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 803-1074
製造零件編號BC546ABU
HK$0.496
/個 (每包:200個)
單位
NPN 100 mA 65 V TO-92 Through Hole 500 mW 110 Single 80 V 6 V 1 MHz 3 1 -
RS庫存編號 922-8389
製造零件編號DSS20200L-7
HK$0.864
個 (在毎卷:3000)
單位
PNP 2 A 20 V SOT-23 Surface Mount 600 mW 150 Single -20 V -7 V 100 MHz 3 1 -
RS庫存編號 163-2357
製造零件編號BC858CLT3G
HK$0.124
個 (在毎卷:10000)
單位
PNP 100 mA 30 V SOT-23 Surface Mount 300 mW 420 Single 30 V 5 V 100 MHz 3 1 -
RS庫存編號 711-4875
製造零件編號MMBT2907A-7-F
HK$0.377
/個 (每包:100個)
單位
PNP 600 mA 60 V SOT-23 Surface Mount 300 mW 50 Single -60 V -5 V - 3 1 -
RS庫存編號 169-0801
製造零件編號DSS4160T-7
HK$0.733
個 (在毎卷:3000)
單位
NPN 1 A 60 V SOT-23 Surface Mount 725 mW 100 Single 80 V 5 V - 3 1 -
RS庫存編號 168-3657
製造零件編號DSC7Q01Q0L
BrandPanasonic
HK$2.934
個 (在毎卷:1000)
單位
NPN 1 A 80 V MiniP3 F2 B Surface Mount 1 W 4000 Single 100 V 5 V - 3 2 -
RS庫存編號 759-9204
製造零件編號FFB2227A
HK$1.176
/個 (每包:50個)
單位
NPN + PNP 500 mA 30 V SOT-363 (SC-70) Surface Mount 300 mW 100 Isolated 60 V 5 V 100 MHz 6 2 -
RS庫存編號 822-2659
製造零件編號DPLS160-7
HK$0.961
/個 (每包:100個)
單位
PNP 1 A 60 V SOT-23 Surface Mount 300 mW 200 Single -80 V -5 V 220 MHz 3 1 -
全新
RS庫存編號 186-4262
製造零件編號2SAR372P5T100Q
BrandROHM
HK$1.467
個 (在毎卷:1000)
單位
PNP 1.4 A -120 V SOT-89 Surface Mount 2 W 120 Single -120 V -6 V 100 MHz 3 1 -
RS庫存編號 166-0137
製造零件編號PMBTA44,215
BrandNexperia
HK$1.413
個 (在毎卷:3000)
單位
NPN 200 mA 400 V SOT-23 Surface Mount 250 mW 40 Single 500 V 6 V 100 MHz 3 1 -
RS庫存編號 166-2906
製造零件編號KSP06TA
HK$0.414
Each (On a Tape of 2000)
單位
NPN 500 mA 80 V TO-92 Through Hole 625 mW 50 Single 80 V 4 V 100 MHz 3 1 -
RS庫存編號 165-8805
製造零件編號BC858C-7-F
HK$0.126
個 (在毎卷:3000)
單位
PNP 100 mA 30 V SOT-23 Surface Mount 350 mW 330, 600 Single -30 V -5 V 100 MHz 3 1 -
RS庫存編號 166-1625
製造零件編號NZT753
HK$2.05
個 (在毎卷:4000)
單位
PNP 4 A 100 V SOT-223 Surface Mount 1.2 W 100 Single -120 V -5 V 100 MHz 3 + Tab 1 -
RS庫存編號 168-3479
製造零件編號DSC7003S0L
BrandPanasonic
HK$1.71
個 (在毎卷:1000)
單位
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W 170 Single 60 V 5 V 170 MHz 3 1 -
RS庫存編號 151-3388
製造零件編號2PD602ASL,215
BrandNexperia
HK$0.287
個 (在毎卷:3000)
單位
NPN 500 mA 50 V SOT23, TO-236AB Surface Mount 250 mW 40 Single 60 V 5 V 180 (Min) MHz 3 1 AEC-Q101
RS庫存編號 168-9655
製造零件編號ZTX558
HK$2.20
個 (以毎袋:4000)
單位
PNP 200 mA 400 V E-Line Through Hole 1 W 15 Single 400 V 5 V 50 MHz 3 1 -
RS庫存編號 761-3509
製造零件編號BC846CMTF
HK$0.433
/個 (每包:100個)
單位
NPN 100 mA 65 V SOT-23 Surface Mount 310 mW 110 Single 80 V 6 V 300 MHz 3 1 -
RS庫存編號 166-0634
製造零件編號BCP55-16,115
BrandNexperia
HK$0.581
個 (在毎卷:3000)
單位
NPN 1 A 60 V SOT-223 (SC-73) Surface Mount 960 mW 100 Single 60 V 5 V 180 MHz 4 1 -
RS庫存編號 178-7034
製造零件編號BCP55-10,115
BrandNexperia
HK$0.763
個 (在毎卷:1000)
單位
NPN 1 A 60 V SOT-223 (SC-73) Surface Mount 960 mW 63 Single 60 V 5 V 180 MHz 4 1 -
RS庫存編號 805-1100
製造零件編號2N5551BU
HK$0.508
/個 (每包:200個)
單位
NPN 600 mA 160 V TO-92 Through Hole 625 mW 80 Single 180 V 6 V 100 MHz 3 1 -