In PCB zane, akwai wurare da yawa da suke buƙatar la’akari da nisa na aminci. Anan, an kasafta shi zuwa nau’i biyu na wannan lokacin: ɗayan yana da alaƙa da aminci na lantarki, ɗayan kuma ba shi da alaƙa da aminci.

1. Nisan aminci mai alaƙa da lantarki
1. Tazara tsakanin wayoyi

Dangane da ikon sarrafawa na masana’antun PCB na yau da kullun, mafi ƙarancin tazara tsakanin wayoyi bai kamata ya zama ƙasa da mil 4 ba. Matsakaicin nisan layi kuma shine nisa daga layi zuwa layi da layi zuwa pad. Daga ra’ayi na samarwa, mafi girma mafi kyau idan zai yiwu, mafi yawanci shine 10mil.

2. Buɗewar kushin da faɗin kushin

Dangane da iyawar sarrafa kayan masana’antun PCB na yau da kullun, idan buɗaɗɗen kushin ya kasance da injina, mafi ƙarancin kada ya zama ƙasa da 0.2mm, kuma idan ana amfani da hakowar Laser, mafi ƙarancin kada ya zama ƙasa da mil 4. Haƙurin buɗewa ya ɗan bambanta dangane da farantin, gabaɗaya ana iya sarrafa shi a cikin 0.05mm, kuma mafi ƙarancin faɗin kushin kada ya zama ƙasa da 0.2mm.

3. Nisa tsakanin kushin da kushin

Dangane da ikon sarrafawa na masana’antun PCB na yau da kullun, nisa tsakanin pads da pads bai kamata ya zama ƙasa da 0.2mm ba.

4. Nisa tsakanin fata na jan karfe da gefen allon

Nisa tsakanin fatun jan karfe da aka caje da gefen allon PCB ya fi dacewa bai gaza 0.3mm ba. Saita ƙa’idodin tazara akan shafi na Zane-Dokokin-Board.

Idan babban yanki ne na jan karfe, yawanci yana buƙatar janyewa daga gefen allon, gabaɗaya saita zuwa 20mil. A cikin PCB zane da masana’antu masana’antu, a karkashin al’ada yanayi, saboda inji la’akari da ƙãre kewaye hukumar, ko don kauce wa curling ko lantarki short-circuiting saboda fallasa fata jan karfe a gefen jirgin, injiniyoyi sukan yada jan karfe a kan. babban yanki An rushe toshe ta mil 20 dangane da gefen allon, maimakon yada tagulla zuwa gefen allon. Akwai hanyoyi da yawa don magance irin wannan nau’in tagulla na tagulla, kamar zana shinge a gefen allo, sannan saita tazara tsakanin shimfidar tagulla da wurin ajiyewa. Anan akwai hanya mai sauƙi don saita nisan aminci daban-daban don abubuwan shimfidar tagulla. Misali, an saita tazarar aminci na dukkan allon zuwa 10mil, kuma an saita shimfidar tagulla zuwa 20mil, kuma ana iya cimma tasirin 20mil shrinkage na gefen allon. Ana cire mataccen jan ƙarfe da zai iya bayyana a cikin na’urar.

2. Rashin aminci na rashin wutar lantarki
1. Faɗin hali, tsawo da tazara

Ba za a iya canza fim ɗin rubutu ba yayin sarrafawa, amma faɗin layin halin D-CODE ƙasa da 0.22mm (8.66mil) yana kauri zuwa 0.22mm, wato, faɗin layin halayen L=0.22mm (8.66mil), kuma Duk faɗin harafin = W1.0mm, tsayin duka harafin H=1.2mm, da sarari tsakanin haruffa D=0.2mm. Lokacin da rubutun ya yi ƙasa da ma’auni na sama, sarrafawa da bugawa za su yi duhu.

2. Tazara tsakanin ta rami da ta rami (rami gefen ramin rami)

Nisa tsakanin vias (VIA) da vias (rami gefen rami) zai fi dacewa fiye da 8mil.

3. Nisa daga allon alharini zuwa pad

Ba a yarda allon siliki ya rufe kushin ba. Domin idan an lullube fuskar siliki da kushin, ba za a yi tinanin siliki ba yayin da ake yin tin, wanda hakan zai yi tasiri wajen hawan abubuwan. Gabaɗaya, masana’antar allo tana buƙatar sarari na 8mil don a tanadi. Idan yankin PCB yana da iyaka sosai, ba a yarda da farar mil 4 da kyar ba. Idan allon siliki da gangan ya rufe kushin yayin ƙira, masana’antar allo za ta kawar da kai tsaye daga ɓangaren allon siliki da aka bari a kan kushin don tabbatar da cewa an yi tinned pad.

Tabbas, ana bincika takamaiman yanayi daki-daki yayin zane. Wani lokaci allon siliki yana kusa da kushin da gangan, saboda lokacin da pad ɗin biyu suka yi kusa sosai, allon siliki na tsakiya zai iya hana haɗin siliki yadda ya kamata daga gajeriyar kewayawa yayin siyarwa. Wannan lamarin wani lamari ne.

4. Tsawon 3D da tazara a kwance akan tsarin injiniya

Lokacin hawa na’urori akan PCB, yi la’akari da ko za a sami rikice-rikice tare da wasu sifofi na injina a cikin jagorar kwance da tsayin sararin samaniya. Sabili da haka, lokacin zayyana, ya zama dole a yi la’akari da daidaitawa tsakanin abubuwan da aka gyara, samfurin PCB da harsashi na samfur, da tsarin sararin samaniya, da kuma adana tazara mai aminci ga kowane abin da aka yi niyya don tabbatar da cewa babu wani rikici a sararin samaniya.