Quad Flat No Leads (QFN) package designs receive more and more attention in electronic industry nowadays. This package offers a number of benefits including (1) small size, such as a near die-sized footprint, thin profile, and light weight; (2) easy PCB trace routing due to the use of perimeter I/O pads; (3) reduced lead inductance; (4) easy PCB trace routing; and (5) 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 issues at SMT assembly. Upon reflow, outgassing of solder paste flux at the large thermal pad has difficulty escaping and inevitably results in voiding.
The BEST Pad Repair kit includes the tools and materials needed to reliably replace lifted or damaged surface mount and BGA pads on PCB's.
This kit includes 3 different tin plated copper base material circuit frame patterns, which offer nearly 3 times as many useable replacement land patterns as other circuit frames. Unlike dry film circuit frames, BEST circuit frames have no shelf life and can be used on both lead-free and tin-lead finish circuit boards.
SMT Line Production Rate -
Has anyone managed to accurately produce a spreadsheet or formula that will accurately calculate the amount of boards your SMT line will produce an hour?...
Solder beading with PCB from different fab -
We recently decided to try using a different source for our bare boards to save money. On two different batches of PCBs now from the new source, we are seeing beading...
This course will provide the students with an inspection process to physically review the product to determine the whether or not it meets the customer quality requirements....
Trade Show/Exhibition, Conference | Sun, April 10, 2011 - Thu, April 14 | Sponsored by: IPC
Join thousands of colleagues from more than 50 countries at our industry's premier event � featuring advanced and emerging technologies in printed board design and manufacturing, electronics assembly and test...
SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies. Membership Info | SMTA Certification | Bookstore
IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly. Membership Info | Training & Certification Programs | Standards & Publications - Online Store