SWITCHMODE
NPN Bipolar Power Transistor   
For Switching Power Supply Applications
   
The BUL44/BUL44F have an applications specific state–of–the–art die designed for use in 220 V line operated Switchmode Power supplies and electronic light ballasts. These high voltage/high speed transistors offer the following:
   
• Improved Efficiency Due to Low Base Drive Requirements:
    - High and Flat DC Current Gain hFE
    - Fast Switching
    - No Coil Required in Base Circuit for Turn–Off (No Current Tail)
• Full Characterization at 125°C
• Tight Parametric Distributions are Consistent Lot–to–Lot
• Two Package Choices: Standard TO–220 or Isolated TO–220
• BUL44F, Case 221D, is UL Recognized to 3500 VRMS: File #E69369