摘要:
A device comprising a semiconductor chip (110) having a side edge (111) and a plurality of metal bond pads (120, 121) near the edge; the pads are aligned to form rows (130, 131) parallel to the edge. The device further includes a leadframe (100) having leads oriented with one end towards the chip edge and spaced from it by a gap (150); the chip is attached to the leadframe. Ends of selected leads are connected by a metal cross bar (160) parallel to the chip edge. Substantially parallel bond wires (170) are crossing the gap to connect each chip pad either to the crossbar or to a non-selected lead end. In a preferred lead arrangement, the selected leads alternate with non-selected leads.
摘要:
An apparatus (100) and method for bonding a wire, such as a flat rectangular cross sectioned ribbon wire (104), to a workpiece (106) in semiconductor device fabrication. The wire is fed through a passageway (116) of an ultrasonic bond capillary (102) and clamped against an engagement surface (120) of the bond capillary via a clamping jaw (118) operably coupled to the bond capillary. The wire is bonded to the workpiece along a bonding surface (112) of the bond capillary and penetrated, at least partially, between the bonding surface and the engagement surface of the bond capillary by a cutting tool (124). The cutting tool may comprise an elongate member (126) positioned between the bonding surface and engagement surface, and may have a cutting blade (128) positioned at a distal end (130) thereof. The cutting tool may further comprise a ring cutter, wherein the ribbon wire passes through a ring having a cutting surface defined about an inner diameter thereof.
摘要:
A high current semiconductor device (for example QFN for 30 to 70 A) with low resistance and low inductance is encapsulated by molding compound (401, height 402 about 0.9 mm) so that the second lead surfaces (110b) remain un-encapsulated. A copper heat slug (404) may be attached to chip surface (101b) using thermally conductive adhesive (403). Chip surface (101a), protected by an overcoat (103) has metallization traces (102). Copper-filled windows contact the traces and copper layers (105) parallel to traces. Copper bumps (108) are formed on each line in an orderly and repetitive arrangement so that the bumps of one line are positioned about midway between the bumps of the neighboring lines. A substrate has elongated leads (110) oriented at right angles to the lines; the leads connect the corresponding bumps of alternating lines.
摘要:
A method for fabricating a low resistance, low inductance device for high current semiconductor flip-chip products. A structure is produced, which comprises a semiconductor chip (101) with metallization traces (102), copper lines in contact with the traces, and copper bumps located in an orderly and repetitive arrangement on each line so that the bumps of one line are positioned about midway between the corresponding bumps of the neighboring lines. A substrate is provided which has elongated copper leads with first and second surfaces, the leads oriented at right angles to the lines. The first surface of each lead is connected to the corresponding bumps of alternating lines using solder elements.- Finally, the assembly is encapsulated in molding compound so that the second lead surfaces remain un-encapsulated.
摘要:
An apparatus (100) and method for bonding a wire, such as a flat rectangular cross sectioned ribbon wire (104), to a workpiece (106) in semiconductor device fabrication. The wire is fed through a passageway (116) of an ultrasonic bond capillary (102) and clamped against an engagement surface (120) of the bond capillary via a clamping jaw (118) operably coupled to the bond capillary. The wire is bonded to the workpiece along a bonding surface (112) of the bond capillary and penetrated, at least partially, between the bonding surface and the engagement surface of the bond capillary by a cutting tool (124). The cutting tool may comprise an elongate member (126) positioned between the bonding surface and engagement surface, and may have a cutting blade (128) positioned at a distal end (130) thereof. The cutting tool may further comprise a ring cutter, wherein the ribbon wire passes through a ring having a cutting surface defined about an inner diameter thereof.