BJT & Bipolar Transistors

A Bipolar Transistor or BJT (Bipolar Junction Transistor) is a solid state, three-pin device made from three layers of silicon. A BJT is designed to amplify current, bipolar transistors can also function as a switch. There are two main types of transistor, PNP (positive negative positive) or NPN (negative positive negative).
How a Bipolar transistor is made
A bipolar transistor is made by joining two signal diodes back to back creating two PN junctions connected in series, sharing a common P or N terminal. By nature, silicon does not normally conduct electricity well. However, when silicon is treated with certain chemicals or impurities we can make the material and electrons behave in a different way. This process is called doping. The doping process improves the semiconductors ability to conduct electricity.
What does a bipolar transistor do?
As we said before a bipolar transistor has two possible functions, switching, and amplification. Due to the devices three layers of doped semiconductor material, supplying the transistor with a signal voltage enables the discrete component to act as an insulator or a conductor. This clever change provides the transistors with two basic functions, switching (digital) electronics or amplification (analog) electronics.
Types of transistor
Transistors are available in panel, surface and through hole mounting options in plastic package or metal can versions. All have three terminals or pins, the Base, the Collector, and the Emitter.
Where are bipolar transistors used?
Transistors are one of the most widely used discrete components in electronic designs and circuits. Transistors are used for the amplification of all types of electrical signals in circuits made up of individual components rather than ICs (integrated circuits).

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제품설명 단가 Transistor Type Maximum DC Collector Current Maximum Collector Emitter Voltage Package Type Mounting Type Maximum Power Dissipation Minimum DC Current Gain Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Automotive Standard
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NPN 3 A 800 V TO-220 Through Hole 50 W 8 Single 1100 V 7 V 1 MHz 3 1 -
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₩54.25
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PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
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₩94.55
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NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
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₩49.60
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₩86.80
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PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS 제품 번호 169-8605
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NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
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₩82.15
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PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS 제품 번호 177-5495
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₩54.25
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PNP 200 mA 40 V TO-92 Through Hole 625 mW 30 Single -40 V -5 V - 3 1 -
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제조사 부품 번호2N2222ACSM
제조사Semelab
₩19,644.70
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NPN 800 mA 40 V LCC 1 Surface Mount 500 mW 50 Single 75 V 6 V 250 MHz 3 1 -
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₩65.10
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NPN 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
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₩44.95
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PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
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₩133.30
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NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
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NPN 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
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제조사 부품 번호2N3906TAR
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₩41.85
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PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
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제조사 부품 번호MPSA42
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₩403.00
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NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
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₩127.10
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NPN 100 mA 50 V MiniMold Surface Mount 200 mW - Single 60 V 5 V 250 MHz 3 1 -