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. 485-9755
Mfr. Part No.TIP31C
PHP27.106
Each (In a Pack of 5)
units
NPN 3 A 100 V TO-220 Through Hole 2 W 10 Single 100 V 5 V - 3 1 -
RS Stock No. 805-1078
Mfr. Part No.2N4401TF
PHP3.861
Each (In a Pack of 200)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 436-7947
Mfr. Part No.BC847B,215
BrandNexperia
PHP5.282
Each (In a Pack of 50)
units
NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 200 Single 50 V 6 V 100 MHz 3 1 -
RS Stock No. 896-2656
Mfr. Part No.TTC5200(Q)
BrandToshiba
PHP124.58
Each (In a Pack of 2)
units
NPN 15 A 230 V 2-21F1A Through Hole 150 W 35 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 890-2620
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
PHP112.69
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3P Through Hole 150 W 35 Single -230 V -5 V - 3 1 -
RS Stock No. 739-0439
Mfr. Part No.2N4401BU
PHP9.457
Each (In a Pack of 10)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V - 3 1 -
RS Stock No. 121-6420
Mfr. Part No.MJW21195G
PHP161.832
Each (In a Tube of 30)
units
PNP 16 A 250 V TO-247 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS Stock No. 799-4753
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
PHP113.81
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3PN Through Hole 150 W 35 Single -230 V -5 V 30 MHz 3 1 -
RS Stock No. 145-5498
Mfr. Part No.2N4401TAR
PHP2.062
Each (On a Tape of 2000)
units
NPN 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 122-0085
Mfr. Part No.2N3773G
PHP219.45
Each (In a Tray of 100)
units
NPN 16 A 140 V TO-204 Through Hole 150 W 5 Single 160 V 7 V - 3 1 -
RS Stock No. 862-4979
Mfr. Part No.MJ21193G
PHP319.06
Each (In a Pack of 2)
units
PNP 16 A 250 V TO-204AA Through Hole 250 W 8 Single -400 V -5 V - 2 1 -
RS Stock No. 796-9701
Mfr. Part No.BC547C A1
PHP6.537
Each (In a Pack of 250)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW 420 Single 50 V 6 V - 3 1 -
RS Stock No. 739-0381
Mfr. Part No.PN2222ATA
PHP7.879
Each (In a Pack of 10)
units
NPN 1 A 40 V TO-92 Through Hole 625 mW 35 Single 75 V 6 V 300 MHz 3 1 -
RS Stock No. 486-4577
Mfr. Part No.MJE350
PHP30.732
Each (In a Pack of 5)
units
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W 30 Single 300 V 3 V - 3 1 -
RS Stock No. 320-8229
Mfr. Part No.2SC4081T106Q/R
BrandROHM
PHP2.334
Each (In a Pack of 25)
units
NPN 150 mA 50 V SOT-323 (SC-70) Surface Mount 200 mW 120 Single 60 V 7 V 180 MHz 3 1 -
RS Stock No. 545-2484
Mfr. Part No.BC560CG
PHP3.907
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. 168-6254
Mfr. Part No.MJE350
PHP24.174
Each (In a Tube of 50)
units
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W 30 Single 300 V 3 V - 3 1 -
RS Stock No. 103-2948
Mfr. Part No.MMBT3904LT1G
PHP0.912
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. 793-0753
Mfr. Part No.MMBT3904LT3G
PHP1.729
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. 170-3540
Mfr. Part No.MMBT3904LT3G
PHP0.816
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 -
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