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Having characterized the Tokin SIT for Vgs and transconductance at 24V at 1.5A Ids, I went through my stash of P-channel FETs for a possible match for a DEFiSIT follower.

Parts that I tested are 2SJ162, 2SJ618, IRFP9240. They were all very far away from the Vgs of the Tokin SIT. Interestingly, The 2SJ162 LATFET and the Tokin SIT both have a negative tempco so the Ids falls with temp for the DEFiSIT pair.

I was just about to power down the instruments when I remembered the hockey pucks bought for the F4 beast. Connected the P-channel hockey puck to the curve tracer and BAM! The Vgs of this part is within about 100mV of the Tokin SIT at 24V Vds at 1.5A Ids. The P-Channel puck has a higher Vgs than the Tokin SIT so the pair will have less current than planned.

Quickly lashed up the Tokin SIT to the IXYS hocky puck and POW! Nice steady Ids ~ 710mA after a short warm-up. Increasing voltage rails increases Ids. If you must have 1.5A Ids, just increase the rail voltages.

The IXYS hockey puck that I had on hand and used is the IXTN210P10T. This part at -30V at -2A bias is about 10% of DC SOA and less than 10% of rated max power dissipation.

Looking forward to trying this further when my Tokin SITs show up.