PCB masana'antu lantarki PCB high TG170 12 yadudduka ENIG

Babban Layer PCB (Babban Layer PCB) PCB ne (Printed Circuit Board, printed board) tare da fiye da yadudduka 8. Saboda da abũbuwan amfãni daga Multi-Layer kewaye hukumar, mafi girma kewaye yawa za a iya samu a cikin wani karami sawun, kunna mafi hadaddun da'irar zane, don haka shi ne sosai dace da high-gudun dijital siginar aiki, microwave mitar, modem, high-karshen uwar garken , bayanai ajiya da sauran filayen. Ana yin allunan da'ira masu girma da yawa da allunan TG FR4 masu girma ko wasu kayan aiki masu inganci, waɗanda za su iya kula da kwanciyar hankali a cikin yanayin zafi mai zafi, zafi mai ƙarfi, da yanayin mitoci.

Game da ƙimar TG na kayan FR4

FR-4 substrate ne wani epoxy guduro tsarin, don haka na dogon lokaci, Tg darajar ne ya fi na kowa index amfani da shi don rarraba FR-4 substrate sa, shi ne kuma daya daga cikin mafi muhimmanci aiki Manuniya a cikin IPC-4101 ƙayyadaddun, da Tg darajar guduro tsarin, yana nufin abu daga in mun gwada m ko "gilashi" jihar zuwa sauƙi maras kyau yanayin canji ko matsayi. Wannan canjin thermodynamic koyaushe yana juyawa matuƙar guduro bai ruɓe ba. Wannan yana nufin cewa lokacin da abu ya kasance mai zafi daga yanayin ɗaki zuwa zafin jiki sama da ƙimar Tg, sannan kuma ya sanyaya ƙasa da ƙimar Tg, zai iya komawa yanayin da ya gabata tare da kaddarorin iri ɗaya.

Koyaya, lokacin da aka ƙona kayan zuwa zafin jiki da yawa fiye da ƙimar Tg ɗin sa, ana iya haifar da canje-canjen yanayi mara jujjuyawa. Tasirin wannan zafin jiki yana da alaƙa da nau'in nau'in abu, kuma tare da bazuwar thermal na resin. Gabaɗaya magana, mafi girma Tg na substrate, mafi girman amincin kayan. Idan tsarin walda ba tare da gubar ba, yakamata a yi la'akari da yanayin bazuwar thermal (Td) na ƙasa. Sauran mahimman alamomin aikin sun haɗa da ƙimar haɓaka haɓakar thermal (CTE), shayar da ruwa, kaddarorin mannewa na kayan, da gwajin lokacin da aka saba amfani da su kamar gwajin T260 da T288.

Babban bambanci tsakanin kayan FR-4 shine ƙimar Tg. Dangane da zafin Tg, FR-4 PCB gabaɗaya an raba su zuwa ƙananan Tg, matsakaici Tg da manyan faranti na Tg. A cikin masana'antu, FR-4 tare da Tg kusa da 135 ℃ yawanci ana rarraba su azaman ƙananan Tg PCB; FR-4 a kusan 150 ℃ aka canza zuwa matsakaici Tg PCB. FR-4 tare da Tg kusa da 170 ℃ an rarraba shi azaman babban Tg PCB. Idan akwai lokuta masu yawa, ko PCB yadudduka (fiye da yadudduka 14), ko zafin walda mai girma (≥230 ℃), ko zafin aiki mai girma (fiye da 100 ℃), ko matsanancin damuwa na walƙiya (kamar soldering), babban Tg PCB ya kamata a zaɓi.