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came across a story of how manufactures sell lower quality components and TI OMAP

 

http://zeptobars.ru/en/read/OPA627-AD744-real-vs-fake-china-ebay

 

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~~What happened here? Some manufacturer in China put an effort to find cheaper substitute for OPA627 - it appeared to be AD744. AD744 has similar speed (500ns to 0.01%), similar type (*FET), supports external offset compensation. AD744 also support external frequency compensation (for high-speed high-gain applications) but there was no corresponding pin on the OPA627 - so this feature is unused. On the other hand AD744 has higher noise (3x) and higher offset voltage (0.5mV vs 0.1mV). So they bought AD744 in the form of dies or wafers, packaged them and marked as OPA627. It does not seems they earned alot of money here - it's more of an economic sabotage. Good thing that they did not used something like LM358 - in that case it would have been much easier to notice the difference without looking inside...

 

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