The recommended operating voltage range for the BFR91A is 4.5V to 18V, with a typical voltage of 12V.
To ensure proper biasing, connect the base of the transistor to a voltage divider network that provides a stable voltage, and use a current-limiting resistor in series with the base to prevent excessive current.
The maximum collector current rating for the BFR91A is 500mA, but it's recommended to operate within 200mA to ensure reliability and prevent overheating.
Yes, the BFR91A can be used as a switch, but ensure the base is driven hard enough to saturate the transistor (Vbe ≈ 0.7V). Also, consider the collector-emitter saturation voltage (Vce(sat)) and the switching frequency to avoid overheating.
Use a heat sink with a thermal resistance of ≤ 10°C/W, and ensure good airflow around the transistor. Also, consider using a thermal interface material to improve heat transfer between the transistor and heat sink.
