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1994 Proceedings. 44th Electronic Components and Technology Conference最新文献

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Reliability development and qualification of a low-cost, PQFP-based MCM 基于pqfp的低成本MCM的可靠性开发和鉴定
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367632
P. Thompson
In Motorola's experience with commercial MCM customers, cost reduction is the largest driving factor for interest in MCMs. Speed and other performance factors are of secondary interest. Development and qualification can add significantly to the total cost of an MCM, so in addition to the normal desire to provide reliable products, the cost of doing so has gained increased importance. Motorola has identified three key factors in providing cost-effective MCMs: leverage single chip package experience, qualify MCM product families (package types), and use only qualified silicon devices in MCM products. This paper describes application of the three key factors to the reliability qualification of the 28 mm MCML Series package, a PQFP- (Plastic Quad Flat Pack) based MCM. An initial reliability evaluation was performed to investigate reliability issues. Subsequent to the results of the initial evaluation, changes were made to assembly processes and materials. The MCM was then submitted to a suite of reliability stresses selected to evaluate mechanical, thermomechanical, moisture and longevity performance. The MCM passed electrical and visual (SAT, or Scanning Acoustic Tomography) reliability requirements for all stresses, and performed well in extended stress tests as well. A procedure is in place to help insure high reliability for subsequent products in the 28 mm PQFP MCM package.<>
在摩托罗拉与商业MCM客户的经验中,成本降低是MCM的最大驱动因素。速度和其他性能因素是次要的。开发和认证会大大增加MCM的总成本,因此除了提供可靠产品的正常愿望之外,这样做的成本变得越来越重要。摩托罗拉确定了提供具有成本效益的MCM的三个关键因素:利用单芯片封装经验,合格的MCM产品系列(封装类型),以及在MCM产品中仅使用合格的硅器件。本文介绍了这三个关键因素在基于PQFP (Plastic Quad Flat Pack)的28 mm MCML系列封装可靠性鉴定中的应用。进行了初步的可靠性评估,以调查可靠性问题。根据初步评估的结果,对装配工艺和材料进行了更改。然后将MCM提交给一套可靠性应力,以评估机械、热机械、湿度和寿命性能。MCM通过了所有应力下的电气和视觉(SAT,或扫描声层析成像)可靠性要求,并在扩展应力测试中表现良好。一个程序到位,以帮助确保后续产品在28毫米PQFP MCM封装的高可靠性。
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引用次数: 4
Wire bonds over active circuits 有源电路上的导线键合
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367518
G. Heinen, R.J. Stierman, D. Edwards, L. Nye
A reliable process-for wire bonding over active integrated circuits, which are subsequently assembled in plastic packages, has been developed. This technology accommodates reducing the silicon die area required for bond pads and for on-chip bussing. Further, it supports area array wire bonding by allowing larger bond pads with relaxed pitch without sacrificing silicon area. This is accomplished by processing an additional metal layer on the wafer's protective overcoat for bond pad and bussing metallization. A stress buffer layer of polyimide is applied between the inorganic overcoat and top metal layer. Material characteristics and process requirements that are fully compatible with existing wafer fabrication technology and the wire bond technology required for assembly are defined. Design rules for implementing the process in new chip designs are given. Accelerated reliability tests performed on double-level metal logic devices show no degradation due to these new processes.<>
一种可靠的工艺——在有源集成电路上进行导线粘合,然后将其组装在塑料封装中,已经被开发出来。该技术可减少键合盘和片上总线所需的硅模面积。此外,它支持区域阵列线键合,允许更大的键合垫与轻松的间距,而不牺牲硅面积。这是通过在晶圆片的保护层上加工额外的金属层来完成的,用于键合垫和金属化。在无机涂层和顶部金属层之间施加聚酰亚胺应力缓冲层。定义了与现有晶圆制造技术和组装所需的线键技术完全兼容的材料特性和工艺要求。给出了在新芯片设计中实现该过程的设计规则。在双级金属逻辑器件上进行的加速可靠性试验表明,这些新工艺并未导致可靠性下降
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引用次数: 30
Tantalum chip capacitor reliability in high surge and ripple current applications 钽片电容器在高浪涌和纹波电流应用中的可靠性
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367527
E. Reed
Relentless miniaturization of electronic circuitry and the general movement from through-hole to surface-mount manufacturing have generated explosive growth in the use of surface mount tantalum chip capacitors. Many of these applications involve substantial exposure to surge and ripple currents. Such exposure invites questions regarding the impact of surge and ripple current on the long-term reliability of tantalum chip capacitors. To facilitate a better understanding of the impact of surge and ripple current on tantalum chip capacitor reliability, theoretical analyses of generic circuits are supported with discussion of experimental data. Simple circuits that highlight the fundamental theoretical principles behind transient surge and steady-state ripple current applications are analyzed and pertinent reliability issues are discussed. The relationship of device ESR (equivalent series resistance) to surge and ripple current robustness and device temperature rise is established theoretically. Surge and ripple current test and measurement methods are briefly discussed and experimental test data are used to support many of the insights that are drawn from theory.<>
电子电路的不断小型化和从通孔制造到表面贴装制造的普遍运动,使表面贴装钽片电容器的使用出现了爆炸式增长。许多这些应用涉及大量暴露于浪涌和纹波电流。这种暴露引发了关于浪涌和纹波电流对钽片电容器长期可靠性的影响的问题。为了更好地理解浪涌和纹波电流对钽片电容可靠性的影响,本文通过对实验数据的讨论来支持一般电路的理论分析。简单电路强调了瞬态浪涌和稳态纹波电流应用背后的基本理论原理,并讨论了相关的可靠性问题。从理论上建立了器件等效串联电阻ESR与浪涌和纹波电流稳健性和器件温升的关系。浪涌和纹波电流的测试和测量方法进行了简要的讨论,并使用实验测试数据来支持许多从理论得出的见解。
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引用次数: 22
Packaging relaxed semiconductor lasers with diluted waveguide structure 用稀释波导结构封装松弛半导体激光器
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367568
F. Choa, M. Shih, R. Kapre, W. Tsang, R. Logan
Without introducing extra processing steps, the idea of diluted waveguide is proposed and demonstrated to improve laser vertical modes. Such a new laser structures can simplify the work of laser-fiber coupling and relax the alignment tolerance. They may also be applied to obtain high power semiconductor lasers and polarization independent photonic devices.<>
在不引入额外处理步骤的情况下,提出并证明了稀释波导的思想可以改善激光的垂直模式。这种新型激光结构简化了激光-光纤耦合的工作,并放宽了对中公差。它们也可用于获得高功率半导体激光器和不依赖偏振的光子器件。
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引用次数: 1
Low-cost ceramic thin-film ball grid arrays 低成本陶瓷薄膜球栅阵列
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367656
M. Panicker, N. L. Greenman, J. Forster, P. Johnston
Ball grid array (BGA) is emerging as the next significant surface-mount package. This paper describes a simply structured, cost-effective ceramic BGA substrate, which conforms to current JEDEC registrations for flip-chip connections, as an alternative to multilayer co-fired ceramic BGA's. The BGA, processed on VIA/PLANE, a ceramic wafer with hermetic, tungsten-copper vias, uses a thin-film deposition technique, Enhanced Ion Plating (EIP). Controlled-Collapse Chip Connection (C4), solder-bumped flip chips are typically full or partial arrays of 5 mil solder bumps on 10 mil centers. This BGA transforms the C4 density to 35 mil bumps on 50 mil centers, much more compatible with current surface-mount assembly practices. The use of VIA/PLANE maintains the time-proven reliability of C4 on ceramic, and the flatness characteristics of VIA/PLANE eminently complement C4 and BGA technologies.<>
球栅阵列(BGA)正在成为下一个重要的表面贴装封装。本文描述了一种结构简单,具有成本效益的陶瓷BGA衬底,它符合当前用于倒装芯片连接的JEDEC注册,作为多层共烧陶瓷BGA的替代品。BGA在VIA/PLANE(一种具有钨铜密封过孔的陶瓷晶圆)上加工,采用薄膜沉积技术,增强离子镀(EIP)。可控塌缩芯片连接(C4),凸焊倒装芯片通常是在10密耳中心上的5密耳凸焊的全部或部分阵列。这种BGA将C4密度转换为35mil的凸点和50mil的中心,与当前的表面贴装组装实践更加兼容。VIA/PLANE的使用保持了C4在陶瓷上久经考验的可靠性,VIA/PLANE的平整度特性显著地补充了C4和BGA技术。
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引用次数: 2
Comparative compliance of a representative surface mount leadless solder connection and commercial lead designs 比较具有代表性的表面贴装无铅焊料连接和商业引线设计的合规性
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367645
R.W. Kotlowitz, A. Rizzo
The long-term reliability of surface mount (SM) solder interconnections remains an important issue in many critical electronics packaging applications. Compliant leads are typically post-attached to leadless ceramic chip carriers (LCCCs) and multichip modules (MCMs) to enhance the SM attachment reliability margin on organic substrates. The various lead-forms are commercially available in edge-clip, soldered, and thermocompression (TC) bonded designs for component attachment. Compliance evaluation was performed for a representative corner-most solder connection on a LCCC. The effective stiffness of the solder joint and commercial post-attached lead designs were compared in order to demonstrate the SM interconnection reliability advantage provided by certain edge-clip and TC-bonded lead-forms. Commercial high-compliance edge-clip, soldered, and TC-bonded lead designs have diagonal-direction stiffness between nominally 10-40 lb/in, prior to circuit-board attachment. The compliant leads accommodate a large part of the component-substrate thermal expansion mismatch, significantly reducing the cyclic loads transmitted to the comparatively noncompliant solder connections. The diagonal stiffness results for the corner-most solder joint are specific for the particular contour and dimensions of the FE structural model. However, the current study provides fundamental understanding of the compliance advantage of post-attached leads compared to leadless SM interconnections.<>
在许多关键的电子封装应用中,表面贴装(SM)焊料互连的长期可靠性仍然是一个重要问题。兼容引线通常在后接在无引线陶瓷芯片载体(LCCCs)和多芯片模块(mcm)上,以提高有机基板上的SM连接可靠性余量。各种引线形式是市售的边缘夹,焊接和热压(TC)粘合设计的组件附件。对LCCC上具有代表性的最边角焊料连接进行了符合性评估。比较了焊点的有效刚度和商用后接引线设计,以证明某些边夹和tc连接引线形式提供的SM互连可靠性优势。在电路板连接之前,商用高遵从性的边夹、焊接和tc键合引线设计的对角线方向刚度在10-40磅/英寸之间。兼容的引线可容纳大部分组件-衬底热膨胀不匹配,显著减少传递到相对不兼容的焊料连接的循环载荷。最边角焊点的对角刚度结果是特定于有限元结构模型的特定轮廓和尺寸的。然而,目前的研究对后接引线与无引线SM互连相比的依从性优势提供了基本的理解。
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引用次数: 2
A 1024-pin plastic ball grid array for flip chip die 用于倒装芯片的1024针塑料球栅阵列
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367655
A. Switky, V. Sajja, J. Darnauer, W. Dai
Described in this paper is a 1024-pin ball grid array package (BGA) that contains an area array die flip-chip mounted to a silicon transposer. The transposer, which fans the area array to two rows of pads on its periphery, is wire bonded to a printed circuit board substrate. Mechanical and electrical design considerations of the BGA are discussed, as well as the results of SPICE models.<>
本文描述了一种1024针球栅阵列封装(BGA),它包含一个安装在硅转座上的区域阵列芯片倒装芯片。所述转座,其将所述区域阵列扇成其外围的两排焊盘,是用导线粘合到印刷电路板基板上的。讨论了BGA的机械和电气设计考虑因素,以及SPICE模型的结果
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引用次数: 0
Fracture properties of molding compound materials for IC plastic packaging IC塑料封装成型复合材料的断裂性能
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367635
J. Sauber, L. Lee, S. Hsu, T. Hongsmatip
The technique of linear elastic fracture mechanics was employed to characterize the fracture toughness of different molding compound materials. The effect of fast thermal loading rate as in a wave soldering condition was studied by performing the fracture toughness tests at different mechanical loading speeds. The effects of storage conditions and accelerated testing environments were studied by varying the test temperatures from liquid nitrogen temperature to 150/spl deg/C. Models were built of 208 I/O PQFP devices with cracks in the molding compound at the corner of the die pad. These models were solved to evaluate the effect of CTE mismatches, initial flaw sizes and die pad delamination on molding compound stress intensity factors. Finite element results were then compared with crack growth measurements from PQFP packages which had been subjected to accelerated thermal cycling.<>
采用线弹性断裂力学方法对不同成型复合材料的断裂韧性进行了表征。通过不同机械加载速度下的断裂韧性测试,研究了波峰焊条件下快速热加载速率的影响。通过将试验温度从液氮温度变化到150℃,研究了贮藏条件和加速试验环境的影响。建立了208个I/O PQFP器件的模型,模垫角处的成型化合物存在裂纹。对这些模型进行求解,以评估CTE错配、初始缺陷尺寸和模垫分层对成型复合应力强度因子的影响。然后将有限元结果与经过加速热循环的PQFP封装的裂纹扩展测量结果进行比较。
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引用次数: 24
CBGA package design for C4 PowerPC microprocessor chips: trade-off between substrate routability and performance C4 PowerPC微处理器芯片的CBGA封装设计:衬底可达性与性能之间的权衡
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367646
W. Huang, J. Casto
Electrical performance and printed circuit board routability tradeoff are studied in ceramic ball grid array packages (CBGAs). CBGA package design is described for a high speed chip with peripheral drivers. Three general types of array patterns are compared. First, the best routability design, where all the power and ground balls on the CBGA are routed in the center area. Second, a design with four pairs of P/G balls moved to the corners of the CBGA is evaluated, resulting in improvement of electrical performance by 50%, as measured by SSN reduction. The reasons for this improvement are analyzed. Third, even more P/G balls are moved closer to the onchip drivers, achieving an additional 30% reduction in SSN. In each case, the implications on board routability and simultaneous switching noise are assessed.<>
研究了陶瓷球栅阵列封装(CBGAs)的电气性能和电路板可达性权衡。介绍了一种带外设驱动的高速芯片的CBGA封装设计。比较了三种一般类型的阵列模式。首先,最好的可路由性设计,在CBGA上所有的电源和滚地球都路由在中心区域。其次,评估了将四对P/G球移至CBGA角落的设计,通过减少SSN来测量电性能提高了50%。分析了这种改善的原因。第三,更多的P/G球被移动到更靠近片上驱动器的位置,从而使SSN进一步降低30%。在每种情况下,对板上可达性和同时切换噪声的影响进行了评估
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引用次数: 5
Surge/noise suppression within electrical connectors 电连接器内的浪涌/噪声抑制
Pub Date : 1994-05-01 DOI: 10.1109/ECTC.1994.367625
E. Paulus
As electronic systems become more sensitive and sophisticated, they also become more susceptible to upset or failure caused by stray transient surges and noise. This is partially due to the use of integrated circuits and other vulnerable components. Suppression is therefore a vital part of today's military and commercial electronic systems. This article covers the methods of suppression which can be integrated within electrical connectors, how this is accomplished, the corresponding electrical performance, and the details needed for proper documentation.<>
随着电子系统变得越来越敏感和复杂,它们也变得越来越容易受到干扰或故障引起的杂散瞬态浪涌和噪声。这部分是由于使用集成电路和其他易受伤害的组件。因此,抑制是当今军事和商业电子系统的重要组成部分。本文涵盖了可以集成在电连接器中的抑制方法,如何实现,相应的电气性能以及适当文档所需的详细信息。
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引用次数: 0
期刊
1994 Proceedings. 44th Electronic Components and Technology Conference
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