For everything from high volume, low cost capacitors to application specific ceramic solutions, Johanson Dielectrics has you covered. The mission of the Johanson Companies is to translate our customer needs into quality electronic components, produ
New Equipment | Assembly Services
China Double Sided Circuit Boards Fabricaiton and Assembly PCBA Turnkey Manufacturer 2 Layers circuit boards PCB FR4 1.6mm PCB fabrication and assembly 1oz PCB copper thickness Shenzhen PCB and PCBA manufacturer China turnkey contract electroni
Electronics Forum | Thu Apr 22 07:51:32 EDT 1999 | Vic Lau
after soldering transistors on a flex circuit (Ni/Au plated), one of the lead lift-up from the pad. under microscope (1,000 X), i find some cracks on the the pad surface. with edx analysis, the surface is mainly nickel. have you ever encounter suc
Electronics Forum | Tue Mar 21 20:25:30 EST 2000 | Dave F
John: What�s the matter? Free gold � good thing for you, bad thing for your supplier. :^) Pre-tinning of gold plated leads is important to: � Prevent gold embrittlement of the solder joint � Determine if the leads are solderable prior to assembly (
Used SMT Equipment | Soldering - Reflow
Intelligent hot air lead-free reflow Oven with six heating-zones TN360C Instruction: 1: Heating system: TN360C adopts high effective nickel-chromium heating tube with advanced technology and Long life service. The hot-air circle system wh
Industry News | 2012-01-13 13:27:59.0
The SMT stencil market has a slew of new options in foil materials, coatings and cutting technologies, all of which promise to improve the solder paste printing process. Which of these options really do help assemblers keep yields up and costs down, and which don’t?
Industry News | 2013-06-07 15:41:36.0
IPC Study of Quality Benchmarks for the Electronics Manufacturing Services (EMS) Industry for 2013 is now available from IPC — Association Connecting Electronics Industries®. T
Technical Library | 2023-08-04 15:27:30.0
A designed experiment evaluated the influence of several variables on appearance and strength of Pb-free solder joints. Components, with leads finished with nickel-palladium-gold (NiPdAu), were used from Texas Instruments (TI) and two other integrated circuit suppliers. Pb-free solder paste used was tin-silver-copper (SnAgCu) alloy. Variables were printed wiring board (PWB) pad size/stencil aperture (the pad finish was consistent; electrolysis Ni/immersion Au), reflow atmosphere, reflow temperature, Pd thickness in the NiPdAu finish, and thermal aging. Height of solder wetting to component lead sides was measured for both ceramic plate and PWB soldering. A third response was solder joint strength; a "lead pull" test determined the maximum force needed to pull the component lead from the PWB. This paper presents a statistical analysis of the designed experiment. Reflow atmosphere and pad size/stencil aperture have the greatest contribution to the height of lead side wetting. Reflow temperature, palladium thickness, and preconditioning had very little impact on side-wetting height. For lead pull, variance in the data was relatively small and the factors tested had little impact.
Technical Library | 2014-11-06 16:43:24.0
This paper summarizes the results of recent investigations to examine the effect of electroless nickel process variations with respect to Pb-free (Sn-3.0Ag-0.5Cu) solder connections. These investigations included both ENIG and NiPd as surface finishes intended for second level interconnects in BGA applications. Process variations that are suspected to weaken solder joint reliability, including treatment time and pH, were used to achieve differences in nickel layer composition. Immersion gold deposits were also varied, but were directly dependent upon the plated nickel characteristics. In contrast to gold, different electroless palladium thicknesses were independently achieved by treatment time adjustments.
SMTnet Express, November 6, 2014, Subscribers: 23500, Members: Companies: 14091, Users: 37109 Effect of Process Variations on Solder Joint Reliability for Nickel-based Surface Finishes Hugh Roberts, Sven Lamprecht, Gustavo Ramos, Christian Sebald
SMTnet Express, August 7, 2014, Subscribers: 23058, Members: Companies: 13975, Users: 36604 Gold Embrittlement In Lead-Free Solder. Craig Hillman, Nathan Blattau, Joelle Arnold, Thomas Johnston, Stephanie Gulbrandsen; DfR Solutions , Julie Silk
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/jstd001-plated-throughhole-obstruction_topic2145_post9247.html
J-STD-001: Plated Through-hole Obstruction - PCB Libraries Forum Forum Home > Libraries > Footprints / Land Patterns New Posts FAQ Search Events Register Login J-STD-001: Plated Through-hole Obstruction
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COT specializes in high quality SMT nozzles and consumables for pick and place machines. We provide special engineering design service of custom nozzles for those unique and odd components.
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