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Crystall on a PCB brakes under vibration

Crystall on a PCB brakes under vibration

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Hello all, I have a crystal that breaks in spinning test ... - Nov 28, 2018 by Evtimov

I think silicone mask is ok, This is so that after soldering... - Nov 29, 2018 by Cannizzaro

is it vibration or pcb bends under G force? what angle is th... - Nov 29, 2018 by bukas

You may want to look at a product called place & bond underf... - Nov 29, 2018 by Robl

Robl, I like this underfilm. Do you think you should plac... - Nov 29, 2018 by Evtimov

Hi Evtimov, For BGA's you place 4 on each side right outs... - Nov 29, 2018 by Robl

Thanks Rob, in my case I will probably have it in the mid... - Nov 29, 2018 by Evtimov

Thanks,@Robl for sharing. ... - Jan 08, 2019 by Mermar

Hi Mermar, you're welcome. ... - Jan 08, 2019 by Robl

Evtimov

#81507

Crystal on a PCB brakes under vibration | 28 November, 2018

Hello all,

I have a crystal that breaks in spinning test with several G. I need to secure this part and I am wondering what kind of solution you might have. I was thinking some silicone coating that can be dispensed.Or do you think an underfill might solve this issue? The PCB is a high runner, so I would need fast process. Regards, Emil

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Cannizzaro

#81509

Crystal on a PCB brakes under vibration | 29 November, 2018

I think silicone mask is ok, This is so that after soldering, you can use these holes to fit other components later. This peelable layer is needed, unless you want to solder each component manually--From ALLPCB

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bukas

#81511

Crystal on a PCB brakes under vibration | 29 November, 2018

is it vibration or pcb bends under G force? what angle is this force?

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Robl

#81512

Crystal on a PCB brakes under vibration | 29 November, 2018

You may want to look at a product called place & bond underfilm. It is essentially a SMD tape and reel placed pad that acts like underfill when going through reflow. I got some samples from an APP tech day and had a play and it bonds very well.

You place the pad (or pads) first, then the component on top.

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Evtimov

#81521

Crystal on a PCB brakes under vibration | 29 November, 2018

Robl,

I like this underfilm. Do you think you should place it in the middle of the part? I am curious if they provided some advice to you as how to use it.

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Robl

#81523

Crystal on a PCB brakes under vibration | 29 November, 2018

Hi Evtimov,

For BGA's you place 4 on each side right outside the edge balls and it pulls the case down and a bit is pulled between the balls on reflow.

Not tried gluing a crystal (they only gave me a strip to play with)

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Evtimov

#81524

Crystal on a PCB brakes under vibration | 29 November, 2018

Thanks Rob,

in my case I will probably have it in the middle under the part and see if it really helps with the vibration. My other option is to use underfill and see how that works...just not sure how good it will flow under as the part is close to the PCB

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Mermar

#81704

Crystal on a PCB brakes under vibration | 8 January, 2019

Thanks,@Robl for sharing.

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Robl

#81707

Crystal on a PCB brakes under vibration | 8 January, 2019

Hi Mermar, you're welcome.

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