Ki sa ki se yon PCB nan-twou e poukisa li enpòtan sou an lèt detache sikwi tablo? Yon PCB egzije nan twou oswa twou pou konekte kouch li yo. Understanding the standard through-hole sizes used by PCB manufacturers can help you design boards to meet common bit sizes.

Creole nan gwosè twou

Manifaktirè PCB yo gen pwòp seri gwosè twou estanda yo pou chwazi nan lè perçage twou, men yo ka anjeneral itilize nenpòt gwosè twou estanda. An jeneral, manifaktirè PCB yo ka fè dyamèt PCB nan twou tankou ti tankou 0.15 mm, konpare ak gwosè nòmal 0.6 mm.

Kondisyon PCB gwosè twou

Sa a se yon etid apwofondi nan kondisyon yo ki gwosè.

PCB nan gwosè twou

Gwosè a nan yon PCB nan twou ka varye depann sou kote li yo, itilize, ak lòt faktè, ki se poukisa chak manifakti PCB ofri plizyè gwosè ti jan PCB. Most manufacturers can make holes as small as 0.15 mm or larger holes of 1 mm or larger. Lè w ap konsidere gwosè a nan twou ki nesesè yo, ou bezwen tou konsidere bag la oswa pad kwiv alantou twou a, ki pral fòme.

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.

Creole nan gwosè twou

Pa nesesèman gen okenn gwosè estanda PCB atravè-twou nan fabrikasyon PCB, menm jan gwosè estanda PCB atravè-twou a souvan varye ant manifakti ak manifakti PCB. Sepandan, anpil manifaktirè PCB pito sèvi ak gwosè ti jan komen, ki yo ka refere yo kòm gwosè estanda ti jan PCB. Youn nan gwosè ki pi komen se 0.6 mm, men 0.2 mm ak 0.3 mm yo tou souvan itilize.

Type of PCB through hole

Ou ka itilize chak gwosè estanda nan twou pou kreye divès kalite PCB nan twou, tou depann de kouch, konstriksyon, konsepsyon, ak objektif PCB la. Twa kalite PCB ki pi komen nan twou yo se:

Plake nan twou

Galvanoplastik nan twou (PTH) se nan twou ki kouri nan tout kouch yon PCB pou konekte kouch anwo ak anba yo. Ou ta dwe kapab wè PTH soti nan yon bout nan PCB nan lòt la. PTH ka plake oswa ki pa plake. Ki pa Peye-plake nan twou pa fè elektrisite, Lè nou konsidere ke plake nan twou yo galvanize, ki vle di ke yo fè elektrisite nan tout kouch PCB la.

Twou avèg

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.

embedded

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. Ou pa ka wè materyèl antere sou kouch ekstèn PCB la.

Bagay ou dwe konsidere

Gen kèk bagay ou dwe konsidere lè w ap kreye yon PCB. Premyèman, ou ta dwe konnen ki rapò aspè nan konsepsyon 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.

Twou entegre oswa avèg ka sèvi PCB ou pi byen ak yon rapò aspè nan 15: 1, pandan y ap PTH ka travay byen ak yon rapò aspè ki ba nan 2: 1. Ki jan ou fè chwazi epesè nan kwiv PCB? Usually, through holes in the outer layer (e.g., through holes) require a thicker layer of copper than the buried through holes inside. Vòltaj la itilize pa PCB a tou afekte epesè nan kwiv la. 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:

Atravè tant lan

Tant lan nan twou kreye yon kouch baryè soude sou PCB nan twou a olye ke ranpli twou a ak materyèl. 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.

Pa bloke

Pwosesis la nan-twou rakorde ranpli twou a ak materyèl ki pa kondiktif ak sele li ak yon mask. Through-hole clogging also covers the ring and does not produce a smooth, glossy surface.

Pa ranpli

Atravè-twou ranpli sèvi ak résine yo kreye yon twou pèmanan plen. 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 nan aplikasyon plating twou

Konpayi fabrikasyon yo ka itilize plizyè teknik diferan pou aplike PCB la atravè plating nan twou pou asire efikasite li. 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.

Yon lòt metòd se galvanoplastie, nan ki PCB la ale nan yon beny galvanoplastie. Nan pwosesis sa a, kwiv kouvri mi yo nan chak PCB nan twou, sa ki lakòz yon epesè menm nan materyèl la kondiktif. Metòd sa a gen tandans yo dwe pi long ak chè pase pwosesis la lank, men li kapab tou fòme yon kouch plis serye ak kosyon.

Sequential drilling blind drilling and deep drilling

PCBS ak twou avèg ka fabrike nan de fason. 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.

Kapasite nan konbine apwopriye lyezon, perçage ak sekans plating fè li posib yo kreye plizyè estrikti twou avèg. Tout depann de si twou a avèg ka pase nan kouch menm soti nan kouch ekstèn lan.

Simultaneous deep drilling or reverse drilling is the process of removing any unused copper drum residue from the through hole. This usually happens when high-speed signals are distorted as they pass through copper tubes between PCB layers. If using a signal layer results in long transversals, there will be a lot of distortion.

Rapò aspè PCB defini kòm rapò epesè plak la ak dyamèt twou a. Twou avèg mande pou rapò aspè nan 1 a 1 oswa pi gran.

Lè se perçage gwo twou san fon te pote soti, se pwofondè nan twou a defini nan mete kanpe yon pè nan twou ki presize kouch yo kòmanse ak fini soti nan bò a nan tablo a. Se dyamèt la ti jan pou perçage gwo twou san fon kalkile nan fòmil sa a:

Retounen egzèsis gwosè = Twou / pad gwosè twou + 2 x Règleman konsepsyon Retounen egzèsis gwosè twò gwo

PCB overinductance calculator

PCB enduktans nan twou depann sou plizyè faktè, ki gen ladan gwosè nan twou, gwosè bag, rapò aspè, ak presizyon perçage. Ou ka jwenn kalkilatris sou entènèt pou ede ou kalkile bon PCB selon gwosè ou bezwen itilize.