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. 168-6044
Mfr. Part No.BD911
kr 9,842
Each (In a Tube of 50)
Units
NPN 15 A 100 V TO-220 Through Hole 90 W 5 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 169-3158
Mfr. Part No.BD911
kr 11,07
Each
Units
NPN 15 A 100 V TO-220 Through Hole 90 W 5 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 774-3571
Mfr. Part No.MJL21194G
kr 42,77
Each
Units
NPN 16 A 250 V TO-3BPL Through Hole 200 W 8 Single 400 V 5 V 1 MHz 3 1 -
RS Stock No. 103-5143
Mfr. Part No.MJL21194G
kr 36,478
Each (In a Tube of 25)
Units
NPN 16 A 250 V TO-3BPL Through Hole 200 W 8 Single 400 V 5 V 1 MHz 3 1 -
RS Stock No. 169-3164
Mfr. Part No.BD912
kr 22,93
Each
Units
PNP 15 A 100 V TO-220 Through Hole 90 W 5 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 168-6045
Mfr. Part No.BD912
kr 10,443
Each (In a Tube of 50)
Units
PNP 15 A 100 V TO-220 Through Hole 90 W 5 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 545-0343
Mfr. Part No.MMBT3904LT1G
kr 0,971
Each (In a Pack of 50)
Units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW 40 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 793-0753
Mfr. Part No.MMBT3904LT3G
kr 0,329
Each (In a Pack of 200)
Units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW 30 Single 60 V dc 6 V 100 MHz 3 1 -
RS Stock No. 145-2798
Mfr. Part No.BC560CG
kr 0,259
Each (In a Bag of 5000)
Units
PNP 100 mA 45 V TO-92 Through Hole 625 mW 100 Single 50 V 5 V 250 MHz 3 1 -
RS Stock No. 170-3540
Mfr. Part No.MMBT3904LT3G
kr 0,147
Each (On a Reel of 10000)
Units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW 30 Single 60 V dc 6 V 100 MHz 3 1 -
RS Stock No. 545-2484
Mfr. Part No.BC560CG
kr 0,58
Each (In a Pack of 50)
Units
PNP 100 mA 45 V TO-92 Through Hole 625 mW 100 Single 50 V 5 V 250 MHz 3 1 -
RS Stock No. 165-8564
Mfr. Part No.BF622
BrandNexperia
kr 1,607
Each (On a Reel of 1000)
Units
NPN 50 mA 250 V SOT-89 Surface Mount 1.1 W 50 Single 250 V 5 V 100 MHz 3 1 -
RS Stock No. 103-2948
Mfr. Part No.MMBT3904LT1G
kr 0,173
Each (On a Reel of 3000)
Units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW 40 Single 60 V 6 V 300 MHz 3 1 -
RS Stock No. 816-7794
Mfr. Part No.BF622
BrandNexperia
kr 3,375
Each (In a Pack of 20)
Units
NPN 50 mA 250 V SOT-89 Surface Mount 1.1 W 50 Single 250 V 5 V 100 MHz 3 1 -
RS Stock No. 169-8617
Mfr. Part No.BC550CTA
kr 0,301
Each (On a Tape of 2000)
Units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 5 V 1 MHz 3 1 -
RS Stock No. 761-3701
Mfr. Part No.MPSA42
kr 2,58
Each (In a Pack of 50)
Units
NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
RS Stock No. 781-5222
Mfr. Part No.SMMBT2222ALT1G
kr 0,624
Each (In a Pack of 100)
Units
NPN 600 mA 40 V SOT-23 Surface Mount 225 mW 40 Single 75 V dc 6 V 100 MHz 3 1 AEC-Q101
RS Stock No. 463-634
Mfr. Part No.MJE15032G
kr 13,42
Each (In a Pack of 5)
Units
NPN 8 A 250 V TO-220AB Through Hole 2 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 803-1125
Mfr. Part No.BC550CTA
kr 0,56
Each (In a Pack of 200)
Units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 5 V 1 MHz 3 1 -
RS Stock No. 124-1357
Mfr. Part No.MPSA42
kr 0,867
Each (In a Bag of 1000)
Units
NPN 500 mA 300 V TO-92 Through Hole 625 mW 25 Single 300 V 6 V 50 MHz 3 1 -
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