Douglas,

The pins are not attaching to the pad on the board. I do not think the 
connector is reaching above spec temperatures. It is a lead free 
compatible part, but we are using it in a leaded process. Peak 
temperature is 220C.

Leif Erik Laerum
Quality Assurance Manager
Texas Memory Systems
[log in to unmask]
Tel: (713) 266-3200 x468
www.texmemsys.com



Douglas Erb wrote:
> Leif,
> Are the contacts coming loose from the housing/body or on the board?
> You describe warping and twisting of the connector; what is the
> specified reflow heat capacity of that connector?  It seems to me that
> the temp at the board is exceeding the limits of the connector body
> material.
>
> Doug Erb
> Senior FAE
> Hirose USA
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
> Sent: Friday, May 15, 2009 2:22 PM
> To: [log in to unmask]
> Subject: Re: [TN] Connector with loose pins
>
>  Hi Leif
> You do not say how long that connector is and what the connector body
> material is.
> My guess on very skimpy info is that you have a too long connector made
> with an unsuitable connector body material, with connector pins made of
> some connector pin metal, like BeCu, that while it is a good connector
> pin material with good spring characteristcs, it makes for bad solder
> joints
>
> Werner
>
>
>  
>
>
>  
>
> -----Original Message-----
> From: Leif Erik Laerum <[log in to unmask]>
> To: [log in to unmask]
> Sent: Fri, 15 May 2009 5:16 pm
> Subject: [TN] Connector with loose pins
>
>
>
>
>
>
>
>
>
> Technetters,?
> ?
>
> I have a less scientific question, but I hope someone has some 
> experience with a similar problem.?
> ?
>
> We have a .090 think motherboard where one particular part number 
> connector frequently have loose pins. It is 33 cm by 16mm. There are 
> lots of other types of connectors on the board that does not have 
> issues. We only have problem with one part number. These connectors are 
> at the very front of the board. They go in the oven first. This is a 
> leaded solder board and we use SN63/Pb37 solder. The loose pins tend to 
> be at the end of the connector and on power planes. On some boards it 
> appears that the connector sort of twists or bows a little bit.?
> ?
>
> The problem is that this surface mount connector is very hard to fix. 
> The pins frequently short and due to space limitations, it is hard to 
> reach them with the tip of the soldering iron. They also tend to develop
>
> shorts easy. This makes it even harder to fix after reflow.?
> ?
>
> We have tried reducing the cooling at the end. We have sent the boards 
> through the oven with the mate installed in order to stiffen up the 
> connector. The profile was checked as late as today. Nothing jumped out 
> at me.?
> ?
>
> Does anyone have experience with a similar problem that they managed to 
> solve??
> ?
>
> Thank you.?
> ?
>
>   

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