My bad...just checked the IRFD220 datasheet and it's not easily heat-sinked. I blindly assumed it was a TO-220 or similar case.
The theta j-c for this device is 120 degrees C per watt, so if it's dissipating 1W and you're measuring 113F at the case, your junction is probably overheating. The double-whammy is that this device mounts close to the PC board, so that will expose the PCB's fiberglass to excessive heat. I'd change to a TO-220 case device with a small 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 [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/18fa1b7d-1db9-4001-a4f8-8a874e02b6d0%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
