Re: [neonixie-l] Q: Gold colored coating on surface mount contacts

2019-08-20 Thread Paul Andrews 
Maybe I should just ask digikey, which is my supplier in this case.

> On Aug 20, 2019, at 2:13 AM, johnk  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: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
> Behalf Of Paul Andrews
> Sent: Tuesday, 20 August 2019 13:24
> To: neonixie-l@googlegroups.com
> 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  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 
>> neonixie-l+unsubscr...@googlegroups.com.
>> 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 neonixie-l+unsubscr...@googlegroups.com.
> 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 
> neonixie-l+unsubscr...@googlegroups.com.
> To view this discussion on the web, visit 
> https://groups.google.com/d/msgid/neonixie-l/001b01d5571e%2459808d10%240c81a730%24%40internode.on.net.

-- 
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 neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/60BC4AD0-32A1-464D-8941-AC6088658129%40gmail.com.

RE: [neonixie-l] Q: Gold colored coating on surface mount contacts

2019-08-20 Thread johnk 
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: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
Behalf Of Paul Andrews
Sent: Tuesday, 20 August 2019 13:24
To: neonixie-l@googlegroups.com
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  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 
> neonixie-l+unsubscr...@googlegroups.com.
> 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 neonixie-l+unsubscr...@googlegroups.com.
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 the Google Groups 
"neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/001b01d5571e%2459808d10%240c81a730%24%40internode.on.net.

Re: [neonixie-l] Q: Gold colored coating on surface mount contacts

2019-08-19 Thread Paul Andrews 
No. Still don’t know what it is.

> On Aug 19, 2019, at 11:01 PM, Bill Notfaded  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 
> neonixie-l+unsubscr...@googlegroups.com.
> 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 neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/91C8E9B0-180E-4BAB-8F43-156BD34F86AA%40gmail.com.

[neonixie-l] Q: Gold colored coating on surface mount contacts

2019-08-19 Thread Bill Notfaded 
Did you figure it out Paul?  Now you have me wondering too...

Bill

-- 
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 neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/015e1826-1302-4a5f-adca-ca706946fdf2%40googlegroups.com.

[neonixie-l] Q: Gold colored coating on surface mount contacts

2019-08-17 Thread Paul Andrews 

What is the gold/amber colored coating on the contacts of this chip? The 
contacts aren't gold, and when it is reflowed it just bubbles up as gunk.



-- 
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 neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/77043ffc-71cc-420a-80b1-dab398f93990%40googlegroups.com.