April: Inlay Board technology

Inlay Board Thermography of a smart battery switch carrying 400 A permanent current
(in collaboration with Infineon Technologies AG).


What is the maximum current that can be conducted by an Inlay Board?

This depends on the possible conductor cross-section. At a maximum inlay thickness of 2.0 mm, continuous currents of 600 A and peak currents of 1,200 A are achievable. In  each case, the exact value depends, of course, on the ambient conditions and the admissible power loss.

How can contact be made with an Inlay Board?

Inlay Boards are highly variable in terms of the contacting type. A partial exposure of contact surfaces allows screws and terminals to be attached and hard soldering or welding to be carried out. The use of press-in contacts is also common.

What inlay thicknesses are possible?

Depending on the application requirements, standard thicknesses of 1.0 mm, 1.5 mm and 2.0 mm are available.

What forms and sizes can be mapped as inlay?

Forming is quite variable and can be adjusted to individual application requirements. Depending on the dimension and complexity of the inlay parts, different solutions are available. We will be glad to advise you on the best solution for your application.

Can an Inlay Board be laid up electrically insulated to make mounting toward the heat sink more  economical?

Basically, Inlay Boards exist in three different design versions:

1. Open inlay - not insulated toward the heat sink.
2. Embedded inlay - with electrical and thermal connection to the outer layer via microvias.
3. Embedded inlay - insulated with thermally conductive dielectric.

What functions can an inlay perform in a printed circuit board?

1. Conducting high currents
2. Dissipating and discharging power losses
3. Counterpart for variable connection technology

How do printed circuit boards with pressed-in coins differ from the SCHWEIZER Inlay Board?

Copper coins are only used for discharging power losses, thus performing only part of the function of the Inlay technology. Coins are pressed into end-to-end printed circuit board holes and are usually round or rectangular in shape. The advantages of this technology are that they are usually low-cost and also allow contact to be made with inner layers. Compared with that, the Inlay Board has the advantage that the absence of a size limit allows heat dissipation over a large surface area. Since inlays can be laminated into the printed circuit board, no disruptions of the printed circuit board material can be caused by the pressing process, possibly limiting reliability. Compared with that, Inlay Boards have coplanar top and bottom sides simplifying the component assembly process.