FJX3904TF

The FJX3904TF is an NPN bipolar junction transistor designed for general purpose switching and amplification applications. It features a maximum collector-emitter voltage of 40 V and a maximum collector current of 200 mA. The transistor offers a minimum DC current gain (hFE) of 100 at 10 mA collector current and 1 V collector-emitter voltage, ensuring reliable performance in low-power circuits.

With a typical transition frequency of 300 MHz, the FJX3904TF is suitable for applications requiring moderate frequency response. The maximum collector-emitter saturation voltage is 300 mV at 50 mA collector current and 5 mA base current, minimizing power loss during saturation.

The device is housed in a surface-mount SOT-323 package (also known as SC-70) with a maximum power dissipation of 350 mW. It can operate at junction temperatures up to 150°C, making it appropriate for compact designs with limited heat dissipation. The SOT-323 package is industry standard for small-signal transistors and facilitates automated assembly.

Typical applications include signal amplification, low-current switching, and interface circuits. The combination of moderate voltage rating, current handling, and frequency response makes the FJX3904TF a versatile choice for many low-power electronic designs.