Hi Robert,
It's when the BGA corners warp upwards during reflow...
Steve
On Thu, May 17, 2018 at 12:00 PM, Robert Kondner <[log in to unmask]>
wrote:
> Hi,
>
> Silly question: What is a solder "Smile"? Crack?
>
> Thanks,
> Bob K.
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of Frank Kimmey
> Sent: Wednesday, May 16, 2018 5:12 PM
> To: [log in to unmask]
> Subject: [TN] Solderjoint elasticity
>
> Can anyone point me in a good direction to learn more about solderjoint
> elasticity with SAC305.
> We are seeing some issues with BGAs when they smile.
> Type 2 fractures and the vendor recommends increasing the solderpaste.
> This seems counter intuitive to me.
> If it was SnPb I would go back and hunt some of Werner's research.
> As it is Lead free I need some direction.
> Any help is appreciated,
> FNK
>
> Frank N Kimmey CID+
> Electrical Engineer/PCB Design
>
> Verifone
> 1400 W Stanford Ranch Road
> Rocklin, CA 95765
> T: 916-625-1818
> M: 916-833-9877
>
> *********************************************************
> This electronic message and any attachments are intended only for the use
> of
> the addressee. The information in this electronic message is confidential
> and proprietary, and may include privileged information. If you are not the
> intended recipient, please delete this electronic message and any
> attachments and notify the sender of the error. Please be aware that any
> unauthorized use, dissemination, distribution or copying of this message or
> any attachments is strictly prohibited.
>
--
Steve Gregory
Kimco Design and Manufacturing
Process Engineer
(208) 322-0500 Ext. -3133
--
This email and any attachments are only
for use by the intended
recipient(s) and may contain legally privileged,
confidential, proprietary
or otherwise private information. Any
unauthorized use, reproduction,
dissemination, distribution or other
disclosure of the contents of this
e-mail or its attachments is strictly
prohibited. If you have received
this email in error, please notify the
sender immediately and delete the
original.
|