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 184-868
製造零件編號2SC5198-O(Q)
BrandToshiba
HK$16.18
單位
NPN 10 A 140 V TO-3PN Through Hole 100 W 80 Single 140 V 5 V 30 MHz 3 1 -
RS庫存編號 544-9680
製造零件編號MJE15030G
HK$11.84
單位
NPN 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS庫存編號 125-0072
製造零件編號MJE15030G
HK$12.175
毎管:50 個
單位
NPN 8 A 150 V TO-220AB Through Hole 50 W 20 Single 150 V 5 V 30 MHz 3 1 -
RS庫存編號 314-1823
製造零件編號BD139
HK$3.89
單位
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS庫存編號 170-3540
製造零件編號MMBT3904LT3G
HK$0.125
個 (在毎卷:10000)
單位
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW 30 Single 60 V dc 6 V 100 MHz 3 1 -
RS庫存編號 124-1317
製造零件編號2N3904TA
HK$0.293
個 (在毎卷:2000)
單位
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS庫存編號 842-8015
製造零件編號2N3904BU
HK$0.304
個 (以毎袋:1000)
單位
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS庫存編號 545-0343
製造零件編號MMBT3904LT1G
HK$0.905
/個 (每包:50個)
單位
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW 40 Single 60 V 6 V 300 MHz 3 1 -
RS庫存編號 168-6075
製造零件編號BD139
HK$3.846
毎管:50 個
單位
NPN 3 A 80 V SOT-32 Through Hole 1.25 W 25 Single 80 V 5 V - 3 1 -
RS庫存編號 761-3511
製造零件編號BD13916STU
HK$3.397
/個 (每包:10個)
單位
NPN 1.5 A 80 V TO-126 Through Hole 12.5 W 40 Single 80 V 5 V - 3 1 -
RS庫存編號 739-0442
製造零件編號2N3904TA
HK$1.467
/個 (每包:10個)
單位
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS庫存編號 806-2750
製造零件編號KSC3503DSTU
HK$3.185
毎管:60 個
單位
NPN 100 mA 300 V TO-126 Through Hole 7 W 40 Single 300 V 5 V 1 MHz 3 1 -
RS庫存編號 843-1575
製造零件編號2N3904BU
HK$1.077
/個 (每包:50個)
單位
NPN 200 mA 40 V TO-92 Through Hole 625 mW 100 Single 60 V 6 V 100 MHz 3 1 -
RS庫存編號 805-1043
製造零件編號2N3904TAR
HK$0.521
/個 (每包:200個)
單位
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS庫存編號 793-0753
製造零件編號MMBT3904LT3G
HK$0.434
/個 (每包:200個)
單位
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW 30 Single 60 V dc 6 V 100 MHz 3 1 -
RS庫存編號 805-1056
製造零件編號2N3904TFR
HK$0.528
/個 (每包:200個)
單位
NPN 200 mA 40 V TO-92 Through Hole 625 mW 30 Single 60 V 6 V 300 MHz 3 1 -
RS庫存編號 103-2948
製造零件編號MMBT3904LT1G
HK$0.149
個 (在毎卷:3000)
單位
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW 40 Single 60 V 6 V 300 MHz 3 1 -
RS庫存編號 145-4345
製造零件編號BD13916STU
HK$1.21
毎管:60 個
單位
NPN 1.5 A 80 V TO-126 Through Hole 12.5 W 40 Single 80 V 5 V - 3 1 -
RS庫存編號 146-2331
製造零件編號BC338-25 A1
HK$0.304
Each (On a Tape of 4000)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 160 Single 30 V 5 V - 3 1 -
RS庫存編號 796-9684
製造零件編號BC338-25 A1
HK$0.324
/個 (每包:250個)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 160 Single 30 V 5 V - 3 1 -