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 548-4431
製造零件編號2SC1623-A
HK$0.82
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NPN 100 mA 50 V MiniMold Surface Mount 200 mW - Single 60 V 5 V 250 MHz 3 1 -
RS庫存編號 772-4992
製造零件編號2SC3360-T1B-A
HK$1.283
/個 (每包:40個)
單位
NPN 100 mA 200 V SOT-346 (SC-59) Surface Mount 200 mW 90 Single 200 V 5 V - 3 1 -
RS庫存編號 121-6876
製造零件編號2SA1615-Z-E1-AZ
HK$8.478
/個 (每包:4個)
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PNP 10 A 20 V DPAK (TO-252) Surface Mount 15 W 160 Single -30 V -10 V - 3 1 -
RS庫存編號 772-5141
製造零件編號2SD780-T1B-A
HK$1.54
/個 (每包:40個)
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NPN 300 mA 60 V SOT-346 (SC-59) Surface Mount 200 mW 110 Single 60 V 5 V - 3 1 -
RS庫存編號 923-1335
製造零件編號HFA3127BZ
HK$50.847
毎管:48 個
單位
NPN 65 mA 8 V SOIC Surface Mount 150 mW 40 Isolated 12 V 5.5 V 8000 MHz 16 5 -
RS庫存編號 772-5074
製造零件編號2SC5336-T1-AZ
HK$4.21
/個 (每包:10個)
單位
NPN 100 mA 12 V Power Mini-Mold Surface Mount 1.2 W 50 Single 20 V 3 V - 4 1 -
RS庫存編號 121-6878
製造零件編號2SD1584-Z-E1-AZ
HK$14.86
/個 (每包:4個)
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NPN 3 A 60 V DPAK (TO-252) Surface Mount 2 W 500 Single 60 V 7 V - 3 1 -
RS庫存編號 921-5942
製造零件編號HFA3096BZ
HK$51.39
單位
NPN + PNP 65 mA 8 V SOIC Surface Mount 150 mW 20 Isolated 12 V 5.5 V 5500 (PNP) MHz, 8000 (NPN) MHz 16 5 -
RS庫存編號 921-5683
製造零件編號HFA3101BZ
HK$68.83
單位
NPN 30 mA 8 V SOIC Surface Mount - 40 Complex 12 V 5.5 V 10000 MHz 8 6 -
RS庫存編號 921-5428
製造零件編號HFA3127BZ
HK$76.60
單位
NPN 65 mA 8 V SOIC Surface Mount 150 mW 40 Isolated 12 V 5.5 V 8000 MHz 16 5 -
RS庫存編號 772-5034
製造零件編號2SC4550-AZ
HK$10.294
/個 (每包:5個)
單位
NPN 7 A 60 V MP-45F Through Hole 30 W 100 Single 100 V 7 V - 3 1 -
RS庫存編號 772-6636
製造零件編號UPA671T-T1-A
HK$1.54
個 (在毎卷:40)
單位
PNP 100 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW - Isolated - - - 6 2 -
RS庫存編號 496-745
製造零件編號HFA3127BZ
HK$78.28
單位
NPN 65 mA 8 V SOIC Surface Mount 150 mW 40 Isolated 12 V 5.5 V 8000 MHz 16 5 -
RS庫存編號 548-4425
製造零件編號2SA812-A
HK$2.80
單位
PNP 100 mA 50 V MiniMold Surface Mount 200 mW - Single 60 V 5 V 180 MHz 3 1 -
RS庫存編號 772-6627
製造零件編號UPA670T-T1-A
HK$1.503
個 (在毎卷:40)
單位
PNP 100 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW - Isolated - - - 6 2 -
RS庫存編號 772-4977
製造零件編號2SB806-T1-AZ
HK$2.925
/個 (每包:20個)
單位
PNP 700 mA 120 V SC-62 Surface Mount 2 W 90 Single -120 V -5 V - 3 1 -
RS庫存編號 772-4983
製造零件編號2SC2223-T1B-A
HK$1.55
/個 (每包:40個)
單位
NPN 20 mA 20 V SOT-346 (SC-59) Surface Mount 150 mW 40 Single 30 V 4 V - 3 1 -
RS庫存編號 121-6877
製造零件編號2SB1261(0)-Z-E1-AZ
HK$9.426
/個 (每包:10個)
單位
PNP 3 A 60 V DPAK (TO-252) Surface Mount 10 W 50 Single -60 V -7 V - 3 1 -
RS庫存編號 772-4974
製造零件編號2SC1622A-T1B-A
HK$1.54
/個 (每包:40個)
單位
NPN 50 mA 120 V SOT-346 (SC-59) Surface Mount 200 mW 135 Single 120 V 5 V - 3 1 -
RS庫存編號 146-2424
製造零件編號HFA3096BZ
HK$38.444
毎管:48 個
單位
NPN + PNP 65 mA 8 V SOIC Surface Mount 150 mW 20 Isolated 12 V 5.5 V 5500 (PNP) MHz, 8000 (NPN) MHz 16 5 -