Industry Directory | Consultant / Service Provider / Manufacturer
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New Equipment | Solder Paste Stencils
Eliminate hours of solder mask damage repair time for bga sites while improving rework yield. Are you frustrated by the time it takes to repair mask damage underneath the BGA during the rework process? Are you squeezed for space on the PCB in an
New Equipment | Fabrication Services
Quantity: 5pcs Lead Time: 7 working days Number of layers: 2 layers Max board dimensions: 6300x3900mils/160x100mm Material: R-4, Tg130 Finished Thickness: 63mil/1.6mm Min Trace/space: 6mil/0.15 Min.Holes size: 12mil/0.3mm Copp
Electronics Forum | Fri Jan 03 12:01:46 EST 2003 | jax
Alot of the companies out there use Standards developed internally, centered around there paste, equipment, and reflow processes. Normally you will see either 5mil or 6mil stencils used for everything in house with the exceptions of specific boards.(
Electronics Forum | Thu Jan 09 10:47:36 EST 2003 | Hussman
Depends on what you mean by shifting towards each other. Otherwise, 7 mil should be fine for 0603. I've used 6mil, 7mil and 8 mil without problems. Generally, stencil thickness won't have a bearing on "shifting" parts. Check placement. Make su
Used SMT Equipment | Pick and Place/Feeders
SMT Line Equipment Package For Sale consisting of the following items DEK 265 GSX Stencil Printer - Year 1999 Universal 4796L ChipShooter - Year 2000-2001 305+ Universal HSP Feeders of various sizes 16+ Universal HSP Feeder Carts Universal GSM2 - Du
Used SMT Equipment | Pick and Place/Feeders
Product Details: Universal GSM2 machine with PTF Product Code: 4688A Vintage: 1999 Power: 230 V 30 Amps 50/60 Hz 3 Phase Air required: 90 PSI 6CFM 175.5 L 6.2 bars Operating system/Software: OS2 Head: Flexhead on both beams Camera type: Standard
Industry News | 2018-12-08 03:29:29.0
SMT Dictionary – Surface Mount Technology Acronym and Abbreviation
Industry News | 2014-01-17 12:52:25.0
BEST Inc., has developed a line of Kapton™ SMT stencils for the prototype assembly market. These stencils, available in 4,5 and 6 thicknesses, present very flat coplanar printing surfaces for solder paste printing. . They are designed to be used when the there are very few boards to be made at one time and the pitch of the components is 1.00 and above.
Parts & Supplies | Other Equipment
AI universal parts 40727505 46737003 SCRAP HOUSING ASSY, OFFSET 46737103 SCRAP HOUSING ASSY, "T" STYLE 46750601 COVER, CLINCH OFF 46750901 COVER, CLINCH VSL 46757801 PICKER AXIS MTR ASSY 46757901 X AXIS MTR ASSY 46758001 Y AXIS MTR ASSY 467
Parts & Supplies | Chipshooters / Chip Mounters
AI universal parts 30997607 46737003 SCRAP HOUSING ASSY, OFFSET 46737103 SCRAP HOUSING ASSY, "T" STYLE 46750601 COVER, CLINCH OFF 46750901 COVER, CLINCH VSL 46757801 PICKER AXIS MTR ASSY 46757901 X AXIS MTR ASSY 46758001 Y AXIS MTR ASSY 46
Technical Library | 2023-07-25 16:50:02.0
Some of the new handheld communication devices offer real challenges to the paste printing process. Normally, there are very small devices like 01005 chip components as well as 0.3 mm pitch uBGA along with other devices that require higher deposits of solder paste. Surface mount connectors or RF shields with coplanarity issues fall into this category. Aperture sizes for the small devices require a stencil thickness in the 50 to 75 um (2-3 mils) range for effective paste transfer whereas the RF shield and SMT connector would like at least 150 um (6 mils) paste height. Spacing is too small to use normal step stencils. This paper will explore a different type of step stencil for this application; a "Two-Print Stencil Process" step stencil. Here is a brief description of a "Two-Print Stencil Process". A 50 to 75 um (2-3 mils) stencil is used to print solder paste for the 01005, 0.3 mm pitch uBGA and other fine pitch components. While this paste is still wet a second in-line stencil printer is used to print all other components using a second thicker stencil. This second stencil has relief pockets on the contact side of the stencil any paste was printed with the first stencil. Design guidelines for minimum keep-out distances between the relief step, the fine pitch apertures, and the RF Shields apertures as well relief pocket height clearance of the paste printed by the first print stencil will be provided.
Technical Library | 2023-07-25 16:42:54.0
Printing solder paste for very small components like .3mm pitch CSP's and 01005 Chip Components is a challenge for the printing process when other larger components like RF shields, SMT Connectors, and large chip or resistor components are also present on the PCB. The smaller components require a stencil thickness typically of 3 mils (75u) to keep the Area Ratio greater than .55 for good paste transfer efficiency. The larger components require either more solder paste height or volume, thus a stencil thickness in the range of 4 to 5 mils (100 to 125u). This paper will explore two stencil solutions to solve this dilemma. The first is a "Two Print Stencil" option where the small component apertures are printed with a thin stencil and the larger components with a thicker stencil with relief pockets for the first print. Successful prints with Keep-Outs as small as 15 mils (400u) will be demonstrated. The second solution is a stencil technology that will provide good paste transfer efficiency for Area Ratio's below .5. In this case a thicker stencil can be utilized to print all components. Paste transfer results for several different stencil types including Laser-Cut Fine Grain stainless steel, Laser-Cut stainless steel with and w/o PTFE Teflon coating, AMTX E-FAB with and w/o PTFE coating for Area Ratios ranging from .4 up to .69.
StencilQuik demonstration video. This breakthrough method allows you to simplify placement/replacement saving 50% or more of time required to rework BGAs or CSPs.This is a well developed BGA rework method. More on the StencilQuik(TM) process here:
SMT Express, Volume 2, Issue No. 3 - from SMTnet.com Volume 2, Issue No. 3 Thursday, March 16, 2000 Featured Article Return to Front Page Stencil Design for Mixed Technology Through-hole / SMT Placement and Reflow by William E. Coleman, Photo
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154_post11220.html
causing solder protrusion. 2. When the solder goes into the vias, it robs the thermal pad from having the optimal solder joint. Less solder = bad connection. 3. The thinner PCB thickness of 1 mm can be problematic because it's easier for the solder to flow out the bottom side and could cause shorting
