Technical Library | 2013-02-08 22:56:47.0
Solder voiding is present in the majority solder joints and is generally accepted when the voids are small and the total void content is minimal. X-ray methods are the predominate method for solder void analysis but this method can be quite subjective for non grid array components due to the two dimensional aspects of X-ray images and software limitations. A novel method of making a copper "sandwich" to simulate under lead and under component environs during reflow has been developed and is discussed in detail. This method has enabled quantitative solder paste void analysis for lead free and specialty paste development and process refinement. Profile and paste storage effects on voiding are discussed. Additionally an optimal design and material selection from a solder void standpoint for a heat spreader on a BCC (Bumpered Chip Carrier) has been developed and is discussed.
Technical Library | 2017-06-29 16:39:30.0
Currently there is no industry standard test method for measuring dielectric properties of circuit board materials at frequencies greater than about 10 GHz. Various materials vendors and test labs take different approaches to determine these properties. It is common for these different approaches to yield varying values of key properties like permittivity and loss tangent. The D-24C Task Group of IPC has developed this round robin program to assess these various methods from the "bottom up" to determine if standardized methods can be agreed upon to provide the industry with more accurate and valid characteristics of dielectrics used in high-frequency and high-speed applications.
Technical Library | 2015-04-16 16:11:43.0
Solder ball height inspection is essential to the detection of potential connectivity issues in semi-conductor units. Current ball height inspection tools such as laser profiling, fringe projection and confocal microscopy are expensive, require complicated setup and are slow, which makes them difficult to use in a real-time manufacturing setting. Therefore, a reliable, in-line ball height measurement method is needed for inspecting units undergoing assembly. (...) In this paper, an automatic, stereo vision based, in-line ball height inspection method is presented. The proposed method includes an imaging setup together with a computer vision algorithm for reliable, in-line ball height measurement.
Technical Library | 2017-05-31 18:19:44.0
These guidelines give the assembly team a standardized, no-nonsense method to produce a reliable panelization solution. By eliminating panelization guesswork, you ensure successful assembly even for complex projects.
Technical Library | 2010-09-23 20:23:37.0
Methods of effective and ecological recycling of printed circuit boards (PCBs) are searched all over the world at this time. The material composition and temperature properties of PCB are necessary to be known for an optimal recycling technology. For thi
Technical Library | 2010-11-18 19:19:50.0
In this article we present both a relatively new and innovative family of packages that is suitable for medium pin count needs and an innovative method for fabricating the substrates for such a package. With respect to lead count, this packaging family is
Technical Library | 2012-06-01 00:08:44.0
Recession survival tips on how and why not to cut training. ... About the methods for US Manufacturing Industry to adjust for the knowledge vacuum caused by retiring baby boomers with training, while dealing with tight training budgets during a recessio
Technical Library | 2021-08-11 00:57:57.0
This paper shows the Design and Finite Element analysis of vacuum chamber of potting machine designed for electronic ignition coil applications. There are two types of potting methods 1) With Vacuum 2) Without Vacuum.
Technical Library | 2022-10-31 08:25:43.0
Material: Iron Model Name: NSC CHUCK Top Quality: 180g Automatic / Manual: Automatic Specification: Original New，copy New Shipping Method: FedEx, DHL, Etc.
Technical Library | 2013-10-13 10:22:48.0
There are numerous factors which directly affect the conformal coating process to greater or lesser degrees. Those which have major impacts irrespective of the substrate / PCB and assemblies include choice of coating material and method of application. Whether conformal coating boards by dip, robot, batch spray or brush methods the viscosity of the coating is a critical factor in the overall process control.
