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. 146-0501
Mfr. Part No.BC846BPN,115
BrandNexperia
€0.025
Each (On a Reel of 3000)
units
NPN + PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 300 mW 200 Isolated -80 V, 80 V 6 (NPN) V, -6 (PNP) V - 6 2 -
RS Stock No. 792-0807
Mfr. Part No.BC846BPN,115
BrandNexperia
€0.083
Each (On a Reel of 100)
units
NPN + PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 300 mW 200 Isolated -80 V, 80 V 6 (NPN) V, -6 (PNP) V - 6 2 -
RS Stock No. 170-8031
Mfr. Part No.BC847BW,135
BrandNexperia
€0.007
Each (On a Reel of 10000)
units
NPN 100 mA 45 V SOT-323 Surface Mount 200 mW 110 Single 50 V 6 V - 3 1 AEC-Q101
RS Stock No. 178-7139
Mfr. Part No.BC847BW,115
BrandNexperia
€0.018
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 303-1596
Mfr. Part No.BC847BW,115
BrandNexperia
€0.22
Each (In a Pack of 10)
units
NPN 100 mA 45 V UMT Surface Mount 200 mW 200 Single 50 V 6 V 100 MHz 3 1 -
RS Stock No. 436-7953
Mfr. Part No.BC847,215
BrandNexperia
€0.102
Each (In a Pack of 50)
units
NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 110 Single 50 V 6 V 100 MHz 3 1 -
RS Stock No. 865-2104
Mfr. Part No.BCX56-16,115
BrandNexperia
€0.14
Each (In a Pack of 100)
units
NPN 1 A 80 V SOT-89 Surface Mount 1.35 W 100 Single 100 V 5 V 180 MHz 3 1 -
RS Stock No. 178-7091
Mfr. Part No.BC847A,215
BrandNexperia
€0.017
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 178-7142
Mfr. Part No.BC847,215
BrandNexperia
€0.019
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 436-7925
Mfr. Part No.BC846B,215
BrandNexperia
€0.102
Each (In a Pack of 50)
units
NPN 100 mA 65 V SOT-23 (TO-236AB) Surface Mount 500 mW 200 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 508-248
Mfr. Part No.BC847A,215
BrandNexperia
€0.034
Each (In a Pack of 200)
units
NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 110 Single 50 V 6 V 100 MHz 3 1 -
RS Stock No. 170-8059
Mfr. Part No.BC847,235
BrandNexperia
€0.016
Each (On a Reel of 10000)
units
NPN 100 mA 45 V TO-236 Surface Mount 250 mW 110 Single 50 V 6 V - 3 1 AEC-Q101
RS Stock No. 103-5676
Mfr. Part No.BC817-40,215
BrandNexperia
€0.021
Each (On a Reel of 3000)
units
NPN 500 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 40 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 165-8533
Mfr. Part No.BCX56-16,115
BrandNexperia
€0.09
Each (On a Reel of 1000)
units
NPN 1 A 80 V SOT-89 Surface Mount 1.35 W 100 Single 100 V 5 V 180 MHz 3 1 -
RS Stock No. 103-5678
Mfr. Part No.BC846BW,115
BrandNexperia
€0.018
Each (On a Reel of 3000)
units
NPN 100 mA 65 V UMT Surface Mount 200 mW 200 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 179-1074
Mfr. Part No.PMBTA06,215
BrandNexperia
€0.028
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 103-7553
Mfr. Part No.BC847BPN,115
BrandNexperia
€0.042
Each (On a Reel of 3000)
units
NPN + PNP 100 mA 45 V UMT Surface Mount 200 mW 200 Isolated 50 V 5 V 100 MHz 6 2 -
RS Stock No. 484-5532
Mfr. Part No.BC847BPN,115
BrandNexperia
€0.05
Each (In a Pack of 50)
units
NPN + PNP 100 mA 45 V UMT Surface Mount 200 mW 200 Isolated 50 V 5 V 100 MHz 6 2 -
RS Stock No. 725-8565
Mfr. Part No.PMBTA06,215
BrandNexperia
€0.056
Each (In a Pack of 100)
units
NPN 500 mA 80 V SOT-23 (TO-236AB) Surface Mount 250 mW 100 Single 80 V 4 V - 3 1 -
RS Stock No. 170-8005
Mfr. Part No.BC847BPN,135
BrandNexperia
€0.014
Each (On a Reel of 10000)
units
NPN + PNP 100 mA 45 V SOT-363 Surface Mount 400 mW 200 Current Mirror 50 V 5 V - 6 2 AEC-Q101