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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Description Price 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
RS庫存編號 165-9789
製造零件編號BUJ100LR,412
HK$0.759
個 (在毎卷:5000)
單位
NPN 1 A 700 V TO-92 Through Hole 2.1 W 5 Single 700 V 9 V - 3 1 -
RS庫存編號 813-6700
製造零件編號BUJ100LR,412
HK$1.801
/個 (每包:50個)
單位
NPN 1 A 700 V TO-92 Through Hole 2.1 W 5 Single 700 V 9 V - 3 1 -
RS庫存編號 169-7275
製造零件編號PHE13009
HK$5.815
毎管:50 個
單位
NPN 12 A 700 V TO-220AB Through Hole 80 W 6 Single 700 V - 60 Hz 3 1 -
RS庫存編號 801-5662
製造零件編號PHE13009
HK$6.862
/個 (每包:5個)
單位
NPN 12 A 700 V TO-220AB Through Hole 80 W 6 Single 700 V - 60 Hz 3 1 -
RS庫存編號 166-0171
製造零件編號BUJ302AD
HK$3.641
個 (在毎卷:2500)
單位
NPN 4 A 400 V SOT-428 Surface Mount 80 W 25 Single - 24 V - 3 1 -
RS庫存編號 816-6779
製造零件編號PHE13005
HK$2.406
/個 (每包:50個)
單位
NPN 4 A 400 V TO-220AB Through Hole 75 W 10 Single 700 V 9 V 60 Hz 3 1 -
RS庫存編號 813-6719
製造零件編號BUJ302AD
HK$4.063
Each (On a Tape of 20)
單位
NPN 4 A 400 V SOT-428 Surface Mount 80 W 25 Single - 24 V - 3 1 -