Stellar Industries
Thermal Management Specialists

Thick Film Design Guidelines

Thick Substrate Chart

Sub Material Criteria:

I. Types:

  • Al2O3: 96%, 99.5%, 99.6%
  • BeO: 99.5% [Special-325W/mK]
  • AlN [170W/mK or 200W/mK]

II. Length & Width Tolerance:

  • As Fired Full Face Sub: 1%
  • Diced Part: Standard: 0.001"
  • For material < 0.040" thick

III. Thickness Tolerance:

  • As Fired: 10%
  • Lapped: 0.001"
  • Special: As low as 0.0002"

IV. Lapped Surface Finishes:

  • 96% Al2O3: 18-in Nominal
  • 99% Al2O3: 10-in Nominal
  • BeO: 25-in Nominal
  • AlN: 18-in Nominal

Printed Material Criteria:

THK Film Types:

  • Conductors: Au, PtAu, PdAg, Ag, Cu
  • Refractory: MoMn
  • Dielectric, Solder Masking & Brazing
  • Solder Paste: PbSn

II. Geometry Restrictions:

  • Maximum Printable Area:
  • Standard: 3" Sq. / Special: 5" Sq.
  • Maximum Diced Part Thickness:
  • 96% Al2O3: 0.080"
  • 99% Al2O3: 0.040"
  • BeO: 0.075"
  • AlN: 0.120"

III. Pattern Tolerance:

  • Minimum Trace/Space Width & Diameter:
  • Au: 0.005"/ 0.008" Dia.
  • PtAu: 0.006"/ 0.008" Dia.
  • PdAg: 0.005"/ 0.008" Dia.
  • Ag: 0.005"/ 0.008" Dia.
  • Cu: 0.005"/ 0.008" Dia.
  • Refractory: 0.010"/ 0.010" Dia.
  • Dielectric: 0.010"/ 0.010" Dia.
  • Solder Mask: 0.010"/ 0.020" Dia.
  • Solder Paste: 0.020"/ 0.020" Dia.

Printed Feature Size:

  • Conductors: 0.003"
  • Refractory: 0.005"
  • Solder Mask: 0.010"
  • Standard Printed Pullbacks:
  • Single Side Print: 0.002" MIN.
  • > Single Side Print: 0.003" MIN.
  • Pre Laser Work: 0.005" MIN.
  • Post Laser Work: 0.005" MIN.

IV. Finishes Available (Refractory only):

  • Electroless or Electrolytic Ni:
  • Standard: 50-in or 100-in Nominal | Special: Upon Request
  • Electroless or Electrolytic Au: Standard: (Flash) 4-10-in | Special: Upon Request

V. Thru-holes & Filled Vias:

  • Hole Size Requirement: Standard 1:1 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
  • Filled Via Holes Available Upon Request
 
 

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

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