Fiducial Mark Design Guidelines
These guidelines are intended
to provide a generic outline for the design and layout
of circuit pattern recognition marks, commonly called
Fiducial Marks. The guidelines adhere to design rules
standardized by the Surface Mount Equipment Manufacturers
Association and are supported by IPC.
Suggestions for layout of "rat-bite"
breakaway tabs
PCBs held together with breakaway tabs to make handling, placement and soldering easier and more efficient.
Boards are snapped apart at the end of processing. (Also look
at V-Scoring)
Causes and Cures of Tombstoning
Chip Components
A tombstone-sometimes called a Manhattan skyline, crocodile,
leaning tower or space rocket-is a chip component that has partially
or completely lifted off one end of the surface of the pad.
The benefits of v-scoring (Pocket Guide to
Excellent V-Scoring)
Since you are a very busy engineer, operator or manager
involved in many other important areas, we offer this concise review
of the fundamentals of v-scoring, that will produce the accurate
and functional product that you desire. By Phil Altomare, Jr. and
Mark Simmons.
About ESD (Everything
You Ever Wanted to Know About Air ionization)
An indepth review of the use of air ionization in ESD
control. By Arnold Steinman.
Matte-surface solder masks reduce solder ball defects.
This article provides a short description of the Influence
of surface liquid photoimageable solder masks on the number of solder
balls remaining on printed circuit boards) processed with no-clean
flux).
| The information contained
in these Technical Bulletins is based on data considered accurate.
No warranty is expressed or implied regarding the accuracy of
this data. Liability is expressly disclaimed for any any loss
or injury arising out of this information or use of any materials
designated. |
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