Technical Library | 2023-07-25 16:25:56.0
This paper address two significant applications of stencils in advance packaging field: 1. Ultra-Thin stencils for miniature component (0201m) assembly; 2. Deep Cavity stencils for embedded (open cavity) packaging. As the world of electronics continues to evolve with focus on smaller, lighter, faster, and feature-enhanced high- performing electronic products, so are the requirement for complex stencils to assemble such components. These stencil thicknesses start from less than 25um with apertures as small as 60um (or less). Step stencils are used when varying stencil thicknesses are required to print into cavities or on elevated surfaces or to provide relief for certain features on a board. In the early days of SMT assembly, step stencils were used to reduce the stencil thickness for 25 mil pitch leaded device apertures. Thick metal stencils that have both relief-etch pockets and reservoir step pockets are very useful for paste reservoir printing. Electroform Step-Up Stencils for ceramic BGA's and RF Shields are a good solution to achieve additional solder paste height on the pads of these components as well as providing exceptional paste transfer for smaller components like uBGAs and 0201s. As the components are getting smaller, for example 0201m, or as the available real estate for component placement on a board is getting smaller – finer is the aperture size and the pitch on the stencils. Aggressive distances from step wall to aperture are also required. Ultra-thin stencils with thicknesses in the order of 15um-40um with steps of 15um are used to obtain desired print volumes. Stencils with thickness to this order can be potential tools even to print for RDLs in the package.
Industry News | 2013-09-30 18:14:34.0
Free Session, Spotlight 4, October 16, 2013 from 9:30-11:00 AM
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.
Industry News | 2016-02-10 17:03:46.0
MET Stencil announces the launch of the NanoSlic® Gold stencil. NanoSlic® is the world's most advanced stencil coating technology for improving solder paste printing. "We are pleased to announce that we have been licensed by FCT Assembly to sell this coating to the US market.” said Fred Cox, President of MET Stencil. "Stencil users will immediately see the benefits in their print."
Industry News | 2014-02-18 17:14:55.0
FCT Assembly will debut the new NanoSlic® Gold stencil in Booth #2175 at the IPC APEX EXPO, scheduled to take place March 25-27, 2014 at the Mandalay Bay Resort & Convention Center in Las Vegas, Nevada.
Industry News | 2014-08-25 16:35:50.0
FCT Assembly will exhibit in Booth #221 at SMTA International, scheduled to take place Sep. 30 - Oct. 1, 2014 at the Donald Stephens Convention Center in Rosemont, IL.
Industry News | 2014-09-04 23:32:50.0
Indium Corporation's Wolfgang Bloching, regional sales manager for Germany, Austria, and Switzerland, will present at Yamaha Technology Day on Oct. 1 in Neuss, Germany.
Industry News | 2015-11-18 18:11:05.0
Speedline Technologies’ new MPM Edison printer has taken a coveted Global Technology Award. The award was presented to Speedline Technologies’ Mark Clemons, Business Unit Manager – Printers, during a ceremony on Tuesday, Nov. 10, 2015 that took place at the Messe München exhibition center in Munich, Germany during Productronica.
Industry News | 2016-03-31 14:19:36.0
Speedline MPMs' new Edison printer received the 2016 New Product Introduction (NPI) award in the stencil/screen printing equipment category. Announced by Circuits Assembly at the recent IPC APEX® trade event in Las Vegas, winners were recognized for leading new products in electronics assembly equipment, materials and software.
Industry News | 2014-01-22 11:00:42.0
FCT Assembly announces the launch of the NanoSlic® Gold stencil. NanoSlic® is the world’s most advanced stencil technology for solder paste printing.
