I could. The real problem I'm often trying to avoid is a board spin and increased labor.
I also probably am way too fussy about what qualifications I need/want to do before I put a replacement part in service. Like temperature tests and the like. The problem initially was that it sometimes took longer to do the tests than the stock sat on the shelf at the supplier. So by the time I got the qualification work done, the part was out of stock again. That's why I ended up doing the 'buy 10, and the backing stock all at the same time, with the backing stock being on a cancellable scheduled order' thing. On Mon, Sep 27, 2021 at 8:01 PM Chuck McCown <[email protected]> wrote: > Could you dead bug a tcxo? > > Sent from my iPhone > > On Sep 27, 2021, at 7:48 PM, Forrest Christian (List Account) < > [email protected]> wrote: > > > I try hard not to do single-source items. And usually have qualified > multiple parts. > > The ones which are kicking my rear this year are the 25Mhz MEMS > oscillators. These are the standard clock oscillator for anything > ethernet. I have a specific size I use and also voltage, temperature, > and ppm specs. > > This is of a part where mouser lists 118 potentially-compatible parts. > Of all of these 118 types, right now mouser has 1 in stock. As in 1 > total piece, not one type. Many of these have tens of thousands on order, > but with lead times into 2022 or sometimes 2023 at this point. > > I've qualified no less than 5 different oscillators this year for this > part. The problem has been how inconsistent the supply is. I finally > figured out how to use the (cancellable) scheduled delivery to take 10 in > for qualification, and schedule a few months months worth to come in 30 > days or so. And then scheduled reorders for at least a years worth of > demand. But even that bit me in the rear when mouser had to cancel the > reorders on one part due to lack of supply. > > The part I'm dealing with today has been one where we had a scheduled > order for, yet the due dates kept getting pushed out and out. The last > note we got was basically that the vendor could not provide an estimate at > this time. So I'm off finding another part. In this case, I've lucked > out and what used to be a single vendor type of part is now available from > a couple of other manufacturers in a form which has the same pinout but > slightly different specs (as in need a firmware update different specs). > > > On Mon, Sep 27, 2021 at 5:49 PM Chuck McCown via AF <[email protected]> > wrote: > >> I try to have at least two sources for everything. But I don’t have for >> enclosures and din rail snaps. I did have to substitute two choke coils >> for a common mode double choke. I have seen some of my problem parts >> shipping now. Plastic sdr11 conduit seems to be coming down. Lumber >> prices are down. I am optimistic. But I normally am. >> >> Sent from my iPhone >> >> > On Sep 27, 2021, at 4:03 PM, Forrest Christian (List Account) < >> [email protected]> wrote: >> > >> > >> > I'm getting really tired of dealing with supply chain issues. Like >> burnt out, don't want to do this anymore, I've had enough tired. >> > >> > Just the things I'm dealing with today: >> > >> > The last few days, all of my spare time has been related to reviewing >> options to replace a part which has become unobtainum. Like as in, >> manufacturer has moved from a long lead time to 'don't bother asking'. >> This seems to happen on a recurring basis now (with different parts) - >> versus pre-covid it was maybe once every year or two (since I'm careful to >> select parts to avoid this issue). I've had one part I've had to switch >> vendors on like 6 times now. >> > >> > And it's not just parts, my enclosure manufacturer for the >> rackinjectors sent us this gem today: >> > >> > "We had the enclosures ready for pickup since last week, but our road >> is under maintenance and the whole street got ripped off. My forklift is >> not able to get off from our driveway to the road because the step is very >> steep. I heard the city will start paving tomorrow. Hopefully we can load >> the pallet by Wednesday." >> > >> > Can we please go back to the way it was in 2019 sometime soon? >> > >> > -- >> > - Forrest >> > -- >> > AF mailing list >> > [email protected] >> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > > > -- > - Forrest > > -- - Forrest
-- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
