General Design Rules
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 |
CPTH Resistance |
|
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 |
Plugged Via |
Resistance-mohms |
Resistance (mohms) |
|
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.