Bicheng Enterprise Company is an established supplier and solution provider of high quality printed circuit boards(PCB). We offer prototypes and middle volume to large production including TG170, MCPCB and RO4350B material. etc.
New Equipment | Industrial Automation
Sales Manager: Sandy Lin Email: unity@mvme.cn Skype: onlywnn_1 Mobile(Whatsapp): (+86)-18020776786 XIAMEN YUEHANG COMPUTER ENGINEERING CO.LTD. is a company that professionally engaged in large system DCS spare parts supply. We supply DCS, PLC, M
Electronics Forum | Mon Nov 20 04:39:19 EST 2000 | SV
Hello, I have to design a PCB for which the customer have the following temperature requirements: -55degC to +85degC operating temp. -61degC to +125degC storage temp. My question is: does the FR4 material meet this conditions? Which are the parame
Electronics Forum | Thu Aug 24 15:54:13 EDT 2006 | davef
It depends. What is: * Storage environment and period * Board laminate, epoxy, and copper thickness of PTH * Down stream process * Etc FR4 0.062" thick boards absorb between 0.08 to 0.1%Wt of moisture within a 24 hour period, and 0.2 to 0.23%Wt in
Industry News | 2018-10-18 10:43:28.0
Suggested 14 and 16 Layer Board Layouts
Industry News | 2018-10-18 11:07:09.0
What is the Maximum Panel Size for PCB Printing?
Technical Library | 2022-10-11 20:29:31.0
Electronic assemblies deployed in harsh environments may be subjected to multiple thermal environments during the use-life of the equipment. Often the equipment may not have any macro-indicators of damage such as cracks or delamination. Quantiication of thermal environments during use-life is often not feasible because of the data-capture and storage requirements, and the overhead on core-system functionality. There is need for tools and techniques to quantify damage in deployed systems in absence of macro-indicators of damage without knowledge of prior stress history. The presented PHM framework is targeted towards high reliability applications such as avionic and space systems. In this paper, Sn3.0Ag0.5Cu alloy packages have been subjected to multiple thermal cycling environments including -55 to 125C and 0 to 100C. Assemblies investigated include area-array packages soldered on FR4 printed circuit cards. The methodology involves the use of condition monitoring devices, for gathering data on damage pre-cursors at periodic intervals. Damage-state interrogation technique has been developed based on the Levenberg-Marquardt Algorithm in conjunction with the microstructural damage evolution proxies. The presented technique is applicable to electronic assemblies which have been deployed on one thermal environment, then withdrawn from service and targeted for redeployment in a different thermal environment. Test cases have been presented to demonstrate the viability of the technique for assessment of prior damage, operational readiness and residual life for assemblies exposed to multiple thermo-mechanical environments. Prognosticated prior damage and the residual life show good correlation with experimental data, demonstrating the validity of the presented technique for multiple thermo-mechanical environments.
Full Automatic V-cut PCB Depaneler Introduction: This equipment can further improve the quality of depaneling. It can realize V-groove XY two-way automatic cutting, cutting aluminum & FR4 boards without burr, can connect the assembly line to realize
This video is on the repair of damaged corners presented by the professional instructing staff at BEST Inc. Corners get damaged from improper handling, storage or packaging. The repair of these damaged corners for multiple angles including both abov
SMTnet Express, March 3, 2022, Subscribers: 25,842, Companies: 11,529, Users: 27,083 Component Reliability After Long Term Storage Each year the semiconductor industry routes a significant volume of devices to recycling sites
Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2022/06/Optimizing-Reflowed-Solder-TIM-sTIMs-Processes-for-Emerging-Heterogeneous.pdf
(m.p. of indium is 157°C) shows the oxide layer growing to 2 nm in 5 minutes. This increases to 4 nm after 2 hours, and this number is used as an upper bound of oxidation during storage. V. OXIDE REMOVAL AND FLUXING In sTIM reflow, indium oxide (In2O3
40731 | https://www.smta.org/smtai/SMTAI-2019-Technical-Program.pdf?v=200609010628
Surface Mount Technology Association (SMTA)