Electronics Forum | Thu Jun 23 22:30:31 EDT 2005 | wjxingggg
poor soldering of PCB. > unfit stencil hole of QFN > incoming problem for this component >...... What is your opinion? or what can I do for the next step? Thanks again.
Electronics Forum | Fri Jun 24 07:02:35 EDT 2005 | davef
Problem 1: Solder shortage * Stencil aperatures [except the heat slug] should be 1:1 with the board. * Stencil should be 5 thou thick laser cut. * Board should be 1:1 with the component * Print should look good. Problem #2: Bad connection between p
Industry News | 2011-09-06 13:07:52.0
IPC and six IPC-member companies have agreed to participate in a pilot evaluation program to review and refine the Organization for Economic Cooperation and Development (OECD) due diligence guidance for conflict minerals.
Industry News | 2008-03-14 18:33:26.0
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Technical Library | 2017-06-01 17:12:08.0
The corrosion of Nickel-Palladium-Gold (Ni-Pd-Au) finish terminals in humid environments is known to be reduced with the application of a conformal coating such as acrylic. Corrosion has a higher rate of occurrence around the terminal ‘knee’ of a surface mount component, which may be reduced with the application of conformal coatings. Although radio frequency (RF) plasma processing is generally known to enhance conformity of conformal coating to surfaces through ionic bombardment, the effect on the functionality of assembled printed circuit boards (PCB) is not as well known. The purpose of this study is to assess whether RF plasma processing can enhance the adhesive and coverage qualities of an acrylic conformal coating on PCBs, specifically on Ni-Pd-Au terminals with a knee, and if plasma processing has an effect on the electrical functionality of components and fully assembled PCB.
Technical Library | 2019-12-30 02:09:39.0
How to choose the material of PCB ? The choice of PCB material must meet the design requirements, the quality of production and cost need to achieve a balance. The design requirements include electrical and institutional parts. This material problem is usually important when designing very high speed PCB boards (frequencies greater than GHz). For example, the commonly used FR-4 material may not be used when dielectric loss at several GHz frequencies, which can have a significant effect on signal attenuation . In the case of electrical, it is important to note whether the dielectric constant and the dielectric loss are combined at the designed frequency
SMTnet Express, April 14, 2022, Subscribers: 25,694, Companies: 11,564, Users: 27,181 iNEMI Webinar 07.07.2021 - PCB Cleaning Agenda: Why Cleaning of electronic assemblies?, Cleaning processes, Cleaning process monitoring, Process
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/efd/resource-center/solder-glossary-of-terms
product remains fit for use. Surface Insulation Resistance (SIR) Test defined in IPC TM-650 2.6.3.3 used to classify flux. Flux is reflowed on a set of interdigitated traces and an electrical potential is supplied. A passing test maintains a resistance
Surface Mount Technology Association (SMTA) | https://www.smta.org/knowledge/journal.cfm
Shorey Abstract 30-4 1000 Days of Testing Tin Whiskering PCB Assemblies to Determine the Suitability of Conformal Coatings to Mitigate Against Shorting Martin Wickham, Adam Lewis and Kate Clayton
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