- DESCRIPTION: The ASI BLF177 is a N-Channel Enhancement-Mode MOSFET RF Power Transistor Designed for industrial and military applications in the HF/ VHF frequency range. MAXIMUM RATINGS ID 16 A VDS 110 V VGS ±20 V PDISS 220 W @ Tmb = 25 °C TJ -65 °C to +200 °C TSTG -65 °C to +150 °C θJC 0.8 °C/W