Maybe I should just ask digikey, which is my supplier in this case. > On Aug 20, 2019, at 2:13 AM, johnk <[email protected]> wrote: > > When "we" were manufacturing in the '90s the safe storage time for SMD was > around 3 to 6 mths. Surfaces weren't 'fresh' after that. Some was wave > soldered some reflow. > If that is a slow moving component then maybe they coated it with a > solder-thru protective layer? Doesn't seem like they used a low activity flux > coating from that description. > We had reasonable success with the solder-through enamelled copper wire > coatings, but generally still had someone on the production line dip the ends > of the coil/transformer leads in a solder pot. One of the main reasons iirc > was that we had difficulty transitioning the inspectors from through-hole > soldering to SMT. Historical note: I believe that NASA demonstrated that > certain bad-looking joints were actually equal/superior to the ones that > inspectors were trained for. It was TOO hard to characterise the iffy looking > joints so that they could be reliably distinguished from bad joints. When SMT > came along various inspectors nearly had breakdowns :-) > > [I have no idea of current practices; and gee, THAT was 25 years ago! Feels > like yesterday.] > Hope you find out about that coating as I am rather interested too. > > John K > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Paul Andrews > Sent: Tuesday, 20 August 2019 13:24 > To: [email protected] > Subject: Re: [neonixie-l] Q: Gold colored coating on surface mount contacts > > No. Still don’t know what it is. > >> On Aug 19, 2019, at 11:01 PM, Bill Notfaded <[email protected]> wrote: >> >> Did you figure it out Paul? Now you have me wondering too... >> >> Bill >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "neonixie-l" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/neonixie-l/qYuTkMwIVV4/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/015e1826-1302-4a5f-adca-ca706946fdf2%40googlegroups.com. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/91C8E9B0-180E-4BAB-8F43-156BD34F86AA%40gmail.com. > > -- > You received this message because you are subscribed to a topic in the Google > Groups "neonixie-l" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/neonixie-l/qYuTkMwIVV4/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/001b01d5571e%2459808d10%240c81a730%24%40internode.on.net.
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