Hey i am chasing a replacement for an IGBT module, part number BSM50GX120DN2. It says this part is obsolete
Welcome to the Technical Forum. Unfortunately I am not finding an alternative for this part.
Take a look at the datasheet of the FP40R12KE3GBOSA1. The pinout appears to be identical, and a quick overview of specs looks like it is at least similar. I found a datasheet for the BSM50GX120DN2 here.
Here’s a link to a few others with the same pinout, for comparison.
No guarantees any of these would be close enough in any given application, so compare data carefully and proceed at your own risk, as these are for very high-power applications.