Interesting that you've encountered counterfeit AD633s. I didn't realize that counterfeit AD633s were a big thing; I just wrote about this one case. I'd be inte

Interesting that you've encountered counterfeit AD633s. I didn't realize that counterfeit AD633s were a big thing; I just wrote about this one case. I'd be interested in hearing more about your counterfeits, like how much you paid and where you got them. (I'm guessing on eBay from China.) I wonder if your counterfeits also had the RC4200 multiplier inside. Not working and getting hot is kind of what I'd expect since the AD633 takes a voltage as input and the RC4200 takes a small current. It's kind of strange that they'd substitute a multiplier chip, but one that wouldn't work. It's like the counterfeiters were trying to be clever, but didn't read the datasheet closely.