Replacement of Panasonic Plasma parts (DAF30, 30F131, RFUH25, DG302, RJP30H2A, RF1501N)

The original Panasonic parts for the NeoPlasma series 30 and 50 are slowly going extinct. As I am a big fan of those devices, I am spending some time to find alternatives.

The parts listed here are susceptible to failure on SC or SN boards, respectively, and SS boards.

Use this information at your own risk! This is my result of doing research and experiments with no long-term experience.

Diode DAF30 (DA3DF30A)

Can be replaced with STTH20R04G. The datasheets are a perfect match. If you want more juice, the STTH30R04G will deliver it, it's a monster diode. I recently used STTH20 twice as substitute and it runs perfectly fine with normal temperature.

A STTH30 recently also worked fine in a 42VT30.

Diode RFUH25

Why Panasonic is using this diode alongside the DAF30 is a mystery to me. The specs read the same. Maybe there is some subtle detail I don't understand. I think the STTH will fit here, too.

Diode RF1501N

And yet another diode, which looks the same as the others. From the specs I cannot see any significant difference to the DAF30 and RFUH25. The DAF is a few nanoseconds quicker at recovering. They are dirt cheap and available from DigiKey or Mouser or even cheaper HERE on Aliexpress. The chinese source is legit. I have tested and used the diodes successfully.

IGBT Transistor GT31F131

Can be replaced with FGD4536. That I know for sure, because I fixed a TX-P50GT30 and a TX-P55VT30 with those successfully. Alas, this device is also discontinued. As of April 2017, DigiKey had still more than a thousand on stock. I for sure have ordered a sack full of them for the years to come, calculating that each scan board eats six of them. My next guess would be the IRG7RA13U. Also difficult to get from trusted sources.

IGBT Transistor DG302

This transistor seems to be the strongest in the bunch. 250A peak and 40A continuous current. It's good to have a bunch of them on stock. I don't know any exact replacement for this one. It's the gold nugget of the circuit.  The FDG4536 might be a viable candidate. It is difficult to tell because the interval for the 250A peak current is not specified in the minimal data, which is available for the DG302. The FGD goes up to 220A for half-sine, pulse-width 1µsec and its switching times are even lower than the DG's.

In the meantime I have tested a 42VT30 with the FGD instead of DG and it runs perfectly fine. The FGD run at around 55°C with the original heat sink glued on top and that is totally normal.

I am happy to finally share a source of legit DG302 on Aliexpress! They measure exactly like the originals and one did work flawlessly recently in a 42VT30.

I think the DG could replace all the IGBTs. I'll try that in my next 7 blink patient.

IGBT Transistor RJP30H2A

Again, I fail to see the distinctive difference to the DG302 und 31F131 besides the 5A less collector current. I recon they could have built the whole thing with DGs exclusively. This type isn't used in the 50 series anymore. I have replaced them successfully with FGD4536. Even Panasonic uses an 31F131 instead in the scan board of the TX-P55VT30.

Generally, the problem with the data given in the sheets for the maximum  pulse current is difficult to compare as the manufactures use different pulse lengths. The F131 is rated for 3µsec, the DG301 datasheet doesn't tell anything about it, and the FGD4536 is rated for <1µsec. This leaves the hobbyist with trial and error as the only option.

Things are looking good

To summarize: with the RF1501, the STTH20/30, the FGD4536, and the DG302, fixing our beloved Panasonics will be no problem in the near future.

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