SWITCHMODE™
NPN Bipolar Power Transistor
For Switching Power Supply Applications

The BUL147 have an applications specific state–of–the–art die designed for use in electric fluorescent lamp ballasts to 180 Watts and in Switchmode Power supplies for all types of electronic equipment.
These high–voltage/high–speed transistors offer the following:

• Improved Efficiency Due to Low Base Drive Requirements:
  - High and Flat DC Current Gain
  - Fast Switching
  - No Coil Required in Base Circuit for Turn–Off (No Current Tail)
• Parametric Distributions are Tight and Consistent Lot–to–Lot
• Two Package Choices: Standard TO–220 or Isolated TO–220
• BUL147F, Isolated Case 221D, is UL Recognized to 3500 VRMS: File #E69369