edit - not an error, a TO-220 in the SX-1250 AWR-106 Q8 (-25v 16mA) position would be overkill to the point of introducing problems (gain and base draw from the zener reference for one). A TO-126 with enough overhead to fit a small clip on heat sink would be almost overkill but just my style...
Ah HAH, the -25v series pass element on the SX-1250 's AWR-106 power supply "stabilizer assembly".
1 mA to the protection's DC differential detector, 15mA to the preamp circuits.
I take it that the board already exists? Nice....
That on-semi's voltage is a bit low, on fault or unexpected conditions, it can see higher voltage, especially at sub 16mA currents, the
1.5k resistor won't keep the voltage under 50 - you are running a razor thin margin at the collector there...
Current 16mA, not a lot of extra draw expected. That's about 350mW assuming the -65v and a 1.5k (2w) dropping resistor. Their own calculations and reported voltages on the schematic calculate out to a 12 mA current (65 - 47)/1500 = 0.0012A, not the 16 mA shown on the main schematic...
Hmmm...
512-KSA1013YBU to-92L ecb 160v 1a .9w 100mhz 160-320hfe $0.34 (R=60-120, O=100/200, Y=160/320)
I / my posted parts lists for the SX-1250 use the TO-126 cased KSA1220
512-KSA1220AYS to-126 ecb 120/a160 1.2a 1.2w/20w 175mhz 35-320hfe $0.39 (R=60-120, O=100/200, Y=160/320)
The 1013 will fit the real estate, the 92L case will help with the dissipation, although I would LIKE to see the ksa1220 there, but if it don't fit....
oh well...
Will the boards be open sourced like AK's STK-0050 replacement, or available commercially like TxTurbo's SX-1980 AWR-154 Power Supply board?
Kudos to sregor on the quick and first KSA1013 response!!! (credit where credit is due!)