MMBT5401

The MMBT5401 is a popular NPN bipolar junction transistor (BJT) manufactured by Changjiang Electronics. It is commonly used in various electronic applications due to its reliability and performance characteristics.

Key Features:

1. Type: NPN Transistor
2. Package: Typically available in a TO-92 package, which is a cylindrical plastic housing with three leads extending from the base. This package is compact and suitable for through-hole mounting on printed circuit boards (PCBs).
3. Maximum Collector-Emitter Voltage (Vce): The MMBT5401 can handle a maximum Vce of around 60 volts, making it suitable for a variety of applications where moderate voltage levels are present.
4. Maximum Collector Current (Ic): It can support a maximum collector current of approximately 600 mA, allowing it to drive small loads effectively.
5. DC Current Gain (hFE): The transistor exhibits a DC current gain (hFE) ranging from 100 to 300, depending on the specific operating conditions. This high gain allows for effective amplification of input signals.
6. Transition Frequency (fT): The MMBT5401 has a transition frequency of about 250 MHz, indicating its capability for high-frequency applications.
7. Thermal Characteristics: The device has a maximum junction temperature of 150°C, which provides a good thermal margin for various operating environments.

Applications:

The MMBT5401 is widely used in:

• Amplification: It is often employed in audio and RF amplification circuits due to its favorable gain characteristics.
• Switching: The transistor can be used in switching applications, such as driving relays or controlling motors, thanks to its ability to handle moderate currents.
• Signal Processing: It is suitable for use in signal processing circuits, where it can amplify weak signals for further processing.

Electrical Characteristics:

• Collector-Base Voltage (Vcb): Typically rated at 60V.
• Emitter-Base Voltage (Veb): Usually rated at 5V.
• Power Dissipation (Pd): The maximum power dissipation is around 500 mW, which is important for thermal management in circuit design.

Conclusion:

The MMBT5401 from Changjiang Electronics is a versatile and reliable NPN transistor that is well-suited for a variety of electronic applications, from amplification to switching. Its robust specifications and performance make it a popular choice among engineers and hobbyists alike.