Electronics Forum | Tue Jun 01 07:26:55 EDT 2004 | johnwnz
Alistair, your paste deposit is controlled by a few things: Stencil thickness Squeegee pressure Squeegee speed Print gap in 99 out of 100 applications for paste printing you would have a print gap of 0 i.e. on contact printing where the PCB is in fu
Electronics Forum | Fri May 20 03:14:03 EDT 2016 | designhaus
Hello, We are about receive an 85.000 USD award grant towards purchasing manufacturing or testing equipment for our company. We are trying to figure out how to best use this grant. Here are short facts about us: We are a design house, so all our ma
Industry News | 2014-06-22 19:12:37.0
MIRTEC, “The Global Leader in Inspection Technology,” will exhibit in Booth #5444-1 at SEMICON West 2014, scheduled to take place July 8-10 at the Moscone Center in San Francisco, CA.
Industry News | 2012-01-23 00:02:12.0
MIRTEC, “The Global Leader in Inspection Technology”, will premier its complete line of 3D AOI, SPI, X-ray and LED inspection systems at the IPC APEX Expo in booth #3637.
Technical Library | 2020-08-27 01:22:45.0
Initially adopted internal specifications for acceptance of printed circuit boards (PCBs) used for wire bonding was that there were no nodules or scratches allowed on the wirebond pads when inspected under 20X magnification. The nodules and scratches were not defined by measurable dimensions and were considered to be unacceptable if there was any sign of a visual blemish on wire-bondable features. Analysis of the yield at a PCB manufacturer monitored monthly for over two years indicated that the target yield could not be achieved, and the main reasons for yield loss were due to nodules and scratches on the wirebonding pads. The PCB manufacturer attempted to eliminate nodules and scratches. First, a light-scrubbing step was added after electroless copper plating to remove any co-deposited fine particles that acted as a seed for nodules at the time of copper plating. Then, the electrolytic copper plating tank was emptied, fully cleaned, and filtered to eliminate the possibility of co-deposited particles in the electroplating process. Both actions greatly reduced the density of the nodules but did not fully eliminate them. Even though there was only one nodule on any wire-bonding pad, the board was still considered a reject. To reduce scratches on wirebonding pads, the PCB manufacturer utilized foam trays after routing the boards so that they did not make direct contact with other boards. This action significantly reduced the scratches on wire-bonding pads, even though some isolated scratches still appeared from time to time, which caused the boards to be rejected. Even with these significant improvements, the target yield remained unachievable. Another approach was then taken to consider if wire bonding could be successfully performed over nodules and scratches and if there was a dimensional threshold where wire bonding could be successful. A gold ball bonding process called either stand-off-stitch bonding (SSB) or ball-stitch-on-ball bonding (BSOB) was used to determine the effects of nodules and scratches on wire bonds. The dimension of nodules, including height, and the size of scratches, including width, were measured before wire bonding. Wire bonding was then performed directly on various sizes of nodules and scratches on the bonding pad, and the evaluation of wire bonds was conducted using wire pull tests before and after reliability testing. Based on the results of the wire-bonding evaluation, the internal specification for nodules and scratches for wirebondable PCBs was modified to allow nodules and scratches with a certain height and a width limitation compared to initially adopted internal specifications of no nodules and no scratches. Such an approach resulted in improved yield at the PCB manufacturer.
Technical Library | 2022-02-21 19:49:16.0
The ability to undertake non-destructive testing on semiconductor devices, during both their manufacture and their subsequent use in printed circuit boards (PCBs), has become ever more important for checking product quality without compromising productivity. The use of x-ray inspection not only provides a potentially non-destructive test but also allows investigation within optically hidden areas, such as the wire bonding within packages and the quality of post solder reflow of area array devices (e.g. BGAs, CSPs and flip chips).
IPC Vice President David Bergman explains where to find and how to use the Document Revision Table.
Successfully Designing FPGA-Based Systems SMTnet Express March 15, 2012, Subscribers: 25003, Members: Companies: 8826, Users: 32832 Successfully Designing FPGA-Based Systems by: Nagesh Gupta; Cadence Design Systems, Inc. Increases in field
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/march/about-us/news/nordson-march-white-paper-plasma-clean-to-reduce-wire-bond-failures-now-available
. I decline to receive marketing communications from Nordson at this time. * Captcha Back To Top Nordson Electronics Solution is the global leader in advanced plasma treatment technology for the Semiconductor, Printed Circuit Board, Hard Disk Drive, LED, Life Science and
| https://www.smtfactory.com/Introduction-to-the-technical-principles-of-Full-auto-SMT-Production-Line-id3971448.html
. The equipment used is a placement machine, located behind the printing machine in the Full-auto SMT Production Line. Curing: Its function is to melt the patch glue, so that the surface mount components and the PCB are firmly bonded together
