Hi, I have a small Crest sonic cleaner that I am looking to find a transistor replacement that is on the power board for the transducer, as the original transistor is obsolete. The transistor in question is part number IRG4BC30U. Using the specs on the website looking for a similar match I find IRG4PC30UPBF but it is only available in large quantities and I only need one. The package TO-220-3 is what my original one is but it doesn’t matter as the transistor is extended with wires from the PCB and mounted to a flat aluminum heat sink, so as long as it has leads I can solder onto, any package will work. The IRG4PC30UPBF has a TO-247-3 package which is a little bigger and is fine, just wish it was sold each and not bulk. Wonder why that is?
I did a chat with Digikey support and they couldn’t find any exact matches but suggested part numbers HGTP12N60C3D, SGP23N60UFTU,(sorry I tried to put links but the system only let me put 2) which are similar but some have slightly different Vce(on) (Max) @ Vge, Ic specs or Switching Energy. The SGP23N60UFTU seems the closest, its switching energy is 115/135 vs 160/200 on the IRG4BC30U which I would think would be ok as it’s a lower value then the original, but its Vce(on) (Max) is 2.6 vs. 2.1 on the IRG4BC30U. I’m not an engineer so I don’t know if these little variations are all that important and if one of these will work? Or perhaps another that would work that I haven’t listed. I don’t have a schematic which I’m sure would help. This transistor controls the on off signal to a single ultrasonic transducer. I was in the middle of using the cleaner and the Sonics stopped. It blew a glass 2A fuse on the transducer power board, and upon removing the suspected transistor and testing it with my transistor tester it tested as 2 resistors and not a transistor. All pins were grounded to each other. So I am pretty confident this is the issue. Any help would be greatly appreciated.