2N4901

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The 2N4901 is a bipolar transistor developed by On Semiconductor. It is designed for high performance audio and video amplification applications. This transistor can be used in a variety of applications, such as audio amplifiers, video amplifiers, line driving circuits, and switching circuits. The 2N4901 is constructed of a three layer semiconductor material, consisting of two P-type base layers, and an N-type collector layer. When power is applied to the base layer, a current is injected into the collector layer from the base layer, resulting in amplification of the signal.

The 2N4901 is a NPN transistor with an amplification index of 140 and a maximum current gain of 700. It has an excellent noise immunity and can support high voltage input and output signals. The transistor has a collector-emitter breakdown voltage of 120 volts and can handle up to 8.4 amps of collector current. It also has a low collector-base capacitance of 1.2 pF, making it suitable for high frequency switching applications.

The 2N4901 is used in applications that require high frequency, low noise amplification. It can be used in low noise audio amplifiers, video amplifiers, line drivers, and switching circuits. This transistor is also well suited for use in operational amplifiers, mixers, oscillators and voltage reference circuits.

The 2N4901 has an operating temperature range of -55°C to + 125°C and is available in a variety of packages, including TO-220, TO-92, SOT-23, and SIP-3. The 2N4901 is an ideal choice for applications that require high frequency operation and low noise performance.

The working principle of the 2N4901 is based on the injection of a current from the base into the collector. When a current is applied to the base, it injects a minority carrier (electrons, for NPN transistors) into the collector. The electrons, in turn, create a voltage drop across the collector and base, resulting in the amplification of the signal. The ratio between the Collector Current (Ic) and Base Current (Ib) is called the Current Gain (hFE) and is typically about 140 for the 2N4901. The output transistor also has a reverse leakage current, in which the collector current flows into the base when the voltage between the collector and the base exceeds a certain limit.

The 2N4901 is a popular bipolar transistor used in many high performance audio and video equipment applications. Its excellent noise immunity and high current handling capability make it suitable for many low noise amplifier and switching circuits. Its wide operating temperature range and variety of packages make it an ideal choice for a variety of applications.

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