EP2569646A2 - Resilient probes for electrical testing - Google Patents
Resilient probes for electrical testingInfo
- Publication number
- EP2569646A2 EP2569646A2 EP06739525A EP06739525A EP2569646A2 EP 2569646 A2 EP2569646 A2 EP 2569646A2 EP 06739525 A EP06739525 A EP 06739525A EP 06739525 A EP06739525 A EP 06739525A EP 2569646 A2 EP2569646 A2 EP 2569646A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- probe
- holder
- sheet
- probes
- contact pads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/073—Multiple probes
- G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
- G01R1/07364—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with provisions for altering position, number or connection of probe tips; Adapting to differences in pitch
- G01R1/07378—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with provisions for altering position, number or connection of probe tips; Adapting to differences in pitch using an intermediate adapter, e.g. space transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/06711—Probe needles; Cantilever beams; "Bump" contacts; Replaceable probe pins
- G01R1/06733—Geometry aspects
- G01R1/06738—Geometry aspects related to tip portion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/06711—Probe needles; Cantilever beams; "Bump" contacts; Replaceable probe pins
- G01R1/06733—Geometry aspects
- G01R1/06744—Microprobes, i.e. having dimensions as IC details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/073—Multiple probes
- G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
- G01R1/07314—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card the body of the probe being perpendicular to test object, e.g. bed of nails or probe with bump contacts on a rigid support
- G01R1/07321—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card the body of the probe being perpendicular to test object, e.g. bed of nails or probe with bump contacts on a rigid support the probes being of different lengths
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips
Definitions
- the invention relates to apparatus and methods useful for testing semiconductor devices, especially semiconductor devices having fine pitch or irregular distribution of contact pads.
- the final test is a functional A. C. test to check the performance of the fully assembled and encapsulated device before its delivery to the customer. Among the parameters tested are speeds, propagation delay, and signal rise and fall. The final test needs to ascertain that the device meets the customer's specification and is, consequently, often coupled with an accelerated life test to prove the device's reliability under severe, but well defined environmental conditions.
- the semiconductor chips Before the assembly and encapsulation steps, the semiconductor chips, still in wafer form, are subjected to a D. C. parametric test, which principally measures leakage currents and compares input and output voltages. While these tests do not require special precautions for cooling the devices, since they are not operated "at speed,” they do require electrical contacts to the input/output terminals of the devices. The electrical contacts must be established reliably and should be non-permanent, low-resistance, and non-rectifying. It is common practice to use metallic probes as the means to establish the necessary electrical contact.
- the input/output terminals of electrical devices are often referred to as "bond pads,” since they serve, in the assembly process step, as contact areas for attaching the wire bonds for the connection to leadframes or substrates.
- the most common metal used for the bond pads is aluminum, which forms, due its exposure to ambient conditions, a thin, continuous, but self-limiting layer of aluminum oxide.
- the metallic probes must be able to penetrate the oxide layer in order to reach the underlying pure metal for reliable electrical test measurements.
- the act of penetrating through the metal oxide and undertaking the electrical testing is performed by a plurality of needles, preferably made of tungsten.
- These needles are formed as long cantilevers, substantially in horizontal layout, which are finally bent into a more vertical portion ending in a finely sharpened tip.
- the back end of the needles, opposite to the sharpened tip is attached to a probe card, and the tips are carefully aligned to the location of the bond pads-to-be-tested. Since there are commonly several hundred of these needles per probe card, and the needle pitch at the tips is of the order of 40 to 70 ⁇ m, the assembly of the probe cards is exceedingly tedious. The assembly has to be executed manually due to the variability of the bond pad locations from device type to device type. Consequently, probe cards are very expensive, and their handling is very sensitive.
- Applicant recognizes a need for a low-cost, mechanically robust, and operationally reliable structure of probe cards for electrical testing. It is further a technical advantage when the methodology provides custom-designs of the probe cards, especially when they should be operated for test pads laid out in x- and y-directions.
- the concept should also be flexible enough to be applied to different semiconductor product families and compatible with the industry trend towards devices with reflow bumps (solder balls) rather than wire bonds.
- the new probe card structure should not only meet high reliability and low maintenance, but should also achieve improvements towards the goals of enhanced fabrication yields and device testing time reduction.
- One embodiment of the invention is an apparatus for electrical testing.
- the apparatus has probes constructed of metal elements of about equal size bonded together in substantially linear sequence. Further it has an insulating holder having first and second surfaces and a plurality of metal-filled vias traversing the holder from the first to the second surface; the vias form contact pads on the first and second surfaces.
- the contact pads of the first holder surface have a probe attached so that the probe is positioned about normal to the surface.
- a sheet of resilient insulating material which has first and second surfaces and a thickness traversed by a plurality of conducting traces, has its first sheet surface attached to the second holder surface so that at least one of the traces contacts one of the contact pads, respectively, to provide an electrical path to the second sheet surface.
- a printed circuit board suitable for insertion into an electrical test apparatus, is attached to the second sheet surface so that a continuous electrical path is established from the apparatus to each of the probes.
- the metal elements, which form each probe, are preferably created as free air balls in the wire bonding technique; 2 to 6 elements are placed on top of each other to create the probe; the metal should be non-oxidizing and contains preferably gold.
- the tips of the probes may be coplanar or they may be out of coplanarity, depending on the contour of the chip design; preferably, the probe tips are pointed, for example by a coining technique.
- the probes can be placed on customized locations of the holder, with the preferred pitch center-to-center between about 40 and 80 ⁇ m, even smaller when desired.
- the probes can utilize the complete x-y plane.
- the resilient insulating material examples include z-axis conducting elastic polymers, including epoxies and polyimides, and a plurality of elastic springs, for instance micro-pogo- springs embedded in an insulator.
- the thickness of the resilient material is selected so that it provides a pre-determined amount of elastic compression and expansion. In the case of aluminum as bond pad metallization, an elastic compression and expansion of at least 10 ⁇ m is preferred in order to break reliably through the aluminum oxide.
- Another embodiment of the invention is an electrically tested semiconductor device, which has a plurality of test members such as test pads covered with metal or a solder ball.
- an apparatus is provided including a plurality of probes and a sheet of resilient material as described above.
- the apparatus is aligned with the semiconductor device so that the probes are aligned with the test members, respectively.
- the probes are then brought into contact with the test members so that the sheet of resilient material is compressed and the probes break through any metal oxide layer on the test member; the electrical testing can get started.
- Embodiments of the invention are related to multiprobe testing of semiconductor wafers of devices based on silicon, silicon germanium, gallium arsenide, and any other semiconductor compound used for device production.
- test pads of these devices may have any distribution and do not have to be arrayed along the chip periphery or in any other particular order.
- the invention lends itself to probe cards for devices with a non-coplanar surface, since the invention allows the probes to be manufactured at variable lengths.
- test card manufacture is inexpensive compared to cards made by the conventional technology; it uses automated processes such as ball formation in wire bonders, and automated assembly.
- Another technical advantage of the invention is the fact that the testing procedure leaves only minimal marks in the metallization of the test pads, which greatly simplifies subsequent processing steps of the semiconductor devices.
- FIG. 1 illustrates schematically a probe card for electrical testing according to the invention, the probe card inserted into a test equipment.
- the portion marked "A” is magnified in FIG. 2.
- FIG. 2 shows a magnified schematic cross section through the probe card portion marked "A" in FIG. 1, illustrating certain embodiments of the invention.
- FIG. 3 is a magnified view of an individual probe as employed in the probe card illustrated in FIG. 2.
- FIG. 4 is a magnified view of another individual probe according to the invention.
- FIG. 5 is a schematic cross section through a probe formed according to the invention.
- FIG. 6 is a schematic cross section through another probe formed according to the invention.
- FIG. 7 shows a magnified schematic cross section through the probe card portion marked "A" in FIG. 1, illustrating other embodiments of the invention.
- FIG. 8 illustrates a magnified electrically conductive resilient element of the insulating sheet employed by the probe card according to the invention.
- FIG. 1 shows schematically a cross section through an apparatus for testing according to the invention.
- the apparatus is generally designated 100, and the test equipment 110.
- the apparatus is electrically and mechanically connected to the test equipment by a plurality of pins (not shown on FIG. 1) which are pushed into the corresponding sockets of the equipment.
- the apparatus 100 consists of several portions: At the surface facing the device-to- be-probed are the actual probes 101, which establish the electrical contacts to the device test pads. The composition, orientation and distribution of probes 101 are discussed in more detail in FIGS. 2 thru 8. Probes 101 are attached the insulating holder 102, which is traversed by metal-filled vias and described in more detail in FIGS. 2 and 7. Holder 102 in turn is attached to a sheet 103 of resilient insulating material, which is traversed by conductive traces and discussed in more detail in FIGS. 2 and 7. Resilient sheet 103 has elastic properties .
- Resilient sheet 103 is attached to the printed circuit board 104, which spreads the conductive traces of the probe card to a wider area.
- the printed circuit board 104 is contacted by a tower-like portion 105, which contains a plurality of parallel pogo sticks 105a and is, therefore, sometimes referred to as the pogo tower.
- One end of the pogo sticks protrudes from apparatus 100 as pins in order to serve as connectors to the test equipment 110.
- FIG. 2 is a schematic and not-to-scale enlargement of portion "A" of the apparatus cross section in FIG. 1.
- the test probes 201 comprise a plurality of metal elements 201a.
- metal elements 102a have about equal size and are bonded together in a substantially linear sequence center-to-center, wherein the linear axis 201b is approximately normal to the first surface 202a of insulating holder 202.
- metal elements 201a are fabricated as air balls by typical automated wire bonders, they have substantially rotation- symmetrical shape or even approximately spherical shape.
- FIG. 3 shows a first (301) and a second (302) free air ball created by an automated wire bonder and somewhat flattened by pressing them against a substrate 310.
- the diameter 303 is preferably in the range from about 15 to 40 ⁇ m.
- the free air balls are made from bonding wires, which comprise an alloy rich in gold, yet hardened by mixtures with a small percentage of copper and other metals.
- the wire (diameter between preferably between about 15 and 30 ⁇ m) is strung through a capillary.
- a free air ball is created using either a flame or a spark technique.
- the ball has a typical diameter from about 1.2 to 1.6 wire diameters.
- the capillary is moved towards the substrate 310 and the ball is pressed against the substrate.
- the compression (also called Z- or mash) force is typically between about 17 and 75 g.
- the temperature usually ranges from 150 to 270 0 C.
- the second ball 302 is pressed on top of the first ball 301 in a substantially linear sequence, preferably so that the center-to-center line is approximately normal to the equatorial plane of the balls. Slight deviations from the vertical arrangement can be tolerated.
- the flame-off tip 302a of the second ball 302 is clearly visible. As FIG. 2 indicates, the flame-off tip (designated 201c) is facing outwardly from the attachment surface 202a of holder 202.
- FIG. 4 depicts a segmented probe comprising four metal elements 401 to 404, produced and stacked in about linear sequence by automated wire bonding techniques. The flame-off tip 404c points outwardly from attachment surface 410.
- the axis 420 of the segmented probe is approximately normal to attachment surface 410. It is a technical advantage for some embodiments of the invention that pre-determined probes can be manufactured with more segments than others in order for the probes to exactly follow unequal surface contours of specific devices.
- the segmented probes comprise 2 to 6 metal elements bonded together, thus forming a probe length between about 40 and 120 ⁇ m.
- the insulating holder is designated 202, its first surface 202a and its second surface 202b.
- a preferred material for holder 202 is ceramic, since it is well suited to be formed as multilayer component.
- Holder 202 is traversed from surface 202a to surface 202b by a plurality of metal-filled vias 210. Each via 210 terminates in contact pads on each surface; in FIG. 2, the contact pads on first surface 202a are designated 210a, the contact pads on second surface 202b are designated 210b.
- the contact pads 202a on first holder surface 202a have a probe 201 attached; preferably, the attachment is so that the probe axis 201b is substantially normal to surface 202a.
- the pitch center-to-center of contact pads 210a and thus probes 201 is preferably between about 40 and 80 ⁇ m.
- the preferred metal for vias 210 is copper or a copper alloy, and for the surfaces 202a and 202b of the contact pads a non-oxidizing metal, for instance a (thin) gold or palladium layer, indicated 210c in one example of FIG. 2.
- a non-oxidizing metal for instance a (thin) gold or palladium layer, indicated 210c in one example of FIG. 2.
- the sheet 203 made of resilient insulating material has first surface 203 a and second surface 203b.
- First sheet surface 203a is adhesively attached to second holder surface 202b.
- Sheet 203 has a thickness, which is preferably in the range from about 50 to 200 ⁇ m.
- the thickness of the resilient material is selected so that sheet 203 provides a pre-determined amount of elastic compression and expansion. In the case of aluminum as device bond pad metallization, an elastic compression and expansion of at least 10 ⁇ m is preferred in order to break reliably through the aluminum oxide.
- the thickness is traversed by a plurality of electrically conducting traces, schematically indicated by lines 220, which may be irregular in some embodiments.
- a preferred example of resilient insulating material with conducting traces is a z-axis conducting elastic polymer including z-axis conducting epoxy or polyimide; in this example, the conducting traces may have a diameter on the order of 1 ⁇ m.
- Another example is an elastomeric material with small wires of a pre-selected density; in this case, the wires may have a diameter on the order of 25 ⁇ .
- a plurality of conducting traces 220 are electrically connected to each contact pad 210b and thus provide an electrical path from probe 201 to sheet surface 203b.
- sheet surface 203b is (adhesively) attached to printed circuit board 204, bringing conductive traces 220 in electrical contact with the contact pads 230 of printed circuit board 204.
- the connection between the holder 202 and the printed circuit board 204 may be further strengthened by mechanical locks.
- the contact pads 230 of the printed circuit board connect by means of printed traces to the pogo tower with its pogo connections to the pins into the electronic test equipment. A clearly defined electrical path is thus established between each probe and the test equipment.
- FIG. 8 illustrates a metallic pogo spring suitable for providing the resilient characteristic
- FIG. 7 depicts a plurality of pogo springs 701, 702 in an insulating pogo housing 703, which is selected to form the resilient sheet.
- Pogo spring interposers are commercially available, for instance from the company Rika Denshi, Japan.
- the initial length of the pogo spring is indicated by 801; as an example, it may be about 5.2 mm.
- the operating length 802 may be about 4.8 mm.
- the invention provides for the locations of the probes 201 to be selected in customized fashion in both x- and y- directions, opening the opportunity to test pre-selected test pads across the complete chip surface in x- and y- directions.
- the invention further provides for probes of various lengths and thus for non-coplanar locations of the probe tips 20Ic 3 opening the opportunity to test coplanar as well as non-planar chip surfaces.
- FIGS. 5 and 6 schematically and not to-scale
- the final element on one end of the probe has been coined or stamped to obtain a pointed shape.
- the coining or stamping process step may also provide a hardening of the probe tip.
- the diameter 501 of the probe tip has obtained a considerably smaller diameter than the original probe diameter 502.
- the whole probe has been stamped into a shape so that it gradually narrows from its end 603 attached to the contact pad 610 to its remote end 605; the remote end has an approximately point-like configuration.
- the probe is attached to the first holder surface 510 and 610, respectively, so that the pointed element 501 and 601, respectively, point outward from the holder surface.
- test members are flat metal test pads in one plane; metal test pads in various planes; metal reflow elements (such as solder balls) in one plane; and metal reflow elements in various planes.
- an apparatus is provided, which has a structure as described above in detail.
- the apparatus comprises a probe with a plurality of metal elements of about equal size bonded together in substantially linear sequence.
- the apparatus further has an insulating holder with first and second surfaces and a plurality of metal-filled vias traversing the holder from the first to the second surface.
- the vias form contact pads on the first and second surfaces; the location of the contact pads on the first surface match the locations of the test pads of the semiconductor device.
- the contact pads of the first holder surface have a probe attached so that the probe is positioned about normal to the surface.
- the apparatus further has a sheet of resilient insulating material with first and second surfaces and a thickness, traversed by a plurality of conducting traces.
- the first sheet surface is attached to the second holder surface so that at least one of the traces contacts one of the contact pads, respectively, to provide an electrical path to the second sheet surface.
- the apparatus has a printed circuit board suitable for insertion into an electrical test apparatus; the board is attached to the second sheet surface so that a continuous electrical path is established from the apparatus to each of the probes.
- the apparatus is aligned with the semiconductor device so that the probes are aligned with the test members, respectively.
- the probes of the apparatus are then brought in contact with the test members so that the sheet of resilient material is compressed, whereby the probes break through any metal oxide layer on the test members and the electrical testing can get started.
- the elastic characteristics of the resilient sheet provide enough force to the probes, which are about vertically attached to the apparatus and about vertically impinging on the device test members, so that the break though any metal oxide on the test members can be accomplished without the help of cantilevers. In this manner, the testing procedure leaves only minimal marks without smearing in the metallization of the test pads, which greatly simplifies subsequent processing steps of the semiconductor device.
- the embodiments are effective in semiconductor devices and any other device with test pads, for which electrical measurements need to be taken, for instance substrates and printed circuit boards, assembled multi-device products, and piece part units.
- the semiconductor devices may include products based on silicon, silicon germanium, gallium arsenide and other semiconductor materials employed in manufacturing.
- the concept of the invention is effective for many semiconductor device technology nodes and not restricted to a particular one. It is therefore intended that the claimed invention encompass any such modifications or embodiments.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US66567605P | 2005-03-28 | 2005-03-28 | |
US11/116,884 US8438645B2 (en) | 2005-04-27 | 2005-04-27 | Secure clock with grace periods |
PCT/US2006/010779 WO2006104886A2 (en) | 2005-03-28 | 2006-03-23 | Resilient probes for electrical testing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2569646A2 true EP2569646A2 (en) | 2013-03-20 |
EP2569646A4 EP2569646A4 (en) | 2014-01-22 |
Family
ID=37053934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06739525.1A Ceased EP2569646A4 (en) | 2005-03-28 | 2006-03-23 | Resilient probes for electrical testing |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2569646A4 (en) |
WO (1) | WO2006104886A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI827809B (en) * | 2019-04-04 | 2024-01-01 | 丹麥商卡普雷斯股份有限公司 | Method for measuring an electric property of a test sample, and multilayer test sample |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5703494A (en) * | 1994-11-09 | 1997-12-30 | Tokyo Electron Limited | Probing test apparatus |
US5828226A (en) * | 1996-11-06 | 1998-10-27 | Cerprobe Corporation | Probe card assembly for high density integrated circuits |
US6204681B1 (en) * | 1998-01-14 | 2001-03-20 | Hitachi Electronics Engineering Co., Ltd. | IC device contactor |
US6215321B1 (en) * | 1997-11-25 | 2001-04-10 | Matsushita Electric Industrial Co., Ltd. | Probe card for wafer-level measurement, multilayer ceramic wiring board, and fabricating methods therefor |
US20020043980A1 (en) * | 2000-08-24 | 2002-04-18 | Rincon Reynaldo M. | Multiple-chip probe and universal tester contact assemblage |
US6483328B1 (en) * | 1995-11-09 | 2002-11-19 | Formfactor, Inc. | Probe card for probing wafers with raised contact elements |
US20040124519A1 (en) * | 2002-10-10 | 2004-07-01 | Yu Zhou | Contact structure and production method thereof and probe contact assembly using same |
US6812718B1 (en) * | 1999-05-27 | 2004-11-02 | Nanonexus, Inc. | Massively parallel interface for electronic circuits |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5829128A (en) * | 1993-11-16 | 1998-11-03 | Formfactor, Inc. | Method of mounting resilient contact structures to semiconductor devices |
US5914613A (en) * | 1996-08-08 | 1999-06-22 | Cascade Microtech, Inc. | Membrane probing system with local contact scrub |
-
2006
- 2006-03-23 EP EP06739525.1A patent/EP2569646A4/en not_active Ceased
- 2006-03-23 WO PCT/US2006/010779 patent/WO2006104886A2/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5703494A (en) * | 1994-11-09 | 1997-12-30 | Tokyo Electron Limited | Probing test apparatus |
US6483328B1 (en) * | 1995-11-09 | 2002-11-19 | Formfactor, Inc. | Probe card for probing wafers with raised contact elements |
US5828226A (en) * | 1996-11-06 | 1998-10-27 | Cerprobe Corporation | Probe card assembly for high density integrated circuits |
US6215321B1 (en) * | 1997-11-25 | 2001-04-10 | Matsushita Electric Industrial Co., Ltd. | Probe card for wafer-level measurement, multilayer ceramic wiring board, and fabricating methods therefor |
US6204681B1 (en) * | 1998-01-14 | 2001-03-20 | Hitachi Electronics Engineering Co., Ltd. | IC device contactor |
US6812718B1 (en) * | 1999-05-27 | 2004-11-02 | Nanonexus, Inc. | Massively parallel interface for electronic circuits |
US20020043980A1 (en) * | 2000-08-24 | 2002-04-18 | Rincon Reynaldo M. | Multiple-chip probe and universal tester contact assemblage |
US20040124519A1 (en) * | 2002-10-10 | 2004-07-01 | Yu Zhou | Contact structure and production method thereof and probe contact assembly using same |
Non-Patent Citations (1)
Title |
---|
See also references of WO2006104886A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006104886A2 (en) | 2006-10-05 |
WO2006104886A3 (en) | 2007-03-01 |
EP2569646A4 (en) | 2014-01-22 |
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