I'd choose a device designed for higher power dissipation and that can accommodate a heatsink, such as a TO-220. Be sure your replacement device has a similar or slightly lower Vgs (on), and a lower Rds. I don know what the DC-DC converter design looks like, so make sure Vds is greater than the output voltage, probably 200V min.
The device you have now will only have marginal improvement with a heatsink because it's package was not optimized to use a heatsink. There isn't enough info in the datasheet to calculate the thermals with a heatsink. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/87f146d0-07dc-4dea-88aa-620eed0527b1%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
