THS6012I bought on aliexpress, fake or what? - Page 1
Forum section: electronics / general

author: 1001
author_rank: Contributor
timestamp: December 05, 2024, 08:26:16 pm
content: I bought these current feedback amplifiers on aliexp for about 3 euros, from the x-ray they seem to have the pins connected to the die as in the datasheet.

author: 1001
author_rank: Contributor
timestamp: December 05, 2024, 08:31:14 pm
content: from the texas instriment evaluation board the silkscreen appears different, could they be fakes?if that were the case it would be strange, I don't think it would be worth rebranding similar chips or building fake ones from scratch.I know of only one other chip with the same case and the same pins connected to the die, the TPA6120A2

author: tom66
author_rank: Super Contributor
timestamp: December 05, 2024, 10:11:54 pm
content: I have never seen TI use that font, so that would scream fake to me.

author: marcopolo
author_rank: Regular Contributor
timestamp: December 05, 2024, 11:18:48 pm
content: Fakes with different batch numbers for each IC? I don't think so.They're just unsoldered ICs.

author: wraper
author_rank: Unknown
timestamp: December 05, 2024, 11:24:33 pm
content: Their surface is very obviously painted and marking is extremely dodgy as well.

author: wraper
author_rank: Unknown
timestamp: December 05, 2024, 11:27:48 pm
content: Quote from: marcopolo on December 05, 2024, 11:18:48 pmRegardless of what's inside the IC, their marking is 100% fake. Best case they're relabeled salvaged IC, worst case something entirely different.

author: tom66
author_rank: Super Contributor
timestamp: December 05, 2024, 11:38:24 pm
content: Quote from: marcopolo on December 05, 2024, 11:18:48 pmIt would be very trivial to make the laser marking machine put a different number on each part.

author: marcopolo
author_rank: Regular Contributor
timestamp: December 05, 2024, 11:50:52 pm
content: Quote from: tom66 on December 05, 2024, 11:38:24 pmBlacktopped ICs usually look as good as new and the same batch number is used on all circuits so as not to arouse buyers' suspicions.I've never seen such rotten ICs blacktopped.The top of the ICs should be scraped to see if any paint is peeling off.

author: wraper
author_rank: Unknown
timestamp: December 06, 2024, 01:24:32 am
content: ^You should use solvent, not scrape.

author: 1001
author_rank: Contributor
timestamp: December 06, 2024, 11:08:39 am
content: after visual and x-ray examination i could test quiescent current of each opamp (12-15mA) and bandwidth with voltage gain of 100,or do you suggest a better test?

author: Haenk
author_rank: Super Contributor
timestamp: December 06, 2024, 01:33:44 pm
content: The printing is 100% fake, still might be recovered chips. The first chip has a different dot, that's not looking good.

author: Postal2
author_rank: Frequent Contributor
timestamp: December 06, 2024, 02:19:33 pm
content: I constantly buy components with fake markings on Aliexpress, for MOSFET the defect rate is 1 out of 40, for microcircuits 1 out of 8 (no more).

author: 1001
author_rank: Contributor
timestamp: December 12, 2024, 11:19:56 am
content: I tested the bandwidth with a voltage gain of 100 (40dB) and at 20Mhz the opamp holds about 33dB.is it too out of spec? What do you think?

author: 1001
author_rank: Contributor
timestamp: December 24, 2024, 11:20:08 am
content: I tested the chip with a different dot, same results. at this point I think they are original chips, maybe used.I also noticed in a photo found on the xDevs.com site some TI chips with the same font in the marking, it is the board of an HP 53131.