New Equipment | Solder Paste Stencils
Based on its long work on BGA rework and repair process and its in-house capability to produce metal stencils BEST can provide for you a timely, cost-effective solution for printing on to components for MOST rework systems. Our templates for printing
New Equipment | Solder Paste Stencils
Based on its long work on BGA rework and repair process and its in-house capability to produce metal stencils BEST can provide for you a timely, cost-effective solution for printing on to components for MOST rework systems. Our templates for printin
Electronics Forum | Thu Oct 01 06:18:10 EDT 2009 | rajeshwara
METHOD OF VIA DESIGN AT EXPOSED PAD FOR QFN/QFP.
Electronics Forum | Fri Dec 01 09:29:36 EST 2017 | kojotssss
Hello. We have a problem with QFN type. Component is elevated. Stencils are reduced. Vias is without holes. What are the solutions to fix the fault. Look at the photo. Attachment: https://drive.google.com/open?id=1OIgaXUz2yoKP3fWZg2rUsrmZMBWidk6_
Industry News | 2017-04-24 19:04:48.0
This year, MIRTEC will launch several new inspection machines equipped new cutting-edge technologies. MIRTEC is proud to be promoting these new machines in booth #1J10 at NEPCON China 2017, one of the biggest technical exhibitions of SMT and EMA, from April 25-27 at the Shanghai World EXPO Exhibition & Convention Center. MIRTEC’s new machines have been developed under a concept, ‘Perfect Inspection Solution’. This is an inspection concept involving the combination of 3D, 2D, and side-camera inspection.
Industry News | 2013-07-24 16:39:34.0
IPC — Association Connecting Electronics Industries® announces that IPC APEX India™ will offer a comprehensive program of both half- and full-day workshops designed to help engineers find solutions to their most pressing concerns in electronics manufacturing.
Technical Library | 2019-10-10 00:26:28.0
Voids are a plague to our electronics and must be eliminated! Over the last few years we have studied voiding in solder joints and published three technical papers on methods to "Fill the Void." This paper is part four of this series. The focus of this work is to mitigate voids for via in pad circuit board designs. Via holes in Quad Flat No-Lead (QFN) thermal pads create voiding issues. Gasses can come out of via holes and rise into the solder joint creating voids. Solder can also flow down into the via holes creating gaps in the solder joint. One method of preventing this is via plugging. Via holes can be plugged, capped, or left open. These via plugging options were compared and contrasted to each other with respect to voiding. Another method of minimizing voiding is through solder paste stencil design. Solder paste can be printed around the via holes with gas escape routes. This prevents gasses from via holes from being trapped in the solder joint. Several stencil designs were tested and voiding performance compared and contrasted. In many cases voiding will be reduced only if a combination of mitigation strategies are used. Recommendations for combinations of via hole plugging and stencil design are given. The aim of this paper is to help the reader to "Fill the Void."
Technical Library | 2019-08-07 22:56:45.0
The requirement to reconsider traditional soldering methods is becoming more relevant as the demand for bottom terminated components (QFN/BTC) increases. Thermal pads under said components are designed to enhance the thermal and electrical performance of the component and ultimately allow the component to run more efficiently. Additionally, low voiding is important in decreasing the current path of the circuit to maximize high speed and RF performances. The demand to develop smaller, more reliable, packages has seen voiding requirements decrease below 15 percent and in some instances, below 10 percent.Earlier work has demonstrated the use of micro-fluxed solder preforms as a mechanism to reduce voiding. The current work builds upon these results to focus on developing an engineered approach to void reduction in leadless components (QFN) through increasing understanding of how processing parameters and a use of custom designed micro-fluxed preforms interact. Leveraging the use of a micro-fluxed solder preform in conjunction with low voiding solder paste, stencil design, and application knowhow are critical factors in determining voiding in QFN packages. The study presented seeks to understand the vectors that can contribute to voiding such as PCB pad finish, reflow profile, reflow atmosphere, via configuration, and ultimately solder design.A collaboration between three companies consisting of solder materials supplier, a power semiconductor supplier, and an electronic assembly manufacturer worked together for an in-depth study into the effectiveness of solder preforms at reducing voiding under some of the most prevalent bottom terminated components packages. The effects of factors such as thermal pad size, finish on PCB, preform types, stencil design, reflow profile and atmosphere, have been evaluated using lead-free SAC305 low voiding solder paste and micro-fluxed preforms. Design and manufacturing rules developed from this work will be discussed.
BEST manufactures and designs SMT stencils-both metal and plastic film type. This video demonstrates our metal stencil laser. See more on stencils here: http://www.soldertools.net/categories/Metal-Stencils/
BEST manufactures and designs SMT stencils-both metal and plastic film type. This video demonstrates our metal stencil laser. See more on stencils here: http://www.soldertools.net/categories/Metal-Stencils/
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/dage/application/technical-papers-x-ray-inspection
Real Time X-ray Analysis of Void Formation and Dynamics in QFN Devices During Reflow High powered devices require electrical circuits with good thermal conductance and minimal voiding, to maintain long
