Electronics > Projects, Designs, and Technical Stuff

LM311P issue

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Redeeman:

--- Quote from: ozcar on August 29, 2019, 01:40:34 am ---I found the old thread:

https://www.eevblog.com/forum/chat/fake-andor-mislabelled-lm311-)/

Poster there said that they might be mislabelled LM358s. At the time I ran into the issue, I did a quick test on the supposed LM311s I had received, and it seemed plausible that they too were LM358s in disguise.

I wonder if yours are similar?

--- End quote ---

i looked at both these fake lm311's and real lm358 on my rigol scope, they had identical response, im 99.9% sure they were lm358's.

I should note however, that I have bought many of these jellybean things on aliexpress and they have behaved as expected, whereas a large amount of those i've bought on ebay have been fakes of varying physical obviousness

HendriXML:
After this lemon, I received 5 LM335Z temperature IC's which where instead some kind of transistor.

It's nice to have a bit of a stock, sourcing large quantities from reliable sources however can become expensive.

But I also know that if I exactly know/knew what I would need, buying only that from reliable sources would be cheaper.

But it still nice to have some stock for a quick experiment, however I'm more and more turning towards reliable sources. The packaging is better, the labelling is better, the specs are more valid. In a way that is worth some money too.

Trying to use fake components cost a lot of time to debug, that's what bothers me most.

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