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. 168-3647
Mfr. Part No.DMG904010R
BrandPanasonic
£0.041
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 (NPN) V, -7 (PNP) V - 6 2 -
RS Stock No. 711-5544
Mfr. Part No.DMG904010R
BrandPanasonic
£0.04
Each (In a Pack of 10)
Units
NPN + PNP 100 mA 50 V SSMini6 F3 B Surface Mount 125 mW 210 (NPN), 210 (PNP) Isolated - 7 (NPN) V, -7 (PNP) V - 6 2 -
RS Stock No. 168-3585
Mfr. Part No.DMC206010R
BrandPanasonic
£0.127
Each (On a Reel of 3000)
Units
NPN 100 mA 50 V Mini6 G4 B Surface Mount 300 mW 210 Isolated 60 V 7 V 150 MHz 6 2 -
RS Stock No. 710-5966
Mfr. Part No.DMC206010R
BrandPanasonic
£0.226
Each (In a Pack of 20)
Units
NPN 100 mA 50 V Mini6 G4 B Surface Mount 300 mW 210 Isolated 60 V 7 V 150 MHz 6 2 -
RS Stock No. 715-9718
Mfr. Part No.DMC204C00R
BrandPanasonic
£0.245
Each (In a Pack of 10)
Units
NPN 20 mA 100 V Mini6 G4 B Surface Mount 300 mW 400 Isolated 100 V 15 V 140 MHz 6 2 -
RS Stock No. 168-3362
Mfr. Part No.DSC2001R0L
BrandPanasonic
£0.039
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. 698-0400
Mfr. Part No.DSC2001R0L
BrandPanasonic
£0.088
Each (In a Pack of 100)
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. 168-3726
Mfr. Part No.DMC204C00R
BrandPanasonic
£0.127
Each (On a Reel of 3000)
Units
NPN 20 mA 100 V Mini6 G4 B Surface Mount 300 mW 400 Isolated 100 V 15 V 140 MHz 6 2 -
RS Stock No. 713-2725
Mfr. Part No.DMA501010R
BrandPanasonic
£0.237
Each (In a Pack of 20)
Units
PNP - 50 V SMini5 F3 B Surface Mount 150 mW 210 Common Emitter - -7 V - 5 2 -
RS Stock No. 698-7095
Mfr. Part No.DSA500100L
BrandPanasonic
£0.186
Each (In a Pack of 50)
Units
PNP 100 mA 50 V SMini3 F2 B Surface Mount 150 mW 210 Single -60 V -7 V 150 MHz 3 1 -
RS Stock No. 711-5768
Mfr. Part No.DSC7505R0L
BrandPanasonic
£0.142
Each (In a Pack of 10)
Units
NPN 3 A 20 V MiniP3 F2 B Surface Mount 1 W 340 Single 40 V 7 V 200 MHz 3 1 -
RS Stock No. 168-3655
Mfr. Part No.DSC7505R0L
BrandPanasonic
£0.144
Each (On a Reel of 1000)
Units
NPN 3 A 20 V MiniP3 F2 B Surface Mount 1 W 340 Single 40 V 7 V 200 MHz 3 1 -
RS Stock No. 749-8205
Mfr. Part No.DSC2G0300L
BrandPanasonic
£0.206
Each (In a Pack of 20)
Units
NPN 50 mA 20 V Mini3 G3 B Surface Mount 200 mW 25 Single 30 V 3 V 1600 MHz 3 1 -
RS Stock No. 169-7853
Mfr. Part No.DSC2G0300L
BrandPanasonic
£0.069
Each (On a Reel of 3000)
Units
NPN 50 mA 20 V Mini3 G3 B Surface Mount 200 mW 25 Single 30 V 3 V 1600 MHz 3 1 -
RS Stock No. 168-3695
Mfr. Part No.DMA501010R
BrandPanasonic
£0.078
Each (On a Reel of 3000)
Units
PNP - 50 V SMini5 F3 B Surface Mount 150 mW 210 Common Emitter - -7 V - 5 2 -
RS Stock No. 168-3379
Mfr. Part No.DSA500100L
BrandPanasonic
£0.059
Each (On a Reel of 3000)
Units
PNP 100 mA 50 V SMini3 F2 B Surface Mount 150 mW 210 Single -60 V -7 V 150 MHz 3 1 -
RS Stock No. 713-2851
Mfr. Part No.DSC200200L
BrandPanasonic
£0.074
Each (In a Pack of 20)
Units
NPN 500 mA 50 V Mini3 G3 B B Surface Mount 200 mW 120 Single 60 V 5 V 160 MHz 3 1 -
RS Stock No. 168-3475
Mfr. Part No.DSA900100L
BrandPanasonic
£0.059
Each (On a Reel of 3000)
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. 760-3066
Mfr. Part No.DSA2G01B0L
BrandPanasonic
£0.05
Each (On a Tape of 25)
Units
PNP 30 mA 20 V Mini3 G3 B Surface Mount 200 mW 70 Single -30 V -5 V 300 MHz 3 1 -
RS Stock No. 168-3471
Mfr. Part No.DSA5001S0L
BrandPanasonic
£0.033
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 -