New Equipment | Industrial Automation
Select the right products & services to meet your needs! PLeases contact us Email:unity*mvme.cn(pls change * to @) Contact: Sandy Lin Email:unity*mvme.cn(pls change * to @) Skype:onlywnn_1 Telegram:+8618020776786 Mobile(Whatsapp): (+86)-180207
New Equipment | Industrial Automation
Select the right products & services to meet your needs! PLeases contact us Email:unity*mvme.cn(pls change * to @) Contact: Sandy Lin Email:unity*mvme.cn(pls change * to @) Skype:onlywnn_1 Telegram:+8618020776786 Mobile(Whatsapp): (+86)-180207
New Equipment | Industrial Automation
Select the right products & services to meet your needs! PLeases contact us Email:unity@mvme.cn Contact: Sandy Lin Email:unity@mvme.cn Skype:onlywnn_1 Telegram:+8618020776786 Mobile(Whatsapp): (+86)-18020776786 QQ :2851195456 Product： Quality
New Equipment | Industrial Automation
Select the right products & services to meet your needs! PLeases contact us Email:unity@mvme.cn Contact: Sandy Lin Email:unity@mvme.cn Skype:onlywnn_1 Telegram:+8618020776786 Mobile(Whatsapp): (+86)-18020776786 QQ :2851195456 Product： Quality
Events Calendar | Wed May 10 00:00:00 EDT 2017 - Wed May 10 00:00:00 EDT 2017 | Itasca, Illinois USA
Kester to Host Technical Rework Seminar
Technical Library | 2015-07-14 13:19:10.0
Bottom terminated components (BTC) are leadless components where terminations are protectively plated on the underside of the package. They are all slightly different and have different names, such as QFN (quad flat no lead), DFN (dual flat no lead), LGA (land grid array) and MLF (micro lead-frame. BTC assembly has increased rapidly in recent years. This type of package is attractive due to its low cost and good performance like improved signal speeds and enhanced thermal performance. However, bottom terminated components do not have any leads to absorb the stress and strain on the solder joints. It relies on the correct amount of solder deposited during the assembly process for having a good solder joint quality and reliable reliability. Voiding is typically seen on the BTC solder joint, especially on the thermal pad of the component. Voiding creates a major concern on BTC component’s solder joint reliability. There is no current industry standard on the voiding criteria for bottom terminated component. The impact of voiding on solder joint reliability and the impact of voiding on the heat transfer characteristics at BTC component are not well understood. This paper will present some data to address these concerns.
Technical Library | 2018-09-26 20:33:26.0
Bottom terminated components, or BTCs, have been rapidly incorporated into PCB designs because of their low cost, small footprint and overall reliability. The combination of leadless terminations with underside ground/thermal pads have presented a multitude of challenges to PCB assemblers, including tilting, poor solder fillet formation, difficult inspection and – most notably – center pad voiding. Voids in large SMT solder joints can be difficult to predict and control due to the variety of input variables that can influence their formation. Solder paste chemistries, PCB final finishes, and reflow profiles and atmospheres have all been scrutinized, and their effects well documented. Additionally, many of the published center pad voiding studies have focused on optimizing center pad footprint and stencil aperture designs. This study focuses on I/O pad stencil modifications rather than center pad modifications. It shows a no-cost, easily implemented I/O design guideline that can be deployed to consistently and repeatedly reduce void formation on BTC-style packages.
Industry News | 2017-05-15 15:57:19.0
Nikon Metrology has recently provided its high-precision, flat-panel based X-ray inspection system, XT V 160 to help Michigan company, Saline Lectronics inspect its most complex and challenging technical assemblies to the highest standard.
Industry News | 2021-05-10 02:50:10.0
BSU Inc. has updated its high-performance X-ray inspection capability with the installation of a Nikon XT V Series world-class X-ray and CT inspection system. In addition to inspecting many areas of SMT/PCB assemblies that are generally inaccessible to visual inspection, the new X-ray system will be used to inspect Ball Grid Array (BGA), leadless, and connector components to identify problems such as solder joint defects, shorts, opens, etc...
