LT3080 Part Number Suffixes - Page 1
Forum section: electronics / beginners

author: jyaan
author_rank: Contributor
timestamp: March 29, 2012, 08:46:45 pm
content: I want to order an LT3080 to play around with Dave's design but I don't understand the differences in the TO-220 parts. They list LT3080ET#31PBF, LT3080ET#PBF, and LT3080IT#PBF. So, there are IT and ET versions, which seem to have something to do with temperature, as well as a #31PBF or #PBF option. What do they mean?

author: Bored@Work
author_rank: Super Contributor
timestamp: March 29, 2012, 09:47:10 pm
content: Read the datasheet.

author: jyaan
author_rank: Contributor
timestamp: March 30, 2012, 07:38:06 am
content: I did, and initially didn't find anything. Can't count on text searches for everything I suppose. After reading through again I found that I and E deal with temperature guarantees. Still haven't found what the difference is between 31PBF and PBF.

author: electrode
author_rank: Regular Contributor
timestamp: March 30, 2012, 07:51:12 am
content: The datasheet doesn't seem to say.My guess: PBF = Pb free = lead free; TRPBF = tape and real lead free.No idea what the 31 means (it doesn't appear in thedatasheetthat I found). Likewise, the one I found has EDD and IDD suffixes. Once again, no idea. :/

author: jyaan
author_rank: Contributor
timestamp: March 30, 2012, 07:54:31 am
content: Yea I should have caught on to PBF sooner... Anyways, I'm thinking 31 might be varying degrees of "lead free" -- Adhering to a tighter regulation set or something along those lines. But regardless, now I know I can just pick whichever is cheapest.

author: electrode
author_rank: Regular Contributor
timestamp: March 30, 2012, 07:57:22 am
content: Even then, there doesn't seem to be a difference in the RoHS:http://rohs.linear.com/linearmatdecl.aspx?part=LT3080ET%2331PBFhttp://rohs.linear.com/linearmatdecl.aspx?part=LT3080ET%23PBF

author: jyaan
author_rank: Contributor
timestamp: March 30, 2012, 08:01:13 am
content: Yea they seem exactly the same, but I can't imagine they would have two separate products for no reason.

author: jyaan
author_rank: Contributor
timestamp: March 30, 2012, 08:08:19 am
content: Seems DigiKey doesn't carry the #31PBF anyways.

author: metalphreak
author_rank: Frequent Contributor
timestamp: March 30, 2012, 09:54:57 am
content: Sometimes the differences in part numbers are just the packaging - Tape/Reel or Tray etc

author: george graves
author_rank: Super Contributor
timestamp: March 30, 2012, 12:21:56 pm
content: Quote from: BoredAtWork on March 29, 2012, 09:47:10 pm

author: baljemmett
author_rank: Unknown
timestamp: March 30, 2012, 01:26:37 pm
content: Quote from: metalphreak on March 30, 2012, 09:54:57 amYes. Following the links found on the 'ordering information' and 'packaging information' pages ofthe datasheet, we find:* Fromthe lead-free information, the PBF suffix indicates lead-free, TR indicates tape-and-reel, and there's also an optional field for special packaging flows (indicated in the #XXPBF example)* Fromthe packaging information, there are six alternative packaging options for 5-pin TO-220 devices in addition to the standard flow.Comparing the drawings for thestandard flowandflow 31, we see that the 31 suffix indicates the leads are pre-formed for mounting the part horizontally instead of vertically.(Edit: wow, messed those link tags up there!)