The Definitive Guide to High-Speed ​​PCB le Housing Materials

Li-PCB tsa lebelo le phahameng le thepa ea matlo ke likarolo tsa bohlokoa ho lisebelisoa tsa elektroniki tsa sejoale-joale, tse nolofalletsang phetisetso ea mats'oao a motlakase ka lebelo le phahameng ha e ntse e laola ka nepo ho felloa ke mocheso. Lisebelisoa tsena li entsoe ka hloko ho fihlela litlhoko tsa lits'ebetso tsa maqhubu a holimo, joalo ka sefofane, ts'ireletso, likhokahano le lisebelisoa tsa bongaka. Tataisong ena e felletseng, re tla hlahloba litšobotsi, melemo, mathata, le ts'ebeliso ea lisebelisoa tse fapaneng tsa lebelo le phahameng tsa PCB le matlo, ho u thusa ho etsa liqeto tse nepahetseng bakeng sa merero ea hau.

Li-PCB tsa lebelo le phahameng ke life?

Liboto tsa Potoloho tse Hatisitsoeng ka lebelo le phahameng (PCBs) ke liboto tse khethehileng tsa potoloho tse etselitsoeng ho sebetsana le mats'oao a maqhubu a phahameng a nang le phokotso e nyane ea matšoao. Liboto tsena ke likarolo tsa bohlokoa tsa lisebelisoa tsa elektroniki tsa sejoale-joale, tse nolofalletsang phetiso ea data ka lebelo le hlokahalang bakeng sa lits'ebetso tse joalo ka likhokahano tsa mehala, lisebelisoa tsa marang-rang, le likhomphutha tse sebetsang hantle haholo.

Li-PCB tsa lebelo le phahameng li fapane le li-PCB tsa setso ka moralo oa tsona le lisebelisoa ho amohela litlhoko tse ikhethang tsa matshwao a maqhubu a phahameng. Li etselitsoe ho fokotsa tahlehelo ea lets'oao, ho se tsamaisane, le tšitiso ea motlakase (EMI), ho netefatsa phetisetso ea data e tšepahalang. Li-PCB tsa lebelo le phahameng hangata li na le mesaletsa e laoloang, li-stackups tse ikhethileng, le lisebelisoa tsa boleng bo holimo ho fihlela litlhoko tsena.

Likarolo tsa bohlokoa tsa li-PCB tse lebelo le holimo li kenyelletsa:

1. Tšireletso e Laoloang: Li-PCB tse lebelo le phahameng li sebelisa mekhoa e laoloang ea impedance ho tsamaisana le ho sitisa mohala oa phetisetso, ho fokotsa lipontšo tsa matšoao le ho netefatsa botšepehi ba matšoao.
2. Botšepehi ba Letšoao: Ho boloka botšepehi ba lets'oao ho bohlokoa ho li-PCB tse lebelo le holimo ho thibela ho sotha ha matšoao, liphoso tsa data le tšitiso ea motlakase.
3. Lisebelisoa tsa Tahlehelo e tlase: Li-PCB tse lebelo le phahameng hangata li sebelisa tahlehelo e tlase lisebelisoa tsa dielectric ho fokotsa phokotso ya lets'oao ka maqhubu a phahameng.
4. Ho Theha le Kabo ea Matla: Ho beha fatše ka nepo le kabo ea matla ho bohlokoa bakeng sa ho fokotsa lerata le ho netefatsa phepelo e tsitsitseng ea matla meralong e potlakileng.
5. EMI Shielding: Li-PCB tse lebelo le phahameng li ka kenyelletsa mekhoa ea ho sireletsa ho fokotsa tšitiso ea motlakase, ho netefatsa ts'ebetso e tšepahalang libakeng tse lerata.

Ka kakaretso, li-PCB tse lebelo le phahameng li bohlokoa bakeng sa lits'ebetso tse hlokang phetiso ea data e potlakileng le e tšepahalang, e leng se etsang hore e be likarolo tsa bohlokoa indastering e fapaneng, ho kenyeletsoa le likhokahano tsa mehala, marang-rang le khomphutha.

Lisebelisoa tsa PCB tsa lebelo le phahameng

Lisebelisoa tsa PCB tsa lebelo le phahameng li bohlokoa bakeng sa ho netefatsa ts'epo le ts'ebetso ea lisebelisoa tsa elektroniki tsa maqhubu a holimo. Lisebelisoa tsena li etselitsoe ho fokotsa tahlehelo ea matšoao, ho laola ho thibela mocheso, le ho laola ho qhala ha mocheso, ho etsa hore e be tsa bohlokoa bakeng sa lits'ebetso tse hlokang phetiso ea data ka potlako. Lisebelisoa tse ling tse tloaelehileng tsa lebelo le phahameng tsa PCB li kenyelletsa:

EA-4

FR-4 ke thepa e sebelisoang haholo ho li-PCB ka lebaka la matla a eona a phahameng a mochini, thepa e ntle ea dielectric, le litšobotsi tse thibelang malakabe. E fana ka khanyetso e ntle ea mocheso le khanyetso ea oxidation, e etsa hore e tšoanelehe bakeng sa tikoloho e boima joalo ka sefofane le ts'ireletso.

Phetoho e sa Feleng ea Dielectric le ho Hasana: Li-laminate tsa FR-4 hangata li na le li-constant tsa dielectric tse pakeng tsa 3.8 le 4.8. Phetoho e sebetsang ea dielectric bakeng sa masimo a lipontšo pakeng tsa li-traces botong e itšetlehile ka lintlha tse kang phetoho le tokisetso ea sefofane.

Melemo: FR-4 e bobebe, ha e na modumo, ebile ha e angoe ke mongobo, e leng se etsang hore e be ntle bakeng sa lits'ebetso tse fapaneng tsa indasteri, ho kenyeletsoa lits'ebetso tsa ho robeha ha indasteri le ho thibela motlakase.

Mathata: Thepa ea dielectric ea FR-4 e ka senyeha haeba e ka sebelisoa ka matla a feteletseng, motlakase, kapa mocheso, e leng se fokotsang tšebeliso ea eona lits'ebetsong tsa elektroniki tse nang le matla a maholo.

Ditshebediso: FR-4 e sebediswa hangata ditshebedisong tsa ho robeha ha diindasteri, ho kwahela motlakase, le dikarolong tse fapaneng tse kang di-screw terminal strips, di-transformer, le di-busbars.

laminate e khethehileng ea tahlehelo e tlase 4350B

Laminate e khethehileng ea 4350B e nang le tahlehelo e tlase e tsebahala ka ho tšepahala ha eona le ts'ebetso e phahameng lits'ebetsong tsa maqhubu a phahameng. E fana ka matla a matle a mechini, boleng bo tlase ba CTE, 'me e sebetsa ka katleho mochesong o fihlang ho 260°C le maqhubu a fihlang ho 4 GHz.

Ntlha e sa Feleng ea Dielectric le ea ho Qhala: laminate e khethehileng ea 4350B e na le ntlha e sa Feleng ea Dielectric e phahameng ea 3.48 +/- 0.05, e loketseng lipotoloho tse nang le maqhubu a phahameng, le ntlha e sa Feleng ea ho Qhala e loketseng maqhubu a ho fihlela ho 40 GHz.

Melemo: laminate e khethehileng ea tahlehelo e tlase ea 4350B e fana ka katoloso e tlase ea mocheso, bokhoni bo ntlafetseng, tahlehelo e tlase ea lets'oao, le phallo e phahameng ea mocheso, e leng se etsang hore e lokele likarolo tsa maqhubu a phahameng le ho qhalana ha mocheso.

Ditshebediso: laminate e ikgethang e nang le tahlehelo e tlase 4350B e sebediswa hangata dikopanong tsa microwave le RF, dipotoloho tse nang le maqhubu a phahameng, le dikarolo tsa potoloho tse hatisitsweng.

Isola IS620

Isola IS620 e etselitsoe lits'ebetso tsa lebelo le holimo ho tloha ho 2 ho isa ho 15 GHz, e fanang ka tahlehelo e tlase ho maqhubu le karabelo e bataletseng. E kopanya ho feto-fetoha ha moralo oa dijithale le mekhoa e tloaelehileng ea ts'ebetso ea FR-4.

Melemo: Isola IS620 e fana ka dielectric constant e phahameng, factor e fokolang ea ho qhalana maqhubung a fapaneng, bokhoni ba ho thibela UV, 'me e latela RoHS, e leng se etsang hore e lokele meralo ea lihlahisoa tse tsoetseng pele.

Mathata: Litlamo tse fokolang tsa Isola IS620 li ka angoa ke mocheso oa ho phunya, e leng se lebisang ho qhala ha mocheso hampe le matšoao a senyehang.

Ditshebediso: Isola IS620 e sebediswa ditshebedisong tsa maqhubu a millimeter, ditransceiver tsa sathelaete ya sebaka, dihokelo tsa microwave tsa E-band point-to-point, di-scanner tsa bongaka, disebediswa tsa indasteri le disebediswa tsa mahlale.

Thepa ea Bolulo ea Lebelo le Phahameng

Thepa ea Matlo a Lebelo le Phahameng e bapala karolo ea bohlokoa ho sireletseng le ho tšehetsa li-PCB tse lebelo le phahameng. Mona, re buisana ka thepa e meraro ea bohlokoa e sebelisoang lits'ebetsong tsa lebelo le phahameng: Liquid Crystal Polymer (LCP), Polytetrafluoroethylene ( PTFE ), le Liquid Silicone Rubber (LSR).

Liquid Crystal Polymer (LCP):

• le menyetla: LCP e fana ka matla a phahameng a mochini, ho hanyetsa mocheso, le ho hanyetsa lelakabe. E boloka thepa e tsitsitseng maemong a mabeli a tiileng le a metsi, e etsa hore e tšoanelehe bakeng sa ho bōptjoa ha ente.
• go tlhoka mesola: LCP e etsa mela e fokolang ea weld ha e fetisoa 'me e na le anisotropic haholo, e amang botsitso ba sebopeho.
• dikopo: LCP e sebelisoa likarolong tsa likoloi, boenjiniere ba lifofane, lisebelisoa tsa bongaka le lijana tsa lijo.

Polytetrafluoroethylene (PTFE):

• le menyetla: PTFE e na le khohlano e tlase, e sa cheng, ea ho itlhoekisa, e tšoarella nako e telele, 'me ha e che ebile ha e bolae ke kutu.
• go tlhoka mesola: PTFE e theko e boima, e thata ho e hlahisa ka bongata, e fetola sebopeho ka mocheso kapa khatello, 'me e thata ho e cheseletsa.
• dikopo: PTFE e sebelisoa ho boenjiniere ba sefofane, lisebelisoa tsa bongaka, masela a thepa ea ka tlung, lihlahisoa tsa likoloi, le tse ling.

Liquid Silicone Rubber (LSR):

• le menyetla: LSR e na le inertness e ntle ea lik'hemik'hale, e hanyetsanang le libaktheria, leseli la UV, ozone le mahlaseli a kotsi, le ho kenella ha khase e phahameng.
• go tlhoka mesola: LSR ha e sebelisoe hape, e nka nako ho phekoloa, 'me e hloka taolo e hlokolosi ea maemo a ts'ebetso.
• dikopo: LSR e sebelisoa ho lisebelisoa tsa tsamaiso ea lifofane, lisebelisoa tsa IV tsa ho ngolla, li-gaskets tsa likoloi, lisebelisoa tsa elektronike le lisebelisoa tsa thepa ea bareki.

E 'ngoe le e' ngoe ea lisebelisoa tsena e fana ka melemo le melemo e ikhethang, e etsa hore e tšoanelehe bakeng sa likopo tse fapaneng tsa elektronike tse lebelo. Ho utloisisa thepa le lits'ebetso tsa bona ho ka thusa baenjiniere ho khetha thepa e nepahetseng bakeng sa litlhoko tsa bona tse ikhethang.

Ho Khetha Boitsebiso bo Nepahetseng

Ha u khetha lisebelisoa bakeng sa li-PCB tse lebelo le matlo, lintlha tse 'maloa tsa bohlokoa li lokela ho nahanoa ho netefatsa ts'ebetso e nepahetseng le ho ts'epahala. Lintlha tse joalo ka Coefficient of Thermal Expansion (CTE), The Decomposition Temperature, Moisture Absorption, le Mechanical Properties li bapala karolo ea bohlokoa ts'ebetsong ea khetho. Ho bohlokoa ho bapisa lisebelisoa tse fapaneng ho latela lintlha tsena ho etsa qeto e nang le tsebo.

Ka kakaretso, ho khetha thepa e nepahetseng bakeng sa li-PCB tse lebelo le phahameng le matlo a hokelang ho bohlokoa bakeng sa ho fihlela liphetho tse atlehileng mererong ea hau. Ho utloisisa thepa, melemo, mefokolo le ts'ebeliso ea thepa ka 'ngoe ho bohlokoa bakeng sa ho etsa liqeto tse nang le tsebo. Khetha thepa e lumellanang hantle le litlhoko tsa hau tse ikhethileng ho netefatsa ts'ebetso e ntle le ts'epo meralong ea hau ea elektroniki e lebelo le phahameng.

fihlela qeto e

Ho khetha PCB ea lebelo le phahameng le thepa ea matlo ke ea bohlokoa ho netefatsa ts'epo le ts'ebetso ea lisebelisoa tsa elektroniki. Baqapi ba tlameha ho nahana ka hloko lintlha tsa bohlokoa le thepa ea thepa ka 'ngoe ho etsa liqeto tse nang le tsebo tse lumellanang le litlhoko tsa lits'ebetso tsa bona tse ikhethileng. Khetho e nepahetseng e ka ama haholo ts'ebetso e akaretsang, nako e telele, le katleho ea lihlahisoa tsa elektroniki, e leng se etsang hore e be mohato oa bohlokoa molemong oa moralo le tlhahiso.