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. 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. 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. 168-3619
Mfr. Part No.DRC2543E0L
BrandPanasonic
SGD0.24
Each (On a Reel of 3000)
units
NPN - 50 V Mini3 G3 B Surface Mount 200 mW Single - - - 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 715-9639
Mfr. Part No.DMA961040R
BrandPanasonic
SGD0.567
Each (In a Pack of 10)
units
PNP - 50 V SSMini5 F4 B Surface Mount 125 mW Common Emitter - - - 5 2 1.6 x 1.2 x 0.5mm -
RS Stock No. 698-0362
Mfr. Part No.DRC5114E0L
BrandPanasonic
SGD0.364
Each (In a Pack of 50)
units
NPN - 50 V SMini3 F2 B Surface Mount - Single - 6 V - 3 1 0.9 x 2mm -55 °C
RS Stock No. 707-4291
Mfr. Part No.DSC700300L
BrandPanasonic
SGD0.655
Each (In a Pack of 10)
units
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W Single 60 V 5 V 170 MHz 3 1 4.5 x 2.5 x 1.5mm -
RS Stock No. 168-3475
Mfr. Part No.DSA900100L
BrandPanasonic
SGD0.112
Each (On a Reel of 3000)
units
PNP 100 mA 50 V SSMini3 F3 B Surface Mount 125 mW Single -60 V -7 V 150 MHz 3 1 1.6 x 0.85 x 0.6mm -
RS Stock No. 760-3088
Mfr. Part No.DMC5610L0R
BrandPanasonic
SGD0.191
Each (On a Tape of 25)
units
NPN - 50 V SMini5 F3 B Surface Mount 150 mW Common Emitter - 50 V - 5 2 2 x 1.25 x 0.6mm -
RS Stock No. 168-3478
Mfr. Part No.DSC700300L
BrandPanasonic
SGD0.311
Each (On a Reel of 1000)
units
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W Single 60 V 5 V 170 MHz 3 1 4.5 x 2.5 x 1.5mm -
RS Stock No. 168-3653
Mfr. Part No.DSC7101S0L
BrandPanasonic
SGD0.329
Each (On a Reel of 1000)
units
NPN 500 mA 80 V MiniP3 F2 B Surface Mount 1 W Single 80 V 5 V 150 MHz 3 1 4.5 x 2.5 x 1.5mm -
RS Stock No. 168-3357
Mfr. Part No.DRC5114E0L
BrandPanasonic
SGD0.116
Each (On a Reel of 3000)
units
NPN - 50 V SMini3 F2 B Surface Mount - Single - 6 V - 3 1 0.9 x 2mm -
RS Stock No. 711-5770
Mfr. Part No.DSC7Q01Q0L
BrandPanasonic
SGD1.15
Each (In a Pack of 10)
units
NPN 1 A 80 V MiniP3 F2 B Surface Mount 1 W Single 100 V 5 V - 3 2 4.5 x 2.5 x 1.5mm -
RS Stock No. 168-3708
Mfr. Part No.DMA961040R
BrandPanasonic
SGD0.171
Each (On a Reel of 8000)
units
PNP - 50 V SSMini5 F4 B Surface Mount 125 mW Common Emitter - - - 5 2 1.6 x 1.2 x 0.5mm -
RS Stock No. 707-4275
Mfr. Part No.DSA900100L
BrandPanasonic
SGD0.476
Each (In a Pack of 50)
units
PNP 100 mA 50 V SSMini3 F3 B Surface Mount 125 mW Single -60 V -7 V 150 MHz 3 1 1.6 x 0.85 x 0.6mm -
RS Stock No. 711-5755
Mfr. Part No.DSC7101S0L
BrandPanasonic
SGD0.732
Each (In a Pack of 10)
units
NPN 500 mA 80 V MiniP3 F2 B Surface Mount 1 W Single 80 V 5 V 150 MHz 3 1 4.5 x 2.5 x 1.5mm -
RS Stock No. 169-7853
Mfr. Part No.DSC2G0300L
BrandPanasonic
SGD0.144
Each (On a Reel of 3000)
units
NPN 50 mA 20 V Mini3 G3 B Surface Mount 200 mW Single 30 V 3 V 1600 MHz 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 168-3480
Mfr. Part No.DSC900100L
BrandPanasonic
SGD0.121
Each (On a Reel of 3000)
units
NPN 100 mA 50 V SSMini3 F3 B Surface Mount 125 mW Single 60 V 7 V 150 MHz 3 1 1.6 x 0.85 x 0.6mm -
RS Stock No. 707-4301
Mfr. Part No.DSC7003S0L
BrandPanasonic
SGD0.683
Each (In a Pack of 10)
units
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W Single 60 V 5 V 170 MHz 3 1 4.5 x 2.5 x 1.5mm -
RS Stock No. 710-6158
Mfr. Part No.DRC2543E0L
BrandPanasonic
SGD0.609
Each (In a Pack of 20)
units
NPN - 50 V Mini3 G3 B Surface Mount 200 mW Single - - - 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 749-8205
Mfr. Part No.DSC2G0300L
BrandPanasonic
SGD0.42
Each (In a Pack of 20)
units
NPN 50 mA 20 V Mini3 G3 B Surface Mount 200 mW Single 30 V 3 V 1600 MHz 3 1 2.9 x 1.5 x 1.1mm -