Condura®+ Alumina substrate with pre-applied solder

Pre-applied systems simplify processes, decrease investments, improve production yield and reduce production risks. The new Heraeus pre-applied solder Condura®+ customized material system fulfills those targets while saving time and money during the die attachment manufacturing process.

DCB+ alumina substrates with pre-applied solder

In the electronics market the simplification of processes is crucial for higher yield with lower costs and minimized risks. In order to support these key targets, Heraeus offers pre-soldered Condura®+ alumina substrates for die attachment.

This new material system combines Heraeus’ premium metal ceramic substrate with flux-free solder pads that have already been pre-applied. This simplifies the die soldering process dramatically since solder paste printing and flux residue cleaning are not required. Furthermore, since the solder material is just a metallic alloy and does not contain any solvent, solder splattering is avoided.

The special solder pads are positioned precisely at the correct location and are available in variable forms and volumes matching to the module design. Fixation dots deposited on the solder pads ensure that the dies do not move after placement. Upon reflow, the fixation material vaporizes without leaving any residue.

Heraeus’ highly trained field service engineers work closely with you to implement efficiently the pre-applied solder Condura®+ in your actual die attach process flow. In our application center, we support you from the design of your layout, through prototyping and testing, up to qualification. Contact us, we speak your language and understand your requirements.

Advantages at a glance:

Faster, more efficient, cost saving production process:

  • 50 % fewer process steps for die soldering, since solder printing and cleaning step are not required
  • Lower investment in equipment and cleaning materials, resulting in production cost savings
  • Improved yield, through less rejected goods due to splatter and damage during the cleaning process
  • Less reflow oven maintenance costs due to less contaminations with solder residues

Your benefits in working with Heraeus:

  • Exactly the right solution for your application, adapted to your needs
  • Quicker time to market due to unique expertise of matching materials to systems with maximum performance and reliability
  • High innovation capabilities
  • With our in-house application center we are able to:
    • Perform the complete module back-end assembly
    • Build prototypes of electronic modules
    • Run tests at module level as our customers do

Power electronics in industrial use:

Our Condura®+ substrates are recommended for power electronic modules (e.g. current inverters) using MOSFETs or IGBT semiconductor elements and diodes for widespread application fields in the industrial sector: electric motor drives, e.g. in tooling machines, cranes, textile-processing equipment, automation equipment, etc.

  • Pumps
  • Welding machines
  • Electrical industrial vehicles (e.g. power drives for forklifts)
  • Induction heating
  • Industrial drives (e.g. escalators, conveyor belts, elevators, robots, and servo drives)
  • Uninterruptable power supply to. data centers, hospitals, etc.
  • Drillings for natural resources (e.g. oil and gas)
  • Energy technology (e.g. photovoltaics, wind turbines, and energy distribution)
  • White goods (e.g. air conditioners, washing machines, refrigerators, and warm water pumps)

Automotive and traction:

As high-performance circuit carriers for power electronic applications:

  • In such groups as power steering, start-stop systems, air conditioning compressors, water pumps, oil pumps, brakes, etc.
  • Converters for hybrid or electrical power train
  • Battery chargers
  • Inductive charging systems
  • DC-DC converters
  • Rail vehicles such as locomotives, subway trains, trams and cable cars, etc.


  • Uninterruptable power supply (UPS) to telecommunication centers (e.g. RF amplification systems)

Further markets:

There are many examples of further markets in which DCBs are already being applied, such as medical technology (MRT, CRT), aerospace, radar systems, heavy building machinery, and looking towards the future, increasingly in agricultural vehicles and aircraft.

Alumina Condura®+ substrate

  • Alumina ceramic Al2O3 (96%)
    Thicknesses: 0.25mm/0.32mm/0.38mm/0.63mm
  • Direct Copper Bonding Cu-OFE
    Thicknesses: 0.2 mm/0.25 mm/0.3 mm/0.4 mm
  • Single Unit or Master Card size 7-" x 5-" (usable area)
  • Surface finish: bare Cu (others to be agreed)
  • No visible splatter

Find more technical details  here .

Solder pads

  • Alloy: SnAg3.5, SAC 305, other alloys to be agreed
  • Size: based on customer requirements
  • Thickness: based on customer requirements, typically ≤ 60 μm after die attach

Various solder material thicknesses and areas can be placed on the substrate

Fixation dot

Vaporizes without leaving any residue (checked with Auger spectroscopy and bonding wire pull & shear tests)


  • Metallization: Solderable functional surface: e.g. Ag or Au
  • Size: based on customer requirement

Die soldering

  • Process: Reflow in active atmosphere (e.g. formic acid CH2O2). We can support you to design your process conditions such as reflow oven profiling.
  • Total void rate: ≤ 5 % of the wetted area
  • Max. void size: ≤ 0.5 % of wetted area
  • Splatter: no splatter visible
  • Residue cleaning: not required