Package for power semiconductor chips
First Claim
1. In a method of packaging at least one semiconductor chip wherein a first surface of the chip is bonded to a base, the base being attached to a frame, and the frame attached to a lid to enclose the chip, the chip having at least one contact pad on its second surface, the improvement in the packaging method comprising:
- providing as the lid a planar, rigid, insulating, substrate having at least one conductive pattern layer on a first surface facing the chip;
forming at least one soft, ductile, metal protuberance on at least one conductor of the conductive pattern layer on the first surface of the lid, andconnecting the conductive pattern of the lid to the chip by metallurgically bonding the protuberances to contact pads of the chip number of protuberances bonded to a contact pad being sufficient to minimize the contact resistance and the power lost as heat (I2 R) between the chip and the lid, and minimize the current density on the surface of the chip.
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Accused Products
Abstract
An electronic packaging module for bonding of power semiconductor devices is produced. The semiconductor device is mounted on a base, and enclosed by a frame and lid. The lid is an insulating substrate having a conductive pattern with protuberances on the conductive pattern of the substrate. The protuberances are of a soft, ductile metal capable of being metallurgically bonded to the metallization pads of semiconductor devices. The metal protuberances are bonded to the semiconductor device joining it to the lid, and through the conductive pattern of the lid connecting the device to the input/output contacts of the package.
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Citations
30 Claims
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1. In a method of packaging at least one semiconductor chip wherein a first surface of the chip is bonded to a base, the base being attached to a frame, and the frame attached to a lid to enclose the chip, the chip having at least one contact pad on its second surface, the improvement in the packaging method comprising:
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providing as the lid a planar, rigid, insulating, substrate having at least one conductive pattern layer on a first surface facing the chip; forming at least one soft, ductile, metal protuberance on at least one conductor of the conductive pattern layer on the first surface of the lid, and connecting the conductive pattern of the lid to the chip by metallurgically bonding the protuberances to contact pads of the chip number of protuberances bonded to a contact pad being sufficient to minimize the contact resistance and the power lost as heat (I2 R) between the chip and the lid, and minimize the current density on the surface of the chip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. In a method of packaging a semiconductor chip wherein the chip is bonded to an inorganic base and enclosed by an inorganic frame and lid, a first surface of the chip being bonded to the base, and the chip having at least one contact pad on a second surface, the improvement comprising:
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providing as the lid a planar, insulating, inorganic substrate, capable of being bonded to the frame, the lid having at least one conductive pattern layer on a first surface facing the chip; forming at least one soft, ductile, metal protuberance on at least one conductor of the conductive pattern layer on the first surface the lid; connecting the conductive pattern layer on the first surface of the lid to the chip by metallurgically bonding at least one protuberance to a contact pad of the chip, the number of protuberances bonded to a contact pad being sufficient to minimize the contact resistance and the power lost as heat (I2 R) between the chip and the lid, and bonding the lid and base to the frame to enclose the chip in an inorganic package. - View Dependent Claims (20, 21, 22)
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23. In a method of packaging a semiconductor chip wherein a contact area of the chip is electrically connected to a conductive pattern on a rigid, planar, insulating substrate, the improvement comprising:
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forming a plurality of soft, ductile metal protuberances on the conductive pattern of the insulating substrate; placing the protuberances of the insulating substrate against the chip and metallurgically bonding the protuberances to the contact areas of the chip with multiple protuberances bonding to a contact area, the number of protuberances bonding to a contact area being sufficient to minimize contact resistance, power lost as heat (I2 R) and to minimize the current density on the surface of the chip. - View Dependent Claims (24)
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25. A method for packaging a plurality of semiconductor devices in a unitary package comprising:
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providing a plurality of semiconductor chips, each chip having at least one semiconductor device; bonding a first surface of each chip to a base, each chip having at least one contact pad on a second surface; surrounding the chips by at least one frame; providing a rigid, planar, insulating substrate as a common lid for the package; forming a conductive pattern on the insulating substrate, the conductive pattern having at least one conductive pattern layer; forming a plurality of soft, ductile metal protuberances on the conductive pattern layer; metallurgically bonding the protuberances to contact pads on the second surfaces of the plurality of chips, the number of protuberances bonding to a contact pads being sufficient to minimize contact resistance and power lost as heat (I2 R) between the chip and the lid, and minimize the current density on the surface of the chip, and sealing the frame surrounding chips to the base and the common lid to enclose the semiconductor devices in a unitary package. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification