2N4250A

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	PNP
Voltage - Collector Emitter Breakdown (Max):	60V
Vce Saturation (Max) @ Ib, Ic:	250mV @ 500µA, 10mA
Current - Collector Cutoff (Max):	10nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	250 @ 100µA, 5V
Power - Max:	200mW
Frequency - Transition:	--
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-106-3 Domed
Supplier Device Package:	TO-106

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The 2N4250A is a two-terminal complementary epitaxial silicon NPN small signal transistor. It is a general-purpose amplifier, particularly suitable for high frequency applications. With its low collector-to-base capacitance, the 2N4250A is well suited for use in high frequency, low noise, low power amplifier applications. Its features include high gain, excellent stability, low output impedance and high immunity to noise.

2N4250A Application Field and Working Principle

The 2N4250A is a two-terminal complementary epitaxial silicon NPN small signal transistor. It is operating as a general-purpose amplifier and is suitable for high-frequency application. Its features include a high gain, excellent stability, low output impedance, and high noise immunity. This makes it ideal for low-power and high-frequency amplifier applications.The 2N4250A is part of the class of transistors known as bipolar junction transistors (BJT). BJT transistors consist of three layers of semiconductor material, the base, the collector, and the emitter. A BJT transistor is "polarized" meaning the current flow can be controlled by the application of an electrical voltage. When a voltage is applied to the base and emitter of the transistor, a current will flow from the collector to the emitter. This is known as the forward bias direction. When no voltage is applied, the transistor is said to be in its "on" state.When in the "on" or forward bias state, the transistor is in conduction, enabling current to flow. The current flow depends on the ratio between the base current and the collector current, known as the current gain of the transistor. The current gain is usually represented as "h" or "beta" and is a measure of the transistor\'s gains. The collector current is a direct result of the voltage applied to the base-emitter junction, and as such this current flow is a function of the properties of the transistor material. The gain of the transistor is usually determined by a number known as the "ratio of collector current to base current" (Rc/Rb).The 2N4250A has an Rc/Rb ratio of 10, indicating a gain of 10. This is the same for NPN transistors and PNP transistors since their properties are similar. This ratio determines the magnitude of the output from the transistor, and is proportional to the base current. The base current also has an effect on transistor properties such as the rise and fall times of the voltage signals, known as the switching or turn-on times. In addition to its high gain, the 2N4250A also has excellent stability. This is because it has low output impedance, which helps to reduce the voltage and current which is amplified. The low output impedance also helps to reduce the risk of instability of the amplifier, which is commonly caused by oscillations, which in turn can generate a distorted output signal. The 2N4250A also features high noise immunity, which helps to ensure that noise signals do not interfere with the amplified signal. This helps to make the 2N4250A an excellent choice for high-frequency applications, as the amplified signal will be free of noise. The low output impedance also helps to reduce the risk of disruption caused by noise.The 2N4250A is a versatile transistor and can be used in a range of applications. Its high gain, excellent stability, low output impedance and high noise immunity make it ideal for low power and high frequency applications. It is also suitable for use in amplifiers, digital to analog converters and other electronic circuits.

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