Tombstoning PCB Soldering

Tombstoning -PCB Soldering Problems

A type of open, known by a number of names (including crocodiling, surfboarding, Manhattan effect, drawbridging, Stonehenge effect, billboarding, etc.). This is a soldering defect in which a chip has been pulled into a vertical or near-vertical position with only one side soldered to the PCB. It is typically caused by force imbalances during the reflow soldering process.

 

Process and design-related causes:

 

• Improper pad design

 

• Improper pad trace

 

• Improper solder mask application

 

• Via in pad draining solder from connection

 

• Trace with solder mask over it running under component causing a fulcrum effect on the component

 

Reflow-related causes:

 

• Improper pad design may be aggravated by use of nitrogen. The nitrogen increases surface tension of the metals to the extent that a previously marginal problem becomes distinct.

 

SMT pick and place machine, SMT Mounter, Chip Mounter, JUKI Pick and place Machine, JUKI Chip Shooter, JUKI Chip Placement, JUKI RS-1R pick and place machine, JUKI RX-7R pick and place machine, RX-6R, RX-6B, KE-3020VA, JM-100,  Samsung Pick and Place Machine, Hanwha SM481 Plus Pick and Place Machine, SMT482Plus, SMT 471Plus,Yamaha Pick and Place Machine, Panasonic Pick and Place Machine, FUJI Pick and Place Machine, Siemens Pick and Place Machine.