So, I ordered OPA2604 from eBay... - Page 1
Forum section: electronics / general

author: FHR
author_rank: Contributor
timestamp: December 05, 2016, 05:48:15 pm
content: 5 pieces of these op-amps were for 2.40$.It was suprisingly cheap, even for eBay standards. So naturally, I had to try it. It was from a seller with 99.8% rating and feedback >38000.I hoped for unused old stock, but realistically speaking, I expected some cheap OPAMP (like LM741), with OPA2604 and BB label burned onto it.What I actually got: 5x SAMWIN SW2604A, which, according to the datasheet, is a PWM power supply controller. So not really what I was looking for.Contacted the seller and let's see, how they respond.

author: Ampera
author_rank: Super Contributor
timestamp: December 05, 2016, 06:46:59 pm
content: Normally ICs are pretty top notch on Ebay, the issues I have had was with 72-SIMM modules, I ordered 60ns FPM DRAM, and got 50ns EDO DRAM, which doesn't work whatsoever on my board. They accepted the return, but that was pretty stupid.

author: kxenos
author_rank: Frequent Contributor
timestamp: December 05, 2016, 06:58:26 pm
content: Quote from: TwoOfFive on December 05, 2016, 06:46:59 pmThey're pretty good! You throw a banana and they catch it in the air!

author: wraper
author_rank: Unknown
timestamp: December 05, 2016, 07:11:06 pm
content: Quote from: TwoOfFive on December 05, 2016, 06:46:59 pmLOL, price optimized specially for you. I wouldn't even try buying any opamps as chance getting real deal is pretty slim. even LM358 are counterfeited.

author: wraper
author_rank: Unknown
timestamp: December 05, 2016, 07:15:23 pm
content: I got some ATtiny24 optimized into ATtiny24A. But this is not nearly as bad as with what you will get inside those opamps.

author: anman
author_rank: Contributor
timestamp: December 05, 2016, 07:39:45 pm
content: I, too, was the case when the seller sent outright forgery. I had to present evidence.

author: Monkeh
author_rank: Super Contributor
timestamp: December 05, 2016, 07:50:01 pm
content: Quote from: TwoOfFive on December 05, 2016, 06:46:59 pmYou funny.

author: Ampera
author_rank: Super Contributor
timestamp: December 05, 2016, 07:55:15 pm
content: Whatever. It's from my experiences, I bought some J-lead memory ICs for a 1995 graphics card and it worked perfectly fine.

author: wraper
author_rank: Unknown
timestamp: December 05, 2016, 08:07:17 pm
content: Buying specialized ICs is relatively safe in most cases. Probably you will get "optimized" revision, date code (like those attiny24), analog grade (offset, noise) or speed grade (EPROM, RAM), but still basically the same part inside. But such parts as opamps, MOSFETS, voltage regulators are a big no. There may be virtually anything inside them and seem to work fine on the first glance.

author: Ampera
author_rank: Super Contributor
timestamp: December 05, 2016, 08:18:11 pm
content: Didn't know.

author: daqq
author_rank: Super Contributor
timestamp: December 06, 2016, 08:33:18 am
content: OK, I have to ask, when people are scammed all the time this way, you know you are very likely to be scammed, why do it? You are just encouraging them.I wouldn't say anything if it was an ancient IC that there are twelve piece of left in the world and you need it desperately, but anything else?

author: DimitriP
author_rank: Super Contributor
timestamp: December 06, 2016, 09:29:30 am
content: Quoteebay shmebay. Who was the seller?

author: Zero999
author_rank: Super Contributor
timestamp: December 06, 2016, 09:41:25 am
content: I know ebay sellers often deal in fakes but this is probably an honest mistake, as the SW2604A is totally different IC, not even an op-amp. I'd expect an NE5532 or some other cheap op-amp marked OPA2604.

author: FHR
author_rank: Contributor
timestamp: December 07, 2016, 04:48:09 pm
content: Here's a link to that particular auction.http://www.ebay.com/itm/5pcs-OP-AMP-IC-BURR-BROWN-BB-TI-DIP-8-OPA2604AP-OPA2604-100-Genuine-/261992551627The seller responded that he is sorry and offered refund or resend. I chose the "resend", because I'm really interested in what I will get.In the meantime, I ordered 4x OPA2134PA straight from TI for quite a bit more money (~4$ per chip).