{"id":4967,"date":"2026-05-25T08:17:53","date_gmt":"2026-05-25T08:17:53","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4967"},"modified":"2026-05-25T08:25:01","modified_gmt":"2026-05-25T08:25:01","slug":"fr4-vs-high-speed-pcb-materials","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/fi\/fr4-vs-high-speed-pcb-materials\/","title":{"rendered":"Onko FR-4 paras levymateriaalivalinta nopeaan PCB-suunnitteluun?"},"content":{"rendered":"<p>Kun otamme vastaan projektin, joka on mukavuusalueemme ulkopuolella, olemme kaikki olleet joskus siin\u00e4 tilanteessa. Minulle se p\u00e4iv\u00e4 koitti, kun pomoni pyysi minua suunnittelemaan nopean taulun. Vaikka luulin olevani kokenut piirisuunnittelija, tiesin, ett\u00e4 suurnopeuspiirilevysuunnittelussa oli monia rajoja, joita ei yleens\u00e4 kohdata tavallista piiri\u00e4 suunniteltaessa. Aluksi k\u00e4ytin aikaa siihen, ett\u00e4 sain kaaviota mukautettua suurnopeussuunnitteluun. Mutta kun se oli tehty, keskityin t\u00e4ysin siihen, oliko laitteeni <a href=\"https:\/\/flj-pcb.com\/fi\/pcb-manufacturer\/high-speed-pcb\/\" data-type=\"page\" data-id=\"2370\">nopea PCB <\/a>prototyypin tulisi k\u00e4ytt\u00e4\u00e4 <a href=\"https:\/\/flj-pcb.com\/fi\/fr-4-pcb-guide-properties-limits-material-choices\/\" data-type=\"post\" data-id=\"4641\">FR-4<\/a> tai erikoistuneemmasta materiaalista. Ennen kuin katsomme, mit\u00e4 opin, on t\u00e4rke\u00e4\u00e4 tiet\u00e4\u00e4, ett\u00e4 t\u00e4ss\u00e4 artikkelissa \u201csuurnopeus\u201d tarkoittaa kaikkea yli 50 MHz:n taajuutta. N\u00e4m\u00e4 ovat materiaalikohdat, joihin sinun on kiinnitett\u00e4v\u00e4 huomiota ty\u00f6skennelless\u00e4si t\u00e4ll\u00e4 taajuusalueella.<\/p>\n\n\n\n<p>Suurnopeussuunnittelussa on tiukemmat s\u00e4\u00e4nn\u00f6t signaalin eheyden suhteen kuin muissa suunnittelussa. Vaikka nopeiden signaalien reitityksess\u00e4 on oltava eritt\u00e4in varovainen n\u00e4iden s\u00e4\u00e4nt\u00f6jen noudattamiseksi, on t\u00e4rke\u00e4\u00e4 ymm\u00e4rt\u00e4\u00e4, ett\u00e4 levymateriaali itsess\u00e4\u00e4n on osa koko signaalin eheyden yht\u00e4l\u00f6\u00e4. T\u00e4m\u00e4n vuoksi suurnopeussuunnittelussa k\u00e4ytett\u00e4vien levymateriaalien on oltava ominaisuuksiltaan sellaisia, ett\u00e4 niiden dielektrisyysvakio on tiukasti kontrolloitu, jotta impedanssia voidaan hallita. Jos impedanssin annetaan muuttua koko suunnittelussa, nopeat signaalit alkavat heijastaa energiaa takaisin, kun ne liikkuvat j\u00e4lkien l\u00e4pi, ja signaali v\u00e4\u00e4ristyy. Samoin signaalin eheyden s\u00e4ilytt\u00e4miseksi tarvitaan alhainen h\u00e4vi\u00f6kerroin. L\u00e4mp\u00f6stabiilisuus on toinen t\u00e4rke\u00e4 ominaisuus, koska se auttaa varmistamaan, ettei dielektrinen suorituskyky heikkene.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"615\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/High-Speed-PCB.webp\" alt=\"High-Speed PCB\" class=\"wp-image-4968\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/High-Speed-PCB.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/High-Speed-PCB-300x231.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/High-Speed-PCB-768x590.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/High-Speed-PCB-16x12.webp 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>FR-4: Edut ja haitat<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>Siit\u00e4 l\u00e4htien, kun olen suunnitellut piirilevyj\u00e4, FR-4 on aina ollut piirilevytuotannon vakiomateriaali. Kun olin viel\u00e4 nuorempi suunnittelija, kutsuimme jopa kaikkia levyj\u00e4 \u201cFR-4:ksi\u201d riippumatta siit\u00e4, oliko ne todellisuudessa valmistettu siit\u00e4 vai ei. FR-4 on palonkest\u00e4v\u00e4, lasikuituvahvisteinen epoksilaminaatti, tyyppi 4. Se on eritt\u00e4in kustannustehokas materiaali. Se on my\u00f6s eritt\u00e4in hyv\u00e4 s\u00e4hk\u00f6eriste ja eritt\u00e4in vahva sek\u00e4 kuivissa ett\u00e4 kosteissa olosuhteissa. Sill\u00e4 on my\u00f6s hyv\u00e4 valmistusominaisuus, mik\u00e4 tekee siit\u00e4 eritt\u00e4in hyv\u00e4n materiaalin piirilevyjen rakentamiseen.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"688\" height=\"459\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/fr-4.webp\" alt=\"fr-4\" class=\"wp-image-2743\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/fr-4.webp 688w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/fr-4-300x200.webp 300w\" sizes=\"(max-width: 688px) 100vw, 688px\" \/><\/figure>\n\n\n\n<p>FR-4:n haittapuolena on, ett\u00e4 sill\u00e4 on rajansa, kun teho, j\u00e4nnite tai l\u00e4mp\u00f6 nousevat liian korkeiksi. Jos sen k\u00e4ytt\u00f6rajat ylittyv\u00e4t, FR-4:n dielektrinen suorituskyky heikkenee. T\u00e4m\u00e4 tarkoittaa, ett\u00e4 materiaalin eristyskyky heikkenee ja se alkaa johtaa s\u00e4hk\u00f6\u00e4. Toinen FR-4:n ongelma on vakaan impedanssin s\u00e4ilytt\u00e4minen nopeassa suunnittelussa. T\u00e4m\u00e4 johtuu siit\u00e4, ett\u00e4 FR-4:n dielektrisyysvakio voi muuttua levyn pituuden ja leveyden mukaan. Lis\u00e4ksi suunnittelunopeuden kasvaessa signaalih\u00e4vi\u00f6t, jotka voivat olla hyv\u00e4ksytt\u00e4vi\u00e4 muissa kuin suurnopeusmalleissa, voivat FR-4-levyiss\u00e4 kasvaa liian suuriksi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Erikoistuneet suurnopeuslevymateriaalit vs. FR-4<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>Erityiset suurnopeuskartonkien materiaalit, kuten l\u00e4mp\u00f6kovettuneet hiilivety- ja <a href=\"https:\/\/resources.altium.com\/p\/types-ptfe-materials-rf-pcb-design\" target=\"_blank\" rel=\"noopener\">PTFE-laminaatit<\/a>, voi antaa paremman ja luotettavamman suorituskyvyn kuin FR-4 korkeammilla taajuuksilla toimivissa malleissa. Tarkastelemme kompromisseja my\u00f6hemmin, mutta tarkastellaan ensin joitakin etuja, joita n\u00e4m\u00e4 suurnopeuslevymateriaalit voivat tarjota:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>V\u00e4hemm\u00e4n signaalih\u00e4vi\u00f6it\u00e4.<\/strong>\u00a0Siirtolinjan taajuuden kasvaessa signaalin h\u00e4vi\u00e4misest\u00e4 tulee suurempi ongelma. Suurnopeussuunnittelulevymateriaaleilla on paljon alhaisempi h\u00e4vi\u00f6kerroin kuin FR-4:ll\u00e4, ja jotkin materiaalit, kuten l\u00e4hes puhtaat PTFE-laminaatit, ovat kertaluokkaa parempia. N\u00e4m\u00e4 pienemm\u00e4t h\u00e4vi\u00f6kertoimet ovat t\u00e4rke\u00e4 osa signaalih\u00e4vi\u00f6iden v\u00e4hent\u00e4mist\u00e4.<\/li>\n\n\n\n<li><strong>Tiukempi impedanssin s\u00e4\u00e4t\u00f6.<\/strong>\u00a0Perinteiset piirilevymateriaalit, kuten FR-4, eiv\u00e4t pysty hallitsemaan dielektrisyysvakiota (Dk) yht\u00e4 hyvin kuin nopeat levymateriaalit. FR-4:n Dk voi vaihdella +\/- 10% tai enemm\u00e4n, kun taas PTFE:n kaltaiset materiaalit pit\u00e4v\u00e4t Dk-toleranssin +\/- 2%:ss\u00e4 tai paremmin.<\/li>\n\n\n\n<li><strong>Parempi l\u00e4mm\u00f6nhallinta.<\/strong>\u00a0Joillakin suurnopeussuunnittelulevymateriaaleilla, kuten kestomuovisilla hiilivetylaminaateilla, on paljon parempi l\u00e4mm\u00f6njohtavuus kuin FR-4:ll\u00e4. Jos suunnittelussasi on l\u00e4mm\u00f6nhallintaan liittyvi\u00e4 huolenaiheita, n\u00e4it\u00e4 levymateriaaleja kannattaa tarkastella.<\/li>\n\n\n\n<li><strong>Pienempi kosteuden imeytyminen.<\/strong>\u00a0Vedell\u00e4 on dielektrisi\u00e4 ominaisuuksia, ja jopa pieni m\u00e4\u00e4r\u00e4 kosteutta, joka imeytyy piirilevyyn, jossa on korkeataajuuspiirej\u00e4, voi muuttaa n\u00e4iden piirien s\u00e4hk\u00f6ist\u00e4 suorituskyky\u00e4. Vaikka FR-4:n kosteuden imeytymisaste on l\u00e4hes 50%, joidenkin PTFE-materiaalien kosteuden imeytymisaste on jopa 2%, joten t\u00e4m\u00e4 asia on otettava huomioon.<\/li>\n\n\n\n<li><strong>Parempi mittapysyvyys.<\/strong>\u00a0Kun kyseess\u00e4 on tihe\u00e4, nopea rakenne, jossa on tiukat toleranssit, mittatarkkuuden tarve on entist\u00e4kin t\u00e4rke\u00e4mpi. Vaikka FR-4 on tunnettu mittatarkkuudestaan, se ei tarjoa muita etuja, joita suurnopeusmateriaalit tarjoavat. T\u00e4ss\u00e4 tapauksessa kestomuoviset hiilivetylaminaatit voivat olla parempi valinta.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>When we take on a project that is outside our comfort zone, we have all been there at one time 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