Mr Hui,

Off the top of my head, I can think you should check the following things:
 - Verify your thermal profile
 - Check solderability of the leads ( wetting force)
 - Do you any component with large thermal mass nearby?
 - Have you experienced severe board warp on the assembly?
 - Check the footprint of the component.
 - Is there any via beneath the component
 - Check solderability of the pads.

Please let me know the outcome of your investigation !!

Hope this helps

Thanks
Michael Yuen : )
[log in to unmask]
 ----------
From: TechNet-request
To: Technet
Subject: RE: Assy: Tombstoning of SOT23
Date: Friday, July 12, 1996 7:38PM

Hi Technet,

Has anybody ever encountered tombstoning on the SOT-23 component. I
understand it is normal to see chip component tombstoning, but not SOT-23.

I hope somebody could enlighten me what is/are the causes.

Thanks in Advance..

Poh Kong Hui
Nera Electronics


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