Stellar Industries
Thermal Management Specialists

Copper Plate Up Design Guidelines

Copper Plate Up Chart

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:18 in Ra
  • BeO:25 in Ra

Metalized Material Criteria:

I. CPU THICKNESS CATEGORIES:

  • CPU1: Up to 15 m (45% Tolerance*)
  • CPU2: > 15-50m (45% Tolerance*)
  • CPU3: > 50-75m (30% Tolerance*)
  • CPU4: Special
  • *Cu Thickness Tolerance per Side*
  • Overall Thickness Tolerance of 12.5m 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: 12.5m 12.5m with Overlay Metal
  • Flush to Base Metal
  • Guillotine Critical Edge: Available for CPU3 & CPU4

III. FINISHES AVAILABLE:

  • Electroless Phosphorous Nickel: 2.5m Minimum
  • Customer Specified Thickness
  • Optional: Boron Nickel
  • Electroless Gold: 0.5m Minimum or Flash: 0.1 0.25m
  • Customer Specified Thickness
  • Selective Gold / Tin Coating:
  • Compositions: 75/25, 80/20 or Requested
  • Standard Barrier Metal: Pt: 5000
  • Other Offered Barriers: Ti / Pt or Ni
  • Au Overcoat: 1000
  • Standard Au/Sn Thickness: 4-6m
  • Standard Au/Sn Thickness Tolerance: 1m
  • 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
 
 

Stellar Industries Corp. 50 Howe Avenue Millbury, MA 01527 | 877.840.1884 | 508.865.1668 | sales@stellarind.com

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