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 803-1061
製造零件編號BC33725TFR
HK$1.309
/個 (每包:200個)
單位
NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
RS庫存編號 548-4431
製造零件編號2SC1623-A
HK$0.82
單位
NPN 100 mA 50 V MiniMold Surface Mount 200 mW - Single 60 V 5 V 250 MHz 3 1 -
RS庫存編號 761-3701
製造零件編號MPSA42
HK$2.071
/個 (每包:50個)
單位
NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS庫存編號 806-4504
製造零件編號KSC5027OTU
HK$7.027
/個 (每包:10個)
單位
NPN 3 A 800 V TO-220 Through Hole 50 W 8 Single 1100 V 7 V 1 MHz 3 1 -
RS庫存編號 739-0375
製造零件編號2N3906BU
HK$1.22
/個 (每包:10個)
單位
PNP 200 mA 40 V TO-92 Through Hole 625 mW 30 Single -40 V -5 V - 3 1 -
RS庫存編號 124-1357
製造零件編號MPSA42
HK$0.757
個 (以毎袋:1000)
單位
NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS庫存編號 169-8605
製造零件編號BC33725TFR
HK$0.333
個 (在毎卷:2000)
單位
NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
RS庫存編號 166-2167
製造零件編號KSC5027OTU
HK$4.787
毎管:50 個
單位
NPN 3 A 800 V TO-220 Through Hole 50 W 8 Single 1100 V 7 V 1 MHz 3 1 -
RS庫存編號 124-1348
製造零件編號BC557BTA
HK$0.303
個 (在毎卷:2000)
單位
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS庫存編號 805-1065
製造零件編號2N3906TFR
HK$0.734
/個 (每包:200個)
單位
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS庫存編號 177-5495
製造零件編號2N2222ACSM
BrandSemelab
HK$144.182
Each (In a Tray of 100)
單位
NPN 800 mA 40 V LCC 1 Surface Mount 500 mW 50 Single 75 V 6 V 250 MHz 3 1 -
RS庫存編號 124-1314
製造零件編號2N3906BU
HK$0.323
個 (以毎袋:1000)
單位
PNP 200 mA 40 V TO-92 Through Hole 625 mW 30 Single -40 V -5 V - 3 1 -
RS庫存編號 761-3505
製造零件編號BC557BTA
HK$0.477
/個 (每包:100個)
單位
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS庫存編號 805-1062
製造零件編號2N3906TF
HK$0.404
/個 (每包:200個)
單位
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS庫存編號 803-1068
製造零件編號BC33725TAR
HK$0.727
/個 (每包:200個)
單位
NPN 800 mA 50 V TO-92 Through Hole 625 mW 100 Single 10 V 5 V 50 MHz 3 1 -
RS庫存編號 671-1116
製造零件編號BC33725TA
HK$1.486
/個 (每包:10個)
單位
NPN 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -
RS庫存編號 178-7544
製造零件編號BC33725TAR
HK$0.439
個 (以毎袋:2000)
單位
- - - - - - - - - - - - - -
RS庫存編號 803-1138
製造零件編號BC557BTF
HK$0.446
/個 (每包:200個)
單位
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS庫存編號 169-8620
製造零件編號BC557BTF
HK$0.238
個 (在毎卷:2000)
單位
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS庫存編號 124-1731
製造零件編號BC33725TA
HK$0.329
個 (在毎卷:2000)
單位
NPN 800 mA 45 V TO-92 Through Hole 625 mW 100 Single - 5 V 100 MHz 3 1 -