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?

  • \$\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
    Commented Jul 4, 2017 at 14:49

1 Answer 1


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.

  • 2
    \$\begingroup\$ I think of it as "Numero DigiKey" now. :) \$\endgroup\$ Commented Dec 30, 2012 at 20:00
  • 1
    \$\begingroup\$ I guess digikey is "No discount" on everything :D \$\endgroup\$ Commented Dec 30, 2012 at 20:10
  • 3
    \$\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
    Commented Dec 30, 2012 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\$ Commented Dec 31, 2012 at 5:37
  • 1
    \$\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
    Commented Dec 31, 2012 at 19:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.