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. 765-9429
Mfr. Part No.BC33716BU
SGD0.163
Each (In a Pack of 100)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW Single - 5 V 100 MHz 3 1 4.58 x 3.86 x 4.58mm -
RS Stock No. 816-6779
Mfr. Part No.PHE13005,127
SGD0.364
Each (In a Pack of 50)
units
NPN 4 A 400 V TO-220AB Through Hole 75 W Single 700 V 9 V 60 Hz 3 1 10.3 x 4.7 x 16mm -
RS Stock No. 296-273
Mfr. Part No.MJ15004G
SGD10.68
Each
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PNP 20 A 140 V TO-204AA Through Hole 250 W Single 140 V 5 V 2 MHz 2 1 39.37 x 26.67 x 8.51mm -65 °C
RS Stock No. 122-0070
Mfr. Part No.MJ15004G
SGD7.634
Each (In a Tray of 100)
units
PNP 20 A 140 V TO-204AA Through Hole 250 W Single 140 V 5 V 2 MHz 2 1 39.37 x 26.67 x 8.51mm -
RS Stock No. 774-3571
Mfr. Part No.MJL21194G
SGD8.25
Each
units
NPN 16 A 250 V TO-3BPL Through Hole 200 W Single 400 V 5 V 1 MHz 3 1 20.3 x 5.3 x 29mm -65 °C
RS Stock No. 545-2210
Mfr. Part No.2N3055G
SGD9.64
Each
units
NPN 15 A 60 V TO-204 Through Hole 115 W Single 100 V 7 V 2.5 MHz 3 1 8.51 x 39.37 x 26.67mm -65 °C
RS Stock No. 103-5143
Mfr. Part No.MJL21194G
SGD6.216
Each (In a Tube of 25)
units
NPN 16 A 250 V TO-3BPL Through Hole 200 W Single 400 V 5 V 1 MHz 3 1 20.3 x 5.3 x 29mm -
RS Stock No. 698-7105
Mfr. Part No.DSC300100L
BrandPanasonic
SGD0.454
Each (In a Pack of 50)
units
NPN 100 mA 50 V SSSMini3 F2 B Surface Mount 100 mW Single 60 V 7 V 150 MHz 3 1 1.2 x 0.8 x 0.47mm -
RS Stock No. 103-2964
Mfr. Part No.2N3055G
SGD6.531
Each (In a Tray of 100)
units
NPN 15 A 60 V TO-204AA Through Hole 115 W Single 100 V 7 V 2.5 MHz 2 1 8.51 x 39.37 x 26.67mm -
RS Stock No. 168-3380
Mfr. Part No.DSC300100L
BrandPanasonic
SGD0.454
Each (On a Reel of 10000)
units
NPN 100 mA 50 V SSSMini3 F2 B Surface Mount 100 mW Single 60 V 7 V 150 MHz 3 1 1.2 x 0.8 x 0.47mm -
RS Stock No. 103-1578
Mfr. Part No.BU508AW
SGD3.507
Each (In a Tube of 30)
units
NPN 8 A 700 V TO-247 Through Hole 125 W Single - 9 V - 3 1 20.15 x 15.75 x 5.15mm -
RS Stock No. 714-6746
Mfr. Part No.BU508AW
SGD4.135
Each (In a Pack of 2)
units
NPN 8 A 700 V TO-247 Through Hole 125 W Single - 9 V - 3 1 20.15 x 15.75 x 5.15mm -65 °C
RS Stock No. 125-0067
Mfr. Part No.MJ21194G
SGD8.264
Each (In a Tray of 100)
units
NPN 16 A 250 V TO-204 Through Hole 250 W Single 400 V 5 V 4 MHz 3 1 8.51 x 39.37 x 26.67mm -
RS Stock No. 122-0234
Mfr. Part No.DZT5551-13
SGD0.216
Each (On a Reel of 2500)
units
NPN 600 mA 160 V SOT-223 Surface Mount 1 W Single 180 V 6 V 300 MHz 3 + Tab 1 6.55 x 3.55 x 1.65mm -
RS Stock No. 545-0236
Mfr. Part No.MJ21194G
SGD11.58
Each
units
NPN 16 A 250 V TO-204 Through Hole 250 W Single 400 V 5 V 4 MHz 3 1 8.51 x 39.37 x 26.67mm -65 °C
RS Stock No. 112-5453
Mfr. Part No.BCP56,115
BrandNexperia
SGD0.638
Each (In a Pack of 5)
units
NPN 1 A 80 V SOT-223 (SC-73) Surface Mount 960 mW Single 100 V 5 V 180 MHz 4 1 1.7 x 6.7 x 3.7mm -65 °C
RS Stock No. 751-4329
Mfr. Part No.DZT5551-13
SGD0.489
Each (In a Pack of 25)
units
NPN 600 mA 160 V SOT-223 Surface Mount 1 W Single 180 V 6 V 300 MHz 3 + Tab 1 6.55 x 3.55 x 1.65mm -55 °C
RS Stock No. 145-2798
Mfr. Part No.BC560CG
SGD0.055
Each (In a Bag of 5000)
units
PNP 100 mA 45 V TO-92 Through Hole 625 mW Single 50 V 5 V 250 MHz 3 1 5.33 x 5.2 x 4.19mm -
RS Stock No. 168-6074
Mfr. Part No.BD140
SGD0.735
Each (In a Tube of 50)
units
PNP 3 A 80 V SOT-32 Through Hole 1.25 W Single 80 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -
RS Stock No. 145-4605
Mfr. Part No.FJP5555TU
SGD1.271
Each (In a Tube of 50)
units
NPN 5 A 400 V TO-220 Through Hole 75 W Single 1050 V 14 V - 3 1 10.67 x 4.83 x 16.51mm -