Bipolar Transistors

Bipolar Transistors are a solid state, three-pin devices made from three layers of silicon. A bipolar transistor 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

Bipolar transistors are constructed 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.

How do bipolar transistors work?

Bipolar transistors have 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.

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.

They are also available as;

  • Digital transistors - are made of a semiconductor material, usually silicon, which conducts the current (or electricity) with little resistance. They also tend to have at least three terminals for easy connection to an external circuit.
  • UJT transistors - constructed of a bar of lightly dope N type silicone with a small piece of heavily doped P type material attached to one side. Since the silicon bar is lightly dope it has very high resistance.

Applications of bipolar transistors?

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 Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Dimensions Maximum Base Emitter Saturation Voltage
RS Stock No. 890-2591
Mfr. Part No.2SA1244-Y(T6L1,NQ)
BrandToshiba
MYR4.42
Each (In a Pack of 10)
units
PNP 5 A 50 V DPAK (TO-252) Surface Mount 20 W Single -60 V -5 V - 3 1 6.5 x 2.3 x 7mm -
RS Stock No. 124-1731
Mfr. Part No.BC33725TA
MYR0.196
Each (On a Reel of 2000)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW Single - 5 V 100 MHz 3 1 5.33 x 5.2 x 4.19mm -
RS Stock No. 803-1061
Mfr. Part No.BC33725TFR
MYR0.404
Each (In a Pack of 200)
units
NPN 800 mA 50 V TO-92 Through Hole 625 mW Single 10 V 5 V 50 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 163-0849
Mfr. Part No.2SC5707-TL-E
MYR1.323
Each (On a Reel of 700)
units
NPN 8 A 50 V TP-FA Surface Mount 15 W Single 100 V 6 V 1 MHz 4 1 6.5 x 5.5 x 2.3mm -
RS Stock No. 145-5441
Mfr. Part No.FJP13009TU
MYR3.88
Each (In a Tube of 50)
units
NPN 12 A 400 V TO-220 Through Hole 100 W Single 700 V 9 V 4 MHz 3 1 10.67 x 4.83 x 16.51mm -
RS Stock No. 738-7575
Mfr. Part No.2N2222ADCSM
BrandSemelab
MYR150.32
Each
units
NPN 800 mA 50 V LCC 2 Surface Mount 500 mW Isolated 75 V 6 V 250 MHz 6 2 6.22 x 4.32 x 1.4mm -
RS Stock No. 177-5497
Mfr. Part No.2N2222ADCSM
BrandSemelab
MYR153.465
Each (In a Tray of 100)
units
NPN 800 mA 50 V LCC 2 Surface Mount 500 mW Isolated 75 V 6 V 250 MHz 6 2 6.22 x 4.32 x 1.4mm -
RS Stock No. 805-1104
Mfr. Part No.2N5551TA
MYR0.274
Each (In a Pack of 200)
units
NPN 600 mA 160 V TO-92 Through Hole 625 mW Single 180 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 903-4077
Mfr. Part No.2SC5200OTU
MYR11.556
Each (In a Pack of 5)
units
NPN 17 A 250 V TO-264 Through Hole 150 W Single 250 V 5 V 30 MHz 3 1 20 x 5 x 26mm -
RS Stock No. 545-0438
Mfr. Part No.MMBTA42LT1G
MYR0.504
Each (In a Pack of 50)
units
NPN 500 mA 300 V SOT-23 Surface Mount 300 mW Single 300 V 6 V 50 MHz 3 1 0.94 x 2.9 x 1.3mm -
RS Stock No. 170-4161
Mfr. Part No.BC548A A1
MYR0.121
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 739-0423
Mfr. Part No.KSB772YSTU
MYR1.62
Each (In a Pack of 5)
units
PNP 3 A 30 V TO-126 Through Hole 10 W Single -40 V -5 V 80 MHz 3 1 8 x 3.25 x 11mm -
RS Stock No. 124-1728
Mfr. Part No.BC32740TA
MYR0.192
Each (On a Reel of 2000)
units
PNP 800 mA 45 V TO-92 Through Hole 625 mW Single - 5 V 100 MHz 3 1 5.33 x 5.2 x 4.19mm -
RS Stock No. 805-1113
Mfr. Part No.2N5551TF
MYR0.261
Each (In a Pack of 200)
units
NPN 600 mA 160 V TO-92 Through Hole 625 mW Single 180 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 601-1135
Mfr. Part No.2SA1162-GR(F)
BrandToshiba
MYR0.213
Each (In a Pack of 10)
units
PNP 150 mA 50 V SOT-346 (SC-59) Surface Mount 150 mW Single 50 V 5 V 80 MHz 3 1 1.1 x 2.9 x 1.5mm -
RS Stock No. 805-1100
Mfr. Part No.2N5551BU
MYR0.274
Each (In a Pack of 200)
units
NPN 600 mA 160 V TO-92 Through Hole 625 mW Single 180 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm -
RS Stock No. 671-1107
Mfr. Part No.BC32740TA
MYR0.712
Each (In a Pack of 10)
units
PNP 800 mA 45 V TO-92 Through Hole 625 mW Single - 5 V 100 MHz 3 1 5.33 x 5.2 x 4.19mm -
RS Stock No. 295-539
Mfr. Part No.ZTX753
MYR2.938
Each (In a Pack of 5)
units
PNP 2 A 100 V E-Line Through Hole 1 W Single 120 V 5 V 140 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 445-2219
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
MYR1.125
Each (In a Pack of 10)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW Single 20 V 2.5 V 5000 MHz 3 1 1 x 2.9 x 1.3mm -
RS Stock No. 124-1460
Mfr. Part No.2SC5200OTU
MYR12.118
Each (In a Tube of 25)
units
NPN 17 A 250 V TO-264 Through Hole 150 W Single 250 V 5 V 30 MHz 3 1 20 x 5 x 26mm -