x-ray inspectipn of btcs
TRANSCRIPT
X-Ray Inspection of Bottom Terminated
Components-QFNs, LGAs
Bob Wettermann, MITNovember 2017
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
X-Ray Inspection-BTCs 610 G Criteria
You DO NOT HAVE to x-ray inspect BTCs according to the IPC-A-610G
CHOICEA.Develop process. Validate process using x-ray. Sample plan inspection. Need to have objective
evidenceOR
B. Inspect via x-ray
Note: X-ray equipment not intended for electronic assemblies or not properly set up can damage sensitive assemblies
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
IPC-7093 Inspection Guidelines
x-ray should be used to establish process parameters
x-ray should be used when there is a high proportion of hidden solder joints like on BTCs
x-ray should be used when there are a significant number of untestable solder joints
x-ray should be used when there are numerous fanout vias which are inaccessible or there are mirror BTCs
THESE ARE GUIDELINES (SUGGESTIONS) AND NOT INSPECTION
CRITERIA
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
RECOMMEND – Discussing void criteria with customer else use BGA criteria of max 30% in inspection area
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
Shorts
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
Show Integrity of Bond Wires
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
Solder balls
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
Insuff icient Solder
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
More on Voiding
Your BEST choice in PCB Test/ Rework/Repair and Solder Training & Tools www.solder.net
More on Voiding
X-Ray Inspection of Bottom Terminated
Components-QFNs, LGAs
Bob Wettermann, MITNovember 2017