The 2N4401 is a popular NPN BJT Transistor, commonly used for low power switching and amplification in electronic circuits, it offering a reliable performance with a collector current rating of up to 500 mA and voltage handling up to 40 V. In this article, describes about pinout, characteristics and equivalent transistors for replacement.
2N4401 Transistor Pinout
To properly identify the pinout of the 2N4401 transistor in a TO-92 package, you just hold the transistor with its flat side facing you and the three leads (pins) pointing downward, then read the pins from left to right as Emitter, Base, and Collector.
This orientation helps ensure accurate pin identification and prevents incorrect wiring when placing the transistor in a circuit.
Features and Specifications
- Package: TO-92 (or TO-226)
- Material: Silicon planar epitaxial
- Transistor Type: NPN Transistor (BJT)
- Maximum Collector Current : 600 mA
- Maximum Collector-Emitter Voltage: 40 V
- Maximum Collector-Base Voltage: 60 V
- Power Dissipation: 625 mW
Equivalent Transistors
- 2N3904
- 2N2222A
- BC547
The 2N3904 is a very common general-purpose NPN transistor with similar characteristics, though it handles lower current.
2N222A is another very common NPN transistor with similar applications to the 2N4401, often considered a direct replacement in many circuits.
BC547 transistor is very popular and widely available NPN transistor that is also suitable for many of the same applications.
Note: Before replacing with the transistor, you always check its pinout configuration and after replace it it with the actual place of the old transistor.
PNP complementary
The complementary PNP transistor for 2N4401 is 2N4403.
Applications
- General purpose transistors.
- Small signal amplifications.
- Switching circuits.
