New Equipment | Fabrication Services
PCB manufacturer---Hitech Circuits Co., Limited is a PCB manufacturer from China and we focus on multilayer printed circuit board; High density PCB /HDI, hard gold board; Flexible board / FPCB; Bergquist Aluminum based board, Aluminium PCB, Aluminum
Technical Library | 2018-05-09 22:15:29.0
Creep corrosion on printed circuit boards (PCBs) is the corrosion of copper metallization and the spreading of the copper corrosion products across the PCB surfaces to the extent that they may electrically short circuit neighboring features on the PCB. The iNEMI technical subcommittee on creep corrosion has developed a flowers-of-sulfur (FOS) based test that is sufficiently well developed for consideration as an industry standard qualification test for creep corrosion. This paper will address the important question of how relative humidity affects creep corrosion. A creep corrosion tendency that is inversely proportional to relative humidity may allow data center administrators to eliminate creep corrosion simply by controlling the relative humidity in the data center,thus, avoiding the high cost of gas-phase filtration of gaseous contamination. The creep corrosion relative humidity dependence will be studied using a modified version of the iNEMI FOS test chamber. The design modification allows the achievement of relative humidity as low as 15% in the presence of the chlorine-releasing bleach aqueous solution. The paper will report on the dependence of creep corrosion on humidity in the 15 to 80% relative humidity range by testing ENIG (gold on electroless nickel), ImAg (immersion silver) and OSP (organic surface preservative) finished PCBs, soldered with organic acid flux.
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 | 2024-04-08 15:46:36.0
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.
Industry News | 2009-05-18 17:19:51.0
GREELEY, CO - FCT Assembly debuts WS159 water-soluble solder paste, featuring FCT's latest technology in print and reflow of paste in the water soluble category.
Industry News | 2009-05-20 19:17:30.0
GREELEY, CO �FCT Assembly introduces WS177 lead-free water-soluble solder paste featuring its latest technology in print and reflow of paste in the water-soluble category for lead-free alloys.
Industry News | 2008-05-30 14:53:00.0
NASHVILLE � May 30, 2008 � Kyzen Corporation, a world leading provider of environmentally responsible precision cleaning products for the electronics and high-technology manufacturing operations, announces that it will display AQUANOX A4625 Aqueous Cleaner for Lead-Free Flux Residues and METALNOX M6440 aqueous immersion cleaner and brightener in booth 3030 at the Medical Design & Manufacturing (MD&M) East 2008 exhibition and conference, scheduled to take place June 3-5, 2008 at the Jacob K. Javits Convention Center in New York.
Industry News | 2011-01-18 13:46:21.0
Time and again, a major challenge lies in attaching integrated circuits (ICs) to highly integrated circuit board substrates in a space-saving manner. Würth Elektronik took this challenge on and found an ideal solution with the ESC (encapsulated solder connection) process. The chips are soldered and at the same time glued 'face-down" in their exact position.
Industry News | 2015-12-28 17:22:37.0
Nihon Superior will exhibit in East Hall 1 E3-18 at NEPCON Japan, scheduled to take place Jan. 13-15, 2016 at the Tokyo Big Site in Japan. The reliability of SN100C has been proven in a wide range of electronics assembly products. The eutectic character of the silver-free SN100C alloy and the associated high fluidity provides faster wetting and increased spreadability over SAC305, which is beneficial in wave soldering and hand soldering applications as well as in reflow.
Industry News | 2017-08-10 17:43:56.0
Nihon Superior Co. announces its Nihon Superior Shanghai subsidiary will exhibit in Booth #1G08 at NEPCON South China, scheduled to take place August 29-31, 2017 at the Shenzhen Convention & Exhibition Center. The reliability of SN100C has been proven in a wide range of electronics assembly products. The eutectic character of the silver-free SN100C alloy and the associated high fluidity provides faster wetting and increased spreadability over SAC305.
