According to Fuji Electric, it's a discontinued power MOSFET.
https://www.fujielectric.com/produc...box/doc/pdf/spacification/Revisedtype_03e.pdf
https://www.fujielectric.com/produc...box/doc/pdf/spacification/Revisedtype_03e.pdf
The yoycart part isn't even the same package. I'd keep well away from that one.
With so many fake parts from China, I order mine through a agent from Japan. Total cost is not much more than the asking price from China.
Looks like another bad experience with AliExpress for me. I purchased these when the price was $22.50 for 10, then the price shot up. Now I received a message from the seller “items out of stock”. Really?? There was plenty when I ordered. But now they can sell under a different name with higher prices.
That's bad news. 🙁
I ordered mine at the initial low price and I received an email two days ago that it was on its way.
I ordered mine at the initial low price and I received an email two days ago that it was on its way.
Vunce, after my initial problems, I was able to order from Ali Express. They are on the way. I can send you half, if they arrive and if the are legit 
I should mention that Vunce sent me some PCBs that I needed and so I am simply returning the favor. But I have been blessed countless times by Papa’s generosity and from others. Not to mention the awesome support and knowledge sharing in this forum. Just trying to do my bit.
I just got a notification that my Ali order was canceled and refunded. Maybe that is the universe's way of saying, "You need to finish the J2 chassis transplant, the F5 Mini project, the Singing Bush tweaks, Iron Pre, 2SK79 B1 buffer, etc etc etc before you start another VFET project."
I can relate. I needed a laser cutter and didn't want to fall afoul of the usual ebay drop-shipping nightmares so I ordered direct from the importer yesterday. They refunded me within 6 hours, stating that my nearest warehouse was out of stock. D'Oh!
Same thing here :
My order, first "confirmed", has then been "closed" and refunded.
All the listings for K2087 seem to be gone (there were two or three, of which one had the picture without Tokin logo).
So it wasn't for real ...
The Evil Pass would have purchased them all, but the Nice Pass bought a just few so that he could design a nice project of them for DIYers.
Assuming they pan out you will see that before long...
Assuming they pan out you will see that before long...