Ioan,
Do you have a chain transport or a belt conveyor. If the connector is
too close to the chain with a high thermal mass and/or there is less
turbulance in that region, the wetting temperature may not be reached.
Did you check the delta T over the width of the oven?
Peer Langeveld
> Consultant Soft Soldering Processes
> 5502 VH 8 The Netherlands
2007/10/26, Tempea, Ioan <[log in to unmask]>:
> Thanks Peer,
>
> so it's not the plating 8-{
>
> Have to play a little bit more with the reflow, forgotten to mention the connector is SMT.
>
> Regards,
>
> Ioan
>
> -----Original Message-----
> From: P. Langeveld [mailto:[log in to unmask]]
> Sent: Friday, October 26, 2007 10:48 AM
> To: TechNet E-Mail Forum; Tempea, Ioan
> Subject: Re: [TN] Component pins plating thickness
>
>
> Ioan,
>
> The answer is 2-fold:
>
> 1. The measured finish layers are OK. The manufacturers spec however
> are, too lean. Already in the lead age the Ni-layer should be 0.002
> mm (80 microin), the minimum Sn thickness 0.005 mm (200 microin).
> Otherwise the risk of the Sn layer is not hermetic sealing the Ni
> layer and the latter can be oxidized. And give wetting problems, and
> even more in PTH's.
>
> 2. I presume the connector is wave soldered at say, 265 dC.
> The (matte) tin has a melting point of 231 dC. Added with the thermal
> mass of the internal metal contact lips and other internal heat sinks
> in the board, the (total) contact time on the wave(s) has to be
> increased with about 1 second.
>
> Success.
>
> Peer Langeveld
> Consultant Soft Soldering Processes
> 5502 VH 8 The Netherlands
>
> 2007/10/26, Tempea, Ioan <[log in to unmask]>:
> > Hi Technos,
> >
> > I'm having a tough connector here, hard time to get all the pins soldered.
> >
> > It is matte Sn over Ni finished, measured coating thicknesses are 250 microinch Sn over 80 microinch Ni. Are these values OK? Isn't the Ni too thin and the Sn too thick?
> >
> > The manufacturer spec is 0.001mm (40 microin) minimum Sn over 0.0013 (51 microin) minimum Ni.
> >
> > Thanks for your input,
> >
> > Ioan
> >
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