> OK Genny,
> seems to me as a ordinary 12V 4pole supply connector or like. Why bother. 
> They are soldered by a million every day, and seemingly they work. Forget 
> the 5aMSL, the manufacturer's way to point on the possibility that they 
> COULD absorb water vapor, but everything can do that. If you do the right 
> thing you will manage those conns as well as all other hundreds of 
> assembly lines around. As someone said, if too much humidity comes in, 
> they'll pop, but you don''t know until tested.
>
>
> Nylon ropes are a product of World War II, developed when the United 
> States assembled an army alpine division. Starting from scratch, the U.S. 
> developed a number of new products for those troops: nylon rope was one of 
> them.
>
> Nylon ropes have a much greater strength than hemp ropes, are easier to 
> handle, maintain strength when wet, don't rot, and can be manufactured to 
> have specific desirable characteristics. While nylon ropes can be cut if 
> run over a sharp edge and will deteriorate in sunlight, all in all they're 
> a major improvement over hemp ropes.
>
>
> - Demetri Kolokotronis
>
> So, the women have american alpinists to thank for the nylons?
>
> Inge
>
> ----- Original Message ----- 
> From: "Genny Gibbard" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, May 13, 2009 10:23 PM
> Subject: Re: [TN] Nylon connectors - moisture sensitivity
>
>
> This is a shrouded header, 2mm spacing on the pins.  Basic.  Nothing high 
> frequency.
> It is surface mount, it is designed for reflow.  This one is specified 
> that it can withstand one reflow of 260C for 10 seconds.
> When this connector arrived, it was in MBB packaging.
> When we asked about that, we were told, 'treat it as equivalent to 5a 
> MSL'. This is the first time I have ever heard of a basic connector being 
> MSL.
> We received it on tape and reel.
> However, we were told that if it is out of MBB for longer than 24 hours 
> that we should bake at 120C for 4 hours.
> We will have to take it out of T&R to do that, which means it would need 
> to be repackaged.
>
> I should clarify - when I talked about melting connectors I was talking in 
> general terms, not this specific connector.  I'm sure we've all melted a 
> connector from time to time.
> I was trying to understand what would happen, what kind of damage would we 
> see, if it was moisture-laden and we reflowed it anyway?
>
> Genny
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
> Sent: May 13, 2009 1:22 PM
> To: [log in to unmask]
> Subject: Re: [TN] Nylon connectors - moisture sensitivity
>
> Genny,
> first of all, you should ask yourself :
> - what is the system impedance (50 Ohm or MOhms)
> - signal levels
> - current levels
> - DC?
> - AC?
> - data lines?
> - wave form?
> - S/N requirements?¨
> - Insulation requirements (flashover risk)
> - pin/sleeve basic metal?
> - ditto plating?
> - migration condtions?
> - nylon reinforcement?
>
> Then you can judge the situation and decide what level of risk.
> In certain situations not even Teflon is satisfactory.
>
> Inge
>
> ----- Original Message -----
> From: "Genny Gibbard" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, May 13, 2009 8:43 PM
> Subject: [TN] Nylon connectors - moisture sensitivity
>
>
> We have been told that a surface mount nylon connector we use is
> moisture sensitive, and should be treated as equivalent to level 5a.
> This is the highest level we have ever seen on any component we have
> used of any type.  I didn't think that a connector could be moisture
> sensitive.  Not heat tolerant, yes - we have melted a few - but moisture
> sensitive?
> What kind of damage can happen to a nylon connector from too much
> moisture absorption?
> Thanks in advance for your responses.
>
> Genny
>
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