2N4401 - NPN

2N4401 is a widely used NPN bipolar junction transistor (BJT) designed for general-purpose switching and amplification. It is frequently found in a standard TO-92 plastic package and is valued for its ability to handle moderate currents in compact electronic designs.

Key Specifications

The 2N4401 features the following electrical characteristics:

• Transistor Type: NPN Silicon Planar Epitaxial.
• Collector-Emitter Voltage (Vceo): Maximum of 40 V.
• Continuous Collector Current (Ic): Up to 600 mA (some sources list a sustained 500 mA).
• Power Dissipation (Pd): Rated at 625 mW at an ambient temperature of 25°C.
• DC Current Gain (hFE): Typically ranges from 20 to 300, depending on collector current.
• Transition Frequency (fT): 250 MHz, making it suitable for high-frequency applications.
• Operating Temperature: Ranges from -55°C to +150°C.