Fake chinese GT30F131, RJP30H2A under the microscope

In this blog I reported my experience with a chinese supplier. I came to the conclusion that both IGBT transistors were fake by measuring and visual inspection. Let's put them under the microscope!

First, the original RJP30H2A. Notice the extra notches to the left and right.

Now the fake. The notches are missing and the character font is different. Also, there are traces, which look as if the package has been sanded to remove the original marking and re-labeled.

The 30F131 original. Everything is crisp and precise.

The fake shows very strong signs of sanding and the labeling is sloppy and imprecise.

The 30F131 may look different, depending on the batch. The imprint "MX 18" and larger character size are actually valid, but the overall quality is just ridiculous.

For the images I have used the Andonstar A1. It is a decent device for its price.