Technical Library | 2020-11-24 23:01:04.0
The miniaturization trend is driving industry to adopting low standoff components or components in cavity. The cost reduction pressure is pushing telecommunication industry to combine assembly of components and electromagnetic shield in one single reflow process. As a result, the flux outgassing/drying is getting very difficult for devices due to poor venting channel. This resulted in insufficiently dried/burnt-off flux residue. For a properly formulated flux, the remaining flux activity posed no issue in a dried flux residue for no-clean process. However, when venting channel is blocked, not only solvents remain, but also activators could not be burnt off. The presence of solvents allows mobility of active ingredients and the associated corrosion, thus poses a major threat to the reliability. In this work, a new halogen-free no-clean SnAgCu solder paste, 33-76-1, has been developed. This solder paste exhibited SIR value above the IPC spec 100 MΩ without any dendrite formation, even with a wet flux residue on the comb pattern. The wet flux residue was caused by covering the comb pattern with 10 mm × 10 mm glass slide during reflow and SIR testing in order to mimic the poorly vented low standoff components. The paste 33-76-1 also showed very good SMT assembly performance, including voiding of QFN and HIP resistance. The wetting ability of paste 33-76-1 was very good under nitrogen. For air reflow, 33-76-1 still matched paste C which is widely accepted by industry for air reflow process. The above good performance on both non-corrosivity with wet flux residue and robust SMT process can only be accomplished through a breakthrough in flux technology.
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Water-based, alkaline defluxing for semiconductor electronics HYDRON® SE 230A is a water-based, single-phase cleaning agent specifically developed for the use in dip tank processes. It removes flux residues from a wide range of semiconductor electro
BEST IPC J-STD-001 Revision F training kits feature REAL circuit boards that represent actual soldering conditions. This kit features "062 thick multilayer boards which are more representative of the thermal conditions of "real" circuit boards. This
Industry News | 2015-09-22 11:52:54.0
PennEngineering® has been awarded U.S. Patent No. 9,113,567 for a unique three-piece heat sink mounting system designed to securely attach heat sinks to printed circuit boards while providing firm and constant contact to the chip component for optimized heat dissipation. The inventor of this dynamic mounting system is Robert F. Stotz, Jr.
Commercial-off-the-shelf (COTS) PC/104 and PC/104-Plus computer cards and components, including x86 and PowerPC CPUs; DC/DC converter power supplies and interfaces; fan cards and heatsinks; digital I/O and mass storage boards; fieldbus interfaces (C
New Equipment | Cleaning Equipment
The Nu/Clean Inline Aqueous Cleaners have been leading the industry for decades! The Nu/Clean Inline cleaners feature such innovations as our award winning and patented Flood Box that provides the best cleaning results for low standoff components an
New PEM® ReelFast® Brass Surface Mount Fasteners for PC Boards Provide Superior Electrical and Mechanical Attachment Points New PEM® ReelFast® brass surface mount fasteners from PennEngineering® introduce ideal hardware solutions for printed cir
New Equipment | Cleaning Agents
IONOX® I3955 is a precision vapor cleaning solvent designed as a drop in replacement for modern era vapor degreasing equipment. IONOX® I3955 is effective in removing no clean and rosin flux residues from electronic assemblies including low stand-off
Product Name : SMT Nut & Stand_Off Product Description This is a surface automatic mount nut nozzle structure, the department used to draw the nut so that surface automatic mount operation, comprising: a hollow tube, one end terminating mouth with