa al'amuran hankali.Akasin haka, azurfa nutsewa ta fi ISn a ƙaramin tsari.
- ★ Lalacewar lalacewa ko gurbacewa.Misali, gamawar azurfar nutsewa tana da saurin lalacewa.Dukansu OSP da tin Immersion suna da kula da lalacewa.
- ★ Aesthetics na allo, da sauransu.
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