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 145-3422
製造零件編號BC857CDW1T1G
HK$0.252
個 (在毎卷:3000)
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PNP 100 mA 45 V SOT-363 (SC-88) Surface Mount 380 mW 270 Single -50 V -5 V 100 MHz 6 1 -
RS庫存編號 145-5587
製造零件編號KSC2223YMTF
HK$0.317
個 (在毎卷:3000)
單位
NPN 20 mA 20 V SOT-23 Surface Mount 150 mW 40 Single 30 V 4 V 100 MHz 3 1 -
RS庫存編號 178-5050
製造零件編號2STN1360
HK$1.576
個 (在毎卷:1000)
單位
- - - - - - - - - - - - - -
RS庫存編號 711-5752
製造零件編號DSC7102S0L
BrandPanasonic
HK$5.978
/個 (每包:10個)
單位
NPN 1 A 80 V MiniP3 F2 B Surface Mount 1 W 170 Single 80 V 5 V 180 MHz 3 1 -
RS庫存編號 145-3943
製造零件編號2SA1416S-TD-E
HK$1.39
個 (在毎卷:1000)
單位
PNP 1 A 100 V SOT-89 Surface Mount 1.3 W 100 Single -120 V -6 V 1 MHz 3 1 -
RS庫存編號 669-7653
製造零件編號BCX6825TA
HK$2.918
/個 (每包:25個)
單位
NPN 1 A 20 V SOT-89 Surface Mount 1 W 160 Single 25 V 5 V 100 MHz 3 1 -
RS庫存編號 711-5184
製造零件編號ZXTP25100BFHTA
HK$4.099
/個 (每包:10個)
單位
PNP 2 A 100 V SOT-23 Surface Mount 1.81 W 15 Single -140 V -7 V 200 MHz 3 1 -
RS庫存編號 770-3428
製造零件編號DSS4140U-7
HK$2.544
/個 (每包:50個)
單位
NPN 1 A 40 V SOT-323 (SC-70) Surface Mount 400 mW 200 Single 40 V 5 V - 3 1 -
RS庫存編號 816-7791
製造零件編號BF621
BrandNexperia
HK$2.72
/個 (每包:20個)
單位
PNP 50 mA 300 V SOT-89 Surface Mount 1.1 W 50 Single -300 V -5 V 100 MHz 3 1 -
RS庫存編號 124-1394
製造零件編號KSC1815YTA
HK$0.268
個 (在毎卷:2000)
單位
NPN 150 mA 50 V TO-92 Through Hole 400 mW 25 Single 60 V 5 V 1 MHz 3 1 -
RS庫存編號 485-391
製造零件編號PBSS4160DS,115
BrandNexperia
HK$1.898
/個 (每包:20個)
單位
NPN 1 A 60 V TSOP Surface Mount 700 mW 100 Isolated 80 V 5 V 220 MHz 6 2 -
RS庫存編號 145-4777
製造零件編號50A02CH-TL-E
HK$0.804
個 (在毎卷:3000)
單位
PNP 500 mA 50 V CPH Surface Mount 700 mW 200 Single -50 V -5 V 690 MHz 3 1 -
RS庫存編號 711-5055
製造零件編號ZXTP2041FTA
HK$2.46
/個 (每包:20個)
單位
PNP 1 A 40 V SOT-23 Surface Mount 350 mW 30 Single -40 V -5 V 300 MHz 3 1 -
RS庫存編號 806-4471
製造零件編號KSC1815YTA
HK$0.487
/個 (每包:200個)
單位
NPN 150 mA 50 V TO-92 Through Hole 400 mW 25 Single 60 V 5 V 1 MHz 3 1 -
RS庫存編號 320-8207
製造零件編號2SC4061KT146N/P
BrandROHM
HK$1.299
/個 (每包:10個)
單位
NPN 100 mA 300 V SOT-346 (SC-59) Surface Mount 200 mW 56 Single 300 V 5 V 100 MHz 3 1 -
RS庫存編號 756-0297
製造零件編號2SC5976(TE85L,F)
BrandToshiba
HK$1.945
/個 (每包:10個)
單位
NPN 3 A 30 V TSM Surface Mount 1 W 120 Single 50 V 6 V - 3 1 -
RS庫存編號 162-9439
製造零件編號MJW21194G
HK$31.32
毎管:30 個
單位
NPN 16 A 250 V TO-247 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS庫存編號 166-0459
製造零件編號MMST3906-7-F
HK$0.342
個 (在毎卷:3000)
單位
PNP 200 mA 40 V SOT-323 (SC-70) Surface Mount 200 mW 30 Single -40 V -5 V - 3 1 -
RS庫存編號 124-1315
製造零件編號KSP2222ABU
HK$0.432
個 (以毎袋:1000)
單位
NPN 600 mA 40 V TO-92 Through Hole 625 mW 40 Single 75 V 6 V - 3 1 -
RS庫存編號 475-9778
製造零件編號2SC2412KT146R
BrandROHM
HK$0.471
/個 (每包:100個)
單位
NPN 150 mA 50 V SMT Surface Mount 200 mW 180 Single 60 V 7 V 180 MHz 3 1 -