General Design Rules

These general parameters and specifications are intended to help manufacturing engineers and designers to create a circuit layout by utilizing the most effective metalization solutions while designing products with REMTEC’s PCTF® technology in mind.

PCTF ® Technology is based on plating copper on Thick Films on a ceramic substrate, in single or multiple up image arrays. Copper is plated to the required thickness and configuration. Basic rules developed for design and manufacturing with air fireable thick film hybrids are applicable with some additions and modifications as described in REMTEC’s Design Guidelines.

Design Specifications Outline

Base Material Alumina, Beryllia or Aluminum Nitride
Line Resolution (Signal) 0.004″ Lines and Spaces*
Line Resolution (Power) 0.008″ Lines and Spaces*
Conductor Thickness Available from 0.001″- 0.010″
Conductor Resistance From 0.6 to 0.07 milliohms/square
Temperature Range – 55°C to +200°C
Solderability Complete wetting with Sn62 @ 230°C
Leach Resistance No solder leaching or line reduction after 10, ten second dips in Sn62 @ 230°C
Moisture Resistance No failures after 1,000 hours @ 85°C, 85% RH and 50 VDC
Wire Bondability Excellent for Au and Al

* Note: For better line/spacing resolution, please contact the factory.

Designing with PCTF: Application Notes

Plated Copper Lines Resistance

Line Thickness

Resistivity

.001″

0.65 mohms/sq

.002″

0.35 mohms/sq

.003″

0.26 mohms/sq

.005″

0.14 mohms/sq

.007″

0.10 mohms/sq

.010″

0.06 mohms/sq

Printed Thru Holes (PTH) & Copper Plated Thru Holes (CPTH) Resistance

Ceramic thickness

Through Hole Diameter

PTH Resistance
mohms

CPTH Resistance
mohms

0.015″

.008″

2.5

0.40

.0.025″

.010″

4.0

0.52

0.040″

0.012″

8.0

0.70

 

POWERPLUGS: Copper Plated Plugged Via Holes in Ceramic

Resistance

Ceramic
thickness

Plugged Via
Size

Resistance-mohms
(PCTF)

Resistance (mohms)
Au

0.010″

.005″

0.50

1.5

0.015″

.008″

0.42

1.3

0.020″

.010″

0.38

1.14

0.025″

.010″

0.47

1.4

Thermal Conductivity

Via Plug Material

Thermal Conductivity

PCTF

200

Au

65

Printed Resistors

Plated Cu and Printed Resistors: Wide range 50 mohms to 10 Mohms, ratio matched, power = 100 W, small geometry (.010” x .010”).

  • Standard air fireable thick film resistors, from 50 mohms up to 1 Mohms per square.
  • Minimum resistor size .010”x .010” with .003” minimum overlap.
  • Power rating: consult factory for rating and required geometry.
  • Tolerances: +/- 1% typical.
  • Matching: +/- 0.5% typical.
  • TCR: 50- 200 ppm/°C typical.

Detailed Design Guidelines and a graphical representation of the design rules and recommendations may be obtained by filling the Additional Information Request Form.

Need More Information?

Please see our Technology Features page or contact our Sales Department for more information

Contact Us