{"id":3616,"date":"2025-10-14T06:25:30","date_gmt":"2025-10-14T06:25:30","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=3616"},"modified":"2025-10-17T05:38:14","modified_gmt":"2025-10-17T05:38:14","slug":"how-should-pcb-circuit-boards-be-laid-out","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/fi\/how-should-pcb-circuit-boards-be-laid-out\/","title":{"rendered":"Miten PCB-piirilevyt tulisi laatia?"},"content":{"rendered":"<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">PCB-komponentin asettelun periaatteet<\/h2>\n\n\n\n<p>Osoitteessa <a href=\"https:\/\/flj-pcb.com\/fi\/pcb-design\/\" data-type=\"page\" data-id=\"3488\">PCB:n ulkoasun suunnittelu<\/a>, komponenttien sijoittelu on ratkaisevan t\u00e4rke\u00e4\u00e4. Se vaikuttaa siihen, kuinka siistilt\u00e4 levy n\u00e4ytt\u00e4\u00e4 ja kuinka pitki\u00e4 ja montaa painettua j\u00e4lke\u00e4 siin\u00e4 on. Se vaikuttaa my\u00f6s laitteen yleiseen luotettavuuteen. Seuraavassa on useita peruss\u00e4\u00e4nt\u00f6j\u00e4, joita piirilevykomponenttien sijoittelun tulisi noudattaa.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tasainen ja johdonmukainen jakelu<\/h3>\n\n\n\n<p>Aseta komponentit niin, ett\u00e4 ne jakautuvat tasaisesti koko levylle. Pid\u00e4 tiheys ja v\u00e4lit yhten\u00e4isin\u00e4. \u00c4l\u00e4 anna komponenttien t\u00e4ytt\u00e4\u00e4 levy\u00e4 kokonaan. J\u00e4t\u00e4 hieman tilaa levyn reunoille. Se, kuinka suuri tyhj\u00e4n marginaalin tulisi olla, riippuu levyn pinta-alasta ja siit\u00e4, miten levy on kiinnitetty tuotteeseen. Aivan piirilevyn reunaan istuvien komponenttien tulisi olla v\u00e4hint\u00e4\u00e4n 3 mm:n p\u00e4\u00e4ss\u00e4 piirilevyn reunasta. Elektroniikkalaitteissa on tavallista j\u00e4tt\u00e4\u00e4 5-10 mm tilaa kummallekin reunalle.<\/p>\n\n\n\n<p>Yleisesti ottaen kannattaa komponentit sijoittaa piirilevyn yhdelle puolelle, kun se on mahdollista. Komponentin jokaisen johtimen johtimen tulisi k\u00e4ytt\u00e4\u00e4 omaa juotosalustaa.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"700\" height=\"245\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-layout.webp\" alt=\"Component layout\" class=\"wp-image-4013\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-layout.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-layout-300x105.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Ei p\u00e4\u00e4llekk\u00e4isyytt\u00e4 ja riitt\u00e4v\u00e4 vapaa tila<\/h3>\n\n\n\n<p>Komponentit eiv\u00e4t saa olla p\u00e4\u00e4llekk\u00e4in ylh\u00e4\u00e4lt\u00e4 alasp\u00e4in siten, ett\u00e4 ne menev\u00e4t ristiin. Pid\u00e4 riitt\u00e4v\u00e4 v\u00e4li vierekk\u00e4isten komponenttien v\u00e4lill\u00e4. V\u00e4li ei saa olla liian pieni fyysisen kosketuksen v\u00e4ltt\u00e4miseksi. Jos kahdella l\u00e4hekk\u00e4isell\u00e4 komponentilla on suuri potentiaaliero, pid\u00e4 niiden v\u00e4lill\u00e4 turvallinen et\u00e4isyys. Tavallisissa ymp\u00e4rist\u00f6iss\u00e4 turvallinen ilmav\u00e4li on noin 200 V\/mm. Toisin sanoen, jos odotat suuria j\u00e4nnite-eroja, lis\u00e4\u00e4 v\u00e4limatkaa.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"350\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-placement-direction.webp\" alt=\"Component placement direction\" class=\"wp-image-4015\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-placement-direction.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-placement-direction-300x150.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Matala asennuskorkeus<\/h3>\n\n\n\n<p>Tee komponenttien asennuskorkeus mahdollisimman matalaksi. Komponentin johto ei saisi nousta yli 5 mm:n korkeudelle levyst\u00e4. Jos osat istuvat liian korkealla, ne kest\u00e4v\u00e4t huonosti t\u00e4rin\u00e4\u00e4 ja iskuja. Korkeat osat voivat kallistua, kaatua tai koskettaa viereisi\u00e4 komponentteja. T\u00e4m\u00e4 heikent\u00e4\u00e4 luotettavuutta.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"245\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Assembly.webp\" alt=\"Component Assembly\" class=\"wp-image-4012\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Assembly.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Assembly-300x105.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Akselin suunta ja s\u00e4\u00e4nn\u00f6llisyys<\/h3>\n\n\n\n<p>P\u00e4\u00e4t\u00e4 komponenttien akselien suunnat sen mukaan, miten piirilevy istuu ja kiinnitet\u00e4\u00e4n lopulliseen tuotteeseen. S\u00e4\u00e4nn\u00f6llisi\u00e4 komponenttiryhmi\u00e4 varten kohdista suurten osien akselit siten, ett\u00e4 ne ovat pystysuorassa tuotteeseen n\u00e4hden. T\u00e4m\u00e4 parantaa piirilevyn mekaanista vakautta. Akselien kohdistaminen auttaa pit\u00e4m\u00e4\u00e4n osat paikoillaan t\u00e4rin\u00e4ss\u00e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pad-v\u00e4li ja Lead Bends<\/h3>\n\n\n\n<p>Komponentin molemmissa p\u00e4iss\u00e4 olevien tyynyjen on oltava hieman leve\u00e4mm\u00e4ll\u00e4 et\u00e4isyydell\u00e4 toisistaan kuin komponentin aksiaalinen runkopituus. Kun taivutat johtoja, \u00e4l\u00e4 taivuta suoraan juuresta. J\u00e4t\u00e4 jonkin verran suoraa johtimen pituutta ennen taivutusta - v\u00e4hint\u00e4\u00e4n 2 mm - jotta runko ei vahingoitu. T\u00e4m\u00e4 v\u00e4hent\u00e4\u00e4 komponentin johtoon ja juotosliitokseen kohdistuvaa rasitusta.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Miten komponentit asennetaan ja kiinnitet\u00e4\u00e4n PCB:hen<\/h2>\n\n\n\n<p>Piirilevyn komponenttien kiinnitystyylej\u00e4 on kaksi: pystysuora (pystyasennossa) ja vaakasuora (makuuasennossa). Vaakasuora tarkoittaa, ett\u00e4 komponentin akseli on yhdensuuntainen piirilevyn pinnan kanssa. Pystysuora tarkoittaa, ett\u00e4 akseli on kohtisuorassa. Molemmilla menetelmill\u00e4 on hyv\u00e4t ja huonot puolensa. K\u00e4yt\u00e4 niit\u00e4 joustavasti suunnitellessasi. Voit k\u00e4ytt\u00e4\u00e4 yht\u00e4 tyyli\u00e4 tai molempien yhdistelm\u00e4\u00e4. Varmista, ett\u00e4 piiri kest\u00e4\u00e4 t\u00e4rin\u00e4\u00e4, sit\u00e4 on helppo huoltaa ja komponenttien asettelu on tasainen. T\u00e4m\u00e4 auttaa my\u00f6s j\u00e4lkien reitityksess\u00e4.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"245\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Mounting-Methods.webp\" alt=\"Component Mounting Methods\" class=\"wp-image-4014\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Mounting-Methods.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Component-Mounting-Methods-300x105.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Pystysuora (pystysuora) asennus<\/h3>\n\n\n\n<p>Pystysuoraan asennetut komponentit viev\u00e4t v\u00e4hemm\u00e4n levyn pinta-alaa. Voit asentaa enemm\u00e4n osia pinta-alayksikk\u00f6\u00e4 kohti. T\u00e4m\u00e4 on hyv\u00e4 ratkaisu tihe\u00e4ss\u00e4 tuotesuunnittelussa, kuten kannettavien radioiden ja kuulokojeiden suunnittelussa. Monissa pieniss\u00e4 kannettavissa laitteissa k\u00e4ytet\u00e4\u00e4n pystyasennusta.<\/p>\n\n\n\n<p>Pystysuorien osien on kuitenkin oltava pieni\u00e4 ja kevyit\u00e4. Suuret tai painavat osat eiv\u00e4t sovellu pystyasennukseen. Raskaat osat v\u00e4hent\u00e4v\u00e4t mekaanista lujuutta ja heikent\u00e4v\u00e4t t\u00e4rin\u00e4nkest\u00e4vyytt\u00e4. Ne voivat kallistua tai pudota ja koskettaa muita osia, mik\u00e4 aiheuttaa luotettavuusongelmia.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vaakasuora (makuuasennossa) asennus<\/h3>\n\n\n\n<p>Vaakasuora asennus antaa paremman mekaanisen vakauden. Se saa levyn n\u00e4ytt\u00e4m\u00e4\u00e4n siistimm\u00e4lt\u00e4. Vaaka-asennus lis\u00e4\u00e4 komponenttien v\u00e4limatkaa juotospintojen v\u00e4lill\u00e4, mik\u00e4 helpottaa johtimen reititt\u00e4mist\u00e4 kahden juotospisteen v\u00e4lill\u00e4. T\u00e4m\u00e4 on hy\u00f6dyllist\u00e4 j\u00e4ljen asettelussa. Vaaka-asennusta suositaan yleens\u00e4 silloin, kun mekaaninen vakaus ja reitityksen helppous ovat t\u00e4rkeit\u00e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">PCB-komponentin j\u00e4rjestelyformaatit<\/h2>\n\n\n\n<p>Komponentit on sijoitettava tasaisesti, siististi ja tiiviisti levylle. Pyri v\u00e4hent\u00e4m\u00e4\u00e4n ja lyhent\u00e4m\u00e4\u00e4n piirikokonaisuuksien ja yksitt\u00e4isten komponenttien v\u00e4lisi\u00e4 yhteyksi\u00e4. Piirilevyll\u00e4 on kaksi p\u00e4\u00e4asiallista asettelumuotoa: ep\u00e4s\u00e4\u00e4nn\u00f6llinen sijoittelu ja s\u00e4\u00e4nn\u00f6llinen sijoittelu. Voit k\u00e4ytt\u00e4\u00e4 jompaakumpaa yksin tai molempia yhdess\u00e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ep\u00e4s\u00e4\u00e4nn\u00f6llinen sijoittelu<\/h3>\n\n\n\n<p>Ep\u00e4s\u00e4\u00e4nn\u00f6llisess\u00e4 sijoittelussa komponenttien akselit eiv\u00e4t ole samassa linjassa eiv\u00e4tk\u00e4 niiden sijainnit noudata tiukkoja s\u00e4\u00e4nt\u00f6j\u00e4. T\u00e4m\u00e4 n\u00e4ytt\u00e4\u00e4 ep\u00e4s\u00e4\u00e4nn\u00f6lliselt\u00e4, mutta se vapauttaa komponenttien suuntauksen ja sijainnin. T\u00e4m\u00e4 vapaus helpottaa usein j\u00e4ljen asettelua. Se voi lyhent\u00e4\u00e4 tai v\u00e4hent\u00e4\u00e4 kytkent\u00f6j\u00e4, mik\u00e4 pienent\u00e4\u00e4 huomattavasti j\u00e4ljen kokonaispituutta. Lyhyemm\u00e4t j\u00e4ljet pienent\u00e4v\u00e4t loisparametrej\u00e4 ja auttavat v\u00e4hent\u00e4m\u00e4\u00e4n h\u00e4iri\u00f6it\u00e4. Ep\u00e4s\u00e4\u00e4nn\u00f6llinen sijoittelu on eritt\u00e4in hy\u00f6dyllist\u00e4 suurtaajuuspiireiss\u00e4. Sit\u00e4 k\u00e4ytet\u00e4\u00e4n usein pystysuoraan asennettujen komponenttien kanssa.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"280\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Irregular-Component-Arrangement.webp\" alt=\"Irregular Component Arrangement\" class=\"wp-image-4017\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Irregular-Component-Arrangement.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Irregular-Component-Arrangement-300x120.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">S\u00e4\u00e4nn\u00f6llinen sijoittaminen<\/h3>\n\n\n\n<p>S\u00e4\u00e4nn\u00f6llinen sijoittelu kohdistaa komponenttien akselit siten, ett\u00e4 ne ovat yhdensuuntaisia tai kohtisuorassa levyn reunoihin n\u00e4hden. Korkeataajuusosia lukuun ottamatta useimmissa elektroniikkatuotteissa komponentit on pyritt\u00e4v\u00e4 sijoittamaan joko yhdensuuntaisesti tai kohtisuoraan. T\u00e4m\u00e4 p\u00e4tee erityisesti silloin, kun komponentit asennetaan vaakasuoraan. S\u00e4\u00e4nn\u00f6llinen sijoittelu parantaa levyn ulkon\u00e4k\u00f6\u00e4 ja helpottaa kokoonpanoa, juottamista ja virheenkorjausta. Se on my\u00f6s helpompaa tuotannon ja huollon kannalta.<\/p>\n\n\n\n<p>S\u00e4\u00e4nn\u00f6llinen sijoittelu on ihanteellinen matalataajuuspiireille, joissa on kohtalaisia komponenttityyppej\u00e4 mutta suuria m\u00e4\u00e4ri\u00e4. Monet instrumentit k\u00e4ytt\u00e4v\u00e4t t\u00e4t\u00e4 muotoa. S\u00e4\u00e4nn\u00f6llinen sijoittelu asettaa kuitenkin sijaintia ja suuntaa koskevia rajoituksia. J\u00e4ljen reitityksest\u00e4 voi tulla monimutkaisempaa, ja sen seurauksena j\u00e4ljen kokonaispituus voi kasvaa.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Komponenttityynyjen sijoittaminen piirilevyyn<\/h2>\n\n\n\n<p>Komponentin jokaisen johdon on oltava piirilevyn juotosalustalla. Padin sijainti riippuu komponentin koosta ja siit\u00e4, miten se on kiinnitetty. Pystyasennuksessa tai ep\u00e4s\u00e4\u00e4nn\u00f6llisess\u00e4 sijoittelussa komponenttien koko ja et\u00e4isyys toisistaan voivat rajoittaa padin sijaintia v\u00e4hemm\u00e4n. S\u00e4\u00e4nn\u00f6llisess\u00e4 sijoittelussa on noudatettava tiettyj\u00e4 standardeja.<\/p>\n\n\n\n<p>Mink\u00e4\u00e4n menetelm\u00e4n yhteydess\u00e4 tyynyn keskipisteiden (eli p\u00e4\u00e4llystetyn rei\u00e4n keskipisteen) ei pit\u00e4isi olla liian l\u00e4hell\u00e4 levyn reunaa. Tyypillinen et\u00e4isyys on v\u00e4hint\u00e4\u00e4n 2,5 mm. Ainakin padin keskipisteen tulisi olla suurempi kuin levyn paksuus et\u00e4isyydell\u00e4 reunasta.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"350\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Standard-Coordinate-Grid.webp\" alt=\"Standard Coordinate Grid\" class=\"wp-image-4018\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Standard-Coordinate-Grid.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Standard-Coordinate-Grid-300x150.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p>Alustan sijainnin olisi mieluiten sijaittava vakiokoordinaattiruudukossa.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.utmel.com\/blog\/categories\/pcb\/introduction-to-pcb-layout-principles\" target=\"_blank\" rel=\"noopener\">IEC-standardissa<\/a>, perusritil\u00e4v\u00e4li on 2,54 mm (kotimainen standardi on 2,5 mm). Alaruutujen jako on 1,27 mm tai 0,635 mil (1,25 mm tai 0,625 mil). N\u00e4ill\u00e4 ruudukkostandardeilla on merkityst\u00e4, kun k\u00e4ytet\u00e4\u00e4n tietokoneavusteista suunnittelua, automaattista porausta tai automaattista komponenttien sijoittelua ja juottamista. Manuaalisessa porauksessa, lukuun ottamatta kahden IC-piirin pin-v\u00e4li\u00e4, voit lievent\u00e4\u00e4 ruudukon tiukkaa noudattamista. Silti tikkujen sijainnin pit\u00e4isi silti pit\u00e4\u00e4 komponentit siistein\u00e4 ja johdonmukaisina. Jos osat ovat samankokoisia, yrit\u00e4 pit\u00e4\u00e4 tyynyjen et\u00e4isyydet yhten\u00e4isin\u00e4. Padien keskiv\u00e4li ei saisi olla pienempi kuin levyn paksuus. T\u00e4m\u00e4 pit\u00e4\u00e4 asiat siistein\u00e4 ja helpottaa kokoonpanoa ja johtojen taivuttamista.<\/p>\n\n\n\n<p>Siisteys on tietysti suhteellista. K\u00e4yt\u00e4 erityistapauksissa harkintaa.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"280\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Flexibility-in-Component-Arrangement.webp\" alt=\"Flexibility in Component Arrangement\" class=\"wp-image-4016\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Flexibility-in-Component-Arrangement.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/10\/Flexibility-in-Component-Arrangement-300x120.webp 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">PCB-asetteluun vaikuttavat tekij\u00e4t<\/h2>\n\n\n\n<p>Monet tekij\u00e4t vaikuttavat hyv\u00e4\u00e4n piirilevyn ulkoasuun. T\u00e4ss\u00e4 k\u00e4sitell\u00e4\u00e4n t\u00e4rkeimpi\u00e4 niist\u00e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Signaalin virtaussuunta<\/h3>\n\n\n\n<p>Kun j\u00e4rjest\u00e4t piiriyksik\u00f6it\u00e4 levylle, jaa koko piiri toiminnon mukaan. Sijoita toiminnalliset moduulit signaalivirran mukaisessa j\u00e4rjestyksess\u00e4. T\u00e4m\u00e4 tekee asettelusta k\u00e4tev\u00e4n signaalireittien kannalta. Pyri pit\u00e4m\u00e4\u00e4n signaalien suunnat yhdenmukaisina. J\u00e4rjest\u00e4 signaalivirta useimmiten vasemmalta oikealle (tulo vasemmalla, l\u00e4ht\u00f6 oikealla) tai ylh\u00e4\u00e4lt\u00e4 alas (tulo ylh\u00e4\u00e4ll\u00e4, l\u00e4ht\u00f6 alhaalla).<\/p>\n\n\n\n<p>Sijoita komponentit, jotka liitet\u00e4\u00e4n suoraan tulo- ja l\u00e4ht\u00f6liittimiin, n\u00e4iden liittimien l\u00e4helle. Asettele kunkin toiminnallisen lohkon ydinlaitteen ymp\u00e4rille. K\u00e4yt\u00e4 esimerkiksi transistoria tai IC:t\u00e4 ytimen\u00e4 ja sijoita sitten siihen liittyv\u00e4t komponentit sen ymp\u00e4rille. Ota huomioon osan muoto, koko, napaisuus ja nastojen m\u00e4\u00e4r\u00e4. S\u00e4\u00e4d\u00e4 asentoa ja suuntausta johdotuksen lyhent\u00e4miseksi.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Erityiskomponenttien sijainti<\/h3>\n\n\n\n<p>H\u00e4iri\u00f6t elektronisissa laitteissa voivat olla per\u00e4isin monista l\u00e4hteist\u00e4: s\u00e4hk\u00f6isist\u00e4, magneettisista, termisist\u00e4 ja mekaanisista. Kun suunnittelet piirilevyn asettelua, analysoi ensin piirikaavio. Tunnista ensin erityiskomponentit ja sijoita sitten muut osat. N\u00e4in v\u00e4lt\u00e4t h\u00e4iri\u00f6t ja ryhdyt toimiin niiden v\u00e4hent\u00e4miseksi mahdollisimman paljon.<\/p>\n\n\n\n<p>Erityiskomponentit ovat sellaisia, jotka vaikuttavat laitteeseen s\u00e4hk\u00f6isesti, magneettisesti, termisesti tai mekaanisesti. Ne voivat olla my\u00f6s osia, jotka on kiinnitett\u00e4v\u00e4 tiettyihin paikkoihin toiminnan vaatimusten vuoksi.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">S\u00e4hk\u00f6magneettisten h\u00e4iri\u00f6iden (EMI) est\u00e4minen<\/h3>\n\n\n\n<p>S\u00e4hk\u00f6magneettista h\u00e4iri\u00f6t\u00e4 esiintyy usein toimivissa laitteissa. Syit\u00e4 ovat ulkoiset s\u00e4hk\u00f6magneettiset aallot ja huono reititys tai komponenttien huono sijoittelu piirilevyll\u00e4. Monet h\u00e4iri\u00f6ongelmat voidaan v\u00e4ltt\u00e4\u00e4 asetteluvaiheessa. Jos t\u00e4m\u00e4 j\u00e4tet\u00e4\u00e4n huomiotta jo varhaisessa vaiheessa, suunnittelu voi ep\u00e4onnistua.<\/p>\n\n\n\n<p>Erottele tai suojaa osat, jotka voivat vaikuttaa toisiinsa. Lyhenn\u00e4 liit\u00e4nt\u00f6j\u00e4 korkeataajuisissa osissa hajautettujen parametrien ja keskin\u00e4isen s\u00e4hk\u00f6magneettisen kytkenn\u00e4n v\u00e4hent\u00e4miseksi. Jos aiot k\u00e4ytt\u00e4\u00e4 metallisia suojapurkkeja RF-osissa, j\u00e4t\u00e4 piirilevyn alue suojakokoa varten.<\/p>\n\n\n\n<p>Herk\u00e4t osat eiv\u00e4t saa olla liian l\u00e4hell\u00e4 meluisia osia. Korkeaj\u00e4nnitteiset (esim. 220 V) ja matalaj\u00e4nnitteiset osat on erotettava toisistaan, ja tulo- ja l\u00e4ht\u00f6vaiheet on erotettava toisistaan. Jos tasavirtajohdot ovat pitki\u00e4, lis\u00e4\u00e4 suodatusosia 50 Hz:n kohinan pys\u00e4ytt\u00e4miseksi.<\/p>\n\n\n\n<p>Jos joillakin komponenteilla tai j\u00e4ljill\u00e4 voi olla suuria potentiaalieroja, suurenna v\u00e4lej\u00e4, jotta v\u00e4ltet\u00e4\u00e4n purkautuminen tai hajoaminen. V\u00e4lt\u00e4 metallikoteloitujen osien koskettamista toisiinsa. Esimerkiksi NPN-transistorin metallikotelo tai tehotransistorin j\u00e4\u00e4hdytyselementti voi olla kytkettyn\u00e4 kollektoriin, joka voi olla korkeassa potentiaalissa. Elektrolyyttikondensaattorikotelot ovat usein negatiivisella potentiaalilla tai maassa. Jos n\u00e4it\u00e4 metallikoteloita ei ole eristetty, varmista riitt\u00e4v\u00e4 et\u00e4isyys tai lis\u00e4\u00e4 eristyst\u00e4, muuten voi synty\u00e4 oikosulku.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u00e4mp\u00f6h\u00e4iri\u00f6iden hallinta<\/h3>\n\n\n\n<p>My\u00f6s l\u00e4mp\u00f6tilan nousu aiheuttaa h\u00e4iri\u00f6it\u00e4. Tunnista asettelussa, mitk\u00e4 osat tuottavat l\u00e4mp\u00f6\u00e4 ja mitk\u00e4 ovat l\u00e4mp\u00f6tilaherkki\u00e4.<\/p>\n\n\n\n<p>Sijoita l\u00e4mp\u00f6\u00e4 tuottavat osat, kuten suuritehoiset vastukset, l\u00e4helle koteloa tai sellaiseen paikkaan, jossa on hyv\u00e4 ilmavirtaus. K\u00e4yt\u00e4 tuuletusaukkoja j\u00e4\u00e4hdytyksen helpottamiseksi. \u00c4l\u00e4 ryhmittele l\u00e4mp\u00f6\u00e4 tuottavia osia yhteen. Harkitse j\u00e4\u00e4hdytyslevyj\u00e4 tai pientuuletinta, jotta l\u00e4mp\u00f6tilan nousu pysyy rajoissa. Suuret teho-osat voidaan ankkuroida runkoon, jotta metallikuori voidaan k\u00e4ytt\u00e4\u00e4 l\u00e4mm\u00f6npoistoon. Jos niiden on oltava piirilevyll\u00e4, anna niille suuret j\u00e4\u00e4hdytyselementit ja pid\u00e4 ne erill\u00e4\u00e4n muista osista.<\/p>\n\n\n\n<p>L\u00e4mp\u00f6tilaherk\u00e4t osat, kuten transistorit, IC:t ja suuret elektrolyyttikondensaattorit, eiv\u00e4t saisi olla l\u00e4hell\u00e4 l\u00e4mm\u00f6nl\u00e4hteit\u00e4 tai laitteen yl\u00e4osassa, jossa l\u00e4mp\u00f6tila nousee enemm\u00e4n. Pitk\u00e4aikainen kuumeneminen muuttaa toimintapisteit\u00e4 ja voi heikent\u00e4\u00e4 suorituskyky\u00e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mekaanista lujuutta koskevat n\u00e4k\u00f6kohdat<\/h3>\n\n\n\n<p>Huolehdi laudan tasapainosta ja vakaudesta. \u00c4l\u00e4 luota isojen ja painavien osien (tehomuuntajat, suuret elektrolyyttikondensaattorit, tehotransistorit j\u00e4\u00e4hdytyslevyineen) osalta pelk\u00e4st\u00e4\u00e4n piirilevyn juotosliitoksiin. Asenna ne mahdollisuuksien mukaan alustaan, jotta painopiste on matalalla ja tuote on vakaa. Suuret komponentit voivat v\u00e4\u00e4nt\u00e4\u00e4 piirilevy\u00e4 tai vahingoittaa muita komponentteja ja liittimi\u00e4.<\/p>\n\n\n\n<p>Jos komponentti painaa yli 15 grammaa ja sen on oltava piirilevyll\u00e4, \u00e4l\u00e4 luota pelk\u00e4st\u00e4\u00e4n juotoksiin. K\u00e4yt\u00e4 kiinnikkeit\u00e4, puristimia tai muita mekaanisia tukia.<\/p>\n\n\n\n<p>Kun levyt ovat suurempia kuin noin 200 mm \u00d7 150 mm, levyyn kohdistuu taivutus- ja t\u00e4rin\u00e4rasitusta. Lis\u00e4\u00e4 mekaaninen kehys tai j\u00e4ykiste muodonmuutosten est\u00e4miseksi. J\u00e4t\u00e4 tilaa kiinnityskannattimille, paikoitusruuveille ja liittimien kiinnityksille.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Huoltokelpoisuus ja saavutettavuus<\/h3>\n\n\n\n<p>Jos kyseess\u00e4 ovat s\u00e4\u00e4dett\u00e4v\u00e4t osat, kuten potentiometrit, muuttuvat kondensaattorit tai viritysk\u00e4\u00e4mit, mieti, miten tuotetta s\u00e4\u00e4det\u00e4\u00e4n. Jos s\u00e4\u00e4t\u00f6 tapahtuu ulkopuolelta, sovita osan asento etupaneelissa olevaan nuppiin. Jos s\u00e4\u00e4t\u00f6 on sis\u00e4inen, sijoita komponentti niin, ett\u00e4 se on helposti saatavilla piirilevyll\u00e4.<\/p>\n\n\n\n<p>Sijoita korkeaj\u00e4nnitteiset osat niin, ett\u00e4 k\u00e4det eiv\u00e4t todenn\u00e4k\u00f6isesti kosketa niihin, jotta vianm\u00e4\u00e4ritys ja huolto olisi turvallista. Sijoita esimerkiksi kuvaputkien korkeaj\u00e4nnitekomponentit sellaiseen paikkaan, josta niihin on vaikea p\u00e4\u00e4st\u00e4 k\u00e4siksi.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Yhteenveto PCB-asettelusta<\/h2>\n\n\n\n<p>Layout on PCB-suunnittelun t\u00e4rkein osa. Osien oikea j\u00e4rjest\u00e4minen kiinte\u00e4lle levyn alueelle on ensimm\u00e4inen vaihe. Asettelu ei ole vain komponenttien yhdist\u00e4mist\u00e4 piirikaavion mukaisilla painetuilla viivoilla. Luotettavan tuotteen valmistamiseksi osat ja niiden liit\u00e4nn\u00e4t on sijoitettava harkitusti.<\/p>\n\n\n\n<p>Jos ulkoasu on huono, voi synty\u00e4 h\u00e4iri\u00f6it\u00e4 tai huono suorituskyky, ja teoreettinen suunnittelu voi ep\u00e4onnistua. Jotkin layoutit t\u00e4ytt\u00e4v\u00e4t tekniset vaatimukset, mutta n\u00e4ytt\u00e4v\u00e4t sotkuisilta. Ep\u00e4tasainen ja ep\u00e4j\u00e4rjestyksess\u00e4 oleva sijoittelu ei ainoastaan heikenn\u00e4 visuaalista laatua, vaan se my\u00f6s vaikeuttaa kokoonpanoa ja huoltoa. Se ei ole j\u00e4rkev\u00e4\u00e4 suunnittelua.<\/p>\n\n\n\n<p>Yll\u00e4 olevien ohjeiden tarkoituksena on opettaa peruspiirilevyjen asettelun tuntemus tavallisille painetuille piireille. Noudata niit\u00e4, jotta asettelu olisi mahdollisimman j\u00e4rkev\u00e4\u00e4. Hyv\u00e4 asettelu v\u00e4hent\u00e4\u00e4 j\u00e4ljen pituutta, v\u00e4hent\u00e4\u00e4 h\u00e4iri\u00f6it\u00e4, parantaa mekaanista kest\u00e4vyytt\u00e4, auttaa j\u00e4\u00e4hdytyksess\u00e4 ja helpottaa valmistusta ja huoltoa.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00e4yt\u00e4nn\u00f6n tarkistuslista PCB-asettelua varten (pikaohje)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Jaa piiri toiminnallisiin lohkoihin ja sijoita lohkot signaalivirran mukaisesti.<\/li>\n\n\n\n<li>Sijoita tuloon ja l\u00e4ht\u00f6\u00f6n liittyv\u00e4t osat liittimien l\u00e4helle.<\/li>\n\n\n\n<li>Sijoita korkeataajuiset lohkot tiiviisti ja pid\u00e4 niiden j\u00e4ljet hyvin lyhyin\u00e4.<\/li>\n\n\n\n<li>Korkeaj\u00e4nnite- ja pienj\u00e4nnitealueet on erotettava toisistaan.<\/li>\n\n\n\n<li>Varaa tarvittaessa tilaa metallisuojille.<\/li>\n\n\n\n<li>Pid\u00e4 l\u00e4mp\u00f6\u00e4 tuottavat osat l\u00e4hell\u00e4 tuuletusta tai alustaa.<\/li>\n\n\n\n<li>Pid\u00e4 l\u00e4mp\u00f6tilaherk\u00e4t osat kaukana l\u00e4mm\u00f6nl\u00e4hteist\u00e4.<\/li>\n\n\n\n<li>K\u00e4yt\u00e4 pystysuoraa asennusta tiheille, pienille osille. K\u00e4yt\u00e4 vaaka-asennusta vakauden ja helpomman reitityksen vuoksi.<\/li>\n\n\n\n<li>Pid\u00e4 v\u00e4hint\u00e4\u00e4n 3 mm:n et\u00e4isyys komponenttien tyynyist\u00e4 levyn reunaan, kun osat ovat levyn reunalla; tyypillinen tyynyn keskikohdan ja reunan v\u00e4linen et\u00e4isyys \u2265 2,5 mm.<\/li>\n\n\n\n<li>K\u00e4yt\u00e4 vakioruudukkov\u00e4li\u00e4, kun suunnittelet automaattista kokoonpanoa (2,54 mm tai 2,5 mm).<\/li>\n\n\n\n<li>Pid\u00e4 tyynyjen keskiv\u00e4li v\u00e4hint\u00e4\u00e4n levyn paksuutta pienemp\u00e4n\u00e4.<\/li>\n\n\n\n<li>K\u00e4yt\u00e4 painavissa osissa juottamisen lis\u00e4ksi mekaanisia tukia.<\/li>\n\n\n\n<li>Lis\u00e4\u00e4 j\u00e4ykisteet tai kehykset suurille levyille (&gt; 200 \u00d7 150 mm).<\/li>\n\n\n\n<li>J\u00e4t\u00e4 tilaa testauspisteille ja huoltoyhteyksille.<\/li>\n\n\n\n<li>Varmista, ett\u00e4 komponenttien akselit kohdistuvat toisiinsa siisteyden vuoksi aina kun mahdollista, mutta valitse ep\u00e4s\u00e4\u00e4nn\u00f6llinen asettelu RF:lle, jotta j\u00e4ljityspituutta voidaan v\u00e4hent\u00e4\u00e4.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-uagb-faq uagb-faq__outer-wrap uagb-block-8c5f044e uagb-faq-icon-row uagb-faq-layout-accordion uagb-faq-expand-first-true uagb-faq-inactive-other-true uagb-faq__wrap uagb-buttons-layout-wrap uagb-faq-equal-height\" data-faqtoggle=\"true\" role=\"tablist\"><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-166caa47\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\">Mik\u00e4 on l\u00e4pivientien p\u00e4\u00e4teht\u00e4v\u00e4 piirilevysuunnittelussa?<\/span><\/div><div class=\"uagb-faq-content\"><p>L\u00e4piviennit yhdist\u00e4v\u00e4t piirilevyn eri kuparikerroksia, jolloin signaalit tai virta kulkevat niiden v\u00e4lill\u00e4. Niill\u00e4 on keskeinen rooli monikerroksisten piirilevyjen yhteenliitt\u00e4misess\u00e4.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-edca6e14\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\">Mit\u00e4 eroja on l\u00e4pivientireikien, sokeiden l\u00e4pivientien ja upotettujen l\u00e4pivientien v\u00e4lill\u00e4?<\/span><\/div><div class=\"uagb-faq-content\"><p>L\u00e4pivientirei\u00e4t kulkevat koko levyn l\u00e4pi, sokeat l\u00e4piviennit yhdist\u00e4v\u00e4t ulko- ja sis\u00e4kerrokset ja upotetut l\u00e4piviennit ovat piilossa sis\u00e4isten kerrosten v\u00e4liss\u00e4.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-5cc2d238\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\">Miten via-koot vaikuttavat piirilevyn suorituskykyyn?<\/span><\/div><div class=\"uagb-faq-content\"><p>Pienemm\u00e4t l\u00e4piviennit s\u00e4\u00e4st\u00e4v\u00e4t tilaa ja v\u00e4hent\u00e4v\u00e4t signaalih\u00e4vi\u00f6it\u00e4, mutta ne maksavat enemm\u00e4n ja ovat vaikeampia valmistaa. Suuremmat l\u00e4piviennit ovat helpompia valmistaa, mutta viev\u00e4t enemm\u00e4n pinta-alaa.<\/p><\/div><\/div><\/div>\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>PCB Component Layout Principles In PCB layout design, the placement of components is critical. It affects how neat the board [&hellip;]<\/p>","protected":false},"author":1,"featured_media":4020,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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Component Layout Principles In PCB layout design, the placement of components is critical. 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