via in pad is a surface mount pad that serves double duty … in pad •via in pad is a surface...
TRANSCRIPT
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Via in Pad
• Via in Pad is a Surface Mount Pad that serves double duty as a Surface Mount Pad and a Via Hole.
• A Via in Pad is a Surface Mount Pad with a Via Underneath.
• It can be a Double Sided Via, a Multilayer Via, or a Blind Via.
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Surface Mount PadA Surface Mount Pad with a Via
Underneath, also known as a “Via in Pad”
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Via In Pad
• Via in pad is used to increase component density.
• It serves double duty as a via and as a surface mount pad for a component.
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Via in Pad Construction
• Our Standard process for constructing single wrap Via in Pad is shown in the next series of slides.
• We will also pay attention to certain aspects of processing, just for clarification.
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Multilayer out of the press
• This is an example of an 8 Layer.
Surface Copper = .0007” (1/2 Ounce)
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• When Via in Pad is manufactured we separate out all other Plated and Non-Plated holes.
• This isolates the Via in Pad holes and simplifies the Via Fill process later on.
• Then after the Via Fill is complete we Drill and process the remaining holes and final image.
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Only Holes for Via in Pad are drilled
Drilled Hole
Surface Copper = .0007” (1/2 Ounce)
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Plasma Etching, Desmear
Plasma Etching
and Desmear
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Electroless
Surface Copper = .00075
Copper in Hole = .00003 (Very Thin!)
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Wrap Plating
Target copper thickness in the hole is .0013”
Copper in Hole .00053”Surface Copper .0013”
Class 3 Plating
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What is Wrap Plating?
• Wrap PlatingThe electrolytic hole plating deposition continuously extending onto the surface from a plated via structure. (From IPC-T-50)
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Simply put:
• Wrap Plating is copper plating from the hole that wraps around the surface foil.
• Wrap Plating is done without any image defined by photoresist.
• Panels are taken from the deposition line and Wrap Plated.
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• Wrap Plating is the same process as Flash Plating, only we put on more copper by extending the plating time.
• Flash Plating puts on about .00015”, while Wrap Plating puts on .0003-.0006” (2X to 4X more copper).
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•
Button Plating
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• We Wrap Plate the minimum amount to keep the thickness of the copper on the surface to a bare minimum so etching is easier.
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Why Wrap Plate?
• Wrap Plating was introduced in IPC-6012B Amendment 1.
• It sole purpose is to increase Via in Pad reliability in the field.
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Old Method, No Wrap Plate Wrap Plate Method
Wrap Plating
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• No Wrap Plating leads to the Separation of the Surface Plating from the Hole Plating.
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Button (Spot) Plate Resist and Image
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What is Button (Spot) Plating?
• Button PlatingThe process of plating only in the holes and on pads.
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Why Button Plate?
• When we Wrap Plate we only put the minimum amount of copper required for the wrap plate in the hole and on the surface (plus a little extra to compensate for Planerizing).
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• Button Plate brings the thickness of copper in the hole up to the finished requirement without adding extra copper to the surface.
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• Remember, Wrap Plate goes in the hole and on the surface, but Button Plate goes only in the hole and on the pad, not the entire surface.
• So to build up the correct amount of copper in the hole before Via Fill we Wrap Plate first, then Button Plate.
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Button PlatingSurface Copper .0013”
Copper in Hole .0015”
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Resist Stripped
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Via Filling
60 % filled for Class 3
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PlanerizeEasy to sand too much!
Careful!
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Why Planerize?
• Planerizing removes the surface copper from the Button Plateprocess, leaving a perfectly flat surface.
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• Remember: we plate as little copper on the surface as possible to aid in etching.
• Generally we try to add only .0001” to .0002” extra copper to allow for losses at Planarization.
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A Note about Planerizing
• Because we only plate an extra .0001” during Wrap Plating to allow for Planerizing, we have to measure the copper frequently to ensure we have not cut below our minimum wrap requirement.
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Remaining Holes Drilled
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Plasma #2
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Electroless # 2
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Plating Resist / Final Image
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Final Copper Plating
.0008” Average for Class 2 .001” Average for Class 3
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Tin Plating
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Resist Strip
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Etch Image
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Tin Strip
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Solder Mask
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Immersion Gold Plating
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This is our standard procedure for Via Fill.
Base Foil
Electroless 1
Wrap Plating
Electroless 2
Final Plating
Filled Via Plating
Via Fill
Nickel Plating Gold Plating
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• There is also a double and a triple wrap. The process is the same as depicted in the slides above, it’s just repeated by multiple lamination, Drill, and Plate Cycles.
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Blind and Buried Via
• 12 Layers Built using 3 segments.
• Segment 1 Layers 1-4
• Segment 2 Layers 9-12
• Segment 3 Layers 5-8
• Then a final Lamination to put it all together.
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Segment 1
• Layer 1-4 Blind Via Segment
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Core Material
• We call Innerlayer Core’s
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Image Etched
• Image, Etch, Inspect Layer 2/3
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Layup
• Layup using Prepreg and foil.
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Press
• Press Segment 1
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Drill
• Drill Segment 1
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Plasma
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Electroless
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Wrap Plate
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Plating Resist
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Copper Plate
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Resist Strip
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Etch Resist
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Etch Layer 4 Cover Layer 1
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Strip Resist
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Segment 2
• Layer 9-12 Blind Via Segment
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Layers 9-12 are the mirror image of Layers 1-4
Layers 9 – 12 Segment 2
Layer 9 is etched
Layer 12 is Preserved
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Segment 3
• Layers 5 – 8 Buried Via Segment
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Pull Material
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Etch Innerlayer
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Layup
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Press
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Drill
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Plasma
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Electroless
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Plating Image
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Plate Copper
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Plate Tin
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Strip Resist
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Etch
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Strip Tin & Test
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Oxide
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Final Lamination
• Segment 1-3-2
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Segment 1 Layers 1-4
Segment 3 Layers 5-8
Segment 2 Layers 9 - 12
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Layup
Segment 1
Segment 3
Segment 2
Prepreg
Via Blocker
Via Blocker
Buried
Blind
Blind
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Press
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Planerize Excess Epoxy
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Drill
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Plasma
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Electroless
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Plating Resist
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Copper Plate
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Tin Plate
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Resist Strip
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Etching Details
Base Copper .0007”
Final Copper Plating
Electroless .00003”
Wrap .0005”
Electroless .00003”
.00003”
.00050”
.00003”
.00070 “
.00126”
.00003”
.00050”
.00003”
.00035 “
.00091”
Using Quarter Ounce
Class 3 Wrap Plating Limits the Final Line width to .00425/.00425”.
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• Copper does not etch straight up and down. Instead, it makes an hourglass shape.
• The smallest line you can etch is dependent upon the thickness of copper.
• Spacing also plays an equal role.
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Yellow box shows the original size.
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Etch
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• Started with ½ ounce foil, but the total copper thickness increased because of the wrap plating.
• This was a single wrap so .0012”, or about 1 ounce, is the amount of copper to etch.
• For a double wrap this would increase to .0018”.
• For a triple wrap this would increase to .0024”, or about 2 ounces.
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Tin Strip
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Soldermask
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Immersion Gold
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Blind Via With Via in Pad
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Buried Via
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Finished