reflowsystems.com manufactures and distributes three series of ovens to offer a perfect fit in size and price for every production need: 1) CORA 450 and 250 are combining not only COnvection and RAdiation to guarantee stressfree soldering of BGAs eve
Electronics Forum | Tue Feb 08 16:09:09 EST 2000 | dean
Generally speaking with most electronic grade epoxies: 1. Cure time is a function of temperature. 2. Polymer bonds begin to quickly break down above certain temperatures (product specific). I believe aprox 170-180C. The strength of the bond de
Electronics Forum | Mon Apr 19 20:49:13 EDT 1999 | Dave F
| Netters, | | When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? | | 1. Kester 293 no clean | 2. 2.1 C/s for 30s to 150 C | 3. .5 - .7 C/s for 60s to 185
Industry News | 2018-10-18 08:00:40.0
SMT solder joint quality and appearance inspection process
Industry News | 2018-10-18 08:01:00.0
SMT solder joint quality and appearance inspection process
Technical Library | 2024-07-24 01:04:35.0
Quad Flat No Leads (QFN) package designs receive more and more attention in electronic industry recently. This package offers a number of benefits including (1) small size, such as a near die size footprint, thin profile, and light weight; (2) easy PCB trace routing due to the use of perimeter I/O pads; (3) reduced lead inductance; and (4) good thermal and electrical performance due to the adoption of exposed copper die-pad technology. These features make the QFN an ideal choice for many new applications where size, weight, electrical, and thermal properties are important. However, adoption of QFN often runs into voiding issue at SMT assembly. Upon reflow, outgassing of solder paste flux at the large thermal pad has difficulty escaping and inevitably results in voiding. It is well known that the presence of voids will affect the mechanical properties of joints and deteriorate the strength, ductility, creep, and fatigue life. In addition, voids could also produce spot overheating, lessening the reliability of the joints.
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IPC Tech Ed Webinar Series: Ball Grid Array (BGA) and Bottom Termination Component (BTC) Design and Assembly Challenges: Reflow Profiling to Achieve Low Defect Rates and Successful Assembly! – Part 2
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Hi, I have 8 years experience in electronics manufacturing company. I have good knowledge in SMT process and equipment maintenance.i successfully completed more than 200 NPI's. I have good knowledge in SMT machine programming and maintenance
the high reflow temperatures of SAC or relies on OD
SMT Express, Volume 2, Issue No. 9 - from SMTnet.com Volume 2, Issue No. 9 Thursday, September 14, 2000 Featured Article Return to Front Page Reflow Profiling The Benefits of Implementing a Ramp-to-Spike Profile by David Suraski /AIM
| http://etasmt.com/cc?ID=te_news_industry,24565&url=_print
. So, you must analyze your target board first before creating a unique reflow profile. Make an virtual reflow profile. A virtual reflow profile is based upon soldering theory, the recommended solder profile from the solder paste manufacturer, size, thickness, cooper weight, layers of the board and size, and the
Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2022/04/Vacuum-Void-Reduction-Reflow-1.pdf
. Various process techniques have been employed to reduce voiding including reflow profile modifications, nitrogen atmosphere reflow, and implementation of special solder paste formulations and stencil designs [17
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