Hello guys, it has been months that I thought of a project that I would like to sell, and today I decided finally to work on it. The main goal is to sell it, so I want components from reputable brands and reliable sources, I would really like to avoid components smoking and catching fire once in the house of the customer.
One of the most important one is a bipolar stepper driver, and I figured that an allegro A4985 would be perfect. On digikey, if I buy a thousand of them (which is really a LOT to start), the unit price is 1,52 dollars, fair enough.
The doubt is that on eBay and aliexpress, they sell entire pcb modules, already assembled with the required resistor and capacitors, at prices as low as one dollar or less, and they use the allegro a4988, which costs more than the A4985. I'm sure you saw them before, they're the typical stepper driver modules for 3d printers.
The price is so ridiculously low that I'm almost sure that they use counterfeit chips, but I want to ask you if they are really fake chips or they are actually original ones. I figured that maybe they have such a low price because they sell millions of them, I'm not really sure...
Obviously I want to build my product as cheap as possible, and if these modules aren't fake, then I don't see the point in spending 1.5 dollars on just the chip...