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. 710-6149
Mfr. Part No.DRA2543E0L
BrandPanasonic
€0.327
Each (In a Pack of 20)
units
PNP - 50 V Mini3 G3 B Surface Mount 200 mW Single - - - 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 168-3616
Mfr. Part No.DRA2543E0L
BrandPanasonic
€0.187
Each (On a Reel of 3000)
units
PNP - 50 V Mini3 G3 B Surface Mount 200 mW Single - - - 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 698-0407
Mfr. Part No.DSC200100L
BrandPanasonic
€0.022
Each (In a Pack of 100)
units
NPN 100 mA 50 V Mini3 G3 B Surface Mount 200 mW Single 60 V 7 V 150 MHz 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 168-3657
Mfr. Part No.DSC7Q01Q0L
BrandPanasonic
€0.108
Each (On a Reel of 1000)
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. 168-3503
Mfr. Part No.DRC2143T0L
BrandPanasonic
€0.056
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. 168-3479
Mfr. Part No.DSC7003S0L
BrandPanasonic
€0.14
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. 707-4291
Mfr. Part No.DSC700300L
BrandPanasonic
€0.143
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. 168-3380
Mfr. Part No.DSC300100L
BrandPanasonic
€0.022
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. 713-2854
Mfr. Part No.DSC2002R0L
BrandPanasonic
€0.28
Each (In a Pack of 20)
units
NPN 500 mA 50 V Mini3 G3 B B Surface Mount 200 mW Single 60 V 5 V 160 MHz 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 168-3653
Mfr. Part No.DSC7101S0L
BrandPanasonic
€0.097
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. 168-3478
Mfr. Part No.DSC700300L
BrandPanasonic
€0.14
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. 168-3357
Mfr. Part No.DRC5114E0L
BrandPanasonic
€0.026
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. 760-3088
Mfr. Part No.DMC5610L0R
BrandPanasonic
€0.109
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. 168-3721
Mfr. Part No.DMC201A00R
BrandPanasonic
€0.117
Each (On a Reel of 3000)
units
NPN 500 mA 20 V Mini5 G3 B Surface Mount 300 mW Common Emitter 25 V 12 V 150 MHz 5 2 2.9 x 1.5 x 1.1mm -
RS Stock No. 707-4437
Mfr. Part No.DRC2143T0L
BrandPanasonic
€0.196
Each (In a Pack of 50)
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. 169-7853
Mfr. Part No.DSC2G0300L
BrandPanasonic
€0.08
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. 698-7105
Mfr. Part No.DSC300100L
BrandPanasonic
€0.022
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. 168-3619
Mfr. Part No.DRC2543E0L
BrandPanasonic
€0.042
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. 168-3708
Mfr. Part No.DMA961040R
BrandPanasonic
€0.095
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. 715-9702
Mfr. Part No.DMC201A00R
BrandPanasonic
€0.11
Each (In a Pack of 10)
units
NPN 500 mA 20 V Mini5 G3 B Surface Mount 300 mW Common Emitter 25 V 12 V 150 MHz 5 2 2.9 x 1.5 x 1.1mm -