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 Minimum Operating Temperature
RS Stock No. 896-2625
Mfr. Part No.2SC2712-Y,LF(T
BrandToshiba
SGD0.072
Each (In a Pack of 50)
units
NPN 150 mA 50 V TO-236MOD Surface Mount 150 mW Single 60 V 5 V 80 MHz 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 756-0192
Mfr. Part No.2SA2056(TE85L,F)
BrandToshiba
SGD0.427
Each (In a Pack of 10)
units
PNP 2 A 50 V TSM Surface Mount 1 W Single -50 V -7 V - 3 1 2.9 x 1.6 x 0.7mm -
RS Stock No. 799-4753
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
SGD3.686
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3PN Through Hole 150 W Single -230 V -5 V 30 MHz 3 1 15.5 x 4.5 x 20mm -
RS Stock No. 890-2620
Mfr. Part No.2SA1943N(S1,E,S)
BrandToshiba
SGD3.686
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3P Through Hole 150 W Single -230 V -5 V - 3 1 15.5 x 4.5 x 20mm -
RS Stock No. 756-0293
Mfr. Part No.2SC5886A(T6L1,NQ)
BrandToshiba
SGD1.396
Each (In a Pack of 5)
units
NPN 5 A 50 V DPAK (TO-252) Surface Mount 20 W Single 120 V 9 V - 3 1 6.5 x 5.5 x 2.3mm -
RS Stock No. 601-1157
Mfr. Part No.2SA1162-Y(TE85L,F)
BrandToshiba
SGD0.074
Each (On a Reel of 3000)
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 -55 °C
RS Stock No. 756-0240
Mfr. Part No.2SC3303-Y(T6L1,NQ)
BrandToshiba
SGD0.72
Each (In a Pack of 5)
units
NPN 5 A 80 V DPAK (TO-252) Surface Mount 20 W Single 100 V 7 V 120 MHz 3 1 6.5 x 5.5 x 2.3mm -
RS Stock No. 168-7405
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
SGD3.045
Each (In a Tube of 100)
units
PNP 15 A 230 V TO-3PL Through Hole 150 W Single -230 V -5 V 30 MHz 3 1 20.5 x 5.2 x 26mm -
RS Stock No. 760-3117
Mfr. Part No.2SA1943-O(Q)
BrandToshiba
SGD5.34
Each
units
PNP 15 A 230 V TO-3PL Through Hole 150 W Single -230 V -5 V 30 MHz 3 1 20.5 x 5.2 x 26mm -
RS Stock No. 531-9523
Mfr. Part No.2SC4116-Y(F)
BrandToshiba
SGD0.068
Each (In a Pack of 10)
units
NPN 150 mA 50 V USM Surface Mount 100 mW Single 60 V 5 V 80 MHz 3 1 0.9 x 2 x 1.25mm -55 °C
RS Stock No. 184-868
Mfr. Part No.2SC5198-O(Q)
BrandToshiba
SGD5.10
Each
units
NPN 10 A 140 V TO-3PN Through Hole 100 W Single 140 V 5 V 30 MHz 3 1 19 x 15.9 x 4.8mm -
RS Stock No. 890-2626
Mfr. Part No.2SA1721-O(TE85L,F)
BrandToshiba
SGD0.341
Each (In a Pack of 25)
units
PNP 100 mA 300 V SOT-346 (SC-59) Surface Mount 150 mW Single -300 V -5 V - 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 601-1270
Mfr. Part No.2SA1987-O(Q)
BrandToshiba
SGD5.786
Each (In a Pack of 5)
units
PNP 15 A 230 V TO-3PL Through Hole 180 W Single 230 V 5 V 30 MHz 3 1 26 x 20.5 x 5.2mm -55 °C
RS Stock No. 540-6605
Mfr. Part No.RN1108(F)
BrandToshiba
SGD0.146
Each (In a Pack of 5)
units
NPN - 50 V ESM Surface Mount - Single - 7 V - 3 1 1.6 x 0.8 x 0.7mm -
RS Stock No. 540-6582
Mfr. Part No.RN2107(F)
BrandToshiba
SGD0.146
Each (In a Pack of 5)
units
PNP - 50 V ESM Surface Mount - Single - 6 V - 3 1 1.6 x 0.8 x 0.7mm -
RS Stock No. 601-1703
Mfr. Part No.2SC5358-O(Q)
BrandToshiba
SGD2.546
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PN Through Hole 150 W Single 230 V 5 V 30 MHz 3 1 19 x 15.9 x 4.8mm -
RS Stock No. 756-0219
Mfr. Part No.2SA2097(TE16L1,NQ)
BrandToshiba
SGD1.618
Each (In a Pack of 5)
units
PNP 5 A 50 V DPAK (TO-252) Surface Mount 20 W Single -50 V -7 V - 3 1 6.5 x 5.5 x 2.3mm -
RS Stock No. 756-3860
Mfr. Part No.TPCP8505(TE85L,F)
BrandToshiba
SGD0.489
Each (In a Pack of 10)
units
NPN 3 A 50 V PS Surface Mount 3 W Single 100 V 7 V - 8 1 2.9 x 2.4 x 0.8mm -
RS Stock No. 890-2682
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
SGD4.376
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PL Through Hole 150 W Single 230 V 5 V - 3 1 20.5 x 26 x 5.2mm -
RS Stock No. 540-6554
Mfr. Part No.RN1106(F)
BrandToshiba
SGD0.11
Each (In a Pack of 5)
units
NPN - 50 V ESM Surface Mount - Single - 5 V - 3 1 1.6 x 0.8 x 0.7mm -