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I've come across a few parts that have ND at the end of their part number on Mouser and DigiKey. I can order the part with the ND at the end or not. What does that mean?

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  • \$\begingroup\$ Was searching everywhere for an answer. Looking at Atmega328p-pu & ATTINY85-20PU (@digikey) both default to -ND versions when you attempt to buy them, but no explanation of what ND stands for. Thanks for asking. Now I know I can just ignore it. \$\endgroup\$ – raddevus Jul 4 '17 at 14:49
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I've never seen the ND suffix at Mouser, only at Digi-Key. According to a blog article at Skywired:

In those days, the “-ND” suffix meant No Discount. Prominently displayed on the catalog front cover was a schedule of discount percentages, with better discounts for larger orders. Full reels of parts and certain expensive items had an “-ND” on their part number to mark them as exempt from the discount, but anything without the “-ND” was fair game. Later, Digi-Key started listing price breaks for intermediate quantities (10, 25, 100, etc.), and as that practice spread through the catalog, the “-ND” suffix became ubiquitous. Today, it serves only as Digi-Key’s signature, which is ironic given its origins as an exceptional case.

Source: Farewell, Digi-Key Catalog

In essence, I think it has no significant meaning, and parts with and without that suffix that have otherwise identical part numbers are identical parts.

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    \$\begingroup\$ I think of it as "Numero DigiKey" now. :) \$\endgroup\$ – Warren Young Dec 30 '12 at 20:00
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    \$\begingroup\$ I guess digikey is "No discount" on everything :D \$\endgroup\$ – Gustavo Litovsky Dec 30 '12 at 20:10
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    \$\begingroup\$ I've often wondered at the hidden cost of the "-ND" legacy. Imagine all of the hours spent typing those three extra characters -- both by engineers maintaining BOMs and by Digi-Key sales staff entering orders. One could argue consistency in part numbering or nostalgia, but it all comes at a cost. \$\endgroup\$ – HikeOnPast Dec 30 '12 at 22:17
  • \$\begingroup\$ Great. Thank you. Maybe I haven't seen it on Mouser, though I use both so frequently I forget which parts I've seen where. \$\endgroup\$ – Bob Baddeley Dec 31 '12 at 5:37
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    \$\begingroup\$ ...it would be entirely possible that an Acme part whose manufacturer's part number was 1234 might be assigned a Digi-Key part number of 5678-ND, with Digi-Key part number 1234-ND referring to something else entirely. \$\endgroup\$ – supercat Dec 31 '12 at 19:38

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