Abstract:
A contact (11) for a semiconductor device (10) or passive substrate is made up of an array of conductive balls (12), the individual balls (12) of the contact (11) being a compressible material coated with a metal conductive material. The balls (12) in the array are compressed while being bonded to the contact area to provide a larger bond area between the ball (12) and the contact area to which it is bonded.
Abstract:
The invention is to an apparatus and method for testing and burn-in of bare semiconductor chips. A molded chip carrier (10) of a high temperature plastic is utilized as a temporary holder for the chip. The carrier also has three alignment holes (15, 16, 119) that correspond to the alignment pins (24, 25, 27) in a test socket (20). The contact pads on the chip are aligned to contacts in the test socket (20) utilizing the alignment holes and pins. Before starting the testing and burn-in process, the carrier (10) with a chip is loaded into the socket (20), with the contact pads on the chip facing the tips of the contact elements in the socket. The carrier (10) is inserted into the socket (20) using the alignment pins (24, 25, 27) and holes (15, 16, 19) as guides. Clamping force is applied by the lid to ensure that the contacts of the socket maintain adequate contact force with the device contact pads during burn-in and testing. After burn-in and testing, the carrier (10) with the chip attached to it is removed from the socket (20).
Abstract:
A chip-on-board assembly and a method of making is described in which semiconductor chips (32) having center contacts (35) are mounted active side down on the circuit board (31) with the center contacts (35) centered in an elongated opening (33) in the circuit board (31). The center contacts (35) are connected through the openings (33) in the circuit board (31) to contacts (34) on the circuit board (31) on the opposite side of the circuit board (31) on which the semiconductor chip (32) is mounted. Semiconductor chips (32) are alternately mounted on opposite sides of the circuit board (31) to provide a higher placement density of semiconductor chips.
Abstract:
An interconnection system and method of testing and performing burn-in semiconductor devices (12) prior to separation from the semiconductor wafer on which the devices are formed includes forming interconnection layers of contacts (16) and conductors (17) over the devices and then testing and performing burn-in on the devices. Faulty devices are disconnected from the conductors prior to performing additional test and burn-in. The interconnections are removed prior to separating the device on the wafer, and prior to further possible tests and packaging.
Abstract:
A microelectronic device (10) provides V DD bus 28, contacts 30 and V SS bus 32 disposed in the center portions of semiconductor die (12). Some contacts (30) may be selectively contacted to V DD bus (28) and V SS bus 32 via connective portions (38). A lead finger (16') makes electrical connection with contact (30) by advantageously overlying V DD bus (28) at notch (80) so as to avoid shorting thereto. Thus, integral electrical connection is made to three center terminal groups without resorting to wire bonding techniques to overlie outermost V DD bus (28) and V SS bus (32).