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 545-0343
製造零件編號MMBT3904LT1G
TWD3.50
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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 170-3540
製造零件編號MMBT3904LT3G
TWD0.40
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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 103-2948
製造零件編號MMBT3904LT1G
TWD0.50
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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 793-0753
製造零件編號MMBT3904LT3G
TWD1.30
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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 169-8613
製造零件編號BC549BTA
TWD1.00
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NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 5 V 1 MHz 3 1 -
RS庫存編號 803-1119
製造零件編號BC549BTF
TWD1.40
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NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 5 V 1 MHz 3 1 -
RS庫存編號 803-1100
製造零件編號BC549BTA
TWD1.50
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NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 5 V 1 MHz 3 1 -
RS庫存編號 166-3111
製造零件編號BC549BTF
TWD1.00
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NPN 100 mA 30 V TO-92 Through Hole 500 mW 110 Single 30 V 5 V 1 MHz 3 1 -
RS庫存編號 739-0303
製造零件編號MMBT3904
TWD5.60
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NPN 200 mA 40 V SOT-23 Surface Mount 350 mW 30 Single 60 V 6 V - 3 1 -
RS庫存編號 792-4956
製造零件編號15C01M-TL-E
TWD6.60
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NPN 700 mA 15 V MCP Surface Mount 300 mW 300 Single 20 V 5 V 330 MHz 3 1 -
RS庫存編號 145-4769
製造零件編號15C01M-TL-E
TWD1.60
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NPN 700 mA 15 V MCP Surface Mount 300 mW 300 Single 20 V 5 V 330 MHz 3 1 -
RS庫存編號 826-8342
製造零件編號2SA2094TLQ
BrandROHM
TWD11.00
/個 (每包:30個)
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PNP 2 A 60 V SOT-346T (SC-96) Surface Mount 500 mW 120 Single -60 V -6 V 100 MHz 3 1 -
RS庫存編號 686-8045
製造零件編號2SD882
TWD19.50
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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 922-7800
製造零件編號FZT851TA
TWD11.80
個 (在毎卷:1000)
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NPN 6 A 60 V SOT-223 Surface Mount 3 W - Single 150 V 6 V - 3 + Tab 1 -
RS庫存編號 169-4139
製造零件編號FZT851TA
TWD31.00
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NPN 6 A 60 V SOT-223 Surface Mount 3 W - Single 150 V 6 V - 3 + Tab 1 -
RS庫存編號 102-4116
製造零件編號2SD882
TWD8.00
毎管:50 個
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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 738-4891
製造零件編號BC817-40-7-F
TWD1.50
/個 (每包:100個)
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NPN 500 mA 45 V SOT-23 Surface Mount 310 mW 170 Single - 5 V - 3 1 -
RS庫存編號 890-2682
製造零件編號2SC5200-O(S1,F,S)
BrandToshiba
TWD78.40
/個 (每包:5個)
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NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V - 3 1 -
RS庫存編號 165-8768
製造零件編號BC56PA
BrandNexperia
TWD3.00
個 (在毎卷:3000)
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NPN 1 A 80 V SOT-1061 Surface Mount 1.65 W 40 Single 100 V 5 V 100 MHz 3 1 -
RS庫存編號 808-0467
製造零件編號SS9014ABU
TWD1.80
/個 (每包:200個)
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NPN 100 mA 45 V TO-92 Through Hole 450 mW 60 Single 50 V 5 V 1 MHz 3 1 -