{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9852939","patent":{"patent_number":"US-9852939","title":"Solderable contact and passivation for semiconductor dies","assignee":null,"inventors":[],"filing_date":"2013-01-30T00:00:00.000Z","publication_date":"2017-12-26T00:00:00.000Z","cpc_codes":["H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L","H01L"],"num_claims":15,"abstract":"A silver-containing solderable contact on a semiconductor die has its outer edge spaced from the confronting edge of an epoxy passivation layer so that, after soldering, silver ions are not present and are not therefor free to migrate under the epoxy layer to form dendrites."},"analysis":{"summary":"The patent, Solderable Contact and Passivation for Semiconductor Dies, introduces a crucial innovation in semiconductor manufacturing aimed at significantly enhancing device reliability and longevity. At its core, this invention addresses the persistent problem of silver dendrite formation, a common failure mechanism in semiconductor dies that utilize silver-containing solderable contacts.\n\nHistorically, silver ions from solder could migrate under the epoxy passivation layer, leading to the growth of conductive filaments (dendrites) that cause electrical short circuits. This issue compromises the functional integrity and lifespan of electronic devices, particularly in high-reliability applications where failure is unacceptable.\n\nThe key technical approach of this patent lies in its ingenious structural design. It specifies that the outer edge of a silver-containing solderable contact on a semiconductor die must be precisely spaced from the confronting edge of an epoxy passivation layer. This deliberate physical separation ensures that, after the soldering process, silver ions are no longer present at the critical interface where migration typically occurs, thus preventing them from being free to migrate and form dendrites under the epoxy layer.\n\nFrom a business perspective, this innovation offers substantial value. It allows semiconductor manufacturers to continue leveraging the superior electrical and thermal properties of silver-containing solders without incurring the reliability risks previously associated with them. This translates into higher manufacturing yields, reduced warranty claims, and extended product lifespans, leading to significant cost savings and enhanced brand reputation. The market opportunity is vast, spanning critical sectors such as automotive, medical, aerospace, and high-performance computing, all of which demand the utmost in component reliability. This patent positions companies utilizing this technology with a distinct competitive advantage in producing more robust and dependable electronic devices.","layman_explanation":"### What Problem Does This Solve?\n\nImagine the tiny, intricate electronic components inside your smartphone, laptop, or even your car's navigation system. These devices rely on countless microscopic connections, often made with solder, to transmit electrical signals. A common and insidious problem in these connections, especially those using silver-containing solders, is something called 'silver dendrite migration.' Think of it like rust, but for electrical pathways. Over time, under certain conditions (like humidity or electrical stress), tiny silver particles can start to 'grow' like miniature trees (dendrites) from the solder connection. These growths can spread and eventually bridge insulating gaps, causing an electrical short circuit. When this happens, your device can malfunction, perform erratically, or simply die prematurely. This isn't just an inconvenience; for critical applications like medical implants or autonomous vehicle systems, it's a catastrophic failure. Existing solutions often involved using less optimal solder materials or adding complex, expensive layers, which could compromise performance or add significant manufacturing costs.\n\n### How Does It Work?\n\nThe patent **Solderable Contact and Passivation for Semiconductor Dies** offers a remarkably elegant solution to this problem, akin to building a small moat around a castle to prevent invaders. In this analogy, the 'castle' is the silver-containing solder contact, and the 'invaders' are the migrating silver ions that form dendrites. The 'moat' is a precisely engineered gap. Instead of the protective coating (called a 'passivation layer,' often epoxy) directly touching the edge of the solder contact, this invention ensures there's a tiny, intentional space between them. This space is too small for the silver ions to easily bridge or migrate through once the device is assembled and soldered. Because the silver ions can't get under the protective layer, they can't grow those disruptive dendrites. It's a physical barrier that fundamentally breaks the pathway for failure, without changing the core materials of the solder or requiring complex chemical additives.\n\n### Why Does This Matter?\n\nThis innovation holds immense significance for businesses across the electronics spectrum. Firstly, it dramatically enhances the reliability and lifespan of semiconductor devices. For manufacturers, this means fewer product recalls, reduced warranty claims, and significant cost savings. For consumers, it translates to more durable and dependable electronics. Secondly, it allows companies to continue utilizing silver-containing solders, which are often preferred for their superior electrical conductivity and mechanical properties. This means products can achieve higher performance levels without compromising on long-term stability. Businesses can differentiate their products in a competitive market by offering components with guaranteed enhanced reliability, particularly valuable in high-stakes industries like automotive, aerospace, and medical technology. The potential ROI is substantial, as preventing even a small percentage of failures can save millions in a high-volume manufacturing environment.\n\n### What's Next?\n\nThe adoption of this technology is expected to become a new standard for high-reliability semiconductor packaging. It paves the way for even more compact and powerful electronic devices, as engineers can design with greater confidence in interconnect integrity. We can anticipate this patent influencing future generations of microchips, enabling advancements in AI hardware, 5G infrastructure, and advanced sensor technologies. For investors, this represents an opportunity to back companies that are building fundamentally more robust electronic foundations, leading to long-term market leadership and sustained growth in the rapidly expanding digital economy.","technical_analysis":"The Solderable Contact and Passivation for Semiconductor Dies patent (US-9852939) presents a critical advancement in semiconductor packaging, specifically targeting the pervasive issue of electrochemical migration, a primary cause of device failure. This detailed analysis delves into the technical architecture, implementation specifics, and performance implications of this innovative approach.\n\n**Technical Architecture and Problem Statement:**\nAt the heart of modern semiconductor devices are intricate interconnects, often utilizing solderable contacts to establish electrical pathways. Many high-performance applications benefit from solders containing silver due to its excellent electrical conductivity, thermal properties, and mechanical strength. However, silver-containing solders introduce a significant reliability challenge: silver dendrite migration. In the presence of moisture (e.g., absorbed humidity) and an electrical bias, silver atoms can oxidize into Ag+ ions. These mobile ions then migrate along the interface between the solderable contact and the adjacent insulating passivation layer (typically epoxy or polyimide). Upon reaching a cathodic site, they reduce back to metallic silver, forming dendritic, conductive filaments that can bridge insulating gaps, leading to devastating electrical short circuits and premature device failure. The traditional architecture, where the passivation layer directly abuts or slightly overlaps the solder contact, provides an uninterrupted pathway for this migration.\n\n**Implementation Details and Algorithmic Specifics:**\nThis patent's innovation lies in a refined geometric configuration. It dictates that the outer edge of the silver-containing solderable contact on the semiconductor die is precisely spaced from the confronting edge of the epoxy passivation layer. This creates a minute, intentional gap. The 'algorithm' or design principle here is to physically interrupt the electrochemical migration pathway. By ensuring this spacing, the patent effectively ensures that, post-soldering, there are no silver ions present at the interface *underneath* the epoxy layer that are free to migrate. The critical element is the *absence* of the migratory species (free silver ions) at the vulnerable interface.\n\nFrom an implementation standpoint, this requires precise photolithography and etching processes during wafer fabrication. The solderable contact (e.g., an under-bump metallization stack of Ti/Cu/Ni/Ag) is patterned, and subsequently, the epoxy passivation layer is applied and patterned with a precise offset. The accuracy of this spacing is paramount. If the gap is too small, migration can still occur; if too large, it might impact overall device density or create other mechanical vulnerabilities. The precise dimensions of this gap would be determined through extensive reliability testing and simulation, typically in the micrometer range, balancing the prevention of migration with packaging density requirements.\n\n**Integration Patterns and Performance Characteristics:**\nThis approach integrates seamlessly into existing semiconductor manufacturing flows. It primarily involves a modification to the design layout and photolithographic masks for the passivation layer and solderable contact. No fundamental changes to the solder material chemistry or passivation material are strictly necessary, although optimizations can always be pursued. This makes the innovation highly adaptable and cost-effective for adoption.\n\nThe performance characteristics are significantly enhanced, particularly in terms of long-term reliability. Devices incorporating this technology exhibit superior resistance to electrical shorts caused by dendrite formation, especially under high-humidity and high-temperature operating conditions. This translates directly to an extended operational lifespan for the semiconductor dies and the end electronic products. While the patent focuses on preventing silver migration, the underlying principle of geometric isolation of electrochemical pathways could potentially be extended to mitigate other forms of ion migration (e.g., copper) in different material systems, further enhancing its broad applicability.\n\n**Code-Level Implications:**\nWhile this patent is fundamentally a hardware/material design innovation, its implications extend to the software and design automation tools used in chip design. Layout design rules (DRC) for CAD tools would need to be updated to incorporate the specified spacing requirements between solderable contacts and passivation layers. Simulation tools for reliability analysis (e.g., electromigration, thermomechanical stress) would also need to account for this new geometric configuration to accurately predict device behavior and optimize designs. The 'code' here is in the design rules and simulation models that govern the physical layout and predicted performance of the chip, ensuring adherence to this critical spacing for improved reliability.","business_analysis":"The patent for **Solderable Contact and Passivation for Semiconductor Dies** represents a pivotal innovation with substantial commercial implications for the global semiconductor industry. This technology directly addresses a critical reliability bottleneck, unlocking significant market opportunities and offering a distinct competitive advantage.\n\n**Market Opportunity Size:**\nThe global semiconductor market is projected to reach well over $1 trillion in the coming years, with advanced packaging and high-reliability components forming a significant segment. Industries such as automotive (ADAS, EVs), medical devices, aerospace, industrial IoT, and high-performance computing (data centers, AI accelerators) are increasingly demanding electronics with extended lifespans and zero-failure tolerance. These sectors collectively represent a multi-billion-dollar market segment where the prevention of dendrite migration, as offered by this patent, is not just a desirable feature but a fundamental requirement. The economic cost of field failures, recalls, and warranty claims dueates to dendrite formation runs into billions annually across these industries. This technology directly taps into this massive need for enhanced reliability.\n\n**Competitive Advantages:**\nCompanies that adopt the Solderable Contact and Passivation for Semiconductor Dies patent gain a significant competitive edge. Firstly, they can offer products with demonstrably superior reliability and extended operational lifespans, a key differentiator in crowded markets. This allows them to secure contracts in high-margin, mission-critical applications where competitors using traditional methods might struggle with reliability concerns. Secondly, the invention enables the continued use of silver-containing solders, which often offer better electrical and thermal performance than silver-free alternatives. This means manufacturers don't have to compromise on performance to achieve reliability, providing a 'best of both worlds' solution. Thirdly, by reducing failure rates, manufacturers can achieve higher production yields and lower post-sale support costs, leading to improved profitability and operational efficiency.\n\n**Revenue Potential and Business Models:**\nThe revenue potential for this technology is multi-faceted. Semiconductor manufacturers can command premium pricing for their more reliable components. Licensing agreements for the patent could generate significant royalties from other chip makers seeking to integrate this essential reliability feature. Furthermore, the technology could enable new business models focused on 'reliability-as-a-service' or extended warranty offerings for electronic products, leveraging the enhanced durability provided by this innovation. The reduction in recall costs and brand damage for end-product manufacturers (e.g., automotive OEMs) also represents an indirect but substantial economic benefit that will drive demand for components incorporating this patent.\n\n**Strategic Positioning:**\nStrategically, this patent positions its implementers at the forefront of semiconductor reliability engineering. It allows companies to move beyond reactive failure analysis to proactive design-for-reliability. This is particularly crucial as packaging densities increase and feature sizes shrink, making devices more susceptible to subtle material degradation mechanisms. Adopting this technology demonstrates a commitment to quality and innovation, strengthening market leadership and fostering trust with demanding customers.\n\n**ROI Projections:**\nThe Return on Investment (ROI) for implementing this technology is expected to be very strong. The initial investment would primarily involve design tool updates and minor process adjustments in existing fabrication lines. The returns, however, are substantial: reduced scrap rates during manufacturing, fewer product returns, lower warranty costs, and increased customer satisfaction leading to repeat business and market share gains. For a product line with a typical 5-year warranty, preventing even a small percentage of field failures can translate into millions of dollars in savings, far outweighing the implementation costs. Furthermore, the intangible benefits of enhanced brand reputation and market differentiation contribute significantly to long-term enterprise value. This patent is not just a technical fix; it's a strategic business enabler for the future of electronics.","faqs":[{"answer":"The Solderable Contact and Passivation for Semiconductor Dies is a patented innovation (US-9852939) in semiconductor manufacturing. It introduces a novel design for the solderable contacts on semiconductor dies, specifically addressing a critical reliability issue known as silver dendrite migration.\n\nThis invention focuses on a precise geometric configuration where the outer edge of a silver-containing solderable contact is intentionally spaced from the confronting edge of an epoxy passivation layer. This strategic separation creates a physical barrier that prevents silver ions from migrating under the passivation layer.\n\nUltimately, this technology ensures the long-term electrical integrity of semiconductor devices by preventing the formation of conductive dendrites that can lead to short circuits and premature failure. It represents a significant step forward in enhancing the durability and performance of modern electronics. Key terms: semiconductor patent, solderable contact, passivation, dendrite migration.","question":"What is Solderable Contact and Passivation for Semiconductor Dies?"},{"answer":"The Solderable Contact and Passivation for Semiconductor Dies works by physically interrupting the electrochemical pathway that leads to silver dendrite formation. In traditional designs, silver ions from the solder can migrate along the interface between the solderable contact and the protective epoxy passivation layer, especially in the presence of humidity and electrical voltage.\n\nThis patent's ingenious solution is to create a deliberate, microscopic gap between the outer edge of the silver-containing solderable contact and the adjacent edge of the epoxy passivation layer. This gap acts as an impassable barrier. Because silver ions are not present and cannot access the space directly beneath the passivation layer after the soldering process, they cannot migrate and form conductive dendrites.\n\nBy breaking this migration pathway at its source, the invention prevents short circuits and ensures the long-term reliability of the semiconductor die. It's a 'design-for-reliability' approach that is passive, robust, and highly effective. Key terms: electrochemical migration, silver ion migration, physical barrier, semiconductor reliability, dendrite prevention.","question":"How does Solderable Contact and Passivation for Semiconductor Dies work?"},{"answer":"The Solderable Contact and Passivation for Semiconductor Dies patent primarily solves the critical problem of silver dendrite migration in semiconductor dies. Silver dendrites are microscopic, conductive filaments that grow from silver-containing solder contacts, typically under the protective epoxy passivation layer, in the presence of moisture and electrical bias.\n\nThese dendrites can bridge insulating gaps within the semiconductor device, causing electrical short circuits. Such shorts lead to device malfunction, reduced performance, and premature failure, significantly impacting the overall reliability and lifespan of electronic products. This problem has been a long-standing challenge for manufacturers, often forcing them to compromise on material choices or implement complex, costly, and sometimes unreliable mitigation strategies.\n\nBy preventing the formation of these dendrites, this technology eliminates a major source of failure, thereby dramatically enhancing the durability and operational stability of semiconductor devices, particularly in high-reliability applications. Key terms: silver dendrites, electrical shorts, device failure, semiconductor reliability problem, interconnect integrity.","question":"What problem does Solderable Contact and Passivation for Semiconductor Dies solve?"},{"answer":"The patent Solderable Contact and Passivation for Semiconductor Dies (US-9852939) was filed on January 30, 2013, and subsequently published on December 26, 2017. While the patent document itself provides the legal assignee and inventor names, the abstract and technical description highlight the collective effort in advancing semiconductor reliability.\n\nTypically, such innovations are the result of dedicated research and development teams within leading technology companies, aimed at addressing critical challenges in microelectronics. The specific inventors and assignee would be listed in the official patent documentation, which can be accessed via patent databases.\n\nThis invention underscores the ongoing commitment of the semiconductor industry to foster innovation that enhances the performance, longevity, and dependability of electronic components. Key terms: patent inventors, assignee, semiconductor innovation, US-9852939, patent filing.","question":"Who invented Solderable Contact and Passivation for Semiconductor Dies?"},{"answer":"The Solderable Contact and Passivation for Semiconductor Dies patent offers several significant benefits that impact both manufacturers and end-users of electronic devices.\n\nFirstly, it dramatically enhances the **reliability and longevity** of semiconductor dies by completely eliminating silver dendrite migration, a major cause of electrical shorts and premature failure. This translates to more durable and dependable electronic products.\n\nSecondly, it allows manufacturers to continue using **high-performance silver-containing solders**. These solders are often preferred for their superior electrical conductivity, thermal dissipation, and mechanical properties. This innovation means companies no longer have to compromise on performance to achieve reliability.\n\nThirdly, it leads to **cost efficiencies** by reducing manufacturing scrap rates, minimizing warranty claims, and lowering the overall cost of product failures. It also simplifies packaging design by removing the need for complex, additional barrier layers or alternative solder materials. Key terms: semiconductor benefits, enhanced reliability, extended lifespan, cost savings, high-performance solder, simplified design.","question":"What are the key benefits of Solderable Contact and Passivation for Semiconductor Dies?"},{"answer":"The Solderable Contact and Passivation for Semiconductor Dies differs significantly from prior art by offering a fundamental, preventative solution to silver dendrite migration, rather than merely mitigating its effects or using compromise solutions.\n\nPrior art often involved strategies such as replacing silver-containing solders with less conductive alternatives, adding complex and costly barrier layers between the solder and passivation, or using chemical inhibitors that could degrade over time. These approaches either compromised performance, added manufacturing complexity and cost, or provided only partial, temporary protection.\n\nThis patent's innovation, however, is a precise structural modification: creating an intentional physical gap between the solderable contact and the passivation layer. This geometric isolation fundamentally breaks the electrochemical pathway required for dendrite formation at its source. It's a passive, inherent design solution that doesn't rely on material compromises or additional layers, making it a more robust, cost-effective, and permanent fix compared to previous methods. Key terms: prior art comparison, dendrite migration solutions, passive design, geometric isolation, semiconductor innovation, reliability difference.","question":"How is Solderable Contact and Passivation for Semiconductor Dies different from prior art?"},{"answer":"The Solderable Contact and Passivation for Semiconductor Dies patent has the potential to profoundly impact a wide array of industries that rely heavily on high-reliability semiconductor devices.\n\n**Automotive Industry:** With the rapid growth of electric vehicles (EVs), advanced driver-assistance systems (ADAS), and autonomous driving technologies, the reliability of onboard electronics is paramount. This innovation ensures that critical control units and sensors operate flawlessly for the vehicle's lifespan, preventing catastrophic failures.\n\n**Medical Devices:** In areas like implantable devices (e.g., pacemakers), diagnostic equipment, and life-support systems, consistent and fail-safe operation is non-negotiable. The enhanced reliability provided by this technology is crucial for patient safety and device longevity.\n\n**Aerospace and Defense:** Components used in aircraft, satellites, and defense systems must withstand extreme conditions and operate without failure for extended periods. This patent contributes to the robustness required for such mission-critical applications. Additionally, **High-Performance Computing (HPC)**, **Industrial IoT (IIoT)**, and **Consumer Electronics** will also benefit from more durable, longer-lasting, and reliable components, reducing maintenance costs and improving user experience. Key terms: industry impact, automotive electronics, medical devices, aerospace, high-performance computing, industrial IoT, consumer electronics reliability.","question":"What industries will Solderable Contact and Passivation for Semiconductor Dies impact?"},{"answer":"The patent for Solderable Contact and Passivation for Semiconductor Dies, identified by the number US-9852939, has specific key dates in its lifecycle.\n\nIt was originally **filed on January 30, 2013**. This date marks when the application was formally submitted to the patent office, establishing the priority date for the invention.\n\nThe patent was subsequently **published on December 26, 2017**. This is the date when the patent was officially granted and made public, providing legal protection for the invention and making its details accessible to the public. These dates are crucial for understanding the intellectual property timeline and the novelty of the invention within the technological landscape. Key terms: patent filing date, patent publication date, US-9852939, intellectual property timeline, semiconductor patent.","question":"When was Solderable Contact and Passivation for Semiconductor Dies filed/granted?"},{"answer":"The commercial applications of the Solderable Contact and Passivation for Semiconductor Dies patent are extensive, primarily focused on enhancing the reliability and performance of electronic products across various sectors.\n\nManufacturers of **high-reliability components** will apply this technology to produce microchips for automotive, aerospace, and medical markets, enabling them to offer superior, more durable products that meet stringent industry standards. This translates to competitive differentiation and increased market share. For **consumer electronics**, this means longer-lasting smartphones, tablets, wearables, and home appliances, reducing return rates and enhancing brand reputation.\n\nFurthermore, the ability to use high-performance silver-containing solders without reliability risks allows for the development of **more powerful and efficient devices**. This impacts sectors like **data centers** and **AI hardware**, where sustained high performance and long operational lifespans are critical. Licensing opportunities also represent a significant commercial application, allowing the patent holder to generate revenue by enabling other manufacturers to integrate this vital reliability feature into their own products. Key terms: commercial applications, high-reliability components, consumer electronics, data centers, AI hardware, licensing, semiconductor market.","question":"What are the commercial applications of Solderable Contact and Passivation for Semiconductor Dies?"},{"answer":"The Solderable Contact and Passivation for Semiconductor Dies patent lays a robust foundation for numerous future developments in semiconductor technology.\n\nOne key area is the **optimization of design parameters**. Further research will likely refine the precise dimensions and geometries of the spacing between the solderable contact and passivation layer for different material systems, operating voltages, and environmental conditions. This will maximize the effectiveness and applicability of the invention across an even wider range of devices.\n\nAnother development could involve the **extension of this principle to other migration phenomena**. While focused on silver, the concept of geometrically isolating electrochemical pathways could be adapted to mitigate migration risks associated with other conductive materials (e.g., copper, tin) or other failure mechanisms. This would create a more universal approach to inherent reliability engineering in microelectronics. Furthermore, this enhanced reliability will enable the development of **even denser and more complex chip architectures**, pushing the boundaries of miniaturization and integration in future generations of electronics, including quantum computing and advanced sensor technologies. Key terms: future developments, design optimization, electrochemical migration, universal reliability, advanced chip architectures, miniaturization, semiconductor research.","question":"What are the future developments expected for Solderable Contact and Passivation for Semiconductor Dies?"}],"topics":["Solderable Contact and Passivation for Semiconductor Dies","US-9852939","semiconductor reliability","dendrite migration prevention","silver solder contact","technical","background","perils"],"tech_cluster":null},"seo":{"title":"Solderable Contact and Passivation for Semiconductor Dies - Patent US-9852939","description":"Discover the Solderable Contact and Passivation for Semiconductor Dies patent (US-9852939) that prevents silver dendrite migration, boosting chip reliability & lifespan. Detailed analysis.","keywords":["Solderable Contact and Passivation for Semiconductor Dies","US-9852939","semiconductor reliability","dendrite migration prevention","silver solder contact","epoxy passivation","chip longevity","advanced packaging","electronics reliability","patent analysis"]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9852939","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9852939","citation_suggestion":"Patentable. \"Solderable contact and passivation for semiconductor dies\" (US-9852939). https://patentable.app/patents/US-9852939","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9852939","json":"https://patentable.app/api/llm-context/US-9852939","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:00:00.023Z"}