This disclosure relates generally to electronic system fabrication, and more specifically to an integrated circuit chip fabrication leadframe.
Integrated circuits (ICs) can be fabricated in a process in which a wafer is cut into multiple dice that are each provided in an IC package, with the IC package including conductive chip-pins that provide inputs and outputs for the IC. The conductive chip-pins can be trimmed from a conductive leadframe on which the dice are provided. During an IC packaging process, the ICs can be engineered for flexible package trim and form followed by a massively parallel test using strip handlers. The parallel testing of the ICs occurs after the conductive-chip pins are trimmed from the conductive leadframe to ensure electrical isolation of the chip-pins with respect to each other. As an example, in some IC fabrication processes, only a single chip-pin can remain coupled to the conductive leadframe during a test, with such single chip-pin being trimmed from the conductive leadframe after the test to remove the resultant IC chip from the conductive leadframe. For example, the single conductive leadframe can correspond to a ground connection for the IC, such that the conductive leadframe can be grounded during the parallel test.
One example includes a conductive leadframe configured to couple to an integrated circuit (IC) chip die on a contact surface of the IC chip die. The conductive leadframe includes a plurality of chip-pin connections configured to conductively couple to bond pads of the IC chip die via conductive lead wires. The conductive leadframe also includes a support beam that extends across the conductive leadframe along the contact surface of the IC chip die to enable support of the IC chip die to the conductive leadframe at a plurality of support locations during testing of the IC associated with the IC chip die.
Another example includes a conductive leadframe configured to couple to an IC chip die on a contact surface of the IC chip die. The conductive leadframe includes a plurality of chip-pin connections configured to conductively couple to bond pads of the IC chip die via conductive lead wires. The conductive leadframe further includes a support beam that extends across the conductive leadframe along the contact surface of the IC chip die between a first edge of the IC chip die and a second edge of the IC chip die opposite the first edge to enable support of the IC chip die to the conductive leadframe at a junction of the contact surface and the first edge and at a junction of the contact surface and the second edge during testing of the IC associated with the IC chip die.
Another example includes a leadframe system comprising a plurality of conductive leadframes that are arranged in an array and are fabricated from a unitary conductive material with respect to the array and which are configured to couple to a respective plurality of IC chip dice on a contact surface of the IC chip die. Each of the plurality of conductive leadframes includes a plurality of chip-pin connections configured to conductively couple to bond pads of the IC chip die via conductive lead wires. The leadframe system further includes a support beam that extends across the respective one of the plurality of conductive leadframes along the contact surface of the IC chip die to enable support of the IC chip die to the respective one of the plurality of conductive leadframes at a plurality of support locations during testing of the IC associated with the IC chip die.
This disclosure relates generally to electronic system fabrication, and more specifically to an integrated circuit chip fabrication leadframe. The leadframe corresponds to a conductive leadframe that can be implemented in fabrication of an integrated circuit (IC) chip to provide chip-pins for the resultant IC chip package. The conductive leadframe can be formed from a unitary conductive material, and can be provided in an array of conductive leadframes for fabrication of a plurality of IC chips, such that the array of conductive leadframes can be collectively formed from the unitary conductive material.
The conductive leadframe includes chip-pin connections that can be electrically coupled to the IC chip die via conductive lead wires that connect the chip-pin connections to bond pads associated with the IC chip die. The chip-pin connections can subsequently be mechanically trimmed from the conductive leadframe to form the chip-pins of the resultant IC chip package. As an example, the IC chip die can contact the conductive leadframe on a contact surface (e.g., bottom surface), such that the chip-pins can extend orthogonally with respect to edges of the IC chip die, with the edges forming orthogonal edges of the contact surface. The chip-pin connections can thus be mechanically trimmed from the conductive leadframe to facilitate testing of the IC, such as via a strip handler. As an example, the strip handler can implement parallel testing of a plurality of ICs by providing conductive contact with the resultant chip-pins of each of the ICs concurrently and implementing a test protocol on each of the ICs concurrently.
The conductive leadframe also includes a support beam that extends along the contact surface across a length of the IC chip die, such as between a first edge of the IC chip die and a second edge of the IC chip die opposite the first edge. The support beam thus provides supporting of the IC chip die during testing of the IC subsequent to the trimming of the chip-pin connections from the conductive leadframe. As an example, the support beam can be coupled to one of the chip-pin connections that remains untrimmed during the testing of the IC. Therefore, the IC chip die can be supported at three support locations during the testing of the IC. One of the support locations can be associated with the untrimmed one of the chip-pin connections (e.g., a ground connection), while the other two support locations can be associated with opposite ends of the support beam proximal to the first and second edges of the IC chip die. Accordingly, based on the IC chip die having multiple supporting points during testing of the IC, parallel testing of multiple ICs can occur with mitigation of pivoting of the IC chip die resulting in loss of conductive contact, such as can occur in typical IC parallel testing in which the IC chip die is supported at only a single supporting point.
The conductive leadframe 10 includes chip-pin connections 12 and a support beam 14. The chip-pin connections 12 can be electrically coupled to an IC chip die that is associated with the resulting IC chip package, such as via conductive lead wires that connect the chip-pin connections 12 to bond pads associated with the IC chip die. The chip-pin connections 12 can subsequently be mechanically trimmed from the conductive leadframe 10 to form the chip-pins of the resultant IC chip package. As an example, the IC chip die can contact the conductive leadframe 10 on a contact surface. As described herein, the term “contact surface” with respect to the associated IC chip die corresponds to a flat, broad surface of the IC chip die that is in contact with the conductive leadframe 10 (e.g., a bottom surface).
Therefore, the chip-pins that result from the trimmed chip-pin connections 12 can extend orthogonally with respect to edges of the IC chip die. The chip-pin connections 12 can thus be mechanically trimmed from the conductive leadframe 10 to facilitate testing of the resulting IC, such as via a strip handler. As described herein in greater detail, the strip handler can implement parallel testing of a plurality of ICs by providing conductive contact with the resultant chip-pins and implementing a test protocol on each of the ICs concurrently.
The support beam 14 can extend along the contact surface across a length of the associated IC chip die, such as between a first edge of the IC chip die and a second edge of the IC chip die opposite the first edge. The support beam 14 can thus provide supporting of the associated IC chip die during testing of the resultant IC subsequent to the trimming of the chip-pin connections 12 from the conductive leadframe 10 to provide the chip-pins. As an example, the support beam 14 can be coupled to a single one of the chip-pin connections 12 that remains untrimmed during the testing of the resultant IC. Therefore, the associated IC chip die can be supported at three support locations during the testing of the IC, at least two of which are provide adjacent ends of the support beam 14.
One of the support locations can be associated with the untrimmed one of the chip-pin connections 12, which can correspond to a ground connection, while the other two support locations can be associated with opposite ends of the support beam 14 proximal to the first and second edges of the associated IC chip die. Accordingly, based on the associated IC chip die having multiple supporting points during testing of the resultant IC, such as with only a single chip-pin connection 12 coupled to ground, parallel testing of multiple ICs can occur, such that pivoting of the associated IC chip die can be mitigated. Such pivoting can result in loss of electrical connectivity of the tester and the associated chip-pins, which can thus result in a failed test of the resultant IC. Accordingly, pivoting of the resulting IC chip die can be mitigated during testing based on having multiple support locations for only a single chip-pin connection 12 being coupled to ground, as opposed to typical IC parallel testing in which the IC chip die may be supported at only a single supporting point (e.g., the ground connection).
As described previously, the chip-pin connections 52, 54, 56, 58, 60, and 62 can be respectively electrically coupled to an IC chip die that is associated with the resulting IC chip package. For example, the chip-pin connections 52, 54, 56, 58, 60, and 62 can be electrically coupled to bond pads associated with the IC chip die via conductive lead wires. Additionally, the chip-pin connections 52, 54, 56, 58, 60, and 62 can subsequently be mechanically trimmed from the conductive leadframe 50 to form the chip-pins of the resultant IC chip package.
The support beam 64 is demonstrated as extending from a first end 66 of the outer frame 51 of the conductive leadframe 50 to a second end 68 of the outer frame 51 conductive leadframe 50. Therefore, the support beam 64 can extend along the contact surface across a length of the associated IC chip die, such as between a first edge of the IC chip die and a second edge of the IC chip die opposite the first edge. For example, the support beam 14 is dimensioned and configured to extend across the leadframe 50 a length that is at least commensurate (e.g., slightly longer than) the IC chip die that is to disposed thereon to form a corresponding IC. The conductive leadframe 50 can be fabricated such that the chip-pin connection 54 is slightly offset from a center-line across the conductive leadframe 50 to accommodate the support beam 64. Additionally, in the example of
The diagram 100 includes an outline of an IC chip die 102, demonstrated as a dashed line, that can be enclosed in an IC chip package. The IC chip die 102 includes bond pads 105 that are each conductively coupled to a respective one of the chip-pin connections 52, 54, 56, 58, 60, and 62 via a respective conductive lead wire 106. At this stage, the IC chip die 102 can be covered with a molding material within the associated IC chip package, subsequent to the coupling of the chip-pin connections 52, 54, 56, 58, 60, and 62 via the respective conductive lead wires 106, and thus prior to the testing of the associated IC. Alternatively, the IC chip die 102 can be covered with the molding material within the associated IC chip package subsequent to the testing of the associated IC. Additionally, in the example of
In the example of
As described previously, the support beam 64 is demonstrated as extending from a first end 66 of the outer frame 51 of the conductive leadframe 50 to a second end 68 of the outer frame 51 conductive leadframe 50. Therefore, the support beam 64 extends along the contact surface across a length of the associated IC chip die 102 (e.g. along a substrate), such as between a third and fourth edges 112 and 114 of the IC chip die 102. The third and fourth edges 112 and 114 thus interconnect the first and second edge 108 and 110. Therefore, in the example of
Based on the IC chip die 102 having the three support locations 116, 118, and 120 during testing of the associated IC, the placement of the IC chip die 102 can be afforded increased stability with respect to the conductive leadframe 50. Therefore, test equipment that is provided to concurrently contact the chip-pins associated with the chip-pin connections 52, 54, 56, 58, 60, and 62 can maintain contact with all of the chip-pins based on the stability provided via the three support locations 116, 118, and 120. By contrast, other typical leadframe designs may include only a single support location (e.g., a single chip-pin connection), and thus can experience pivoting about that single support location as a result of a less stable connection of the IC chip die to the conductive leadframe. Such pivoting can result in a loss of connectivity of the testing leads to the chip-pins, and thus a failed test. Accordingly, the conductive leadframe 50 disclosed herein can provide a more stable testing environment in fabrication of IC chip packages.
Each of the conductive leadframes in the conductive leadframe array 200 can be arranged substantially the same as the conductive leadframe 50 in the example of
Each of the conductive leadframes in the rows 202 and the columns 204 is demonstrated as receiving a respective IC chip package 206. The support beam thus provides support at two or more (e.g., three) locations along the periphery of the IC chip package 206. In the example of
As an example, during testing of the associated ICs associated with each of the conductive leadframes, a parallel test fixture (e.g., a strip handler) can be applied to a given row 202, column 204, or multiple leadframe portion the conductive leadframe array 200 to provide parallel testing of the associated ICs. Because each of the conductive leadframes in the conductive leadframe array 200 can include a plurality of supporting locations (e.g., three supporting locations, as described previously in the example of
What have been described above are examples. It is, of course, not possible to describe every conceivable combination of components or methodologies, but one of ordinary skill in the art will recognize that many further combinations and permutations are possible. Accordingly, the disclosure is intended to embrace all such alterations, modifications, and variations that fall within the scope of this application, including the appended claims. As used herein, the term “includes” means includes but not limited to, the term “including” means including but not limited to. The term “based on” means based at least in part on. Additionally, where the disclosure or claims recite “a,” “an,” “a first,” or “another” element, or the equivalent thereof, it should be interpreted to include one or more than one such element, neither requiring nor excluding two or more such elements.
This application claims the benefit of U.S. Provisional Application No. 62/193,978, filed Jul. 17, 2015, and entitled CHIP ON LEAD PACKAGE LEADFRAME WHICH FACILITATES PARALLEL TESTING ON STRIP HANDLERS, which is incorporated herein in its entirety.
Number | Date | Country | |
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62193978 | Jul 2015 | US |