The MMBT3904M 1N is a general-purpose NPN bipolar junction transistor (BJT) manufactured by Jiangsu Changjiang Electronics Technology Co., Ltd (JCET). It is designed for low to medium current and voltage applications, commonly used in switching and amplification circuits.

Applications:

• General Purpose Amplification
• Switching Circuits
• Signal Amplification
• Driver Circuits
• Oscillators

Features:

• NPN Transistor
• Low Collector-Emitter Saturation Voltage
• High Transition Frequency
• Surface Mount Package (SOT-23)
• Lead-Free Finish

Benefits:

• Versatile Application: Can be used in various amplification and switching roles.
• Efficient Switching: Low saturation voltage helps reduce power loss in switching applications.
• Good High-Frequency Performance: High transition frequency allows it to operate effectively at higher frequencies.
• Compact Design: The SOT-23 package allows for dense circuit layouts.
• Environmentally Friendly: Lead-free finish ensures compliance with environmental regulations.

Additional Details:

The MMBT3904M 1N is typically housed in a SOT-23 package, making it suitable for surface mount assembly. Key parameters include collector-emitter voltage (VCEO), collector current (IC), and power dissipation (PD). Always refer to the JCET datasheet for detailed specifications and application guidelines. Careful biasing is crucial for amplifier applications. When used as a switch, ensure sufficient base current is provided for saturation. The "1N" likely represents a specific manufacturing or lot code. This BJT offers a reliable solution for many general-purpose applications.