Bipolar Transistors | NPN & PNP Transistors | RS
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    Bipolar Transistors

    Bipolar Transistors are a solid state, three-pin devices made from three layers of silicon. A bipolar transistor 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

    Bipolar transistors are constructed 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.

    How do bipolar transistors work?

    Bipolar transistors have 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.

    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.

    They are also available as;

    • Digital transistors - are made of a semiconductor material, usually silicon, which conducts the current (or electricity) with little resistance. They also tend to have at least three terminals for easy connection to an external circuit.
    • UJT transistors - constructed of a bar of lightly dope N type silicone with a small piece of heavily doped P type material attached to one side. Since the silicon bar is lightly dope it has very high resistance.

    Applications of bipolar transistors?

    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).

    5487 Products showing for Bipolar Transistors

    DiodesZetex
    NPN
    1 A
    80 V
    SOT-89
    Surface Mount
    1 W
    40
    Single
    100 V
    5 V
    150 MHz
    3
    1
    onsemi
    PNP
    -800 mA
    -45 V
    TO-92
    Through Hole
    625 mW
    -
    Single
    -
    5 V
    100 MHz
    3
    1
    STMicroelectronics
    NPN
    5 A
    400 V
    TO-220
    Through Hole
    80 W
    8
    Single
    800 V
    9 V
    -
    3
    1
    DiodesZetex
    NPN
    100 mA
    45 V
    SOT-323 (SC-70)
    Surface Mount
    200 mW
    200
    Single
    50 V
    6 V
    300 MHz
    3
    1
    Nexperia
    PNP
    -500 mA
    -80 V
    SOT-23 (TO-236AB)
    Surface Mount
    250 mW
    100
    Single
    80 V
    5 V
    -
    3
    1
    Nexperia
    NPN
    1 A
    60 V
    SOT-89
    Surface Mount
    1.35 W
    30
    Single
    70 V
    5 V
    100 MHz
    3
    1
    onsemi
    PNP
    -1.5 A
    -80 V
    TO-126
    Through Hole
    12.5 W
    -
    Single
    -80 V
    -5 V
    -
    3
    1
    onsemi
    -
    -
    390 (Breakdown) V
    TO-220
    Through Hole
    250 W
    -
    Single
    -
    -
    -
    3
    1
    DiodesZetex
    NPN
    1 A
    40 V
    SOT-23
    Surface Mount
    500 mW
    300
    Single
    40 V
    5 V
    150 MHz
    3
    1
    ROHM
    PNP
    100 mA
    -50 V
    EMT3
    Surface Mount
    -
    -
    -
    -
    -
    -
    3
    -
    onsemi
    PNP
    -4 A
    -100 V
    TO-225
    Through Hole
    15 W
    40
    Single
    100 V
    7 V
    10 MHz
    3
    1
    onsemi
    PNP
    -1.5 A
    -80 V
    SOT-223 (SC-73)
    Surface Mount
    1.5 W
    40, 63, 100
    Single
    -100 V
    -5 V
    35 MHz
    3 + Tab
    1
    Infineon
    NPN
    80 mA
    15 V
    TSFP-3-1
    Surface Mount
    -
    -
    -
    -
    -
    -
    -
    -
    onsemi
    PNP
    -17 A
    -250 V
    TO-264
    Through Hole
    150 W
    55, 80
    Single
    -250 V
    -5 V
    30 MHz
    3
    1
    ROHM
    NPN
    100 mA
    50 V
    SOT-323
    Surface Mount
    -
    -
    -
    -
    -
    -
    3
    1
    Nexperia
    NPN
    6 A
    100 V
    DPAK (TO-252)
    Surface Mount
    -
    30
    -
    -
    -
    -
    -
    1
    STMicroelectronics
    PNP
    -500 mA
    -300 V
    SOT-32
    Through Hole
    20.8 W
    30
    Single
    300 V
    3 V
    -
    3
    1
    onsemi
    NPN
    -
    100 V
    D2PAK (TO-263)
    Surface Mount
    80 W
    200
    Dual
    -
    5 V
    -
    2 + Tab
    2
    Taiwan Semiconductor
    NPN
    100 mA
    45 V
    SOT-23
    Surface Mount
    250 mW
    200
    Single
    50 V
    6 V
    100 MHz
    3
    1
    Taiwan Semiconductor
    NPN
    100 mA
    45 V
    TO-92
    Through Hole
    500 mW
    110
    Single
    50 V
    6 V
    -
    3
    1
    Resultater per side