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Copper Plate Up Design Guidelines
Sub Material Criteria:
I. TYPES:
- AlN, Tc=170 & 200W/mK
- BeO: 99.5%,Tc=>280W/mK
- Special: BeO Tc=325W/mK
II. SIZES:
- Length & Width:
- AlN: 50.8mm Sq., 57.15mm Sq.,76.2mm Sq.
- BeO: 52.33mm Sq., 58.42mm X 73.66mm, or 76.2mm Sq.
- Thickness: AlN: Standard: 0.381mm & 0.635mm
- Special: 0.254mm [CPU1 only]
- BeO: Standard: 0.381mm & 0.635mm
- Special: 0.254mm [CPU1 only]
- Lapped to Customer Specifications
III. LENGTH & WIDTH TOLERANCE:
- As Fired: ±1%
- Diced: Standard: ±0.025mm
- Special: ±0.0127mm
IV. THICKNESS TOLERANCE:
- As Fired: ±10%
- Lapped: ±0.025mm
- Special Lapped: ±0.0127mm
V. LAPPED SURFACE FINISHES:
- AlN:18µ in Ra
- BeO:25µ in Ra
Metalized Material Criteria:
I. CPU THICKNESS CATEGORIES:
- CPU1: Up to 15 µm (±45% Tolerance*)
- CPU2: > 15-50µm (±45% Tolerance*)
- CPU3: > 50-75µm (±30% Tolerance*)
- CPU4: Special
- *Cu Thickness Tolerance per Side*
- Overall Thickness Tolerance of 12.5µm Available
II. PATTERN TOLERANCE:
- Minimum Trace / Space Size:
- CPU1: 0.127mm
- CPU2 & CPU3: 0.254mm
- Standard Metal Feature Size: ±0.025mm
- Minimum Metal Pullback Except Critical Edge:
- From Diced Edge: 0.050 ±0.050mm
- Base Metal Critical Edge Pullback: 12.5µm ±12.5µm with Overlay Metal
- Flush to Base Metal
- Guillotine Critical Edge: Available for CPU3 & CPU4
III. FINISHES AVAILABLE:
- Electroless Phosphorous Nickel: 2.5µm Minimum
- Customer Specified Thickness
- Optional: Boron Nickel
- Electroless Gold: 0.5µm Minimum or Flash: 0.1 0.25µm
- Customer Specified Thickness
- Selective Gold / Tin Coating:
- Compositions: 75/25, 80/20 or Requested
- Standard Barrier Metal: Pt: 5000Å
- Other Offered Barriers: Ti / Pt or Ni
- Au Overcoat: 1000Å
- Standard Au/Sn Thickness: 4-6µm
- Standard Au/Sn Thickness Tolerance: ±1µm
- Overlay Location Tolerance: ±0.05mm
- Standard: Flush with Base Metal - Potential
- For AuSn, 0.102mm Maximum Overspray Potential All Edges
- Minimum Overlay Feature Size: 0.127mm
IV. THRU HOLES CRITERIA:
- Hole Size:
- Standard1: 1 Ratio Between Hole Diameter & Ceramic Thickness
- Special: Upon Request
- Minimum Distance Hole Edge to Diced Part Edge to be equal to whichever is larger between ceramic thickness or hole diameter
- Minimum Metal Pullback: 0.127mm
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