BC857B datasheet by NXP Semiconductors

BC857B Frequently Asked Questions (FAQs)

• What is the maximum operating temperature range for the BC857B?
  The maximum operating temperature range for the BC857B is -40°C to 150°C.
• Can I use the BC857B as a switch?
  Yes, the BC857B can be used as a switch, but it's not recommended due to its relatively low current gain (hFE) and high saturation voltage (VCE(sat)). It's better suited for amplifier applications.
• How do I choose the right resistor values for the base and collector of the BC857B?
  The choice of resistor values depends on the specific application and the desired current and voltage levels. A general rule of thumb is to choose a base resistor (Rb) that limits the base current to 1/10th of the maximum allowed current, and a collector resistor (Rc) that sets the desired collector current.
• Is the BC857B suitable for high-frequency applications?
  The BC857B has a transition frequency (fT) of 100 MHz, making it suitable for low- to medium-frequency applications. However, it may not be the best choice for high-frequency applications above 100 MHz.
• Can I use the BC857B in a Darlington pair configuration?
  Yes, the BC857B can be used in a Darlington pair configuration to increase the current gain and improve the overall performance of the circuit.