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. 145-4109
Mfr. Part No.2SD1620-TD-E
PHP11.24
Each (On a Reel of 1000)
units
NPN 3 A 10 V PCP Surface Mount 1.3 W 140 Single 30 V 6 V 1 MHz 3 1 -
RS Stock No. 751-3503
Mfr. Part No.BC846A-7-F
PHP3.172
Each (In a Pack of 250)
units
NPN 100 mA 65 V SOT-23 Surface Mount 300 mW 110 Single 80 V 6 V 300 MHz 3 1 -
RS Stock No. 749-8205
Mfr. Part No.DSC2G0300L
BrandPanasonic
PHP14.65
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. 165-9924
Mfr. Part No.PXT4401,115
BrandNexperia
PHP7.783
Each (On a Reel of 1000)
units
NPN 600 mA 40 V SOT-89 Surface Mount 1.1 W 20 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 822-2659
Mfr. Part No.DPLS160-7
PHP7.446
Each (In a Pack of 100)
units
PNP 1 A 60 V SOT-23 Surface Mount 300 mW 200 Single -80 V -5 V 220 MHz 3 1 -
RS Stock No. 922-8055
Mfr. Part No.ZXTP25040DFHTA
PHP12.373
Each (On a Reel of 3000)
units
PNP 3 A 40 V SOT-23 Surface Mount 1.81 W 30 Single -45 V -7 V 270 MHz 3 1 -
RS Stock No. 153-0713
Mfr. Part No.PHPT60410PYX
BrandNexperia
PHP11.893
Each (On a Reel of 1500)
units
PNP -10 A -40 V LFPAK56, SOT669 Surface Mount 25 W 40 Single -40 V -8 V 97 MHz 4 + Tab 1 AEC-Q101
RS Stock No. 795-8959
Mfr. Part No.BCP56-16
PHP16.852
Each (In a Pack of 25)
units
NPN 1 A 80 V SOT-223 Surface Mount 1.6 W 25 Single 100 V 5 V - 3 + Tab 1 -
RS Stock No. 803-1125
Mfr. Part No.BC550CTA
PHP2.926
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. 170-3459
Mfr. Part No.BC846BLT3G
PHP0.893
Each (On a Reel of 10000)
units
NPN 100 mA 65 V SOT-23 Surface Mount 300 mW 200 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 792-0838
Mfr. Part No.BC868-25,115
BrandNexperia
PHP19.85
Each (On a Tape of 20)
units
NPN 2 A 20 V SOT-89 Surface Mount 1.35 W 40 Single 32 V 5 V - 3 1 -
RS Stock No. 169-0598
Mfr. Part No.BC856A-7-F
PHP1.714
Each (On a Reel of 3000)
units
PNP 100 mA 65 V SOT-23 Surface Mount 300 mW 125 Single -80 V -5 V 200 MHz 3 1 -
RS Stock No. 146-2115
Mfr. Part No.PN2222ATF
PHP1.777
Each (On a Reel of 2000)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 100 Single 75 V 6 V 100 MHz 3 1 -
RS Stock No. 823-1435
Mfr. Part No.LMN200B02-7
PHP15.482
Each (In a Pack of 25)
units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW 250 N+P Loadswitch -50 V -5 V 200 MHz 6 2 -
RS Stock No. 774-0780
Mfr. Part No.50C02SS-TL-E
PHP11.97
Each (In a Pack of 25)
units
NPN 400 mA 50 V SSFP Surface Mount 200 mW 300 Single 60 V 5 V 1 MHz 3 1 -
RS Stock No. 800-9676
Mfr. Part No.BC858BWT1G
PHP2.00
Each (On a Tape of 250)
units
PNP 100 mA 30 V SOT-323 (SC-70) Surface Mount 150 mW 220 Single -30 V -5 V 100 MHz 3 1 -
RS Stock No. 188-8449
Mfr. Part No.BUL1102EFP
PHP50.235
Each (In a Pack of 10)
units
NPN 4 A, 8 (Peak) A 450 V TO-220FP Through Hole 70 W 12 Single - 12 V - 3 1 -
RS Stock No. 169-8618
Mfr. Part No.BC556ABU
PHP2.264
Each (In a Bag of 1000)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS Stock No. 178-5048
Mfr. Part No.2STN2540
PHP8.303
Each (On a Reel of 1000)
units
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RS Stock No. 122-1455
Mfr. Part No.DSS4140U-7
PHP3.78
Each (On a Reel of 3000)
units
NPN 1 A 40 V SOT-323 (SC-70) Surface Mount 400 mW 200 Single 40 V 5 V - 3 1 -
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