This post describes for the semiconductor 21N50C3, SPW21N50C3, SPB21N50C3.
The function of this semiconductor is Vds=560 V, Cool MOS Power Transistor.
The manufacturer of this parts is Infineon.
See the preview image and the Datasheet PDF file for more information.
• New revolutionary high voltage technology
• Ultra low gate charge
• Periodic avalanche rated
• Extreme dv/dt rated
• Ultra low effective capacitances
• Improved transconductance