2N3904 Transistor NPN 40V 200mA 625mW TO-92

2N3904 Transistor is a popular NPN transistor (BJT) used for general-purpose low-power switching and amplification. With a collector-emitter voltage of 40V, collector current up to 200mA, and a power dissipation of 625mW, it is widely used in signal processing, switching circuits, and microcontroller interfaces.

Key Features:

• NPN Silicon BJT: Suitable for amplification and switching applications.
• Low Collector-Emitter Saturation: Ensures efficient switching performance.
• High-Speed Switching: Fast response for digital and analog circuits.
• General Purpose: Works well in signal processing and control systems.
• TO-92 Package: Compact, through-hole form factor.

Technical Specifications:

• Transistor Type: NPN
• Collector-Emitter Voltage (V_CEO): 40V
• Collector-Base Voltage (V_CBO): 60V
• Emitter-Base Voltage (V_EBO): 6V
• Collector Current (I_C): 200mA
• Power Dissipation (P_D): 625mW
• DC Current Gain (h_FE): 100–300
• Transition Frequency (f_T): 250 MHz
• Package: TO-92

Mechanical Specifications:

• Package Type: TO-92 (Plastic through-hole)
• Lead Pitch: Standard 1.27mm spacing
• Pin Count: 3 pins
• Dimensions: ~4.5mm x 4.5mm x 5mm body
• Weight: Less than 0.5g

Pin Configuration:

• Pin 1: Emitter
• Pin 2: Base
• Pin 3: Collector

Schematic Diagram, Connection, Wiring and Pinout:

• Usage: Place a base resistor (typically 1kΩ) when driven by a microcontroller.
• Load: Connected between the collector and VCC for switching applications.
• Control: Base receives signal to turn ON/OFF the collector current path.

Datasheet and Documentation:

• Download 2N3904 Datasheet (PDF)

Applications:

• Switching Devices: For driving relays, LEDs, or other loads.
• Signal Amplification: Audio and RF pre-amplifier stages.
• Digital Logic Interfaces: Level shifting and interfacing.
• Pulse Generators: Square wave generators and clocks.
• Motor Drivers: Small DC motor control via PWM signals.

Equivalent Models:

• BC547: Similar NPN transistor with slightly different characteristics
• 2N2222: Higher current NPN alternative in TO-92/metal can
• SS8050: High gain and current NPN transistor

Package Includes:

• 1 x 2N3904 Transistor NPN 40V 200mA 625mW TO-92