starrflex-technik...• ipc-2223 . 15 delivery panel • stability • x-outs allowed • large...
TRANSCRIPT
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Starrflex-Technik
Besonderheiten und Anwendungen
40 Jahre Eltroplan 4.07.2019
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Hans-Joerg Etter
CEO
Optiprint AG
Berneck, Switzerland
+41 71 747 86 85
www.optiprint.ch
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Agenda
• Introduction
• Advantages and disadvantages of Flex-Rigid-PCBs
• Material selection
• Surface Finishes
• Cost drivers
• PCB-samples
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Optiprint
Optiprint Berneck
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Products and Prospectives
HF pcbs
Flexible and Rigid-flexible pcbs
Very fine lines pcbs
Special products
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Trade – Mix 2018
50%
36%
9%
Trade
Mix
Medical
Telecommunication
Security/Defence
Space/Aviation
Industry
EMS
Automotive
Others
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Product – Mix 2018
47%
50%
3%
Products RF
Flex
FR4
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Revenue/Sales - Employees
100
105
110
115
120
125
130
2012 2013 2014 2015 2016 2017 2018
Employees
15
17
19
21
23
25
2012 2013 2014 2015 2016 2017 2018
€
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Goals
• Know the possibilities and risks of Flex-Rigid-PCBs
• Know some important design rules
• Know common materials
• Know common surface finishes
• Understand cost drivers
• See samples of Flex-Rigid-PCB
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Remarks
• The following informations are basic guidelines for the construction of flex-rigid-PCB
• Special Design requires special processes. Ask your PCB-Producer if you have designs which do not follow the guide lines
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Agenda
• Introduction
• Advantages and disadvantages of Flex-Rigid-PCBs
• Material selection
• Surface Finishes
• Cost drivers
• PCB-samples
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Advantages
• Reduced assembly effort
• Space saving, Miniaturization
• Reduced weight
• Increased reliability
• increased connection quality
Reduced cost and space
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Disadvantages
• Special construction guide lines
• New PCB technology with increased design requirements
• Pick&place and assembly are more challenging
• More complex PCB production (higher cost for PCB)
• Different materials in rigid and flex area -> Impedance
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Design Rules
• Avoid PTH in bending area
• Distance drill holes from flex-rigid transition >1.0mm
• Distance pattern from flex-rigid transition >0.3mm
• Increase stability with copper
• Solid copper or chess pattern
• Teardrops
• IPC-2223
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Delivery Panel
• stability
• X-outs allowed
• large milling radius
• spacing between PCB
• Optimised for PCB-Manufacturer Production Panel
– E.g. Optiprint: 560x410 mm and 410x255 mm
• Fiducials and holes acc. to assembly
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Neutral bending zones
Wrong
Right
Flex section Rigid Rigid
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Minimal Bending radius
• 𝑅 = 𝑑2 + 𝑐 ∗ 100−𝐸𝐵𝐸𝐵 − 𝐷 [IPC-2223] – 𝑅 = bending radius – 𝑑 = thickness dielectricum with adhesive – 𝑐 = copper thickness – 𝐸𝐵 = % copper tension
• Rolled copper <16%
• ED-Copper < 11%
• Assembly ≈ 10%
• Dynamic bending ≈ 0.3% – 𝐷 = thickness coverlay with adhesive
Bending Radius = Thickness x 10
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Agenda
• Introduction
• Advantages and disadvantages of Flex-Rigid-PCBs
• Material selection
• Surface Finishes
• Cost drivers
• PCB-samples
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Flex materials
• Polyimide with adhesive
• Polyimide without adhesive
• Polyimid with sputtered copper
• LCP (Liquid Crystal Polymer)
• Material thicknesses: 12.5…125µm
• Copper thickness: 5…70µm
• Producers: DuPont, Espanex, Sheldahl, Thinflex, Krempel, Rogers
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Flexible materials with adhesive
• Epoxy- or acrylic-based adhesive between polyimide and copper
• Thickness in data sheet describes polyimide thickness
• Applications: mostly single- and double sided PCB
• Advantages: good pricing, very good peel strength
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Flexible materials without adhesive
• Without adhesive
• Sputtered copper as bonding agent
• For very thin copper thickness (<18µm) only available as ED-Cu
• Applications: Multilayer, Flex-Rigid
• Advantages: dimensional stability, defined electrical properties, high temperature resistance
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ED-Copperfoil
• ED = electro deposited = galvanic copper
• Often used for flex materials
• Not suited for extremely dynamic bending
• Different ED-Copper types available
– ED-HD (high ductility)
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RA-Copperfoil
• RA = rolled annealed = rolled copper
• Suited for dynamic bending
• Copper grain direction must be considered
• More expensive than ED-copper
• Copper plating (PTH) voids advantages
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Material selection
Best choice
1. Adhesiveless Material
2. Material with acryl-based adhesive
3. Material with epoxy-based adhesive
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Agenda
• Introduction
• Advantages and disadvantages of Flex-Rigid-PCBs
• Material selection
• Surface Finishes
• Cost drivers
• PCB-samples
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Cover surface
• Photosensitive, flexible solder mask
– Air spray
– Screen printing
• Coverlay (Polyimide)
– Mechanicaly structured
– Bonded with heat, pressure and vacuum
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Flexible soldermask
• Low-cost solution
• For low bending requirements (No buckling)
• No dynamic bending
• Bending radius >5mm
• Typical thickness 20µm
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Coverlay
• For high bending requirements
• Dynamic bending with optimised design and copper- and material-selection
• Good isolation (electrical and mechanical)
• Fine structures require laser cutting
• Flex-Rigid with mutliple flexible-cores separate cores
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Surface finish
• Chem. Nickel/Gold (ENIG)
– Only in rigid area
– Versatile standard finish
• Chem. Nickel/Palladium/Gold (ENEPIG)
– Only in rigid area
– Suited for Gold wire bonding
• Chem. Ag/Au (ISIG)
– New bendable finish
– Suited for Gold wire bonding
• ENTEK (OSP)
– Low-cost
– 1-2 times solderable
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Surface finish Properties HAL OSP ENIG ENEPIG ENIGEG EPIG ASIG ISIG Chem
Ag Chem
Sn
in-house external in-house in-house in-house external in-house external external external
Wire Bonding no no yes yes yes yes yes yes no no
Multiple
Solderability
yes limited yes yes yes yes yes yes yes yes
Pressfit
Technology
limited limited limited yes limited yes yes yes yes yes
Planarity no yes yes yes yes yes yes yes yes yes
Fine Pitch
Application
limited yes yes yes yes yes yes yes yes yes
Process
Maintenance
high low low low low low low low low low
Process Effort medium low medium medium high medium medium medium medium high
Process Cost medium low high high high high medium medium medium medium
Operating Safety bad good good good good good good good good good
Thermal Stress high low low low low low low low low low
Typical
Thickness
3-25µm 0.2-
0.5µm
Ni 3-
7µm
Au 0.05-
0.1µm
Ni 3-
7µm/ Pd
0.05-
0.3µm/ Au
0.015-
0.05µm
Ni 3-
7µm/ Au
0.4-
1.1µm
Pd 0.1-
0.2
Au 0.1-
0.2
Ag 0.12-
0.25µm
Au 0.02-
0.06µm
Ag 0.1-
0.4µm
Au 0.05-
0.2µm
Ag 0.15-
0.45µm
0.8-1µm
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Agenda
• Introduction
• Advantages and disadvantages of Flex-Rigid-PCBs
• Material selection
• Surface Finishes
• Cost drivers
• PCB-samples
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Cost split of a PCB
Flex material
Rigid Material
Bonding
Drilling
Plating
Other
To be discussed with your PCB supplier!
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Cost drivers
• Reduce drill holes
• Reduce bonding stages
• Reduce number of layers
• Reduce number of plating stages
• Use symmetric buildup
• Increase line/space
• Allow X-outs
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Agenda
• Introduction
• Advantages and disadvantages of Flex-Rigid-PCB
• Material selection
• Surface Finishes
• Cost drivers
• PCB-samples
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4-layer rigid-flex board
Medical Application
Sensorhand
Knee/leg prothesis
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4-layer rigid-flex board
Medical Application (in ear hearing aid)
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12-layer rigid flex board
Automotive Application (Formula 1)
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8-layer rigid flex board
Automotive Application (Engine Management)
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Aerospace Application
12-layer rigid-flex board
415mm x 393mm
16.33” x 15.47”
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16-layer rigid-flex
Safety Electronics Application
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2-layer rigid-flex board
Industrial Application
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10-layer rigid-flex board
Industrial Application – flatest e-motor
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Flexible multilayer
• 3-layer Flexible mulitlayer
• 0,3 mm total thickness
• 125 µm „flying leads“ galvanic tinned
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Laser cut profiles
• Edge spacing tolerances ± 10 μm to max ± 25 μm
• 80 μm microvias (through and blindholes)
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Rigid-flexible multilayer
• 8-layer multilayer
• flexible inner layer with coverlay
• 100 µm conductor widths and spacing on both sides 0,2 mm blind vias
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Rigid-flexible multilayer
• 6 flexible layers with coverlay
• 4 rigid layers on FR4
• Tight bend-radii possible
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Heatsink rigid-flexible multilayer
• Optimal heat dissipation through 1 mm copper plate
• 2 layers on Polyimid foil
• 2 layers on FR4 material
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Thermal Vias
• Paste, Copper, Cap plating • Short heat ways • Short bonding wires
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Ticer Technology
• Resistors directly formed during the PCB process
• 3-layer Rogers 4350 Multilayer • Thickness 1.15 mm • 25, 50, 100 Ohms/Square
100 Ohm Ticer foil
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Questions?
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Many thanks for your attention
Hans-Joerg Etter
Email: [email protected]
Telefon: +41 71 747 86 85
Web: www.optiprint.ch