TIP122FP datasheet by STMicroelectronics

TIP122FP Frequently Asked Questions (FAQs)

• What is the maximum collector current that can be handled by each Darlington pair?
  The maximum collector current for each Darlington pair is 1 A, but it's recommended to derate the current to 0.5 A for reliable operation.
• How do I calculate the base resistor value for the TIP122FP?
  The base resistor value can be calculated using the formula: Rb = (Vcc - Vbe) / (Ib * hFE), where Vcc is the supply voltage, Vbe is the base-emitter voltage, Ib is the base current, and hFE is the current gain.
• What is the maximum power dissipation for the TIP122FP?
  The maximum power dissipation for the TIP122FP is 1 W per Darlington pair, but it's recommended to derate the power dissipation to 0.5 W for reliable operation.
• Can I use the TIP122FP as a switch or an amplifier?
  The TIP122FP is designed as a switch, but it can also be used as an amplifier in certain applications. However, it's not recommended to use it as a linear amplifier due to its limited bandwidth and gain.
• How do I protect the TIP122FP from back-EMF when switching inductive loads?
  To protect the TIP122FP from back-EMF, you can use a flyback diode (also known as a freewheeling diode) in parallel with the inductive load. This diode allows the current to continue flowing when the transistor is turned off, preventing back-EMF from damaging the transistor.