Transistor - NPN, 100V 5A (TIP122G)

Have you ever tried to power a motor solenoid high-power LED strip or relay directly from your Arduino or Raspberry Pi? You quickly find out that your microcontroller's pin can only supply a tiny amount of current while these "heavy" loads demand full Amps to work.The TIP122G is the classic go-to solution for bridging this exact gap. It's a high-power NPN Darlington transistor which acts as a simple high-current switch that your microcontroller can control.Massive Gains with DarlingtonA Darlington transistor is essentially two transistors in one package. This gives it an incredibly high DC Current Gain (hFE)—in this case a minimum of 1000.What this means for you: An absolutely tiny safe logic-level signal (like the 3.3V or 5V from your microcontroller pin) can be used to control a much much larger load. This transistor is designed explicitly for general-purpose amplification and low-speed switching making it an ideal digital "on/off" switch for your large-scale projects.