PCB e phunyang ke eng mme hobaneng e le bohlokoa ho boto ea potoloho e hatisitsoeng? PCB e hloka mekoti kapa liliba ho hokahanya likarolo tsa eona. Understanding the standard through-hole sizes used by PCB manufacturers can help you design boards to meet common bit sizes.

E tloaelehileng ka boholo ba lesoba

Baetsi ba PCB ba na le sete ea bona ea boholo ba likoti tseo ba ka khethang ho tsona ha ho cheka masoba, empa hangata ba ka sebelisa boholo ba sekoti bo tloaelehileng. Ka kakaretso, bahlahisi ba PCB ba ka etsa bophara ba PCB ka masoba a manyane joaloka 0.15 mm, ha e bapisoa le boholo bo tloaelehileng ba 0.6 mm.

Litlhoko tsa PCB ka lesoba

Ena ke boithuto bo tebileng ba litlhoko tsa boholo.

PCB ka boholo ba lesoba

Boholo ba PCB ka lesoba bo ka fapana ho latela sebaka sa eona, ts’ebeliso le lintlha tse ling, ke ka lebaka leo moetsi e mong le e mong oa PCB a fanang ka boholo bo boholo ba PCB. Most manufacturers can make holes as small as 0.15 mm or larger holes of 1 mm or larger. Ha o nahana ka boholo ba sekoti se hlokahalang, o boetse o hloka ho nahana ka selikalikoe kapa sebaka sa koporo se potileng lesoba, se tla theha.

How do you calculate rings? The ideal ring is equal to the sum of the diameter of the copper pad minus the diameter of the drill hole divided by 2, which gives the rig the best chance of hitting the center of the pad for optimal connectivity.

E tloaelehileng ka boholo ba lesoba

Ha ho na hakaalo hore ho na le tekanyetso ea “PCB” ea “lesoba” tlhahiso ea PCB, joalo ka ha boholo ba PCB bo phunyang hangata bo fapana ho tloha moetsi ho isa ho moetsi oa PCB. Leha ho le joalo, bahlahisi ba bangata ba PCB ba khetha ho sebelisa boholo bo tloaelehileng, boo ba ka bo bitsang boholo bo tloaelehileng ba PCB. E ‘ngoe ea boholo bo tloaelehileng ke 0.6 mm, empa 0.2 mm le 0.3 mm le eona e sebelisoa hangata.

Type of PCB through hole

U ka sebelisa boholo bo bong le bo bong ba lesoba ho etsa mefuta e fapaneng ea PCB ka masoba, ho latela lera, kaho, moralo le sepheo sa PCB. Mefuta e meraro e tloaelehileng ea PCB ka mekoti ke:

E koahetsoe ka lesoba

Li-electroplated through-hole (PTH) li na le masoba a phunyeletsang likarolo tsohle tsa PCB ho hokahanya likarolo tse holimo le tse tlase. U lokela ho bona PTH ho tloha pheletsong e ‘ngoe ea PCB ho ea lehlakoreng le leng. PTH e ka koaheloa kapa ea se koahetsoe. Li sa koahetsoeng ka masoba ha li tsamaise motlakase, athe tse koahetsoeng ka masoba li khethiloe ka motlakase, ho bolelang hore li tsamaisa motlakase likarolong tsohle tsa PCB.

Sekoti se foufetseng

Blind holes connect the outer (top or bottom) layers of the PCB to one or more inner layers, but do not completely drill through the board. Precise drilling of blind holes can be challenging, so they are typically more expensive to manufacture than PTH.

aa ageletsweng

Embedded holes can also increase the cost of PCB because they are difficult to manufacture. The holes are located in the inner layer of the PCB to connect two or more inner layers. U ke ke ua bona lintho tse bonahalang tse patoa ka lera le ka ntle la PCB la.

Lintho tseo u lokelang ho li nahana

Ho na le lintho tse ‘maloa tseo u lokelang ho nahana ka tsona ha u theha PCB. Taba ea mantlha, o lokela ho tseba hore na karolelano ea likarolo ke eng ho moralo oa PCB. The aspect ratio is the PCB thickness relative to the diameter of the through hole, which determines the reliability of the copper plating on the PCB. The higher the ratio, the more difficult it is to obtain reliable plating, which affects the type of hole and plating method you choose.

Likoti tse kenelletseng kapa tse foufetseng li ka sebeletsa PCB ea hau hantle ka sekhahla sa 15: 1, ha PTH e ka sebetsa hantle ka sekhahla se tlase sa 2: 1. U khetha joang botenya ba PCB koporo? Usually, through holes in the outer layer (e.g., through holes) require a thicker layer of copper than the buried through holes inside. Matla a sebelisoang ke PCB a ama le botenya ba koporo. High voltage applications typically require thicker PCB copper than low voltage applications.

By filling program

Sometimes PCB through-holes need to be filled, for example to reduce the risk of trapping air or increase electrical conductivity. Some common ways to fill through holes include:

Ka tente

Tente e phunyang ka sekoting e theha mokelikeli oa solder holim’a mokoti oa PCB ho fapana le ho tlatsa lesoba ka lisebelisoa. This can be a quick, easy and cost-effective option to cover the through-holes, but the tent-style through-holes may reopen over time.

Ka ho thiba

Ts’ebetso ea ho phunya masoba e tlatsa lesoba ka lintho tse sa tsamaeeng mme e e tiisa ka mask. Through-hole clogging also covers the ring and does not produce a smooth, glossy surface.

Ka ho tlatsa

Ho tlatsa ka lesoba ho sebelisa lehoakhoa ho theha lesoba le tlatsitsoeng ka ho sa feleng. A through-hole fill is a common through-hole fill in which the manufacturer fills the through-hole with conductive material, coats the surface with copper, and then trims the surface. This process can route signals to other areas of the PCB.

PCB ka likopo tsa sekoti

Baetsi ba ka sebelisa mekhoa e fapaneng e fapaneng ho kenya PCB ka masela a phunyeletsang ho netefatsa katleho ea eona. One common method is to use a low viscosity ink that covers the inside of the through-hole to form a conductive layer. Then through the heat curing process to bond the ink.

Mokhoa o mong ke ho khetha motlakase, moo PCB e kenang ka bateng e khethollang motlakase. Ts’ebetsong ena, koporo e koahela mabota a PCB ka ‘ngoe ka masoba, e leng se etsang hore ho be le botenya ba thepa e tsamaisang. Mokhoa ona o tloaetse ho ba bolelele le ho bitsa chelete e ngata ho feta ts’ebetso ea enke, empa o ka etsa lesela le tlamo e tšepahalang haholoanyane.

Sequential drilling blind drilling and deep drilling

Li-PCBS tse nang le masoba a foufetseng li ka etsoa ka litsela tse peli. This can be done by laser drilling or by a method called continuous layer construction. Using the sequential construction method, pairs of layers can be drilled and electroplated before bonding is applied. Because they have holes at both ends, electroplating is easy to penetrate for chemical coatings. It also allows blind holes to be designed in such a way that they can pass through multiple layers.

Bokhoni ba ho kopanya tatellano e loketseng ea ho kopanya, ho cheka le ho roala, ho etsa hore ho khonehe ho theha likarolo tse ngata tse sa bonahaleng tsa masoba. Sena sohle se ipapisitse le hore na lesoba le foufetseng le ka feta le mekhahlelo e tsoang lera la kantle.

Simultaneous deep drilling or reverse drilling is the process of removing any unused copper drum residue from the through hole. Hangata sena se etsahala ha matšoao a lebelo le phahameng a sothehile ha a feta har’a methapo ea koporo lipakeng tsa likarolo tsa PCB. Haeba ho sebelisa lera la letšoao ho fella ka mahlakore a malelele, ho tla ba le khopama e ngata.

Karolo ea likarolo tsa PCB e hlalosoa e le karolelano ea botenya ba poleiti ho ea bophara ba seliba. Masoba a foufetseng a hloka likarolo tse 1 ho isa ho tse 1 kapa ho feta.

Ha ho cheka ho tebileng ho etsoa, ​​botebo ba sekoti bo hlalosoa ka ho theha likoti tse hlalosang likarolo tsa ho qala le ho phethela ho tloha lehlakoreng la boto. Bophara ba hanyane bakeng sa ho cheka ho tebileng bo baloa ka foromo e latelang:

Boima ba ho cheka morao = Boholo ba lesoba / pad + 2 x Melao ea moralo Boima ba ho cheka ka morao bo boholo haholo

PCB overinductance calculator

Ho kenella ka sekoting sa PCB ho latela lintlha tse ‘maloa, ho kenyeletsoa boholo ba lesoba, boholo ba lesale, karolelano ea tšobotsi le ho nepahala ha ho cheka. U ka fumana li-calculator tsa inthanete ho u thusa ho bala PCB e nepahetseng ho latela boholo boo u hlokang ho bo sebelisa.