2N5401 datasheet by Philips Semiconductors

2N5401 Frequently Asked Questions (FAQs)

• What is the maximum safe operating temperature for the 2N5401?
  The maximum safe operating temperature for the 2N5401 is 150°C, but it's recommended to operate it at a maximum of 125°C for reliable performance.
• Can I use the 2N5401 as a switch in a high-frequency circuit?
  While the 2N5401 can be used as a switch, it's not ideal for high-frequency circuits due to its relatively high transition frequency (ft) of 30 MHz. For high-frequency applications, consider using a transistor with a higher ft, such as the 2N5551.
• How do I ensure the 2N5401 is fully turned off in a digital circuit?
  To ensure the 2N5401 is fully turned off, make sure to provide a sufficient base-emitter voltage (Vbe) of at least -5V to -10V, depending on the specific application. Additionally, use a suitable base resistor to limit the base current.
• Can I use the 2N5401 in a linear amplifier circuit?
  Yes, the 2N5401 can be used in a linear amplifier circuit, but it's not the best choice due to its relatively low current gain (hfe) of 10-50. Consider using a transistor with a higher hfe, such as the 2N3904, for better performance.
• What is the maximum collector-emitter voltage (Vce) that the 2N5401 can handle?
  The maximum collector-emitter voltage (Vce) that the 2N5401 can handle is 150V, but it's recommended to operate it at a maximum of 120V for reliable performance.