MJE18004

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The transistors family is huge and complex, but many specific types of transistors can be placed under broad categories such as Bipolar (BJT) and Field Effect Transistors (FET). This article focuses on one specific type of bipolar (BJT), the MJE18004, and its application field and working principle.

The MJE18004 is a NPN type of bipolar (BJT) transistor which is used primarily as a switch in most logic and computing circuits. It has the following electrical characteristics:

• Breakdown voltage (BVCEO): 45V
• Continuous collector current (IC): 800 mA
• Collector-Emitter saturation voltage (VCEsat): 0.2V
• Base-Emitter Voltage (VBE): 1.4V

The MJE18004 is an excellent choice for switching and logic applications since the low VCEsat ensures low off losses and ensures fast switching. This makes them suitable for high speed logic.

In terms of application, the MJE18004 is primarily used for high speed logic circuits. It can be used as a switch in logic circuits, switching high voltages and currents from one part of the circuit to the other. It can also be used as a buffer or driver to ensure high speed operation in logic circuits.

The MJE18004 is also used in power switching applications due to its high breakdown voltage, high collector current capability and low saturation voltage make it ideal for this application. It can be used to switch currents or voltages up to hundreds of volts.

The MJE18004 can also be used in low noise audio applications such as pre-amplifiers and filters. It can be used to amplify small changes in audio signals without introducing any background noise.

The working principle of the MJE18004 is based on the basics of bipolar transistor operation. To understand this concept, consider the simple circuit below.

In this circuit, the a base current (IB) is applied to the base terminal of the transistor. This small current creates a voltage drop across the base-emitter junction (VBE). This voltage is in turn amplified by a factor of the current gain of the transistor and creates a larger current flowing in the collector (IC). This small current controls the larger current, allowing us to control the flow of current from the collector to the emitter terminal.

The main advantage of the MJE18004 is its ability to control the collector current with a low base current. This allows the user to switch high current and voltages with low power, making it ideal for high speed logic and power switching applications.

In conclusion, the MJE18004 is a type of bipolar (BJT) transistor which is used primarily as a switch in most logic and computing circuits. It has the following characteristics which make it suitable for these applications: a breakdown voltage of 45V, a continuous collector current of 800mA, a collector-emitter saturation voltage of 0.2V, and a base-emitter voltage of 1.4V. Additionally, it has the advantage of being able to control the collector current with a low base current, making it suitable for high speed logic and power switching applications.

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