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 Stock No. 707-4301
Mfr. Part No.DSC7003S0L
BrandPanasonic
HK$3.65
Each (In a Pack of 10)
units
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W 170 Single 60 V 5 V 170 MHz 3 1 -
RS Stock No. 168-3478
Mfr. Part No.DSC700300L
BrandPanasonic
HK$1.71
Each (On a Reel of 1000)
units
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W 120 Single 60 V 5 V 170 MHz 3 1 -
RS Stock No. 707-4291
Mfr. Part No.DSC700300L
BrandPanasonic
HK$3.65
Each (In a Pack of 10)
units
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W 120 Single 60 V 5 V 170 MHz 3 1 -
RS Stock No. 168-3364
Mfr. Part No.DSC200100L
BrandPanasonic
HK$0.445
Each (On a Reel of 3000)
units
NPN 100 mA 50 V Mini3 G3 B Surface Mount 200 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 168-3471
Mfr. Part No.DSA5001S0L
BrandPanasonic
HK$0.531
Each (On a Reel of 3000)
units
PNP 100 mA 50 V SMini3 F2 B Surface Mount 150 mW 290 Single -60 V -7 V 150 MHz 3 1 -
RS Stock No. 168-3731
Mfr. Part No.DMG204B00R
BrandPanasonic
HK$1.756
Each (On a Reel of 3000)
units
NPN + PNP 500 mA 10 V, 50 V Mini6 G4 B Surface Mount 300 mW 210 Isolated -15 V, 60 V -7 (PNP) V, 7 (NPN) V 150 (NPN) MHz, 250 (PNP) MHz 6 2 -
RS Stock No. 168-3652
Mfr. Part No.DSC7102S0L
BrandPanasonic
HK$4.283
Each (On a Reel of 1000)
units
NPN 1 A 80 V MiniP3 F2 B Surface Mount 1 W 170 Single 80 V 5 V 180 MHz 3 1 -
RS Stock No. 707-4317
Mfr. Part No.DSC900100L
BrandPanasonic
HK$2.678
Each (In a Pack of 50)
units
NPN 100 mA 50 V SSMini3 F3 B Surface Mount 125 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 168-3699
Mfr. Part No.DMG204010R
BrandPanasonic
HK$1.39
Each (On a Reel of 3000)
units
NPN + PNP 100 mA 50 V Mini6 G4 B Surface Mount 300 mW 210 (NPN), 210 (PNP) Isolated - -7 (PNP) V, 7 (NPN) V - 6 2 -
RS Stock No. 707-4253
Mfr. Part No.DSA5001S0L
BrandPanasonic
HK$2.225
Each (In a Pack of 25)
units
PNP 100 mA 50 V SMini3 F2 B Surface Mount 150 mW 290 Single -60 V -7 V 150 MHz 3 1 -
RS Stock No. 168-3657
Mfr. Part No.DSC7Q01Q0L
BrandPanasonic
HK$3.26
Each (On a Reel of 1000)
units
NPN 1 A 80 V MiniP3 F2 B Surface Mount 1 W 4000 Single 100 V 5 V - 3 2 -
RS Stock No. 711-5758
Mfr. Part No.DSC7102R0L
BrandPanasonic
HK$6.47
Each (In a Pack of 10)
units
NPN 1 A 80 V MiniP3 F2 B Surface Mount 1 W 120 Single 80 V 5 V 180 MHz 3 1 -
RS Stock No. 168-3653
Mfr. Part No.DSC7101S0L
BrandPanasonic
HK$1.90
Each (On a Reel of 1000)
units
NPN 500 mA 80 V MiniP3 F2 B Surface Mount 1 W 185 Single 80 V 5 V 150 MHz 3 1 -
RS Stock No. 168-3479
Mfr. Part No.DSC7003S0L
BrandPanasonic
HK$1.71
Each (On a Reel of 1000)
units
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W 170 Single 60 V 5 V 170 MHz 3 1 -
RS Stock No. 698-7108
Mfr. Part No.DSC500100L
BrandPanasonic
HK$2.719
Each (In a Pack of 50)
units
NPN 100 mA 50 V SMini3 F2 B Surface Mount 150 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 168-3647
Mfr. Part No.DMG904010R
BrandPanasonic
HK$1.75
Each (On a Reel of 8000)
units
NPN + PNP 100 mA 50 V SSMini6 F3 B Surface Mount 125 mW 210 (NPN), 210 (PNP) Isolated - -7 (PNP) V, 7 (NPN) V - 6 2 -
RS Stock No. 168-3362
Mfr. Part No.DSC2001R0L
BrandPanasonic
HK$0.885
Each (On a Reel of 3000)
units
NPN 100 mA 50 V Mini3 G3 B Surface Mount 200 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 168-3380
Mfr. Part No.DSC300100L
BrandPanasonic
HK$1.418
Each (On a Reel of 10000)
units
NPN 100 mA 50 V SSSMini3 F2 B Surface Mount 100 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 707-4275
Mfr. Part No.DSA900100L
BrandPanasonic
HK$2.62
Each (In a Pack of 50)
units
PNP 100 mA 50 V SSMini3 F3 B Surface Mount 125 mW 210 Single -60 V -7 V 150 MHz 3 1 -
RS Stock No. 711-5752
Mfr. Part No.DSC7102S0L
BrandPanasonic
HK$6.516
Each (In a Pack of 10)
units
NPN 1 A 80 V MiniP3 F2 B Surface Mount 1 W 170 Single 80 V 5 V 180 MHz 3 1 -