It is complementary to the 2N3906 PNP transistor. It is designed for low current and power, medium voltage, and can operate at moderately high speeds. The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. A 2N3904 in a TO-92 package on a breadboard (lower left) The pinout from left to right is: Emitter, Base, Collector. This transistor is available in the TO-92 package & used in different applications like TV, switch, amplifier, etc.Common NPN bipolar junction transistor A 2N3904 made by Motorola. A similar 2N3904 NPN transistor is 2N2222A. Similarly, it supports 100MHz when it works as an amplifier. Once this transistor works like a switch then it supports 100mA of current. Generally, this transistor is made with Si material and used as an amplifier and switch. Thus, this is all about an overview of the 2N3904 NPN transistor datasheet. It is used in sound amplifiers because it includes high current gain, so used as an amplifier.This transistor can also be used in fast switching applications like PWM (pulse width modulation) due to its quick switching speed.When it works as a switch then controls heavy loads due to high gain and less saturation voltage.Usually, it is used in TVs & other home appliances.Both the voltages like VBE & VCB are high so they can be used for controlling voltage loads up to 40V.Used in amplifier modules like a signal amplifier, audio amplifier, etc.This transistor is used in driver modules like an LED driver, relay driver, etc.The applications of the 2N3904 NPN transistor include the following. In the 2N3904 transistor, the collector to base voltage or VCB is 40V whereas, in the 2N3906 transistor, the VCB is 60V. Here, 2N3904 transistor is NPN type whereas 2N3906 is PNP type. The main difference between 2N3904 & 2N3906 is the type of transistor. This simple LED flashing circuit is used in different devices like doorbells, toys for generating siren sounds, or flashing lights. For this circuit, a 6V DC battery otherwise power supply is used to provide power supply to the circuit. The circuit is designed with a 2N3904 transistor although we can design this circuit by using an NPN transistor. So this flash rate can be adjusted by changing the 1KΩ resistor value within the above circuit. The transistor used in this circuit works like a driver that uses a flash rate from a self-flashing LED. This LED flasher circuit uses a single transistor to flash a bright LED. This is an NPN transistor thus both the terminals like the emitter & the collector are reverse biased once the base pin of this transistor is connected to GND, Similarly, once a signal is given to the base pin of this transistor, then it is connected in forwarding bias. This circuit mainly uses the basic components which are mentioned above. This simple LED flasher circuit is a very simple circuit and easy to design that offers a visual cue in flashing LED form. This circuit can be built with basic components like breadboard-, connecting wires, battery-9V, capacitor, LED 5mm, LED flasher, resistors like 1k, 10k & 4.7K. LED flasher circuit using 2N3904 transistor is shown below. LED Flasher Circuit with 2N3904 NPN Transistor Once the base current is detached then the transistor will be turned off, so this phase is known as the cut-off region & the VBE could be approximately 600 mV. Voltage from the base terminal to the emitter (VBE) is 6V.Continuous Collector current or IC is 200mA.Voltage from collector to the emitter (VCE) is 40V.This transistor is available in To-92 Package The features and specifications of the 2N3904 NPN transistor include the following.
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