PCBA suaisam cu a tlangpi in Schematic tlaihnak, a hnu ah PCB chiahnak, Lamhruainak, DRC (Design Rule Check), cun DFM Check, cun a chuah Gerber Files, NC Drill Files, BOM (Thilri cazin), cun Pumhnak suaimi. A harmi suaisamnak caah, HDI PCB thiamnak he laser in cawhmi microvias cun a zulmi lamination a herh men lai.

A hrampi luhternak file hna ah aa telmi hna cu:

• Netlist
• Seh thilri suaimi
• Cheukhat Datasheet
• Riantuan khawhnak cazin (a tlawmbik hnuzulhnak kauh/hlatnak, a tlawmbik khur ngan, solder mask tidil kauhnak, impedance uknak herhmi)

A hrampi chuahmi file hna ah hin:

• Gerber RS-274X silole ODB++
• NC Drill File
• File thim le chiah
• Stencil Gerber
• Hneksaknak Point Report
• Assembly Drawing & Silkscreen File

2.1 Hmunhma Phunglam

Hmunhma cu PCBA suaisamnak hrampi a si i direct in a hnorsuan Signal Routing Quality, Lungthawhnak Riantuannak, cun Ser khawhnak. A hmaanmi chiahnak cu a biapi tuk impedance uknak PCB suaisamnak le a rangmi digital circuit hna.

• Riantuannak tthencheunak: Hnahnawhnak hrial khawhnak dingah analog, digital, thazaang, le a rangmi pehtlaihnak hmun pawl kha thleidan hna.
• Signal Flow: A tannak le aa mernak hmun zorternak caah signal a luannak lei ah thilri pawl kha chiah hna.
• A biapi tukmi thilri biapi bik: MCU/FPGA/SoC, DDR, suimilam, le power modules pawl kha hmasa bik ah chiah hna.
• A kam chiahnak: Mechanical herhmi tlinternak caah board kam pawng i pehtlaihnak, button le LED pawl.
• Lungthawhnak Layout: Lungthawhnak hlohnak lam asiloah lumnak hri pawng i a ummi thazaang sangmi thilri hna; bet chap thermal via arrays a linmi thilri tangah.

2.2 Lamhruainak A Herhmi

• Hmuh khawhnak kauhnak le a tu lio thilti khawhnak: 0.5 mm 1 oz dar cung i a kauhnak nih 1 A hrawng a phorh. Current sang deuh caah, hmang caah dar asiloah a thuk deuhmi dar rit.
• Aa dangmi Pahnih: USB, HDMI, LVDS, Ethernet a herh Sauhnak I tluknak, Hmunhma tlukruannak, cun A fekmi pehtlaihnak zohkhenh signal zumhawktlak sinak le tlawmter luhternak tlau cun sunghnak kirter.
• Controlled Impedance: A rangmi signal nih cun stack-up in tuakmi sining impedance a herh; a tlangpi man cu 50 Ω pakhat lawng a ngeimi le 100 Ω aa dangmi an si. Engineering zohfelnak ah aa tel awk a si impedance uknak fehternak.
• Kirnak Lam: Tthenmi vanlawng EMI konglam hrial khawhnak ding caah a tlingmi zohchunh awk vanlawng kha hngalhter; bet chap thlennak lam layer thlennak pawng ah.
• In: A rang tukmi lam kha tlawmter; hmannak Hnulei cawhnak silole Mitcaw/Thuhmi Vias a herh tikah. HDI suaisamnak caah, hmang aa tlummi lam silole aa tthencheu mi lam he dar in khahter.

DFM ttha lo nih Solder Bridging, Thlan lung in cheh, A lum lomi hrennak fonhnak, Cheukhat thlennak, cun Solder Balls. Mi tampi chuah hlan ah DFM hlathlainak nih a voikhatnak chuahmi a kilven.

3.1 Vawlei sining suaisam

Ram sining nih a zulh awk a si IPC-7351. Bochan tlak caah pad suaisam ningcang cu a herh PCB fonh cun PCBA pumhnak.

• CHIP thilri (0402, 0603, 0805): Thlan lungtum hrial khawhnak ding caah pad ngan le hme cu stencil aperture le reflow profile he aa tlak a hau.
• QFN (Quad Flat No-lead): A tanglei Thermal Pad a thurhnawmmi le a kikmi tthencheunak zorternak caah tthen a si awk a si; hmannak hnimhnak hmaikhuh fianternak (SMD) silole non-solder mask fianternak (NSMD) pads kha aa tlak ning tein.
• BGA (Ball Grid Array): Pad diameter cu a tlangpi in ball diameter 80-85% a si; solder mask onnak cu pad cung i solder mask hrial khawhnak ding caah a dikthliar in a si a hau. A ttha ngaimi BGA caah, hmang hrennak hmaikhuh tidil kauhnak ≤0.1 mm asiloah a herh ahcun tidil kha hloh.
• SOT/SOP/QFP: A ttha ngaimi pitch nih cun aa pehtlaimi hrial khawhnak ding caah a tlingmi solder mask dam kauhnak a herh.

3.2 Cheukhat Hmunhma le Hmuhning

• A pawng i a ummi thilri karlak nih lak-le-chiah nozzle le riantuan ṭhan a herhmi (≥0.3 mm) a tlinh a hau.
• AOI zohfelnak a fawi deuh nakhnga aa lo ngaimi thilri pawl kha lam khatlei ah chiah hna.
• Reflow tuah lio ah muihnak hrial khawhnak ding caah a sangmi le a tawimi thilri karlak ah a za tawk in hlatnak chiah.

3.3 Solder Mask & Silkscreen

• Solder Mask Dam a kauhnak ≥0.1 mm cu aa tthen lonak ding caah.
• Silkscreen pads aa tluk awk a si lo; ≥0.2 mm hlatnak chiah.
• Polarity hmelchunhnak, Pin 1 langhtertu, cun Reference Designator a fiang a hau.
• Customer duh ning in solder mask rong (a sen, a sen, a sen, a sen, a rang) kha thim; legend chuahmi rel khawhnak kha hngalhter.

4.1 DFT

DFT nih ttha tein, man tlawm tein PCBA hneksaknak a tuah khawh i hneksaknak program sernak le thilri suaisamnak a bawmh.

• Vanlawng Hlathlainak Hneksaknak: Thilri hman a hau lo; prototype le a hmete caah a ttha.
• ICT (In-Circuit Test): Hneksaknak hmun le thilri a herh; aw thangpi caah aa tlak. Kan suai hneksaknak hmun sining a tlingmi huhphenhnak he.
• FCT (Riantuannak Circuit Hneksaknak): PCBA riantuan ning taktak a hngalhter.
• Ramri zohfelnak (JTAG): Taksa hneksaknak hmun tlawmternak caah a chunglei chip hneksaknak logic a hman.

DFT herhmi:

• Hneksaknak hmun diameter ≥0.8 mm, aa hlatnak ≥1.27 mm.
• A si khawh ahcun hneksaknak hmun kha khatlei ah phawtzamh.
• Hneksaknak hmun pawl kha dawnkhantu um loin le a sangmi thilri hna he aa hlatnak ah chiah hna.
• Thazaang le vawlei hri caah hneksaknak hmun kha chiah law power-off tawite hneksaknak cun power-on voltage tahnak.

4.2 DFA

DFA nih cun fonh tthatnak le palhnak khamnak ah a biapi in a chiah.

• Panelization: Hmannak V-cut (V-Scoring) silole Mouse Bite / Stamp Hole. Caah pcb pumhnak a kam ah aa thlaimi thilri hna he, hmang tab lamhruainak vok sehnak he.
• Tooling Rail: 3-5 mm kauhnak cu conveyor thlennak le chiahnak caah a si.
• Fiducial Mark: A tlawmbik vawleicung zumhawktlak 2-3; BGA le QFN tibantuk aw-ttha tein hmanmi thilri hna caah hmunhma fiducials.
• Poka-Yoke: A hnulei in luhternak hrial khawhnak dingah pehtlaihnak pawl nih aa dangmi dirhmun an ngeih kha zohfel.

5.1 Signal Integrity (SI)

SI kongkau ah A thla, Biaruahnak, Overshoot, Undershoot, cun Caan thlennak. A rang tukmi PCB suaisam hman khawh suaisam hlan i zohchunhnak cun suaisam hnu fehternak tuaktan awkah mit hmanthlak.

• Impedance I tluknak: Source series donghnak, parallel donghnak, asiloah AC donghnak.
• Sauhnak I tluknak: DDR data/address phu le aa dangmi pahnih caah serpentine routing.
• Crosstalk Suppression: 3W phunglam (a hlatnak ≥3× hnuzul kauhnak); a biapi tukmi hmelchunhnak caah ralvengtu hmelchunhnak chap.
• Via in kir: Loop inductance zorternak caah tthen thlennak pawng ah thlennak lam kha chap.

5.2 Thazaang tthatnak (PI)

PI kongkau ah Thazaang aw, Voltage ttumchuknak, cun Vawlei tlik. A ttha tein suaimi Thazaang phawtzamhnak network (PDN) ttha tein riantuannak caah a biapi tuk.

• Decoupling Capacitor: Power pin pakhat cio pawng ah 0.1 μF + 10 μF fonhmi chiah; hmannak low-ESL capacitors a sangmi-frequency tthencheunak caah.
• Thazaang Vanlawng Tthennak: Analog le digital thazaang vanlawng aa dangmi; rang tukmi signal he tthencheunak tan kha hrial.
• Low Impedance Path: A pawngkam thazaang le vawlei vanlawng nih vanlawng capacitance a ser; thazaang le vawlei tthen karlak ah a tlawmmi dielectric kha kilven.
• Relnak in: High-current lam caah aa tlukmi vias tampi; hmannak dar in a khatmi lam a sangmi lam hna caah.

5.3 EMC (Electromagnetic Compatibility)

EMC nih a khuh EMI (Electromagnetic Interference) cun EMS (Electromagnetic Susceptibility). EMC zulhphung zohfelnak nih phungning tein hneksaknak tuah hlan ah suaisamnak ttihnung a hmuh khawh.

• 20H Nawlbia: Power plane tthen pawl kha 20× tthennak in tthen law a tthennak hmun pawl kha zorter.
• Interface thlennak: I/O pehtlaihnak ah TVS, common mode chokes, ferrite beads, le capacitors pawl kha chap.
• Huhphenhnak: A fakmi hmun hna ah huhphenhnak khuhnak hmang; pek vawlei cung hrennak phaw hrennak caah.
• Lungvar & Suimilam: Lungvar tang ah lam kalnak a um lo; ralvengtu hmelchunhnak hmang law suimilam hmelchunhnak kha tawi tein chiah.

5.4 HDI PCB Design

A tammi suaisamnak caah, HDI PCB thiamnak he laser in cawhmi microvias, mitcaw lam, cun phummi lam a hme deuhmi form factors le a sang deuhmi routing density a tuah khawh. Ruahchannak biapi:

• Microvia aspect ratio a tlangpi in ≤1:1.
• Hmannak aa tlummi microvias milu tamnak hmun ah tthen thlennak caah.
• A zulmi lamination tuahsernak nih microvia tthen tampi a onh.
• Via-in-pad he dar in khahter cun planarization BGA fanout caah.

6.1 BGA Design

BGA pad suaisam nih hnimhnak chuah khawhnak kha direct in a hnorsuan PCB fonh cun PCBA pumhnak, a hlei in aw ttha BGA hmannak ah.

• Pad diameter ≈0.8–0.85× ball diameter (tahchunhnak ah, 0.3 mm ball caah 0.25 mm pad).
• Solder mask onnak cu a kam khat ah 0.025-0.05 mm in pad nakin a ngan deuh.
• NSMD (Non-Solder Mask Defined) silole SMD (Solder Mask Defined); NSMD cu a ttha ngaimi BGA caah a tlangpi a si.
• Fanout vias 0.2 mm/0.1 mm asiloah a hme deuh; hmannak Via-in-Pad he Dar in a khatmi / Resin in a khatmi solder hlonhnak khamnak caah.
• Bet chap khuachung zumhnak hmelchunhnak BGA pawng ah a dikmi chiahnak caah.

6.2 QFN suaisamnak

QFN (Quad Flat No-lead) thilri pawl nih ralring tein lumternak thilri suaisam a herh.

• Thermal pad kha a hme deuhmi pad tampi ah ṭhen asiloah a tthencheu mi stencil ongnak he pad pakhat lawng hmang law a tlawm deuh lai.
• AOI zohfelnak caah pin pads kha 0.2-0.3 mm tiang a cunglei ah sauh.
• Hmannak Resin Plugging silole Dar in khah thermal pad vias caah solder wicking khamnak caah.
• Thazaang sang QFN caah, chap array hmangin lumternak chunglei dar vanlawng he pehtlaihnak.

6.3 0402 / 0201 / 01005 Micro Components

• 0402 pad karlak: 0.4-0.5 mm; 0201: 0.25–0.3 mm; 01005: 0.15–0.2 mm.
• Anti-solder ball stencil apertures (a tlawmmi asiloah a tlawmmi) hmang.
• Chiahnak a dikthliar caah a za tawk in fiducial marks pe.
• Ruah glue phawtzamhnak a ritmi thilri hna he kaphnih fonhnak caah.

7.1 Stencil Aperture Design

Stencil onnak suaisam nih direct in a khiah cawhmi cawhnuk chuahnak tthatnak le PCBA pakhat cio caah a ttha bikmi a si awk a si.

• Stencil a thuhnak: 0.1–0.15 mm a tlangpi in; 0.08 mm cu a hme tete caah; 0.2 mm cu a sangmi current caah.
• Area Ratio: Aperture area / aperture wall area > 0.66.
• Aspect Ratio: Aperture kauhnak / stencil thuhnak > 1.5.
• Special Apertures: QFN lumternak kuang hmete thlalang tampi; BGA a tlongmi asiloah a tlukmi tlawmternak; chip thilri caah anti-solder ball notched apertures.
• Ruah step stencil cawhmi thilri ngan le hme caah (tahchunhnak ah, a sangmi hmun caah a thukmi stencil, a tlawmmi caah a tlawmmi).

7.2 Reflow & Wave Soldering

• Reflow Soldering: SMT thilri hna caah; a dikmi a herh lum le lum lo sining (lumter hmasa, hnim, thlet ṭhan, lumter). Hmannak nitrogen a kir tthan a ttha deuhmi hnimhnak le a zortermi oxidation caah.
• Wave Soldering: Through-hole (DIP) thilri le SMT red glue tuahnak caah.
• Selective Wave Soldering: Through-hole thilri hna caah hmunkhat ah hrennak; mixed-technology board caah a ttha.
• Lead-Free Process: SAC305 hnimhnak cawhnuk; a sang bik lumnak lumnak 235-250 °C. A tlangpi in a cunglei dihmi hna ah aa tel lead-free HASL, LUNGTLIN, Volunteer Meithat Zung, hnimhnak ngun, cun hnimhnak tin.

7.3 Cawhmi Pumhnak

SMT reflow le DIP wave soldering fonh, asiloah hman Pin-in-Paste (PIP) reflow chung i a ummi a chung thilri hna caah.

8.1 Panelization tuah ning

• V-cut (V-Scoring): Man tlawm; a tthencheunak thilri a um lomi a tlarimi thingphel caah.
• Mouse Bite / Stamp Hole: Aa tluk lomi board asiloah a kam thilri hna caah; hmannak tab lamhruainak he vok nih a cuk.
• Bridge + Mouse Bite: Thazaang le tthennak fawinak a fonh.

8.2 Tooling Rail & Fiducial Mark

• Hriamnam hri kauhnak: 3-5 mm.
• Fiducial hmelchunhnak: 1 mm kauhnak, 2-3 mm hrennak hmaikhuh onnak, sui asiloah hnimhnak tin dih.
• BGA/QFN a ttha ngaimi thilri hna caah hmunhma fiducials.

8.3 Panel ngan le zat

• Lak-le-chiah le thlet tthannak oven ri (≤400 mm × 400 mm) chung ah panel ngan le hme.
• Tlamtling tein riantuan khawhnak le thilri hmannak; thlennak hrial.
• Hmannak tthennak tabs silole lamhruainak hmunhma depaneling tuah lio ah lungretheihnak zorternak caah.

9.1 Electric Check

• DRC ah palhnak a um lo.
• A biapi tukmi signal saunak tlukruannak, impedance, hlatnak.
• Relnak le a tu lio thilti khawhnak in thazaang net.
• Signal tthatnak lemsoinak a phichuak nih mit suaimi a herhmi a tlinh.

9.2 DFM Check

• IPC-7351 ningin pad ngan le hme.
• Thilri karlak i hlatnak nih a tlawmbik lak-le-chiah a herhmi a tlinh.
• Solder mask dam, silkscreen, polarity hmelchunhnak fiang tein.
• Stencil aperture nih area ratio a ton.
• Panelization cun thilri hmanmi tlanglawng caan karlak.

9.3 DFT Check

• A biapi tukmi net cung ah hneksaknak hmunhma khuhnak.
• Hneksaknak hmun pawl cu dawnkhantu um loin.
• ICT thilri hman khawhnak.

9.4 Pumhnak Check

• Tooling rail le fiducial hmelchunhnak a um.
• Panelization tuah ning aa tlak.
• V-cut in aa hlatnak ≥0.5 mm.

9.5 Cazin tling tein ttialmi

• Gerber tthen min saknak cu a tlarimi a si.
• BOM thilri nambar, thilri, zat a dik.
• BOM he aa tlakmi file kha thim law chiah.
• Stencil file cu PCB suaisam he aa tlak.

Hlanlio thilri asiloah hman ti lomi thilri caah PCBA circuit boards, PCBA hnulei thlennak taksa board chungin schematics, BOM, le Gerber file pawl a ser ṭhan khawh i hmuh ṭhanmi data kha a thar in a peh khawh PCB suaisam cun PCBA pumhnak riantuan ning.

Kan hnulei thlennak kalning ah aa telmi hna cu:

• Board hmanthlaknak le X-ray zohfelnak chunglei tthen pawl map tuah awk.
• Cheukhat hngalh khawhnak le BOM chuah khawhnak hman ti lomi thilri thlennak hna zong aa tel.
• Schematic tlaihnak netlist remhthannak in.
• PCB suaisamnak nuamhsaihnak DFM tthanchonak he.
• PCBA fonhnak zohchunh awk le riantuan ning hneksaknak.

A dang man chapmi riantuannak:

• Aa tlakmi khuhnak a harmi pawngkam caah.
• Thlaici cinnak le khumh hninhnak doh khawhnak caah.
• Underfill BGA le CSP thilri hna caah.
• Riantuan ṭhan le remh ṭhan BGA riantuan tthannak hmun hmangin.
• Riantuannak hneksaknak sernak PCBA caah.