Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1995-12-09
1996-11-19
Sparks, Donald A.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
174252, 174257, 174260, 361763, 361764, 361719, 361720, H05K 118, H05K 720
Patent
active
055769349
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a mounting unit for a multilayer hybrid circuit.
BACKGROUND INFORMATION
The present invention starts out from a mounting unit for a multilayer hybrid circuit. Multilayer hybrids having power components have already been disclosed by the German unexamined Patent Application No. 40 31 733. Multilayer hybrids having power components, especially ICs, are used therein, the power components being mounted, for example, on the top side of the hybrid, and their waste heat being dissipated through somewhat costly designs, by means of cooling plates, heat sinks, or cooling springs. In addition, it discloses introducing power ICs into indentations formed on the back side of the multilayer hybrid, for example, so as to allow the multilayer hybrid to be mounted with its rear side over the full surface on a substrate board. In this case, heat can accumulate at those locations where a power component is mounted on the rear side, since the heat generated is not optimally dissipated through the substrate board.
SUMMARY OF THE INVENTION
In comparison, the arrangement according to the present invention has the advantage of enabling heat to dissipate directly through the substrate board, for example, to a package (housing) mounting base. Another advantage to be considered is that by assembling the power components on the rear side, one can dispense with metal-filled channels, thus making more wiring area available in a plurality of conducting track planes of the multilayer hybrid circuit.
Advantageous further developments and improvements of the multilayer hybrid circuit are possible. It is particularly advantageous to use a ceramic board that is coated on both sides with copper and to provide it with recesses, so that the copper film is tented (stretched) over these recesses and is first pressed into the appropriate indentations when the hybrid is mounted. Thus, an exact adaptation to the various chip thicknesses is possible. A further advantage is that the copper film can be designed at the edge of the substrate board as a projecting lead frame, thus enabling it to be bonded on the one hand to the hybrid and, on the other hand, to a fixed connector. Finally, it is possible to pattern the copper film on the ceramic carrier so as to allow connections to lead away or toward various locations on the multilayer hybrid circuit. In this case, it is particularly advantageous that the connections are able to be designed as low-resistance connections.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a substrate board according to the present invention having a copper/ceramic/copper layer sequence.
FIG. 2 shows a substrate board according to the present invention with an assembled multilayer hybrid circuit.
FIG. 3 shows a substrate board according to the present invention having a ceramic/copper/ceramic layer sequence.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 illustrates the substrate board 1, on which a multilayer hybrid circuit is mounted. This substrate board 1 consists of a ceramic board 2, which is about 0.3 to 2 mm thick. This ceramic board 2 is coated on both sides with a copper film 3. The ceramic board 2 can have indentations 4, which are then tented by the copper films 3.
FIG. 2 depicts the substrate board 1 with the multilayer hybrid circuit 5 mounted on. Such a multilayer hybrid 5 usually consists of ceramic, with various components, such as resistors and capacitors, being introduced into different layers. The leads of the multilayer hybrid circuit 5 are connected via wires 6 to outer leads (not shown) outside of the multilayer hybrid circuit or to various conducting tracks of the patterned copper film 3. Two power semiconductor components in IC design are secured in various ways to the multilayer hybrid circuit 5. Thus, a power IC 7 is mounted on the top side of the multilayer hybrid circuit and is contacted by means of bonding wires 8 by conducting tracks on the top side of the multilayer hybrid circuit 5. To dissipate its heat to the substrate board 1
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IBM Technical Disclosure Bulletin "Direct Capacitor Attachment for Logic Chips" vol. No. 3A Aug. 1990.
Goebels Ulrich
Roethlingshoefer Walter
Robert & Bosch GmbH
Sparks Donald A.
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