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 484-5065
製造零件編號BC847C,215
BrandNexperia
HK$0.746
/個 (每包:50個)
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NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 420 Single 50 V 6 V 100 MHz 3 1 -
RS庫存編號 663-8412
製造零件編號CPH3115-TL-E
BrandSanyo
HK$2.83
/個 (每包:5個)
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PNP 1.5 A -30 V CPH Surface Mount 900 mW 200 - -30 V -5 V 450 MHz 3 1 -
RS庫存編號 545-2787
製造零件編號BCX19LT1G
HK$559.54
毎卷:3000 個
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NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 70 Single 50 V 5 V - 3 1 -
RS庫存編號 801-0014
製造零件編號CPH6539-TL-H
HK$1.575
/個 (每包:25個)
單位
NPN 1.5 A 30 V CPH Surface Mount 1.2 W 200 Isolated 40 V 5 V 500 MHz 6 2 -
RS庫存編號 169-7457
製造零件編號MMST2222A-7-F
HK$0.389
個 (在毎卷:3000)
單位
NPN 600 mA 40 V SOT-323 (SC-70) Surface Mount 200 mW 300 Single 75 V 6 V 300 MHz 3 1 -
RS庫存編號 166-1314
製造零件編號BCW32,215
BrandNexperia
HK$0.221
個 (在毎卷:3000)
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NPN 100 mA 32 V SOT-23 (TO-236AB) Surface Mount 250 mW 200 Single 32 V 5 V 100 MHz 3 1 -
RS庫存編號 790-5450
製造零件編號NJW0281G
HK$18.915
/個 (每包:2個)
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NPN 15 A 250 V TO-3P Through Hole 150 W 75 Single 250 V dc 5 V 1 MHz 3 1 -
RS庫存編號 168-6167
製造零件編號TIP29C
HK$3.397
毎管:50 個
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NPN 1 A 100 V TO-220 Through Hole 2 W 15 Single 100 V 5 V - 3 1 -
RS庫存編號 545-0416
製造零件編號MMBTA06LT1G
HK$1.318
/個 (每包:50個)
單位
NPN 500 mA 80 V SOT-23 Surface Mount 300 mW 100 Single 80 V 4 V 100 MHz 3 1 -
RS庫存編號 711-5008
製造零件編號MMDT2907A-7-F
HK$1.90
/個 (每包:20個)
單位
PNP 600 mA 60 V SOT-363 (SC-88) Surface Mount 200 mW 50 Isolated -60 V -5 V - 6 2 -
RS庫存編號 796-9688
製造零件編號BC338-40 A1
HK$0.293
/個 (每包:250個)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 250 Single 30 V 5 V - 3 1 -
RS庫存編號 103-2931
製造零件編號BC846BLT1G
HK$0.158
個 (在毎卷:3000)
單位
NPN 100 mA 65 V SOT-23 Surface Mount 300 mW 200 Single 80 V 6 V 100 MHz 3 1 -
RS庫存編號 792-0872
製造零件編號BLT81,115
BrandNXP
HK$15.165
個 (在毎卷:2)
單位
NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W 25 Single 20 V 2.5 V 900 MHz 3 + Tab 1 -
RS庫存編號 170-8038
製造零件編號BCX51-16,135
BrandNexperia
HK$0.786
個 (在毎卷:4000)
單位
PNP 1 A -45 V SOT-89 Surface Mount 1.35 W 100 Single -45 V -5 V 145 MHz 3 + Tab 1 AEC-Q101
RS庫存編號 179-1081
製造零件編號MMBT3906,215
BrandNexperia
HK$0.148
個 (在毎卷:3000)
單位
PNP 200 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW 30 Single 40 V 6 V - 3 1 -
RS庫存編號 890-2614
製造零件編號2SA1587-GR(TE85L,F
BrandToshiba
HK$2.013
/個 (每包:25個)
單位
PNP 100 mA 120 V SOT-323 (SC-70) Surface Mount 100 mW 200 Single -120 V -5 V - 3 1 -
RS庫存編號 484-2375
製造零件編號BCX51-16,115
BrandNexperia
HK$2.06
/個 (每包:25個)
單位
PNP 1 A 45 V UPAK Surface Mount 1.3 W 100 Single 45 V 5 V 145 MHz 4 1 -
RS庫存編號 725-8574
製造零件編號PXT2907A,115
BrandNexperia
HK$2.698
/個 (每包:10個)
單位
PNP 600 mA 60 V SOT-89 Surface Mount 1.1 W 50 Single -60 V -5 V - 3 1 -
RS庫存編號 125-0064
製造零件編號MJ14002G
HK$83.767
Each (In a Tray of 100)
單位
NPN 60 A 80 V TO-204 Through Hole 300 W 5 Single 80 V 5 V - 2 1 -
RS庫存編號 170-8034
製造零件編號BCX19,235
BrandNexperia
HK$0.385
個 (在毎卷:10000)
單位
NPN 500 mA 45 V SOT-23 Surface Mount 250 mW 40 Single 50 V 5 V - 3 1 AEC-Q101