Thanks a lot for the offer, but I need parts that appear on the NASA parts list. I am builing an USOs that is supposed to be space qualified, so a lot of parts are not even allowed. So for the types, that are 2N2222, 2N2857, 2N2848, 2N3866, ...
really retro, I know. Other parts may be even better, but you know the space buerocrats.
Is it possible, that you could post this parts list here? Just out of curiousity.
Thanks.
Yeah, why not. The link is here:
https://nepp.nasa.gov/npsl/
It also has links to the European and Japanese Space Agency Lists. Dont be surprised that some parts are older than you
Who still manufactures those devices to those Mil-Spec standards...? To get that rating is more than just final parts testing; it's a whole process, from beginning to end that has to be maintained in closed-loop management to ensure the part is sufficiently abuse-tolerant.
After that, there's a whole nuther long involved process in the procurement aspect; from storage conditions to static-protection to chain-of-custody at every step of the part's handling to ensure it ARRIVES to the assembler without degradation. The last one left that I knew of back in the day was Fairchild; to my knowledge they no longer have US-based production facilities so would not qualify from the security aspect of that process control...?
mnem
*just me fulminating at the mind again...*
I think one of the major MIL parts supplier today is Microsemi.
And, yes, for class 1 you need backtrackability from the part back to the wafer. including all processing steps, tests, ...
No wonder a 2N2222A with all the checks will cost you about 1K per piece. You get a telephone book of documentation with it,
and you have to wait a few months before you get it. And - most surprising - the data of these parts is not as good as standard parts.
Only the have proven that they can survive a lot more abuse than others. Thats what you want in a space environment. Reliability is king.
Cutting edge ? Nah. Never.
Also Crystalonics, TT Group, Central Semiconductor, Lansdale, Teledyne E2v, American Microsemiconductor, Aeroflex, Austin Semiconductors, GE Aviation Systems Semiconductor Products, Semelab, Semicoa, Semtech, Sensitron, Solitron Devices, Semtex Industrial, Semiconductor Technology Inc., Silicon Transistor Corporation (STCsemi), Omnirel.
The area has been taken up mainly by smaller companies, as the reduced military volumes coincide with other influences like the agressive TI 'plastic-Mil' program. Also, some other sources are not semiconductor manufacturers per se, but former Distributors, which commission the parts and split the work between the manufacturer and a specialized test house. You can get parts from Linear Systems, Diodes Inc., Calogic, Cissoid that way or the parts are made by pure fabs without own portfolio which hold the necessary qualifications. As mentioned, some of the burden has been taken over by test houses, especially where Rad-Hard parts are concerned.
The QPDs (Qualified Products Databases) which are on
https://qpldocs.dla.mil but also linked where the QPLs formerly were on ASSIST are always a good source for components, because you get an idea who is basically qualified and can be asked to take something up. For that, I prefer the older, last QPL that was issued, because you get at the manufacturers names without making multiple queries. The open access on ASSIST Quicksearch should be sufficient for most purposes.
Here you get at all parts that are covered by SMDs (Standard Microcircuit Drawings):
https://landandmaritimeapps.dla.mil/Programs/MilSpec(Don't be put off by the name - they do space qualified part too)
Also the /Resources on that site has good cross references.
Also here:
https://www.doeeet.comSometimes it is not so easy. For example take the US Naval Sea Systems Command, which is a giant organisation ....with a shiny website devoid of interesting content. it is not until you know that the work is done in their so-called warfare centers and you know which one, that you know where to go. For example, the Aegis system is handled by the Naval Surface Warfare Center Port Port Hueneme, and it is not before you go there AND then descend into the departmental structure that you find anythind meaningful. USAF is even worse - their AMC is simply byzantine. If you ever know what is the real name of a activity, do not lose this knowledge so that you can find it even if the structures above it change.
It also helps to have some contacts to specialized distributors like MSA Components, TTI, Charcroft etc., as they often know sources even if they do not represent them.