Technical Library | 2020-03-09 10:50:17.0
A customer called the Helpline seeking advice for cleaning no-clean fluxes prior to applying a conformal coating. The customer's assemblies were manufactured with a no-clean rosin based solder paste (ROL0) and were cleaned with an isopropyl alcohol (IPA) wash. After cleaning, a white residue was sometimes found in areas with high paste concentrations and was interfering with the adhesion of the conformal coating (Figure 1). For conformal coatings to adhere properly, the printed circuit board (PCB) surface must be clean of fluxes and other residues. In addition, ionic contamination left by flux residues can lead to corrosion and dendrite growth, two common causes of electronic opens and shorts. Other residues can lead to unwanted impedance and physical interference with moving parts.
https://www.ascen.ltd/Products/conformal_coating_equipment//579.html PCB conformal coating machine selective coating process for PCBA, PCB coating machine protective coating,to protect the sensitive components: from external environmental factors,vib
ACI Technologies Inc. (ACI) is a scientific research corporation dedicated to the advancement of electronics manufacturing processes and materials for The Department of Defense and industry. This video provides an overview of our commercial service
Training Courses | | | PCB Design Courses
The PCB design courses teach students the process, techniques and tools needed to design layout of printed circuit boards.
Technical Library | 2019-06-04 10:19:46.0
Interconnection technology relies very heavily on the ability of the conductors on a printed wiring assembly to maintain reliable signal integrity. Harsh environmental factors can precipitate a loss of conductivity due to oxidation and corrosion. Connections are typically soldered or inserted using pressure fitted connectors to obtain enough surface contact to meet the electrical conductivity requirements. In pressure contacts, surface integrity is especially critical where the abrasive effects of retraction and insertion can wear off the metallic finish from the contact area. This can expose the underlying copper or nickel and lead to increased resistance at the contact points. These types of conductors are frequently found in card edge connectors where the terminations are plated with a layer of nickel and gold (frequently referred to as gold fingers). A hard gold is typically used containing very small amounts of nickel and cobalt to increase the wear resistance.
Technical Library | 2019-10-21 09:58:50.0
An ACI Technologies customer inquired regarding printed circuit board(PCB) failures that were becoming increasingly prevalent after the SMT (surface mount technology) manufacturing process. The failures were detected by electrical testing, but were undetermined as to the location and specific devices causing the failures. The failures were suspected to be caused predominately in the BGA (ball grid array) devices located on specific sites on this 16 layer construction. Information that was provided on the nature of the failures (i.e., opens or shorts) included high resistance shorts that were occurring in those specified areas. The surface finish was a eutectic HASL (hot air solder leveling) and the solder paste used was a water soluble Sn/Pb(tin/lead).
Industry News | 2018-12-18 20:24:14.0
The best technical conference paper of IPC APEX EXPO® 2019 has been selected. Voted on through a ballot process by members of the IPC APEX EXPO Technical Program Committee, the paper authors will receive their awards during the opening keynote session on Tuesday, January 29, 2019.
Industry News | 2017-04-11 21:32:40.0
SMTA and SMART Group announce experts from IBM Corporation and Siemens AG will keynote the Contamination, Cleaning and Coating Conference. The conference is scheduled May 22-24, 2017 at the Radisson Blu Airport Hotel in Amsterdam.
Events Calendar | Wed Jul 13 00:00:00 EDT 2022 - Wed Jul 13 00:00:00 EDT 2022 | Oshkosh, Wisconsin USA
Wisconsin Chapter: PCB Workshop and PCB Plant Tour
Events Calendar | Tue May 30 00:00:00 EDT 2023 - Tue May 30 00:00:00 EDT 2023 | ,
Ontario Webinar: Microvia Reliability - Understanding the Effects of Process, Design & Materials
The SMTA membership is a network of professionals who build skills, share practical experience and develop solutions in electronic assembly technologies and related business operations.
Training Provider / Events Organizer / Association / Non-Profit
6600 City W Pkwy
Eden Prairie, MN USA
Phone: 952-920-7682
