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Reflow problem resonator

Joris Groot Koerkamp

#34573

Reflow problem resonator | 27 May, 2005

I have a problem with a Murata cap chip type resonator(ROHS). After the reflow process, the soldering joints flow to one side of the component. I did not have this problem with the leaded component. Did someone have a solution for this problem?

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Rob

#34579

Reflow problem resonator | 27 May, 2005

Hi Joris,

Which package type is it?

1) Melf/quadra melf (CSA) 2) Can type (CSTCC/CSTCR/AVX PBRC) 3) Chip type 3 pad (CSTCE) 4) Chip Type 4 pad (CSTCW)

Cheers,

Rob.

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Joris Groot Koerkamp

#34582

Reflow problem resonator | 27 May, 2005

Hi Rob,

The packagetype is: 2) CSTCC

KR

Joris

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Rob

#34585

Reflow problem resonator | 27 May, 2005

Hi Joris,

I've used 10's of Millions of these (and the AVX version - PBRC****) and never found this problem (I also worked for Murata back in the mists of time & never encountered it).

Internally the part is thermally symmetrical, so the only thing I can imagine if it was component related is for half of the terminations to be contaminated causing the solder to flow elsewhere - however it is quite a small device & this would be very hard to achieve.

My guess would be this is a layout issue - with solder flowing either towards a via or hotter area of the board (large copper area etc.).

Is this the first time that you have placed this component instead of using the through hole part?

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Joris Groot Koerkamp

#34629

Reflow problem resonator | 30 May, 2005

Hi rob,

We use the component for a long time and never had a problem with the reflow process. Since the component is Leadfree we see the problems. We have the same problem with defferent pcb's. The tin not always flows to the same direction. I checked the layout and it's the same as they specified.

Kind regards,

Joris

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Rob

#34637

Reflow problem resonator | 31 May, 2005

Do all of your PCBs come from the same supplier & are they HASL?

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Joris Groot Koerkamp

#34638

Reflow problem resonator | 31 May, 2005

Hi Rob,

Yes all PCBs come frome the same supplier and are HASL.

KR Joris

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Rob

#34639

Reflow problem resonator | 31 May, 2005

Hi Joris,

What is the surface finish like - is it pooled to one side of the pad?

Cheers,

Rob.

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Joris Groot koerkamp

#34640

Reflow problem resonator | 31 May, 2005

No it looks very good. We have not had any problems with our HASL pcbs.

KR.

Joris

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