BUL741 datasheet by STMicroelectronics

BUL741 Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the BUL741?
  The BUL741 can operate up to 100 kHz, but the maximum frequency depends on the specific application and layout. It's recommended to consult the application note AN4578 for more information.
• How do I ensure the BUL741 is properly biased for optimal performance?
  To ensure proper biasing, follow the recommended biasing scheme in the datasheet, and make sure to decouple the supply voltage with a 10uF capacitor. Additionally, use a 1kΩ resistor in series with the base of the transistor to prevent oscillations.
• What is the maximum power dissipation of the BUL741?
  The maximum power dissipation of the BUL741 is 2W, but it's recommended to derate the power dissipation based on the ambient temperature and the thermal resistance of the package.
• Can I use the BUL741 as a switch?
  Yes, the BUL741 can be used as a switch, but it's essential to ensure the transistor is fully saturated (Vce(sat) < 0.5V) to minimize power losses. Consult the application note AN4578 for more information on using the BUL741 as a switch.
• How do I protect the BUL741 from overvoltage and ESD?
  To protect the BUL741 from overvoltage and ESD, use a voltage clamp or a transient voltage suppressor (TVS) diode, and follow proper PCB design and layout guidelines to minimize ESD susceptibility.