{"id":5893,"date":"2026-07-05T08:36:00","date_gmt":"2026-07-05T00:36:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=5893"},"modified":"2026-06-24T16:50:40","modified_gmt":"2026-06-24T08:50:40","slug":"high-tg-fr4-pcb","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/","title":{"rendered":"Korkean TG-arvon FR4-piirilevyjen materiaaliopas"},"content":{"rendered":"<p>Korkean TG-arvon FR4-materiaali viittaa epoksilasikuitulaminaattien luokkaan, jolla on korkea lasittumisl\u00e4mp\u00f6tila. K\u00e4yt\u00e4nn\u00f6ss\u00e4 <a href=\"https:\/\/www.topfastpcb.com\/fi\/pcb-manufacturing\/\">PCB-valmistus<\/a>, TG on yksi keskeisist\u00e4 parametreista, jotka m\u00e4\u00e4ritt\u00e4v\u00e4t piirilevyn k\u00e4ytt\u00e4ytymist\u00e4 l\u00e4mp\u00f6kuormituksen alaisena, erityisesti lyijytt\u00f6m\u00e4ss\u00e4 juottamisessa ja pitk\u00e4aikaisessa korkean l\u00e4mp\u00f6tilan k\u00e4yt\u00f6ss\u00e4.<\/p><p>Verrattuna tavalliseen FR4-materiaaliin korkean TG-arvon omaavat materiaalit tarjoavat paremman rakenteellisen vakauden, ja niit\u00e4 k\u00e4ytet\u00e4\u00e4n laajalti sovelluksissa, joissa l\u00e4mp\u00f6luotettavuus on ratkaisevan t\u00e4rke\u00e4\u00e4.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material.jpg\" alt=\"Korkean TG-arvon FR4-piirilevyaine\" class=\"wp-image-5894\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sis\u00e4llysluettelo<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#What_TG_Means_in_PCB_Materials\" >Mit\u00e4 TG tarkoittaa piirilevyjen materiaaleissa<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Standard_TG_vs_High_TG_FR4\" >Tavallinen TG vs. korkea TG FR4<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Standard_TG_FR4\" >Vakiomallinen TG FR4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Mid_TG_FR4\" >Keskitihe\u00e4 TG FR4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#High_TG_FR4\" >Korkean lasittumisl\u00e4mp\u00f6tilan FR4<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Why_High_TG_FR4_Matters_in_PCB_Manufacturing\" >Miksi korkean TG-arvon FR4-materiaali on t\u00e4rke\u00e4\u00e4 piirilevyjen valmistuksessa<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Electrical_and_Mechanical_Properties\" >S\u00e4hk\u00f6iset ja mekaaniset ominaisuudet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Where_High_TG_FR4_Is_Used\" >Miss\u00e4 korkean TG-arvon FR4-materiaalia k\u00e4ytet\u00e4\u00e4n<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Automotive_Electronics\" >Autoteollisuuden elektroniikka<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Power_Electronics\" >Tehoelektroniikka<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Communication_Systems\" >Viestint\u00e4j\u00e4rjestelm\u00e4t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Server_and_Data_Systems\" >Palvelin- ja tietoj\u00e4rjestelm\u00e4t<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Manufacturing_Considerations\" >Valmistukseen liittyv\u00e4t seikat<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Drilling_and_Via_Reliability\" >Poraus ja l\u00e4pivientien luotettavuus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Lamination_Process\" >Laminointiprosessi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Reflow_Resistance\" >Uudelleenvirtauksen kest\u00e4vyys<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#High_TG_FR4_vs_Standard_FR4\" >Korkean TG-arvon FR4 vs. tavallinen FR4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Limitations_of_High_TG_FR4\" >Korkean TG-arvon omaavan FR4-materiaalin rajoitukset<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Material_Selection_Strategy\" >Materiaalivalintastrategia<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#Common_High_TG_FR4_Suppliers\" >Tavallisimmat korkean TG-arvon FR4-toimittajat<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_TG_Means_in_PCB_Materials\"><\/span>Mit\u00e4 TG tarkoittaa piirilevyjen materiaaleissa<span class=\"ez-toc-section-end\"><\/span><\/h2><p>TG (lasittumisl\u00e4mp\u00f6tila) on piste, jossa epoksihartsi alkaa siirty\u00e4 j\u00e4yk\u00e4st\u00e4, lasimaisesta tilasta pehme\u00e4mp\u00e4\u00e4n, kumimaiseen tilaan.<\/p><p>TG:n alapuolella materiaali pysyy vakaana ja mekaanisesti lujana. TG:n yl\u00e4puolella materiaali alkaa laajentua nopeammin ja menett\u00e4\u00e4 j\u00e4ykkyytt\u00e4\u00e4n.<\/p><p>Piirilevyjen suunnittelussa t\u00e4m\u00e4 vaikuttaa suoraan seuraaviin seikkoihin:<\/p><ul class=\"wp-block-list\"><li>Muodonpysyvyys<\/li>\n\n<li>Luotettavuuden kautta<\/li>\n\n<li>Kerroksen kohdistaminen<\/li>\n\n<li>Pitk\u00e4aikainen mekaaninen lujuus<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Standard_TG_vs_High_TG_FR4\"><\/span>Tavallinen TG vs. korkea TG FR4<span class=\"ez-toc-section-end\"><\/span><\/h2><p>FR4-materiaalit jaetaan yleens\u00e4 kolmeen luokkaan:<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Standard_TG_FR4\"><\/span>Vakiomallinen TG FR4<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>TG noin 130\u2013140 \u00b0C<\/li>\n\n<li>Soveltuu yleiseen elektroniikkaan<\/li>\n\n<li>Yleist\u00e4 edullisissa kuluttajatuotteissa<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mid_TG_FR4\"><\/span>Keskitihe\u00e4 TG FR4<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>TG noin 150\u2013160 \u00b0C<\/li>\n\n<li>Tasapainoinen suorituskyky ja kustannukset<\/li>\n\n<li>K\u00e4ytet\u00e4\u00e4n teollisuuselektroniikassa<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_TG_FR4\"><\/span>Korkean lasittumisl\u00e4mp\u00f6tilan FR4<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>TG \u2265 170 \u00b0C<\/li>\n\n<li>Suunniteltu ymp\u00e4rist\u00f6ihin, joissa l\u00e4mp\u00f6kuormitus on suuri<\/li>\n\n<li>Yleinen eritt\u00e4in luotettavuutta vaativissa sovelluksissa<\/li><\/ul><p>Korkean TG-arvon omaavat materiaalit s\u00e4ilytt\u00e4v\u00e4t rakenteellisen eheytens\u00e4 useiden reflow-kierrosten aikana, mink\u00e4 ansiosta ne soveltuvat nykyaikaisiin SMT-prosesseihin.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_High_TG_FR4_Matters_in_PCB_Manufacturing\"><\/span>Miksi korkean TG-arvon FR4-materiaali on t\u00e4rke\u00e4\u00e4 piirilevyjen valmistuksessa<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Piirilevykokoonpanojen monimutkaistumisen my\u00f6t\u00e4 tuotannon ja k\u00e4yt\u00f6n aikana syntyv\u00e4 l\u00e4mp\u00f6rasitus on kasvanut merkitt\u00e4v\u00e4sti.<\/p><p>Korkean TG-arvon omaavat materiaalit auttavat v\u00e4hent\u00e4m\u00e4\u00e4n:<\/p><ul class=\"wp-block-list\"><li>Hartsin hajoaminen juottamisen aikana<\/li>\n\n<li>Delaminaatioriskit<\/li>\n\n<li>Via cracking<\/li>\n\n<li>Monikerroksisten rakenteiden v\u00e4\u00e4ntyminen<\/li><\/ul><p>Ne parantavat my\u00f6s pitk\u00e4aikaista luotettavuutta vaativissa olosuhteissa.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Electrical_and_Mechanical_Properties\"><\/span>S\u00e4hk\u00f6iset ja mekaaniset ominaisuudet<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Korkean TG-arvon omaava FR4 s\u00e4ilytt\u00e4\u00e4 yleens\u00e4 samanlaiset s\u00e4hk\u00f6iset ominaisuudet kuin tavallinen FR4, mutta sen l\u00e4mp\u00f6k\u00e4ytt\u00e4ytyminen on parempi.<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Kiinteist\u00f6<\/th><th>Tyypillinen kantama<\/th><\/tr><tr><td>TG<\/td><td>\u2265170 \u00b0C<\/td><\/tr><tr><td>Dielektrisyysvakio (Dk)<\/td><td>4.2\u20134.7<\/td><\/tr><tr><td>H\u00e4vi\u00f6kerroin (Df)<\/td><td>0,015\u20130,020<\/td><\/tr><tr><td>L\u00e4mp\u00f6laajeneminen (Z-akseli)<\/td><td>Alhaisempi kuin tavanomaisessa FR4-materiaalissa<\/td><\/tr><tr><td>Hajoamisl\u00e4mp\u00f6tila<\/td><td>~300 \u00b0C<\/td><\/tr><\/tbody><\/table><\/figure><p>T\u00e4rkein parannus on Z-akselin laajenemisen v\u00e4hent\u00e4minen, mik\u00e4 vaikuttaa suoraan luotettavuuteen.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-1.jpg\" alt=\"Korkean TG-arvon FR4-piirilevyaine\" class=\"wp-image-5895\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_High_TG_FR4_Is_Used\"><\/span>Miss\u00e4 korkean TG-arvon FR4-materiaalia k\u00e4ytet\u00e4\u00e4n<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Korkean TG-arvon omaavaa FR4-materiaalia ei tarvita jokaiseen tuotteeseen, mutta siit\u00e4 tulee v\u00e4ltt\u00e4m\u00e4t\u00f6nt\u00e4, kun luotettavuusvaatimukset kiristyv\u00e4t tai l\u00e4mp\u00f6tila nousee.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Automotive_Electronics\"><\/span>Autoteollisuuden elektroniikka<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Nykyaikaiset ajoneuvot ovat suuresti riippuvaisia elektronisista ohjausj\u00e4rjestelmist\u00e4, jotka altistuvat korkeille l\u00e4mp\u00f6tiloille konepellin alla.<\/p><p>Sovelluksia ovat mm:<\/p><ul class=\"wp-block-list\"><li>Moottorin ohjausyksik\u00f6t (ECU)<\/li>\n\n<li>Ohjaustehostinj\u00e4rjestelm\u00e4t<\/li>\n\n<li>Akunhallintaj\u00e4rjestelm\u00e4t (BMS)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Power_Electronics\"><\/span>Tehoelektroniikka<span class=\"ez-toc-section-end\"><\/span><\/h3><p>TG-arvoltaan korkeita materiaaleja k\u00e4ytet\u00e4\u00e4n laajalti seuraavilla aloilla:<\/p><ul class=\"wp-block-list\"><li>Virtal\u00e4hteet<\/li>\n\n<li>Invertterit<\/li>\n\n<li>Teollisuuden tehomoduulit<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Communication_Systems\"><\/span>Viestint\u00e4j\u00e4rjestelm\u00e4t<span class=\"ez-toc-section-end\"><\/span><\/h3><p>K\u00e4ytt\u00f6kohteet:<\/p><ul class=\"wp-block-list\"><li>Tukiasemakortit<\/li>\n\n<li>Verkkoinfrastruktuurilaitteet<\/li>\n\n<li>Optiset moduulit<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Server_and_Data_Systems\"><\/span>Palvelin- ja tietoj\u00e4rjestelm\u00e4t<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Korkean TG-arvon omaavaa FR4-materiaalia k\u00e4ytet\u00e4\u00e4n yleisesti seuraavissa sovelluksissa:<\/p><ul class=\"wp-block-list\"><li>Palvelinten emolevyt<\/li>\n\n<li>Tallennusj\u00e4rjestelm\u00e4t<\/li>\n\n<li>Tihe\u00e4sti pakatut laskentakortit<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manufacturing_Considerations\"><\/span>Valmistukseen liittyv\u00e4t seikat<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Korkean TG-arvon omaavien materiaalien k\u00e4ytt\u00f6 vaikuttaa piirilevyjen valmistukseen monin tavoin.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Drilling_and_Via_Reliability\"><\/span>Poraus ja l\u00e4pivientien luotettavuus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Z-akselin alaosan laajenemisen v\u00e4hent\u00e4minen parantaa tynnyrin luotettavuutta l\u00e4mp\u00f6syklien aikana.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lamination_Process\"><\/span>Laminointiprosessi<span class=\"ez-toc-section-end\"><\/span><\/h3><p>TG-arvoltaan korkeat materiaalit vaativat usein:<\/p><ul class=\"wp-block-list\"><li>Suurempi laminointipaine<\/li>\n\n<li>Ohjatut l\u00e4mmitysprofiilit<\/li>\n\n<li>Tiukka hartsin virtauksen hallinta<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Reflow_Resistance\"><\/span>Uudelleenvirtauksen kest\u00e4vyys<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Piirilevyjen on kestett\u00e4v\u00e4 useita SMT-uudelleensulatusjaksoja ilman, ett\u00e4 niiss\u00e4 esiintyy delaminaatiota tai kuplien muodostumista.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_TG_FR4_vs_Standard_FR4\"><\/span>Korkean TG-arvon FR4 vs. tavallinen FR4<span class=\"ez-toc-section-end\"><\/span><\/h2><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Ominaisuus<\/td><td>Standardi FR4<\/td><td>Korkean lasittumisl\u00e4mp\u00f6tilan FR4<\/td><\/tr><tr><td>TG-arvo<\/td><td>130\u2013140 \u00b0C<\/td><td>\u2265170 \u00b0C<\/td><\/tr><tr><td>L\u00e4mp\u00f6stabiilisuus<\/td><td>Kohtalainen<\/td><td>Korkea<\/td><\/tr><tr><td>Kustannukset<\/td><td>Alempi<\/td><td>Hieman korkeampi<\/td><\/tr><tr><td>Luotettavuus<\/td><td>Yleisk\u00e4ytt\u00f6<\/td><td>Korkea luotettavuus<\/td><\/tr><tr><td>SMT-soveltuvuus<\/td><td>Basic<\/td><td>Edistyksellinen monivaiheinen uudelleenjuottaminen<\/td><\/tr><\/tbody><\/table><\/figure><p>Kustannusero on suhteellisen pieni verrattuna luotettavuuden parantumiseen.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Limitations_of_High_TG_FR4\"><\/span>Korkean TG-arvon omaavan FR4-materiaalin rajoitukset<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Vaikka korkea TG-arvo parantaa l\u00e4mp\u00f6ominaisuuksia, se perustuu silti epoksihartsij\u00e4rjestelmiin.<\/p><p>Rajoituksia ovat:<\/p><ul class=\"wp-block-list\"><li>Suurempi dielektrinen h\u00e4vi\u00f6 korkeilla taajuuksilla<\/li>\n\n<li>Ei sovellu mikroaaltosuunnitteluun<\/li>\n\n<li>Suorituskyky on rajoitettu yli useiden GHz:ien taajuuksilla<\/li>\n\n<li>L\u00e4mm\u00f6njohtavuus on edelleen suhteellisen alhainen<\/li><\/ul><p>RF- tai eritt\u00e4in nopeissa sovelluksissa suositellaan k\u00e4ytett\u00e4v\u00e4ksi v\u00e4h\u00e4h\u00e4vi\u00f6isi\u00e4 materiaaleja, kuten Rogersia tai Megtronia.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Material_Selection_Strategy\"><\/span>Materiaalivalintastrategia<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Todellisessa piirilevyjen suunnittelussa korkean TG-arvon omaava FR4 on usein \u201dkompromissiratkaisu\u201d.<\/p><p>Tyypillinen valintalogiikka on seuraava:<\/p><ul class=\"wp-block-list\"><li>Edullinen elektroniikka \u2192 Vakiomallinen FR4<\/li>\n\n<li>Teollisuus \/ autoteollisuus \u2192 Korkean TG-arvon FR4<\/li>\n\n<li>Suurnopeus \/ RF \u2192 Rogers tai PTFE<\/li>\n\n<li>Eritt\u00e4in nopeat takalevyt \u2192 Megtronin tai Isolan nopeat sarjat<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-2.jpg\" alt=\"Korkean TG-arvon FR4-piirilevyaine\" class=\"wp-image-5896\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/High-TG-FR4-PCB-Material-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_High_TG_FR4_Suppliers\"><\/span>Tavallisimmat korkean TG-arvon FR4-toimittajat<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Useat laminaattivalmistajat tarjoavat laajalti k\u00e4ytettyj\u00e4 materiaaleja, joilla on korkea TG-arvo:<\/p><ul class=\"wp-block-list\"><li>Shengyi<\/li>\n\n<li>Kingboard<\/li>\n\n<li>ITEQ<\/li>\n\n<li>Isola<\/li>\n\n<li>Ventec<\/li><\/ul><p>Jokainen toimittaja tarjoaa useita TG-laatuja erilaisiin suorituskyky- ja kustannusvaatimuksiin.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1782283350742\"><strong class=\"schema-faq-question\">K: Onko korkean TG-arvon FR4 aina parempi kuin tavallinen FR4?<\/strong> <p class=\"schema-faq-answer\">A: Ei aina. Korkea TG-arvo on tarpeen vain silloin, kun piirilevy altistuu suurelle l\u00e4mp\u00f6rasitukselle tai useille uudelleensulatusjaksoille.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782283361368\"><strong class=\"schema-faq-question\">K: Parantaako korkean TG-arvon omaava FR4-materiaali signaalin suorituskyky\u00e4?<\/strong> <p class=\"schema-faq-answer\">A: Ei merkitt\u00e4v\u00e4sti. Se parantaa l\u00e4hinn\u00e4 l\u00e4mp\u00f6- ja mekaanista luotettavuutta eik\u00e4 niink\u00e4\u00e4n korkeataajuista suorituskyky\u00e4.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782283520743\"><strong class=\"schema-faq-question\">K: Mik\u00e4 TG-arvo katsotaan korkeaksi TG-arvoksi?<\/strong> <p class=\"schema-faq-answer\">A: Yleens\u00e4 materiaalit, joiden TG-arvo on v\u00e4hint\u00e4\u00e4n 170 \u00b0C, luokitellaan korkean TG-arvon FR4-materiaaleiksi.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782283531090\"><strong class=\"schema-faq-question\">K: Onko korkean TG-arvon FR4-materiaali kalliimpaa?<\/strong> <p class=\"schema-faq-answer\">V: Kyll\u00e4, mutta hintaero on yleens\u00e4 kohtuullinen verrattuna tavalliseen FR4-materiaaliin.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782283586027\"><strong class=\"schema-faq-question\">K: Voidaanko korkean TG-arvon FR4-materiaalia k\u00e4ytt\u00e4\u00e4 nopeiden piirilevyjen suunnittelussa?<\/strong> <p class=\"schema-faq-answer\">A: Sit\u00e4 voidaan k\u00e4ytt\u00e4\u00e4 kohtuullisen suurinopeuksisissa sovelluksissa, mutta radiotaajuussignaaleissa tai eritt\u00e4in suurinopeuksisissa signaaleissa suositellaan h\u00e4vi\u00f6ilt\u00e4\u00e4n v\u00e4h\u00e4isi\u00e4 laminaatteja.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>Korkean TG-arvon FR4-materiaali on suunniteltu piirilevyk\u00e4ytt\u00f6\u00f6n, jossa vaaditaan parempaa l\u00e4mp\u00f6stabiilisuutta ja luotettavuutta. Se v\u00e4hent\u00e4\u00e4 v\u00e4\u00e4ntymist\u00e4, parantaa l\u00e4pivientien suorituskyky\u00e4 ja on laajalti k\u00e4yt\u00f6ss\u00e4 autoteollisuudessa, tehoelektroniikassa ja palvelinj\u00e4rjestelmiss\u00e4. RF- ja suurinopeuksisissa suunnittelukohteissa tarvitaan kuitenkin edelleen v\u00e4h\u00e4h\u00e4vi\u00f6isi\u00e4 materiaaleja.<\/p>","protected":false},"author":1,"featured_media":5897,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[483,484],"class_list":["post-5893","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-fr4-pcb","tag-pcb-material"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>High TG FR4 PCB Material Guide<\/title>\n<meta name=\"description\" content=\"Understand High TG FR4 PCB material, including glass transition temperature, thermal reliability, applications, and differences from standard FR4 in PCB manufacturing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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Is high TG FR4 always better than standard FR4?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: Not always. High TG is only necessary when the PCB is exposed to higher thermal stress or multiple reflow cycles.","inLanguage":"fi"},"inLanguage":"fi"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/high-tg-fr4-pcb\/#faq-question-1782283361368","position":2,"url":"https:\/\/www.topfastpcb.com\/blog\/high-tg-fr4-pcb\/#faq-question-1782283361368","name":"Q: Does high TG FR4 improve signal performance?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: Not significantly. It mainly improves thermal and mechanical reliability rather than high-frequency performance.","inLanguage":"fi"},"inLanguage":"fi"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/high-tg-fr4-pcb\/#faq-question-1782283520743","position":3,"url":"https:\/\/www.topfastpcb.com\/blog\/high-tg-fr4-pcb\/#faq-question-1782283520743","name":"Q: What TG value is considered high TG?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: Typically, materials with TG \u2265 170\u00b0C are classified as high TG FR4.","inLanguage":"fi"},"inLanguage":"fi"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/high-tg-fr4-pcb\/#faq-question-1782283531090","position":4,"url":"https:\/\/www.topfastpcb.com\/blog\/high-tg-fr4-pcb\/#faq-question-1782283531090","name":"Q: Is high TG FR4 more expensive?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: Yes, but the cost difference is usually moderate compared to standard FR4.","inLanguage":"fi"},"inLanguage":"fi"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/high-tg-fr4-pcb\/#faq-question-1782283586027","position":5,"url":"https:\/\/www.topfastpcb.com\/blog\/high-tg-fr4-pcb\/#faq-question-1782283586027","name":"Q: Can high TG FR4 be used in high-speed PCB design?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: It can be used for moderate high-speed applications, but for RF or very high-speed signals, low-loss laminates are preferred.","inLanguage":"fi"},"inLanguage":"fi"}]}},"_links":{"self":[{"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/posts\/5893","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/comments?post=5893"}],"version-history":[{"count":1,"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/posts\/5893\/revisions"}],"predecessor-version":[{"id":5898,"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/posts\/5893\/revisions\/5898"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/media\/5897"}],"wp:attachment":[{"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/media?parent=5893"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/categories?post=5893"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.topfastpcb.com\/fi\/wp-json\/wp\/v2\/tags?post=5893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}