From :
http://www.microchip.com/pagehandler/en-us/family/8bit/architecture/pic18.h=
tml

PIC18 "J" Series:
Deigned for high memory density, cost sensitive applications.

PIC18 "K" Series:
Provides the highest performance with benchmark nanoWatt XLP
extreme low power consumption.


Also:

http://www.microchip.com/stellent/idcplg?IdcService=3DSS_GET_PAGE&nodeId=3D=
2553&param=3Den028357

http://www.microchip.com/stellent/idcplg?IdcService=3DSS_GET_PAGE&nodeId=3D=
2895&param=3Den541407

I have not found any side-by-side comparision, but one major
thing seems to be that K uses up to 5V supply and J 3V...



FWIW...

Jan-Erik.



Peter wrote 2013-07-29 11:48:
> Spent most of the day without any success, researching on Microchip site
> and back archived emails + web, looking for a possible answer to the
> following:
>
> What does the  "K" in Microchip part numbers mean for example PIC18F44K20=
 ?
> or
> What does the "J" in Microchip part numbers mean for example PIC18F46J50 =
?
>
> I just picked these two from a list,thinking that it would help in
> researching ... but sigh ...
>
>
> datasheets for reference:
> http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=3Den026338
> http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=3Den539708
>
> When you go to almost the last page; to section "PRODUCT IDENTIFICATION
> SYSTEM"
> it offers no help.
>
> I found a previous (archived post back in 24/06/2011)post:
>
> [PIC] Figuring out Microchip part numbers?
>
> by HaroldHallikainen  (with reference to different PIC)
>
> ..but isn't quite what I'm after... but in a way close.
>
> Having been away from PIC's for some years, Microchips product range has
> grown drastically.
>
> I don't have a part in mind yet to point this post to, otherwise I would
> link it here.
>
> I'm hoping there might be a document that explains this, or at least
> narrows it down a little.
>
> Does anyone know of any documentation of sorts that might explain the
> PIC part numbers?
>
> else what terms to type in to search for.
>
> Thanks
>
> Peter
>
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