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. 485-9705
Mfr. Part No.TIP2955
$3.098
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. 168-6165
Mfr. Part No.TIP2955
$2.71
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. 168-6055
Mfr. Part No.TIP36C
$3.245
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. 251-3558
Mfr. Part No.TIP36C
$3.82
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. 168-6168
Mfr. Part No.TIP3055
$1.197
Each (In a Tube of 30)
units
NPN 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. 485-9727
Mfr. Part No.TIP3055
$2.144
Each (In a Pack of 5)
units
NPN 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. 251-3564
Mfr. Part No.TIP35C
$3.74
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. 168-6056
Mfr. Part No.TIP35C
$2.589
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. 178-1437
Mfr. Part No.TIP31C
$0.919
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 485-9755
Mfr. Part No.TIP31C
$1.064
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. 168-6137
Mfr. Part No.D44H8
$1.397
Each (In a Tube of 50)
units
NPN 20 A 60 V TO-220 Through Hole 50 W Single 60 V 5 V - 3 1 9.15 x 10.4 x 4.6mm -
RS Stock No. 168-8859
Mfr. Part No.HD1750FX
$4.48
Each (In a Tube of 30)
units
NPN 24 A 800 V ISOWATT218FX Through Hole 75 W Single - 10 V - 3 1 15.7 x 5.7 x 26.7mm -
RS Stock No. 178-1488
Mfr. Part No.BUL38D
$1.60
Each (In a Tube of 50)
units
NPN 5 A 800 V TO-220 Through Hole 80 W Single - 9 V - 3 1 10.4 x 4.6 x 15.75mm -
RS Stock No. 168-6073
Mfr. Part No.MJE3055T
$1.117
Each (In a Tube of 50)
units
NPN 10 A 60 V TO-220 Through Hole 75 W Single 70 V 5 V 2 MHz 3 1 9.15 x 10.4 x 4.6mm -
RS Stock No. 810-7376
Mfr. Part No.BUL38D
$1.708
Each (In a Pack of 10)
units
NPN 5 A 800 V TO-220 Through Hole 80 W Single - 9 V - 3 1 10.4 x 4.6 x 15.75mm -
RS Stock No. 485-9137
Mfr. Part No.D44H8
$1.638
Each (In a Pack of 5)
units
NPN 20 A 60 V TO-220 Through Hole 50 W Single 60 V 5 V - 3 1 9.15 x 10.4 x 4.6mm -65 °C
RS Stock No. 877-2671
Mfr. Part No.HD1750FX
$4.998
Each (In a Pack of 5)
units
NPN 24 A 800 V ISOWATT218FX Through Hole 75 W Single - 10 V - 3 1 15.7 x 5.7 x 26.7mm -
RS Stock No. 486-4577
Mfr. Part No.MJE350
$1.586
Each (In a Pack of 5)
units
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W Single 300 V 3 V - 3 1 10.8 x 7.8 x 2.7mm -65 °C
RS Stock No. 102-4116
Mfr. Part No.2SD882
$1.094
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. 168-6254
Mfr. Part No.MJE350
$0.929
Each (In a Tube of 50)
units
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W Single 300 V 3 V - 3 1 10.8 x 7.8 x 2.7mm -