ELECTRONIC SUBASSEMBLY AND ELECTRONIC ASSEMBLAGE

Abstract

An electronic subassembly encompassing at least one carrier substrate, an electronic circuit being embodied on at least one carrier substrate surface. The electronic subassembly encompasses at least one mechanical connecting boss that is connected, in a substrate connection region, to at least one of the carrier substrate surfaces. The connecting boss, conversely, has, on a side facing away from the substrate connection region, a terminating boundary layer which is made of a metal oxide and which is embodied to furnish an adhesive bonding surface for an adhesive layer in order to constitute an adhesively bonded composite assemblage with a join participant.

Claims

1-15. (canceled)

16. An electronic subassembly, comprising: at least one carrier substrate having carrier substrate surfaces; an electronic circuit embodied on at least one of the carrier substrate surfaces; and at least one mechanical connecting boss that is connected, in a substrate connection region, to at least one of the carrier substrate surfaces, the connecting boss having, on a side facing away from the substrate connection region, a terminating boundary layer which is made of a metal oxide and which is embodied to furnish an adhesive bonding surface for an adhesive layer to constitute an adhesively bonded composite assemblage with a join participant.

17. The electronic subassembly as recited in claim 16, wherein the connecting boss is constituted substantially, or at least in portions on a side facing toward the furnished adhesive bonding surface from aluminum or from an aluminum alloy.

18. The electronic subassembly as recited in claim 17, wherein the connecting boss is constituted from an aluminum oxide.

19. The electronic subassembly as recited in claim 17, wherein the connecting boss has, at least on the side facing toward the substrate connection region, an applied adhering metallization that is made of Cu or Ag or Ni or Au, or an alloy of Cu or an alloy of Ag or an alloy of Ni or an alloy of Au.

20. The electronic subassembly as recited in claim 19, wherein the metallization is applied by electroplating or is applied as a roll-bonded metal sheet.

21. The electronic subassembly as recited in claim 19, wherein the metallization is applied by electroplating using silver, or is applied as a roll-bonded copper sheet.

22. The electronic subassembly as recited in claim 16, wherein the connecting boss is connected to the carrier substrate using a solder layer or a sintered layer in the substrate connection region, the connecting boss having, at least in the substrate connection region, a solderable and/or sinterable boundary layer that terminates toward the solder layer or the sintered layer.

23. The electronic subassembly as recited in claim 16, wherein the connecting boss is connected to the carrier substrate in the substrate connection region using a nonpositive and/or positive connection.

24. The electronic subassembly as recited in claim 16, wherein the connecting boss is connected to the carrier substrate in the substrate connection region using a press-in contact.

25. An electronic assemblage, comprising: at least one first electronic subassembly including: at least one carrier substrate having carrier substrate surfaces, an electronic circuit embodied on at least one of the carrier substrate surfaces, and at least one mechanical connecting boss that is connected, in a substrate connection region, to at least one of the carrier substrate surfaces, the connecting boss having, on a side facing away from the substrate connection region, a terminating boundary layer which is made of a metal oxide and which is embodied to furnish an adhesive bonding surface; and the join participant connected, in a connection region, at least to the connecting boss by way of an adhesive layer immediately adjacent to the furnished adhesive bonding surface.

26. The electronic assemblage as recited in claim 25, wherein the join participant is a housing part.

27. The electronic assemblage as recited in claim 25, wherein the join participant is at least a second electronic subassembly, the second subassembly including at least one carrier substrate having carrier substrate surfaces, an electronic circuit embodied on at least one of the carrier substrate surfaces, and at least one mechanical connecting boss that is connected, in a substrate connection region, to at least one of the carrier substrate surfaces, the connecting boss having, on a side facing away from the substrate connection region, a terminating boundary layer which is made of a metal oxide and which is embodied to furnish an adhesive bonding surface, wherein the first and second electronic subassemblies are disposed one above another and a connection region between two mutually facing adhesive bonding surfaces of the first and second electronic subassemblies are constituted respectively by the connecting boss of the first and of the second electronic subassembly.

28. The electronic assemblage as recited in claim 27, wherein the two adhesively bonded connecting bosses are respectively connected to substrate surfaces of the carrier substrates of the first and of the second electronic subassembly which are disposed parallel to one another.

29. The electronic assemblage as recited in claim 27, wherein the electronic circuits of the first and of the second electronic subassembly are electrically connected to one another by way of at least one electrically conductive connecting element.

30. The electronic assemblage as recited in claim 29, wherein the first electronic subassembly has a power circuit and the second electronic subassembly has a circuit for applying control to the power circuit.

31. The electronic assemblage as recited in claim 29, wherein the electrically conductive connecting element is a bonding wire or bonding ribbon.

32. The electronic assemblage as recited in claim 31, wherein the carrier substrates of the first and of the second electronic subassembly are disposed in parallel fashion one above another, and a first bond connection point of the electrically conductive connecting element is embodied on a first substrate surface of the carrier substrate of the second electronic subassembly which faces away from the substrate connection region, such that in a projection of a plan view onto the first substrate surface, the first bond connection point is disposed laterally inside the substrate connection region of the carrier substrate of the first and/or of the second electronic subassembly.

33. The electronic assemblage as recited in claim 32, wherein a second bond connection point of the electrically conductive connecting element is embodied on a second substrate surface of the carrier substrate of the first electronic subassembly which faces toward the substrate connection region, such that in a plan view of the first bond connection point, the second bond connection point is disposed in freely accessible fashion for a bonding tool, with a lateral offset from an outer edge of the carrier substrate of the second electronic subassembly.

34. The electronic assemblage as recited in claim 33, wherein the first bond connection point encompasses a contact pad of the carrier substrate of the second electronic subassembly, and the second bond connection point encompasses a contact pad of the carrier substrate of the first electronic subassembly or an upper contact terminal of a power semiconductor disposed on the carrier substrate of the first electronic subassembly.

35. The electronic assemblage as recited in claim 33, wherein the carrier substrate of the second electronic subassembly has at an edge at least one cutout open on one side or on two sides, such that in a projection of a plan view of a bonded substrate surface of the carrier substrate of the second electronic subassembly, the second bond connection point is disposed laterally inside the cutout.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Further advantages, features, and details of the present invention are evident from the description below of preferred exemplifying embodiments and with reference to the figures.

[0024] FIG. 1 is a lateral section view of an electronic assemblage encompassing at least one electronic subassembly and a join participant adhesively bonded to it, in accordance with an example embodiment of the present invention.

[0025] FIG. 2 is a plan view of the electronic assemblage of FIG. 1.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0026] In the Figures, functionally identical components are labeled in each case with identical reference characters.

[0027] FIG. 1 is a lateral section view of an exemplifying embodiment of an electronic assemblage 100. Electronic assemblage 100 encompasses at least one electronic subassembly 100′ having a carrier substrate 10.1, 10.2 populated on at least one side, and a join participant 100″ connected by way of an adhesively bonded connection to electronic subassembly 100′. What is shown in particular is an exemplifying embodiment in which a first electronic subassembly 101 and a second electronic subassembly 102 are disposed one above another, so that carrier substrate surfaces 10.1′, 10.2′ of the respective electronic subassemblies 101, 102 face one another with a parallel spacing from one another. The mutually facing carrier substrate surfaces 10.1′, 10.2′ have at least one connecting boss 20 which projects from carrier substrate surface 10.1′, 10.2′ and is connected, for example by way of a solder layer 11 or a sintered layer 11′, to the respective carrier substrate 10.1, 10.2 in a substrate connection region 10.15, 10.25. Alternatively, a fixed connection exists by way of a press-in contact 12, for example encompassing a press-in pin 12.1 and a press-in orifice 12″ which are respectively shaped on and out of connecting boss 20 and carrier substrate 10.1, 10.2 in complementary fashion to one another (depicted by way of example in FIG. 1 in the electronic assemblage at the two outer right-hand connecting bosses 20). The respective end regions of two connecting bosses 20 of the first and the second electronic subassembly 101, 102 are located opposite one another in a connection region 50. These end regions facing one another each have a terminating boundary layer made of a metal oxide, which is embodied to furnish an adhesive bonding surface 22 for an adhesive layer 30 in order to constitute an adhesively bonded composite assemblage with a join participant. The two adhesive bonding surfaces 22 of the two connecting bosses 20 are connected to one another by way of an adhesive layer 30 that is adjacent to them and adheres fixedly to them. In the present exemplifying embodiment, three adhesively connected complementary connecting bosses 20 are shown in the section view. Alternatively, more or fewer pairs can be provided in application-specific fashion. The connecting bosses are preferably constituted from an aluminum, an aluminum alloy, or an aluminum oxide. A boundary layer having an oxide necessary for the adhesive connection is thus ensured in connection region 50. In substrate connection region 10.15, 10.25, the respective connecting boss 20 has an additional metallization 21 made, for example, of Ag, Cu, Ni, Au, or an alloy thereof. In particular, metallization 21 has at least one sinterable and/or solderable boundary layer. Metallization 21 is applied, for example, by electroplating. Alternatively, a copper sheet constituting metallization 21 can be connected by roll-bonding to the aluminum-containing core of connecting boss 20 in substrate connection region 10.15, 10.25. The copper sheet then alternatively has a respectively shaped-out or shaped-on press-in pin 12′ or press-in orifice 12″. In principle, connecting boss 20 can also be made of any, in particular metallic, core material that has a sinterable and/or solderable coating in substrate connection region 10.15, 10.25, and an adhesively bondable coating, made of a metal oxide, in connection region 50.

[0028] First and second electronic subassembly 101, 102 each have an electronic circuit 115, 125. The latter are electrically connected to one another by way of at least one electrically conductive connecting element 40, in particular a bonding wire or a bonding ribbon. First electronic subassembly 101 preferably has a power circuit 115 having at least one power semiconductor 15 that is disposed, for example soldered or sintered, on a DBC, AMB, IMS, LTCC, or HTCC substrate 10.1. Also preferably, second electronic subassembly 102 has a circuit 125 for control application to power circuit 115, having at least one soldered or sintered electrical and/or electronic component 25. Electrical and/or electronic component 25 is disposed in particular on a circuit board constituting carrier substrate 10.2, for example a standard F4 circuit board. A first bond connection point 61 of electrically conductive connecting element 40 is embodied on that substrate surface 10.2″ of carrier substrate 10.2 of second electronic subassembly 102 which faces away from substrate connection region 10.25. First bond connection point 61 is disposed directly above the adhesively connected connecting bosses 20, so that mechanical forces acting in the context of a bonding process can be absorbed in supporting fashion. The bonded connection is made, for example, on a metallic contact pad that is provided for the purpose and is embodied structurally identically or structurally similarly to an electrical conductor structure disposed on carrier substrate surface 10.2′.

[0029] A second bond connection point 62 of electrically conductive connecting element 40 is embodied, conversely, on that substrate surface 10.1′ of carrier substrate 10.1 of first electronic subassembly 101 which faces toward substrate connection region 10.15. In this exemplifying embodiment, the bonded connection is made to an upper contact terminal of a power semiconductor 15 disposed on carrier substrate 10.1 of first electronic subassembly 101. Alternatively, a bonded connection can also be made to a contact path, similarly or identically to the case with first bond connection point 61. As depicted in FIG. 1, the two circuits 115, 125 can be connected to one another with more than one connecting element 40.

[0030] FIG. 2 is a plan view of the electronic assemblage of FIG. 1. It is evident that in a projection of the plan view onto carrier substrate surface 10.2″, first bond connection point 61 is disposed laterally inside the respective substrate connection region 10.15, 10.25 of carrier substrate 10.1, 10.2 of first and/or second electronic subassembly 101, 102. It is additionally evident that in a plan view of first bond connection point 61, second bond connection point 62 is disposed, with a lateral offset from an outer edge of carrier substrate 10.2 of second electronic subassembly 102, in freely accessible fashion, in particular freely accessibly to a bonding tool 200 (depicted with dashed lines). In order to implement a compact electronic subassembly 101, 102, in this exemplifying embodiment carrier substrate 10.2 of second electronic subassembly 102 has at the edge at least one cutout 70 open on one side or on two sides. In a projection of the plan view onto the bonded carrier substrate surface 10.2′ of carrier substrate 10.2 of second electronic subassembly 102, it is evident that second bond connection point 62 is disposed laterally inside cutout 70.

[0031] A further embodiment of an electronic assemblage 100 is obtained from the fact that one electronic subassembly 100′ is no longer connected, as already described, to another electronic subassembly 100′ but is now connected to another join participant 100″, the other join participant 100″ having an adhesively bondable joining surface. The latter can in turn be furnished by a connecting boss 20 that is embodied in one piece with, or connected to, join participant 100″. FIG. 1 therefore shows a further electronic assemblage 100 in which, for example, electronic subassembly 102 is structurally adhesively bonded not to electronic subassembly 102 but instead to a housing part 80. The housing part is preferably made of aluminum or an aluminum alloy, so that connecting bosses shaped or disposed there have a boundary layer of aluminum oxide. Alternatively, in the context of a different housing material, corresponding connecting bosses 20 can be provided which form an adhesively bonded composite assemblage pairwise with a connecting boss 20 of second electronic subassembly 102.

[0032] Generally, adhesive can be applied, for example by way of a dispensing operation, onto adhesive bonding surface 22 on the connecting boss of one of join participants 101, 102, 70. The other join participant 101, 102, 70 can then be brought, for example by a handling apparatus, into a configuration in which connecting bosses 20 of the respective join participants 101, 102, 70 are located with their adhesive bonding surfaces 22 pairwise opposite one another, and are respectively wetted by the adhesive to form the adjoining adhesive layer 30. A load-transferring adhesive connection is produced as soon as the adhesive has cured.