{"id":4641,"date":"2026-01-19T09:23:39","date_gmt":"2026-01-19T09:23:39","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4641"},"modified":"2026-01-19T09:23:44","modified_gmt":"2026-01-19T09:23:44","slug":"fr-4-pcb-guide-properties-limits-material-choices","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/fi\/fr-4-pcb-guide-properties-limits-material-choices\/","title":{"rendered":"FR-4 PCB-opas: Materiaalivalinnat: Ominaisuudet, rajat ja materiaalivalinnat"},"content":{"rendered":"<h2 class=\"wp-block-heading\">fr4 - m\u00e4\u00e4ritelm\u00e4 ja merkitys<\/h2>\n\n\n\n<p>fr4 on koodi lasikuituvahvisteisen epoksikuparilla p\u00e4\u00e4llystetyn laminaatin palonkest\u00e4vyysluokitukselle. Se tarkoittaa, ett\u00e4 hartsin on lopetettava palaminen itsest\u00e4\u00e4n sytytyksen j\u00e4lkeen. fr4 ei ole tietyn materiaalin nimi. Se on PCB-levyiss\u00e4 (painetut piirilevyt) k\u00e4ytetty materiaaliluokka.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">koostumus ja yleiset tyypit<\/h2>\n\n\n\n<p>Tavallisissa piirilevyiss\u00e4 k\u00e4ytet\u00e4\u00e4n monenlaisia fr4-materiaaleja. Useimmat ovat komposiittimateriaaleja, jotka on valmistettu niin sanotusta tetrafunktionaalisesta epoksihartsista sek\u00e4 t\u00e4yteaineista ja lasikuidusta.<\/p>\n\n\n\n<p>Esimerkki: jos piirilevyn spekseiss\u00e4 lukee <strong>fr4 T:1.0 D\/S<\/strong>, se tarkoittaa: fr4 paloturvallinen luokka, T:1.0 tarkoittaa paksuus 1.0 mm, D\/S tarkoittaa kaksipuolinen. Toisin sanoen levymateriaali on epoksilasi-kangas kaksipuoleinen kuparipinnoitettu laminaatti, 1 mm paksu, kaksipuolinen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">fr4 - t\u00e4rkeimm\u00e4t ominaisuudet ja luokitukset<\/h2>\n\n\n\n<p>Teknisesti fr4-laminaateilla on joukko keskeisi\u00e4 ominaisuuksia. N\u00e4it\u00e4 ovat mm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>taivutuslujuus ja kuorintalujuus sek\u00e4 l\u00e4mp\u00f6shokkisuorituskyky;<\/li>\n\n\n\n<li>voimakas palonesto;<\/li>\n\n\n\n<li>tilavuusresistiivisyys ja pintaresistiivisyys;<\/li>\n\n\n\n<li>dielektrisyysvakio (Dk) ja h\u00e4vi\u00f6kerroin (h\u00e4vi\u00f6tangentti);<\/li>\n\n\n\n<li>lasittumisl\u00e4mp\u00f6tila (Tg);<\/li>\n\n\n\n<li>mittapysyvyys, enimm\u00e4isk\u00e4ytt\u00f6l\u00e4mp\u00f6tila ja v\u00e4\u00e4ntyminen.<\/li>\n<\/ul>\n\n\n\n<p>N\u00e4m\u00e4 ominaisuudet yhdess\u00e4 m\u00e4\u00e4rittelev\u00e4t fr4:n suorituskyvyn piirilevyjen valmistuksessa.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">muut yleiset PCB-perusmateriaalit<\/h2>\n\n\n\n<p>\u25c9 Lasikangaspohjaiset levyt<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Lasikangaslevyt: fr4 ja fr5<br>Molemmissa k\u00e4ytet\u00e4\u00e4n erityist\u00e4 elektronista kangasta, joka on kastettu epoksihartsilla (tai epoksifenolihartsilla). Sitten ne kovetetaan korkeassa l\u00e4mm\u00f6ss\u00e4 ja paineessa. fr4 on piirilevyjen valmistuksessa eniten k\u00e4ytetty levy. Sill\u00e4 on hyv\u00e4t s\u00e4hk\u00f6iset ominaisuudet, hyv\u00e4 mekaaninen lujuus ja l\u00e4mm\u00f6nkest\u00e4vyys. Sit\u00e4 k\u00e4ytet\u00e4\u00e4n laajalti monikerroksisten piirilevyjen valmistuksessa.<\/li>\n<\/ol>\n\n\n\n<p>\u25c9 Paperipohjaiset levyt<br>2. Paperikartongit: fr-1, fr-2, fr-3.<br>Fenolipaperilevyiss\u00e4 k\u00e4ytet\u00e4\u00e4n fenolihartsia sideaineena ja puumassasta valmistettua kuitukangasta pinnanvahvistuksena. Ne valmistetaan korkeassa kuumuudessa ja paineessa.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards.webp\" alt=\"Paper based boards\" class=\"wp-image-4642\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-300x169.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-768x432.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>\u25c9 Komposiittilevyt<br>3. Komposiittilevyt: CEM-1 ja CEM-3<br>Komposiittilevyihin kuuluu CEM-sarjan kuparip\u00e4\u00e4llysteiset laminaatit. CEM-1:ss\u00e4 k\u00e4ytet\u00e4\u00e4n ytimen\u00e4 epoksipaperia. CEM-3:ssa k\u00e4ytet\u00e4\u00e4n ytimen\u00e4 epoksilasikuitukangasta. N\u00e4it\u00e4 CEM-levyj\u00e4 on helppo k\u00e4sitell\u00e4. Niill\u00e4 on hyv\u00e4 litteys, mittapysyvyys ja tarkka paksuus. Niiden mekaaninen lujuus, dielektriset ominaisuudet, veden imeytyminen ja metallien siirtymisen kest\u00e4vyys ovat kaikki parempia kuin paperilevyjen. CEM-3-levyill\u00e4 voidaan saavuttaa noin 80% fr4:n mekaaninen lujuus, mutta ne ovat yleens\u00e4 halvempia.<\/p>\n\n\n\n<p>\u25c9 Erikoismateriaalilevyt<br>4. Erityislevyt (esim, <a href=\"https:\/\/flj-pcb.com\/fi\/pcb-manufacturer\/ceramic-pcb\/\" data-type=\"page\" data-id=\"2364\">keramiikka ja metalli<\/a>)<br>N\u00e4ihin kuuluvat keraamiset alustat ja metalliydinlevyt. Niill\u00e4 on erityisominaisuuksia sovelluksia varten, joissa tarvitaan korkeampaa materiaalin suorituskyky\u00e4.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"500\" height=\"469\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb.webp\" alt=\"ceramic pcb\" class=\"wp-image-4643\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb.webp 500w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb-300x281.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb-13x12.webp 13w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">fr4:n edut ja rajoitukset<\/h2>\n\n\n\n<p>Siit\u00e4 l\u00e4htien, kun aloitin piirilevyjen suunnittelun, fr4 on ollut standardi levymateriaali. Aluksi jotkut suunnittelijat kutsuivat jokaista levy\u00e4 \u201cfr4:ksi\u201d, oli se sitten sit\u00e4 tai ei. fr4 on paloturvallinen, tyypin 4 lasikuituvahvisteinen epoksilaminaatti. Se on kustannustehokas. Se on hyv\u00e4 s\u00e4hk\u00f6eriste. Se on luja sek\u00e4 kuivissa ett\u00e4 kosteissa olosuhteissa. Se on my\u00f6s helppo valmistaa levyiksi. N\u00e4ist\u00e4 syist\u00e4 fr4 on yleinen valinta piirilevyjen rakentamiseen.<\/p>\n\n\n\n<p>fr4:ll\u00e4 on rajansa. Se voi joutua ongelmiin, kun tehoa, j\u00e4nnitett\u00e4 tai l\u00e4mp\u00f6\u00e4 on liikaa. Jos sit\u00e4 k\u00e4ytet\u00e4\u00e4n yli sen rajojen, sen dielektriset ominaisuudet heikkenev\u00e4t. Se tarkoittaa, ett\u00e4 materiaali menett\u00e4\u00e4 erist\u00e4vyytens\u00e4 ja alkaa johtaa. Toinen ongelma on vakaan impedanssin s\u00e4ilytt\u00e4minen nopeissa malleissa. fr4:n dielektrisyysvakio voi vaihdella levyn pituuden ja leveyden mukaan. Suunnittelunopeuksien kasvaessa signaalih\u00e4vi\u00f6t, jotka olivat hyv\u00e4ksytt\u00e4vi\u00e4 matalanopeuslevyiss\u00e4, voivat muuttua liian suuriksi fr4-levyiss\u00e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">onko fr4 paras valinta nopeaan PCB-suunnitteluun?<\/h2>\n\n\n\n<p>Kun ryhdymme projektiin mukavuusalueemme ulkopuolella, opimme uusia rajoja. Minulle se p\u00e4iv\u00e4 koitti, kun pomoni pyysi minulta er\u00e4st\u00e4 <a href=\"https:\/\/flj-pcb.com\/fi\/pcb-manufacturer\/high-speed-pcb\/\" data-type=\"page\" data-id=\"2370\">nopeak\u00e4yntinen piirilevy<\/a>. Tiesin, ett\u00e4 suurnopeussuunnittelussa on rajoja, joita emme n\u00e4e tavallisissa piireiss\u00e4. Ensin tein kaavion, joka soveltuu suurelle nopeudelle. Sitten keskityin siihen, pit\u00e4isik\u00f6 suurnopeusprototyypiss\u00e4 k\u00e4ytt\u00e4\u00e4 fr4:\u00e4\u00e4 vai jotakin erikoisempaa materiaalia. Ennen kuin valitset, huomaa, ett\u00e4 t\u00e4ss\u00e4 tekstiss\u00e4 \u201csuurnopeus\u201d tarkoittaa kaikkea yli <strong>50 MHz<\/strong>. N\u00e4m\u00e4 ovat olennaisia huolenaiheita kyseisell\u00e4 taajuusalueella.<\/p>\n\n\n\n<p>Suurnopeussuunnittelussa on tiukemmat s\u00e4\u00e4nn\u00f6t signaalin eheyden suhteen. Reitityst\u00e4 on valvottava tarkasti, jotta n\u00e4m\u00e4 s\u00e4\u00e4nn\u00f6t t\u00e4yttyv\u00e4t. Levymateriaali itsess\u00e4\u00e4n on kuitenkin osa signaalien eheyden yht\u00e4l\u00f6\u00e4. Nopeiden piirilevyjen materiaalissa on siis oltava tiukka Dk-toleranssi ja muita kontrolloituja ominaisuuksia impedanssin hallitsemiseksi. Jos impedanssi vaihtelee koko suunnittelussa, nopeat signaalit heijastavat energiaa takaisin kulkiessaan ja signaali v\u00e4\u00e4ristyy. My\u00f6s alhainen h\u00e4vi\u00f6tangentti auttaa pit\u00e4m\u00e4\u00e4n signaalin vahvana. Lopuksi l\u00e4mp\u00f6stabiilisuus auttaa varmistamaan, ett\u00e4 dielektriset ominaisuudet eiv\u00e4t hajoa.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">miten erikoisvalmisteiset suurnopeusmateriaalit ovat verrattavissa fr4:\u00e4\u00e4n?<\/h2>\n\n\n\n<p>Erityiset suurnopeusmateriaalit, kuten kestomuoviset hiilivetylaminaatit ja PTFE-laminaatit, tuottavat usein paremman ja luotettavamman suorituskyvyn korkeammilla taajuuksilla toimivissa rakenteissa kuin fr4. Alla on lueteltu joitakin n\u00e4iden materiaalien keskeisi\u00e4 etuja:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"525\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb.webp\" alt=\"high-speed pcb\" class=\"wp-image-4645\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb-300x225.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb-16x12.webp 16w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>V\u00e4hent\u00e4\u00e4 signaalih\u00e4vi\u00f6t\u00e4.<\/strong> Siirtolinjan taajuuden kasvaessa signaalin h\u00e4vi\u00f6 kasvaa. Suurnopeuslaminaateilla on paljon pienempi h\u00e4vi\u00f6tangentti kuin fr4:ll\u00e4. Jotkin materiaalit, kuten l\u00e4hes puhtaat PTFE-laminaatit, ovat kertaluokkaa parempia. Pienempi h\u00e4vi\u00f6tangentti on keskeinen tekij\u00e4 signaalih\u00e4vi\u00f6iden v\u00e4hent\u00e4misess\u00e4.<\/li>\n\n\n\n<li><strong>Tiukempi impedanssin s\u00e4\u00e4t\u00f6.<\/strong> Perinteiset materiaalit, kuten fr4, eiv\u00e4t pysty pit\u00e4m\u00e4\u00e4n dielektrisyysvakiota (Dk) yht\u00e4 tiukasti kuin nopeat materiaalit. fr4:n Dk voi vaihdella \u00b110% tai enemm\u00e4n. PTFE:n kaltaiset materiaalit pystyv\u00e4t pit\u00e4m\u00e4\u00e4n Dk:n noin \u00b12%:n sis\u00e4ll\u00e4 tai paremmin.<\/li>\n\n\n\n<li><strong>Parempi l\u00e4mm\u00f6nhallinta.<\/strong> Joidenkin suurnopeuslaminaattien (esimerkiksi kestomuovattujen hiilivetylaminaattien) l\u00e4mm\u00f6njohtavuus on paljon parempi kuin fr4:n. Jos suunnittelussasi on hallittava l\u00e4mp\u00f6\u00e4, n\u00e4it\u00e4 laminaatteja kannattaa tutkia.<\/li>\n\n\n\n<li><strong>Alhaisempi kosteuden imeytyminen.<\/strong> Vedell\u00e4 on dielektrisi\u00e4 vaikutuksia. Pienikin kosteus piirilevyss\u00e4 voi muuttaa suurtaajuuspiirien s\u00e4hk\u00f6ist\u00e4 suorituskyky\u00e4. Vaikka tekstiss\u00e4 sanotaan, ett\u00e4 fr4-kosteuden imeytyminen on l\u00e4hell\u00e4 50%, joillakin suurnopeusmateriaaleilla (esimerkiksi joillakin PTFE-laminaateilla) kosteuden imeytyminen voi olla paljon alhaisempi, l\u00e4hell\u00e4 2%, ja t\u00e4m\u00e4 auttaa s\u00e4ilytt\u00e4m\u00e4\u00e4n vakaan s\u00e4hk\u00f6isen k\u00e4ytt\u00e4ytymisen.<\/li>\n\n\n\n<li><strong>Vahvempi mittapysyvyys.<\/strong> Tihe\u00e4t, nopeat layoutit vaativat tiukkaa mittojen hallintaa. fr4 on tunnettu hyv\u00e4st\u00e4 mittojen vakaudesta, mutta jotkin nopeat materiaalit tarjoavat paremman kokonaissuorituskyvyn tiukkojen toleranssien suunnittelussa. T\u00e4llaisissa tapauksissa kestomuoviset hiilivetylaminaatit voivat olla parempi valinta.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>fr4 \u2014 definition and meaning fr4 is the code for the flame-retardant rating of a glass-fiber reinforced epoxy copper clad 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