Author Topic: What type of solder is used on circuit boards for space probes?  (Read 1796 times)

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Online xrunner

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That's my question for today. Thank you.
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Offline NiHaoMike

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Re: What type of solder is used on circuit boards for space probes?
« Reply #1 on: August 05, 2016, 02:12:54 am »
Most likely some very high grade leaded silver solder. Space hardware generally uses tried and true processes and materials since reliability is top priority.
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Offline CatalinaWOW

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Re: What type of solder is used on circuit boards for space probes?
« Reply #2 on: August 05, 2016, 05:22:32 am »
The OP in this thread listed below links a NASA paper related to this subject.  Generally NASA requires something like 2-3% lead in the solder.  The paper describes why.  I believe the other space agencies have similar policies.

https://www.eevblog.com/forum/projects/whiskers-on-components-worth-a-read/msg996258/#msg996258
 
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Offline ConKbot

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Re: What type of solder is used on circuit boards for space probes?
« Reply #3 on: August 05, 2016, 06:03:07 pm »
From nasa-std-8739.3
 
6.11 Solder
6.11.1 Types and Usage. All solder used for tinning and solder connections shall conform to
ANSI/J-STD-006 (Requirement). Flux-cored solder shall be either composition SN60 or SN63
containing flux types R or RMA, or equivalent (Requirement). For all soldering applications
where adequate subsequent cleaning is not practical, only solder containing flux type R shall be
used (Requirement). Solid solders (no flux) for use in solder pots shall be of the same
composition (Requirement).
 

Offline Stray Electron

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Re: What type of solder is used on circuit boards for space probes?
« Reply #4 on: August 05, 2016, 10:42:09 pm »
   I don't know what they're using now but about 5 years ago they HAD been using lead-free ROHS solder and they lost a LOT of satellites due to that stuff.  I live with a few miles of KSC and a friend of mine had a job removing the lead free solder and re-soldering the circuit boards with leaded solder.  I don't know what alloy though.
 

Online xrunner

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Re: What type of solder is used on circuit boards for space probes?
« Reply #5 on: August 05, 2016, 11:10:53 pm »
Thanks for the answers.  :)
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Offline German_EE

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Re: What type of solder is used on circuit boards for space probes?
« Reply #6 on: August 06, 2016, 08:10:59 pm »
I was at a place on Thursday that made space qualified parts and they used leaded solder.
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