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. 168-6055
Mfr. Part No.TIP36C
MYR7.487
Each (In a Tube of 30)
units
PNP 25 A 100 V TO-247 Through Hole 125 W Single 100 V 5 V 3 MHz 3 1 20.15 x 15.75 x 5.15mm -
RS Stock No. 168-6056
Mfr. Part No.TIP35C
MYR7.308
Each (In a Tube of 30)
units
NPN 25 A 100 V TO-247 Through Hole 125 W Single 100 V 5 V 3 MHz 3 1 20.15 x 15.75 x 5.15mm -
RS Stock No. 251-3558
Mfr. Part No.TIP36C
MYR8.80
Each (In a Pack of 5)
units
PNP 25 A 100 V TO-247 Through Hole 125 W Single 100 V 5 V 3 MHz 3 1 20.15 x 15.75 x 5.15mm -65 °C
RS Stock No. 251-3564
Mfr. Part No.TIP35C
MYR8.92
Each
units
NPN 25 A 100 V TO-247 Through Hole 125 W Single 100 V 5 V 3 MHz 3 1 20.15 x 15.75 x 5.15mm -65 °C
RS Stock No. 686-8045
Mfr. Part No.2SD882
MYR2.709
Each (In a Pack of 10)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W Single 60 V 5 V 100 MHz 3 1 10.8 x 7.8 x 2.7mm -65 °C
RS Stock No. 102-4116
Mfr. Part No.2SD882
MYR2.709
Each (In a Tube of 50)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W Single 60 V 5 V 100 MHz 3 1 10.8 x 7.8 x 2.7mm -
RS Stock No. 102-4111
Mfr. Part No.BD139-10
MYR1.154
Each (In a Tube of 50)
units
NPN 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. 686-8076
Mfr. Part No.BD139-10
MYR1.449
Each (In a Pack of 20)
units
NPN 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 -65 °C
RS Stock No. 168-6780
Mfr. Part No.BD135
MYR1.67
Each (In a Tube of 50)
units
NPN 3 A 45 V SOT-32 Through Hole 1.25 W Single 45 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -
RS Stock No. 168-6165
Mfr. Part No.TIP2955
MYR7.182
Each (In a Tube of 30)
units
PNP 15 A 60 V TO-247 Through Hole 90 W Single 100 V - 3 MHz 3 1 20.15 x 15.75 x 5.15mm -
RS Stock No. 714-0483
Mfr. Part No.BD135
MYR1.67
Each (In a Pack of 20)
units
NPN 3 A 45 V SOT-32 Through Hole 1.25 W Single 45 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -65 °C
RS Stock No. 485-9705
Mfr. Part No.TIP2955
MYR8.452
Each (In a Pack of 5)
units
PNP 15 A 60 V TO-247 Through Hole 90 W Single 100 V - 3 MHz 3 1 20.15 x 15.75 x 5.15mm -65 °C
RS Stock No. 178-1437
Mfr. Part No.TIP31C
MYR2.058
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 485-9812
Mfr. Part No.TIP41C
MYR2.804
Each (In a Pack of 5)
units
NPN 6 A 100 V TO-220 Through Hole 65 W Single 100 V 5 V - 3 1 9.15 x 10.4 x 4.6mm -65 °C
RS Stock No. 168-6170
Mfr. Part No.TIP32C
MYR2.058
Each (In a Tube of 50)
units
PNP 3 A 100 V TO-220 Through Hole 2 W Single 100 V 5 V - 3 1 9.15 x 10.4 x 4.6mm -
RS Stock No. 109-078
Mfr. Part No.BD438
MYR2.888
Each (In a Pack of 5)
units
PNP 4 A 45 V SOT-32 Through Hole 36 W Single 45 V 5 V 3 MHz 3 1 10.8 x 7.8 x 2.7mm -65 °C
RS Stock No. 485-9777
Mfr. Part No.TIP32C
MYR2.50
Each (In a Pack of 5)
units
PNP 3 A 100 V TO-220 Through Hole 2 W Single 100 V 5 V - 3 1 9.15 x 10.4 x 4.6mm -65 °C
RS Stock No. 168-6171
Mfr. Part No.TIP41C
MYR2.31
Each (In a Tube of 50)
units
NPN 6 A 100 V TO-220 Through Hole 65 W Single 100 V 5 V - 3 1 9.15 x 10.4 x 4.6mm -
RS Stock No. 485-9755
Mfr. Part No.TIP31C
MYR2.50
Each (In a Pack of 5)
units
NPN 3 A 100 V TO-220 Through Hole 2 W Single 100 V 5 V - 3 1 9.15 x 10.4 x 4.6mm -65 °C
RS Stock No. 178-1408
Mfr. Part No.BD438
MYR2.326
Each (In a Tube of 50)
units
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