The BC107 is a small single NPN Transistor available in TO-18 metal can package. These transistors are age old and have been used in low noise and low signal designs.
The MPSA13 is an NPN Darlington Transistor with a high DC Gain of 5000 and a high Transition Frequency of 125MHz making it suitable for amplifier designs.
The MPSA06 is an 80V 500mA general purpose NPN transistor with a maximum gain value of 100. This makes the transistor suitable for amplifier applications.
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The MPSA18 is a General Purpose NPN Transistor which can operate with low noise and high gain. The transistor has a gain value of 500 to 1500 and can operate at a voltage of 45V with 200mA load current.
The KST42 is a SMD package NPN Transistor that has high collector emitter voltage of 300V and a collector current of 500mA. The transistor is a general purpose transistor and can be used for both switching and amplification purpose.
The NTE123AP is a NPN Transistor with collector current of 600mA and Base voltage of 6V. It has a gain value of 100 to 300 and hence can be used in low power audio circuits.
The 2N3771 is a high current switching transistor that has a collector current of 30A. It is commonly used in Linear switching devices and power supply circuits.
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The 2SC2879 is a 45V 25A NPN Transistor that is commonly used for linear power amplifier applications. It is designed to operate between 2-30 MHz at a voltage of 12.5V.
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The 2SC5200 is a high power NPN Transistor with a collector to emitter voltage of 230V and collector current of 30A. The transistor is available in TO-264 package and is commonly used Amplifier designs.