[sdiy] [hp_agilent_equipment] Re: [Electronics_101] Where to get capacitor and resistor kits?

cheater00 cheater00 cheater00 at gmail.com
Mon Mar 20 18:16:42 CET 2017


Hi Mark,
Great find, thanks.

One thing I didn't find out is this: if the part has an msl higher than 1,
then will it effectively stay at "zero time" while still on the tape?

Thanks a lot

On Mon, 20 Mar 2017 16:00 Mark Goldberg marklgoldberg at gmail.com
[hp_agilent_equipment], <hp_agilent_equipment at yahoogroups.com> wrote:

>
>
> On Mar 20, 2017 3:01 AM, "cheater00 cheater00 cheater00 at gmail.com
> [hp_agilent_equipment]" <hp_agilent_equipment at yahoogroups.com> wrote:
>
>
> I wasn't aware of the issue with moisture absorption by SMT parts. That is
> a very important consideration. What is the shelf life of such parts in a
> "pill box" enclosure, stored in a normal home environment?
>
>
> SMT parts have a Moisture Sensitivity Level or MSL rating that defines how
> long they can be outside the packaging before needing to be baked. If you
> get them from a reliable distributor, they will tell you the rating.
>
> IPC/JEDEC J-STD-020E will tell you more than you want to know about this,
> but you probably do not have access to it. Google will find lots of info if
> you search though.
>
> I have a reflow oven and can bake the parts. They do store parts in
> cabinets full of dry nitrogen, and in sealed bags with absorbent packs. The
> caps I got from Digikey were rated MSL 1 or unlimited.
>
> There also is a concern about oxidation of the contacts leading to bad
> soldering. Good flux will help that.
>
> I live in AZ where this is less of a problem than any humid place.
>
> Mark
>
>
>
>
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