Yuav Ua Li Cas Txheeb Xyuas Ib Lub PCB Zoo: Phau Ntawv Qhia Txog Kev Tshuaj Xyuas Tag Nrho

I. Kev Tshuaj Xyuas Theem Tsim Qauv (DFM/DFA)

Lub Hom Phiaj Tseem Ceeb: Txheeb xyuas qhov tsis zoo ntawm kev tsim qauv ua ntej kom txo qis kev pheej hmoo ntawm kev ua haujlwm dua tshiab.

1. Kev Txheeb Xyuas Kev Tsim Qauv Kev Ua Haujlwm Hluav Taws Xob

• Kev Sib Tw Impedance: Cov yam ntxwv impedance ntawm cov kab xa xov ceev ceev (piv txwv li, USB, HDMI, RF kab) yuav tsum ua tau raws li qhov yuav tsum tau tsim (piv txwv li, ib leeg-kawg 50Ω, sib txawv 90Ω). Cov cuab yeej simulation SI (piv txwv li, HyperLynx) yog siv los zam kev cuam tshuam thiab kev txo qis ntawm cov teeb liab.
• Kev Ncaj Ncees ntawm Lub Teeb Liab: Tshawb xyuas seb puas muaj kev sib txuas lus hla, kev ncua sijhawm, thiab kev ua haujlwm ntawm lub zog (PI) kom ntseeg tau tias cov teeb liab zaus siab tsis muaj kev cuam tshuam. Tswj kev sib txuas lub zog/av av kom zoo kom txo tau kev tawg hluav taws xob EMI.
• Tsim Txheej Txheej: Paub meej tias cov txheej rwb thaiv tsev tuab npaum li cas, suav cov txheej tooj liab npaum li cas, thiab kev sib sau ua ke kom sib npaug ntawm kev tso cua sov tawm thiab kev tswj hwm impedance, ua tau raws li EMC cov cai.

2. Kev Tshawb Xyuas Txoj Cai Tsim Khoom (DFM)

• Cov Kev Ntsuas Kab: Qhov dav/qhov sib nrug tsawg kawg nkaus ≥3mil (1mil rau HDI), lub qhov ncauj solder choj ≥4mil.
• Qhov Txoj Kab uas hla thiab Pad: Pom zoo kom siv 0.3 hli, daim ntaub 0.6 hli kom tiv thaiv kev sib txawv ntawm qhov laum lossis daim ntaub sib cais.
• Tooj Liab Tuab Tsim: Cov kab hluav taws xob siv 1oz–2oz (35–70μm) los ua kom tau raws li qhov tam sim no thiab tiv thaiv kom tsis txhob kub dhau.

3. Kev Hloov Kho Qauv Kho Tshuab

• Cov qauv qhia, cov qhov, thiab cov qhov sib phim qhov kam rau ntawm lub thawv (± 0.1 hli).
• Cov khoom uas rhiab rau cua sov nyob deb ntawm cov khoom tsim cua sov uas muaj txoj kev tso pa tawm.
• Cov cim polarity yuav tsum meej rau cov capacitors thiab ICs.

II. Kev Saib Xyuas Zoo Hauv Kev Tsim Khoom

Lub Hom Phiaj Tseem Ceeb: Kev tswj hwm lub sijhawm tiag tiag ntawm cov txheej txheem kev hloov pauv kom ntseeg tau tias ua raws li cov txheej txheem.

1. Kev Tshuaj Xyuas Cov Khoom Siv Thiab Cov Khoom Siv

• Xyuas hom khoom siv (FR-4, Rogers, PI), tuab (± 5%), thiab qhov roughness ntawm tooj liab.
• Qhov saum npoo yuav tsum tsis muaj khawb, tsis muaj oxidation, tsis muaj delamination.

2. Kev Tshawb Fawb thiab Vias Txheej Txheem

• Qhov Txoj Kab uas hla qhov tseeb: Kev kam rau siab ± 5%, phab ntsa qhov huv si, tsis muaj burrs lossis smear.
• Qhov Metallization: Tooj liab tsis siv hluav taws xob ≥0.5μm, tooj liab plated ≥20μm (IPC-6012 Chav Kawm 3).

3. Kev Thaij Duab thiab Kev Txiav

• Kev sau npe sib txawv ≤5mil, qhov dav dav sib xws, tooj liab seem ≤1%.
• Silkscreen meej, offset ≤10mil, adhesion zoo.

4. Kev Tshuaj Xyuas Qhov Chaw Tiav

• POM ZOO: Nickel 3–5μm, kub 0.05–0.1μm, tsis muaj daim dub.
• Chaw Ua Haujlwm Tua Hluav Taws Dawb: Txheej 0.2–0.5μm, ion kis kab mob ≤1.56μg/cm².
• HASL: Thickness ≥2.5μm, du nto, ≥95% solder wetting.

5. Kev Tswj Xyuas Lamination thiab Impedance

• Kev sau npe sib txawv ≤10mil, txawm tias dielectric tuab, tsis muaj npuas lossis delamination.
• Lub teeb liab tseem ceeb impedance nyob rau hauv ± 10%, txheeb xyuas los ntawm TDR.

III. Kev Ntsuas Kev Ua Haujlwm thiab Kev Ntseeg Tau ntawm Cov Khoom Tiav Lawm

Lub Hom Phiaj Tseem Ceeb: Xyuas kom meej tias PCB ua haujlwm hluav taws xob thiab ruaj khov mus sij hawm ntev.

1. Kev Ntsuas Kev Ua Haujlwm Hluav Taws Xob

• Kev Txuas Ntxiv ≤5mΩ, rwb thaiv tsev ≥10⁹Ω @500V DC.
• Kev sim qhov poob ntawm qhov ntxig (≤3dB @5GHz) thiab qhov poob rov qab rau cov qauv tsim ceev.

2. Kev Ntsuas Kev Ntseeg Tau

• Kev Poob Siab Kub: 260 ° C, 10 vib nas this immersion, tsis muaj delamination lossis blistering.
• Dielectric withstand: 500V DC rau 1 feeb, tsis muaj kev tawg.
• Kev vuam tau: 245°C rau 3–5 vib nas this, ≥95% ntub.

3. Kev Tshuaj Xyuas Pom thiab Qhov Loj

• AOI rau cov voj voog luv luv / qhib, lub ntsej muag solder, oxidation.
• Cov qauv qhia ± 0.1 hli, qhov ± 0.05 hli, lamination tuab ≤ ± 10%.

4. Kev Ntsuas Cov Qauv Siab Tshaj Plaws

• Plating Thickness: XRF los xyuas cov txheej tooj liab thiab kub/nickel.
• Tshooj hla: Kev kuaj xyuas qhov muag rau qhov tuab ntawm txheej, kev nplaum, thiab kev ua hlau rau phab ntsa qhov.

IV. Kev Tshuaj Xyuas Ntxiv Rau Qhov Xwm Txheej Tshwj Xeeb

1. Cov PCBs Uas Muaj Zaus/Sai Heev

• Lub tshuab ntsuas network rau S-parameters: teeb liab poob ≤3dB @≥5GHz, impedance yuam kev ≤±8%.

2. Cov PCBs uas yoog tau/Rigid-Flex

• Kev Ntsuas Kev Khoov: 100,000 lub voj voog @R≤2mm, tsis muaj kab nrib pleb.
• Lub Zog Kho Tshuab: Tsis muaj delamination nyob rau hauv cov cheeb tsam stiffened.

3. Cov PCBs Qib Automotive/Kho Mob/Aerospace

• Ua tau raws li IPC-A-600 Chav Kawm 3, UL, RoHS/REACH, V-0 nplaim taws tsis kam.

V. Cov Cuab Yeej Tshuaj Xyuas thiab Cov Qauv Kev Lag Luam