View bsp300 datasheet:

BSP 300 SIPMOS ® Small-Signal Transistor • N channel • Enhancement mode • Avalanche rated • VGS(th)= 2.0... 4.0 V Pin 1 Pin 2 Pin 3 Pin 4 G D S D Type VDS ID RDS(on) Package Marking BSP 300 800 V 0.19 A 20 ? SOT-223 BSP 300 Type Ordering Code Tape and Reel Information BSP 300 Q67050 -T0009 E6433 BSP 300 Q67050-T0017 E6327 Maximum Ratings Parameter Symbol Values Unit Continuous drain current ID A TA = 25 °C 0.19 DC drain current, pulsed IDpuls TA = 25 °C 0.76 Avalanche energy, single pulse EAS mJ ID = 0.8 A, VDD = 50 V, RGS = 25 ? L = 105 mH, Tj = 25 °C 36 Gate source voltage VGS ± 20 V Power dissipation Ptot W TA = 25 °C 1.8 Semiconductor Group 1 02/12/1996 BSP 300 Maximum Ratings Parameter Symbol Values Unit Chip or operating temperature Tj -55 ... + 150 °C