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enter image description here

Why does the Vgs=15V line stop at around Vds = 3V? Is it just because the behaviour can be guessed by seeing the lower Vgs lines, or does the MOSFET not work at Vds>3?

This is from the IRFZ44N datasheet.

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    \$\begingroup\$ The transistor is conducting around 150A at the point where that curve ends. What is its absolute maximum current rating? \$\endgroup\$ Jan 4 at 12:22
  • \$\begingroup\$ @asker Friendly reminder: If one of the answers below answered your question, don't forget to click the green check mark to accept the answer. Thanks! \$\endgroup\$
    – TypeIA
    Jan 6 at 20:05

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The IRFZ44N has a maximum pulsed drain current IDM of 160 A:

enter image description here

That fits well with your graph...

enter image description here

Note the maximum continuous drain current ID is much lower. Figure 11 in the linked datasheet explains how they arrive at the maximum pulsed current.

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Is it just because the behaviour can be guessed [?]

Yes. The device gets driven past its ratings and is degraded and/or destroyed :)

Now, jokes aside, for some very high-pulse-capable devices, it may be hard to experimentally measure things. That's rare, though. Normally, the graphs just end where you should stop if you were to apply it in a circuit and get a higher rated device as well.

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