Supply original MMBT3904TT1G, Transistors - Bipolar (BJT) - Single, by ON Semiconductor

The MMBT3904TT1G is a small-signal NPN transistor designed for general-purpose amplification and switching applications in electronic circuits. It is part of the popular 2N3904 series of transistors widely used in various electronic devices.

Key Features:

• NPN Transistor: Utilizes the NPN bipolar junction transistor configuration, consisting of a layer of P-doped semiconductor (the "base") sandwiched between two layers of N-doped semiconductor (the "emitter" and "collector").
• Small Signal Amplification: Suitable for amplifying small signals in electronic circuits, such as audio signals, sensor outputs, or data signals.
• Switching Applications: Can be used as a switch in digital or analog circuits to control the flow of current based on the input voltage or current.
• High Current Gain (hFE): Offers high current gain, allowing small base currents to control larger collector currents, making it efficient for amplification purposes.
• Low Saturation Voltage: Features low saturation voltage, minimizing power dissipation when the transistor is in the fully conducting state.
• Small Form Factor: Available in small surface-mount or through-hole packages, making it suitable for compact electronic designs.
• High Frequency Operation: Capable of operating at high frequencies, suitable for RF (Radio Frequency) circuits and other high-speed applications.
• RoHS Compliance: Complies with the Restriction of Hazardous Substances (RoHS) directive, ensuring environmental friendliness and regulatory compliance.

Applications:

• Amplification: Used as a signal amplifier in audio amplifiers, sensor interfaces, and instrumentation circuits.
• Switching Circuits: Employed in digital logic gates, relay drivers, LED drivers, and power management circuits for switching functions.
• Oscillators: Integrated into oscillator circuits for generating clock signals, sine wave oscillations, and RF signals.
• Voltage Regulation: Utilized in voltage regulator circuits, voltage references, and voltage-controlled oscillators.
• Mixers and Modulators: Used in RF mixers, modulators, and demodulators for signal processing in communication systems.
• Pulse Circuits: Integrated into pulse generators, pulse-width modulation (PWM) circuits, and pulse amplifiers.
• Frequency Multipliers: Employed in frequency multiplier circuits for RF and microwave applications.
• Test and Measurement: Utilized in test and measurement equipment such as signal generators, function generators, and oscilloscopes.