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 314-1823
製造零件編號BD139
HK$9.95
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 168-6075
製造零件編號BD139
HK$2.59
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 168-6254
製造零件編號MJE350
HK$3.173
毎管:50 個
單位
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W 30 Single 300 V 3 V - 3 1 -
RS庫存編號 486-4577
製造零件編號MJE350
HK$5.038
/個 (每包:5個)
單位
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W 30 Single 300 V 3 V - 3 1 -
RS庫存編號 486-4561
製造零件編號MJE2955T
HK$5.76
/個 (每包:5個)
單位
PNP 10 A 60 V TO-220 Through Hole 75 W 5 Single 70 V 5 V 2 MHz 3 1 -
RS庫存編號 686-8045
製造零件編號2SD882
HK$5.603
/個 (每包:10個)
單位
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS庫存編號 102-4116
製造零件編號2SD882
HK$3.985
毎管:50 個
單位
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS庫存編號 168-6253
製造零件編號MJE2955T
HK$4.483
毎管:50 個
單位
PNP 10 A 60 V TO-220 Through Hole 75 W 5 Single 70 V 5 V 2 MHz 3 1 -
RS庫存編號 485-9115
製造零件編號D44H11
HK$7.096
/個 (每包:5個)
單位
NPN 20 A 80 V TO-220 Through Hole 50 W 40 Single 80 V 5 V - 3 1 -
RS庫存編號 795-8808
製造零件編號TIP29A
HK$4.313
/個 (每包:10個)
單位
NPN 1 A 60 V TO-220 Through Hole 30 W 15 Single 60 V 5 V - 3 1 -
RS庫存編號 168-6168
製造零件編號TIP3055
HK$8.453
毎管:30 個
單位
NPN 15 A 60 V TO-247 Through Hole 90 W 5 Single 100 V - 3 MHz 3 1 -
RS庫存編號 168-6136
製造零件編號D44H11
HK$5.122
毎管:50 個
單位
NPN 20 A 80 V TO-220 Through Hole 50 W 40 Single 80 V 5 V - 3 1 -
RS庫存編號 917-2741
製造零件編號STN9360
HK$5.63
/個 (每包:25個)
單位
PNP 500 mA 600 V SOT-223 Surface Mount 1.6 W 200 Single - -7 V - 3 + Tab 1 -
RS庫存編號 485-9749
製造零件編號TIP31A
HK$4.132
/個 (每包:5個)
單位
NPN 3 A 60 V TO-220 Through Hole 2 W 10 Single 60 V 5 V - 3 1 -
RS庫存編號 714-0997
製造零件編號MJE340
HK$3.473
/個 (每包:10個)
單位
NPN 500 mA 300 V SOT-32 Through Hole 2.8 W 30 Single 300 V 3 V - 3 1 -
RS庫存編號 168-6169
製造零件編號TIP31A
HK$3.208
毎管:50 個
單位
NPN 3 A 60 V TO-220 Through Hole 2 W 10 Single 60 V 5 V - 3 1 -
RS庫存編號 485-9727
製造零件編號TIP3055
HK$10.948
/個 (每包:5個)
單位
NPN 15 A 60 V TO-247 Through Hole 90 W 5 Single 100 V - 3 MHz 3 1 -
RS庫存編號 145-8939
製造零件編號STN9360
HK$2.101
個 (在毎卷:1000)
單位
PNP 500 mA 600 V SOT-223 Surface Mount 1.6 W 200 Single - -7 V - 3 + Tab 1 -
RS庫存編號 168-7288
製造零件編號TIP29A
HK$3.962
毎管:50 個
單位
NPN 1 A 60 V TO-220 Through Hole 30 W 15 Single 60 V 5 V - 3 1 -
RS庫存編號 168-6815
製造零件編號MJE340
HK$2.987
毎管:50 個
單位
NPN 500 mA 300 V SOT-32 Through Hole 2.8 W 30 Single 300 V 3 V - 3 1 -