DITF Solid Copper Filled Vias are qualified for use in Space Applications. Filled Via Qualification Report

 

Solid Copper Vias versus Solid Gold Vias

• Cost effective - 10-20% less cost than comparable Gold
• Thermal conductivity 33% greater than Gold
• Lead time 20% sooner than Gold
• Facilitized for prototype through high volume production quantities
• Can withstand up to +300°C processing temperatures

Via and/or Wrapped Connections

In any circuit medium, vias are a great advantage to the designer.  However, the tendency to overpopulate ground areas is a temptation obvious in many designs.  Critical to hard substrate manufacturing is the careful consideration of via quantity and location.  While aiding the performance of the design, poorly placed vias can degrade yield due to reduced durability of the substrate in manufacturing.  DITF CAD services can optimize your design for your electrical need balanced with manufacturing enhancements.  One method of enhancing a design which has developed into a significant advantage to designers is the use of the filled via.  DITF uses the industry preferred solid Cu and Au process as opposed to the less-desirable glass/metal paste method used by other companies.

Plated Through Vs Filled Vias

Feature	DC Resistance	Inductance	RF Resistance
Filled	1 mΩ	78pH	4 mΩ
Plated Through	4 mΩ	81pH	14 mΩ

 

Plated Through Via Vs Substrate Thickness

Substrate Thickness	Substrate Material	Preferred Via Diameter	Allowable Via Diameter	Via Spacing
				Cntr.-Cntr.	Cntr.-Edge
.005"	Al2O3	.005"	.003" - .005"	.027"	.023"
.010"	Al2O3,AIN	.010"	.006" - .010"	.030"	.025"
.015"	Al2O3,AIN	.015"	.008" - .015"	.035"	.027"
.020"	Al2O3,AIN	.020"	.010" - .020"	.040"	.030"
.025"	Al2O3,AIN	.025"	.012" - .025"	.045"	.033"
.040"	Al2O3,AIN	.032"	.024" - .040"	.060"	.040"
.050"	Al2O3,AIN	.040" - .050"	.025" - .050"	.070"	.045"

Filled Via Vs Substrate Thickness

Substrate Thickness	Substrate Material	Ideal Via Diameter	Via Spacing
			Cntr.-Cntr.	Cntr.-Edge	Fill
.010"	Al2O3	.008"	.028"	.020"	Cu,Au
.015"	Al2O3	.012"	.034"	.020"	Cu,Au
.020"	Al2O3,AIN	.016"	.032"	.020"	Cu,Au
.025"	Al2O3,AIN	.020"	.040"	.025"	Cu,Au

Via Application Data

Filled Via Conductivity
Parameter	Valve
Copper 99.9%	393 W/M°C
Gold 99.9%	300 W/M°C
Filled Via Planarity	+0/-.0003"

 

Filled Via Aerospace Qualification Report

East Coast Sales

Tom Lavallee

(603) 845-3450

tpl@ditf.com