General > General Technical Chat

Chips pulled off dumped PCBs and then sold, due to the "chip shortage"?

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rsjsouza:
There's nothing really wrong with used parts; people have been reusing those in repair since the dawn of electronics. The practice of "rebranding" parts into more modern (and more expensive) models is also quite old as well - I remember in the 1980s how many old Germanium or otherwise underspeced power transistors were being remarked as powerful 2N3055s or BU208s, to the despair of the hobbyists and technicians.

tooki:

--- Quote from: Black Phoenix on August 30, 2022, 06:24:09 am ---That's not new...

Some listings from Xianyu app (Alibaba owned app for second hand items):

[photos of STM32s on bits of PCB salvaged by sawing off the rest of the board]

--- End quote ---
I don’t mind that at all: they’re being very clear that the chips are salvaged. They’re not trying to pass them off as new.

Faringdon:
Chips like UCC28070A are TSSOP20 and such small parts are ultra ESD sensitive....also, in the UCC28070A datasheet it gives a severe ESD warning about the chip.
I dont think chips like this are meant to be handled, solder pulled, or anything like that.....but i bet its going on.

SiliconWizard:

--- Quote from: langwadt on August 29, 2022, 10:21:58 pm ---there's money to be made so of course there is, and it isn't new, the shortage just makes it more profitable

--- End quote ---

Yep, there's been a constant stream of those on Aliexpress and the like for years. There's just even more demand now.

Gyro:
How did I know that one was coming?  ::)


--- Quote from: Faringdon on September 03, 2022, 07:51:11 pm ---Chips like UCC28070A are TSSOP20 and such small parts are ultra ESD sensitive


--- End quote ---

ESD sensitivity is a function of the Silicon, not the package.


--- Quote ---....also, in the UCC28070A datasheet it gives a severe ESD warning about the chip.

--- End quote ---

Well, it states the standard JEDEC HBM and CDM ESD ratings, like any other modern devce, if that's what you mean.


--- Quote ---I dont think chips like this are meant to be handled, solder pulled, or anything like that.....but i bet its going on.

--- End quote ---

If they not meant to be handled, it's going to give you a bit of a problem getting them onto your board isn't it?  You are the weakest link. As for solder pulls, that depends on where you source your parts from. You won't get solder pulls if you buy from a main distributor with proper traceability back to the manufacturer. If you chose to source them from somewhere dodgy then that's your funeral.

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