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 145-3904
製造零件編號SMMBT2222ALT1G
TWD1.30
個 (在毎卷:3000)
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NPN 600 mA 40 V SOT-23 Surface Mount 225 mW 40 Single 75 V dc 6 V 100 MHz 3 1 AEC-Q101
RS庫存編號 544-9680
製造零件編號MJE15030G
TWD52.00
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 544-9646
製造零件編號MJ15024G
TWD245.00
單位
NPN 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -
RS庫存編號 122-0087
製造零件編號MJ15024G
TWD175.30
Each (In a Tray of 100)
單位
NPN 16 A 250 V TO-204 Through Hole 250 W 5 Single 400 V 5 V 4 MHz 3 1 -
RS庫存編號 792-5010
製造零件編號2SB1124T-TD-E
TWD16.20
Each (On a Tape of 25)
單位
PNP 3 A 50 V PCP Surface Mount 1.5 W 35 Single -60 V -6 V 150 MHz 3 1 -
RS庫存編號 166-2584
製造零件編號SS8050DBU
TWD1.40
個 (以毎袋:10000)
單位
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS庫存編號 169-8617
製造零件編號BC550CTA
TWD1.20
Each (On a Tape of 2000)
單位
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 5 V 1 MHz 3 1 -
RS庫存編號 464-221
製造零件編號2N4401G
TWD6.00
/個 (每包:200個)
單位
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 - 60 V 6 V 250 MHz 3 1 -
RS庫存編號 169-0600
製造零件編號ZXTP5401GTA
TWD6.00
個 (在毎卷:1000)
單位
PNP 600 mA 150 V SOT-223 Surface Mount 2 W 50 Single -160 V -5 V 100 MHz 3 + Tab 1 -
RS庫存編號 145-8821
製造零件編號SMBT2222AE6327HTSA1
BrandInfineon
TWD1.30
個 (在毎卷:3000)
單位
NPN 600 mA 40 V SOT-23 Surface Mount 330 mW 100 Single 75 V 6 V 300 (Min.) MHz 3 1 -
RS庫存編號 711-4957
製造零件編號ZXTP5401GTA
TWD12.60
/個 (每包:10個)
單位
PNP 600 mA 150 V SOT-223 Surface Mount 2 W 50 Single -160 V -5 V 100 MHz 3 + Tab 1 -
RS庫存編號 825-9294
製造零件編號SMBT2222AE6327HTSA1
BrandInfineon
TWD1.90
/個 (每包:200個)
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NPN 600 mA 40 V SOT-23 Surface Mount 330 mW 100 Single 75 V 6 V 300 (Min.) MHz 3 1 -
RS庫存編號 125-0072
製造零件編號MJE15030G
TWD43.80
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 168-6172
製造零件編號TIP47
TWD17.20
毎管:50 個
單位
NPN 1 A 250 V TO-220 Through Hole 2 W 10 Single 350 V 5 V 10 MHz 3 1 -
RS庫存編號 485-9856
製造零件編號TIP50
TWD28.00
/個 (每包:5個)
單位
NPN 1 A 400 V TO-220 Through Hole 2 W 10 Single 500 V 5 V 10 MHz 3 1 -
RS庫存編號 145-5537
製造零件編號SS8050DTA
TWD1.40
Each (On a Tape of 2000)
單位
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS庫存編號 168-6171
製造零件編號TIP41C
TWD18.50
毎管:50 個
單位
NPN 6 A 100 V TO-220 Through Hole 65 W 15 Single 100 V 5 V - 3 1 -
RS庫存編號 485-9834
製造零件編號TIP47
TWD20.60
/個 (每包:5個)
單位
NPN 1 A 250 V TO-220 Through Hole 2 W 10 Single 350 V 5 V 10 MHz 3 1 -
RS庫存編號 922-7633
製造零件編號ZXTP2029FTA
TWD11.70
個 (在毎卷:3000)
單位
PNP 3 A 100 V SOT-23 Surface Mount 1.56 W 40 Single 130 V 7 V 150 MHz 3 1 -
RS庫存編號 739-0375
製造零件編號2N3906BU
TWD5.00
/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 -