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. 756-0265
Mfr. Part No.2SC5200-R(Q)
BrandToshiba
SGD2.46
Each
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 55 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 826-8443
Mfr. Part No.2SD1782KT146R
BrandROHM
SGD0.42
Each (In a Pack of 40)
units
NPN 500 mA 80 V SOT-346 (SC-59) Surface Mount 200 mW 120 Single 80 V 5 V 100 MHz 3 1 -
RS Stock No. 121-9976
Mfr. Part No.FCX790ATA
SGD0.327
Each (On a Reel of 1000)
units
PNP 2 A 40 V SOT-89 Surface Mount 2 W 150 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 739-0408
Mfr. Part No.SS8550DTA
SGD0.20
Each (In a Pack of 10)
units
PNP 1.5 A 25 V TO-92 Through Hole 1 W 40 Single -40 V -6 V 200 MHz 3 1 -
RS Stock No. 725-8574
Mfr. Part No.PXT2907A,115
BrandNexperia
SGD0.276
Each (In a Pack of 10)
units
PNP 600 mA 60 V SOT-89 Surface Mount 1.1 W 50 Single -60 V -5 V - 3 1 -
RS Stock No. 774-3224
Mfr. Part No.2N3771G
SGD7.66
Each
units
NPN 30 A 40 V TO-204AA Through Hole 150 W 5 Single 50 V 5 V 50 kHz 2 1 -
RS Stock No. 163-1096
Mfr. Part No.NSS1C201LT1G
SGD0.203
Each (On a Reel of 3000)
units
NPN 3 A 100 V SOT-23 Surface Mount 490 mW 40 Single 7 V dc 140 V 100 MHz 3 1 -
RS Stock No. 826-8608
Mfr. Part No.UMX1NTN
BrandROHM
SGD0.151
Each (In a Pack of 75)
units
NPN 150 mA 50 V SOT-363 (SC-88) Surface Mount 150 mW 120 Isolated 60 V 7 V 100 MHz 6 2 -
RS Stock No. 166-3664
Mfr. Part No.SS8050CTA
SGD0.057
Each (On a Tape of 2000)
units
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V 1 MHz 3 1 -
RS Stock No. 690-0076
Mfr. Part No.BC817-25LT3G
SGD0.059
Each (In a Pack of 25)
units
NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 40 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 545-2743
Mfr. Part No.BC817-25LT1G
SGD0.025
Each (On a Reel of 3000)
units
NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 40 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 690-0088
Mfr. Part No.BC846BDW1T1G
SGD0.071
Each (In a Pack of 25)
units
NPN 100 mA 65 V SOT-363 (SC-88) Surface Mount 380 mW 200 Isolated 80 V 6 V 100 MHz 6 2 -
RS Stock No. 170-3461
Mfr. Part No.BCP56-16T3G
SGD0.13
Each (On a Reel of 4000)
units
NPN 1 A 80 V SOT-223 Surface Mount 1.5 W 25 Single 100 V 5 V 35 MHz 3 + Tab 1 -
RS Stock No. 690-0123
Mfr. Part No.PZTA92T1G
SGD0.437
Each (In a Pack of 10)
units
PNP 500 mA 300 V SOT-223 Surface Mount 1.5 W 25 Single 300 V 5 V 50 MHz 3 + Tab 1 -
RS Stock No. 800-9651
Mfr. Part No.BC856BM3T5G
SGD0.054
Each (On a Tape of 250)
units
PNP 100 mA 65 V SOT-723 Surface Mount 265 mW 220 Single -80 V -5 V 100 MHz 3 1 -
RS Stock No. 807-5226
Mfr. Part No.BUT11ATU
SGD0.93
Each (In a Pack of 10)
units
NPN 5 A 450 V TO-220 Through Hole 100 W - Single 1000 V 9 V - 3 1 -
RS Stock No. 545-0371
Mfr. Part No.MMBT4401LT1G
SGD0.172
Each (In a Pack of 50)
units
NPN 600 mA 40 V SOT-23 Surface Mount 300 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 901-4109
Mfr. Part No.TSD2150ACY RMG
SGD0.276
Each (In a Pack of 50)
units
NPN 3 A 50 V SOT-89 Surface Mount 600 mW 150 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 145-5589
Mfr. Part No.KSC945YTA
SGD0.034
Each (On a Tape of 2000)
units
NPN 150 mA 50 V TO-92 Through Hole 250 mW 40 Single 60 V 5 V 1 MHz 3 1 -
RS Stock No. 102-2276
Mfr. Part No.MJE15033G
SGD2.764
Each (In a Tube of 50)
units
PNP 8 A 250 V TO-220AB Through Hole 50 W 10 Single 250 V 5 V 30 MHz 3 1 -
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