Influence of Metallization and Size on the Conductive Properties of Metal-Coated Polymer Particles in Anisotropic Conductive Adhesive

2018 ◽  
Author(s):  
Molly Bazilchuk ◽  
Helge Kristiansen ◽  
Jianying He
Keyword(s):  
Conductive Adhesive ◽  
Polymer Particles ◽  
Anisotropic Conductive Adhesive ◽  
Conductive Properties

Electrical and mechanical characterization of an anisotropic conductive adhesive with a low melting point solder

2008 ◽  
Vol 85 (11) ◽  
pp. 2202-2206 ◽  
Author(s):  
Yong-Sung Eom ◽  
Keonsoo Jang ◽  
Jong-Tae Moon ◽  
Jae-Do Nam ◽  
Jong-Min Kim
Keyword(s):  
Melting Point ◽  
Mechanical Characterization ◽  
Conductive Adhesive ◽  
Anisotropic Conductive Adhesive

Issues in Assembly Process of Fine Pitch Chip-on-Flex Packages for LCD Applications

2004 ◽  
Author(s):  
Changsoo Jang ◽  
Seongyoung Han ◽  
Jay Ryu ◽  
Hangyu Kim
Keyword(s):  
Bonding Process ◽  
Conductive Adhesive ◽  
Assembly Process ◽  
Anisotropic Conductive Adhesive ◽  
Advantages And Disadvantages ◽  
Fine Pitch ◽  
Laser Bonding ◽  
Material Process ◽  
Process Combination ◽  
Underfill Material

Some of the current assembly issues of fine pitch chip-on-flex (COF) packages for LCD applications are reviewed. Traditional underfill material, anisotropic conductive adhesive (ACA) and non-conductive adhesive (NCA) are considered in conjunction with two applicable bonding methods including thermal and laser bonding. Advantages and disadvantages of each material/process combination are identified. Their applicability is further investigated to identify a process most suitable to the fine pitch packages (less than 40 μm). Numerical results and subsequent testing results indicate that NCA/laser bonding process produces most reliable joint for the fine pitch packages.

A Novel Anisotropic Conductive Adhesive for Lead-Free Surface Mount Electronics Packaging

2005 ◽  
Author(s):  
S. Manian Ramkumar ◽  
Krishnaswami Srihari
Keyword(s):  
Surface Area ◽  
Electronics Packaging ◽  
Conductive Adhesive ◽  
Lead Free ◽  
The Novel ◽  
Small Surface ◽  
Surface Mount ◽  
Anisotropic Conductive Adhesive ◽  
Fine Pitch ◽  
Very High

The electronics industry, in recent years, has been focusing primarily on product miniaturization and lead-free assembly. The need for product miniaturization is due to the continuous demand for portable electronic products that are multifunctional, yet smaller, faster, cheaper, and lighter. This is forcing the industry to design and assemble products with miniature passive and active devices. These devices typically have fine pitch footprints that provide a very small surface area for attachment. The solder attach technique relies primarily on the formation of intermetallics between the mating metallic surfaces. With a reduction in the surface area of the pads, the ratio of intermetallic to solder is very high once the solder joint is formed. This could result in unreliable solder joints, due to the brittle nature of intermetallics. In addition, the need to eliminate lead-based materials as a means of interconnection has renewed the industry’s interest in exploring other means of assembling surface mount devices reliably. This paper discusses the performance characteristics and preliminary research findings pertaining to a novel Anisotropic Conductive Adhesive (ACA) for electronics packaging applications, utilizing the Z Bond™ technology from Nexaura Systems, LLC. Typically, ACAs require the application of pressure during the curing process, to establish the electrical connection. The novel ACA uses a magnetic field to align the particles in the Z-axis direction and eliminates the need for pressure during curing. The formation of conductive columns within the polymer matrix provides a very high insulation resistance between adjacent conductors. The novel ACA also enables mass curing of the adhesive, eliminating the need for sequential assembly. The novel ACA’s I-V characteristics and performance under thermal and temperature-humidity aging are discussed in detail.

Performance of Anisotropically Conductive Adhesive Attachments on Adhesiveless Polyimide Substrate during High-Temperature Storage Tests

MRS Advances ◽  
2016 ◽  
Vol 1 (51) ◽  
pp. 3459-3464
Author(s):  
Sanna Lahokallio ◽  
Laura Frisk
Keyword(s):  
High Temperature ◽  
Conductive Adhesive ◽  
Anisotropic Conductive Adhesive ◽  
Polyimide Substrate ◽  
High Temperature Storage ◽  
Early Failures ◽  
Electrical Reliability ◽  
Electronics Packages ◽  
Very High ◽  
Temperature Storage

ABSTRACTThe high-temperature performance of electronics packages was studied at 180°C, 200°C and 240°C for 3,000h. The structure tested consisted of a fairly large silicon chip attached with anisotropic conductive adhesive (ACA) onto an adhesiveless PI substrate. These structures showed good electrical reliability at 180°C. Several early failures were seen at the other temperatures. However, only 23% of the test samples failed at 200°C, while considerably more failures were seen at 240°C. The results showed that good high-temperature reliability can be achieved with polymer interconnections. However, the exposure time should be limited, especially at very high temperatures, to avoid failures caused by the materials becoming brittle.

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