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  • Blind and Buried Via PCB 01

  • Blind and Buried Via PCB 01

  • Blind and Buried Via PCB 01

Blind and Buried Via PCB 01

Layers:126

Material:FR4 Tg180

Board Thickness:Shows as photo

Surface treatment: ENIG


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Description :

Via is an important component for multi layer PCBAs. Printed circuit boards are superimposed by copper foil circuit layer upon layer, and the connection between the different circuit layers is the via. There are three most common via are plating through hole, blind hole and buried hole.

Plating Through Hole(PTH)

PTH  is the most common via, just take up PCB and face to the light, if you can see the light, then it is the “through hole”. PTH is also the simplest kind of hole because it just need to use drill or laser light to make a full borehole.

Blind Via Hole(BVH)

Connect the outermost circuit of the PCB and the adjacent inner layer with plated through-hole, since we cannot see the opposite, so it is called “blind pass”. In order to increase the space utilization of PCB circuit layer, blind via hole came into being.

Buried Via Hole (BVH)

Buried via hole connects to any circuit layer of PCB but do not pass to the outer layer. This process cannot be done using the method of bonding after drilling, it must be in the individual circuit layer when the implementation of drilling, the first part of the internal bonding after the first plating treatment, and finally all the bonding.

You can know more clearly about the above three hole based on the below chart.


11.jpg

Applications :

Blind and Buried Via PCB 01

Flow Chart :

Blind and Buried Via PCB 01

Capability :

Rigid PCB Capability
Layers≦36
MaterialsStandard FR4/Mid-Tg FR4/Hi-Tg FR4,CEM-1/CEM-3,PTFE,Rogers,Arlon,Taconic,
Teflon,Isola,ITEQ,Dupont,Polyimide,Metal Core Material,Ventec,Nelco
Max. PCB Panel Size1496mmx620mm
Board Thickness0.2-12mm
Board Thickness Tolerance±10%
Min Conductor Line Trace/SpaceInner Layers:≧3/3mil(0.075/0.075mm for 1/2oz base Copper)
Outer Layers:≧3.5/3.5mil
For
Via in Pad
Resin plugged hole size0.3-0.75mm
Resin plugged board thickness0.3-8mm
Resin plugged maximum aspect ratio20:1
Resin plugged minimum hole to hole space(mm)0.65mm
For HDIMin. mechanical drilling hole diameter0.15mm
Min. laser drilling hole diameter0.075mm
Max. aspect(micro-via)1:1
Max. dielectric thickness for laser drill0.05-0.15mm
Bottom pad size(under micro-via)Hole Size+0.17mm
Top side pad size(on micro-via)Hole Size+0.15mm
Copper fillingY
Via in pad designY
Buried hole resin pluggedY
Min. via size can be copper filled0.075mm
Min plated hole size20um(0.8mil)
Min Blind/Buried hole size0.2mm(8mil)
Min Annular Ring±0.076mm(±3mil)
Min width of cutout (NPTH)0.8mm
Min width of slot hole (PTH)0.6mm
Solder mask colorgreen, red, blue, white, yellow, purple, black, orange, LPI, matt green
Silkscreen colorWhite, Yellow, Red, Black
Surface finishENIG, Immersion Tin, HASL, HASL-LF, OSP, Gold finger, Immersion Silver
OutlineRouting, V-cut, Bridge, Stamp hole
Outline Tolerance±0.15mm (±6mil)
Hole TolerancePTH +/-3mil
NPTH +/-2mil
Controled Impendence+/-5%(<50Ω), +/-10%(≧50Ω)
E-TestFlying probe test:0.4-6.0mm, max 19.6"*23.5"
Min spacing from test pad to board edge:0.5mm
Min conductive resistance:5Ω
Max insulation resistance:250mΩ
Max test voltage:500V
Min test pad diameter:6mil
Min test pad to pad spacing:10mil
Max test pad to pad spacing:10mil
Max test current:200MA
AOIOrbotech SK-75 AOI:0.05-6.0mm, max23.5"*23.5"
Orbotech Ves machine:0.05-6.0mm, max23.5"*23.5"



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