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. 170-4162
Mfr. Part No.BC548C A1
MYR0.158
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9717
Mfr. Part No.BC548C A1
MYR0.534
Each (In a Pack of 250)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9713
Mfr. Part No.BC548B A1
MYR0.534
Each (In a Pack of 250)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 146-2333
Mfr. Part No.BC548B A1
MYR0.158
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 170-4161
Mfr. Part No.BC548A A1
MYR0.163
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9710
Mfr. Part No.BC548A A1
MYR0.519
Each (In a Pack of 250)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9690
Mfr. Part No.BC546B A1
MYR0.534
Each (In a Pack of 250)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW Single 80 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 170-4155
Mfr. Part No.BC546B A1
MYR0.158
Each (On a Tape of 4000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW Single 80 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9701
Mfr. Part No.BC547C A1
MYR0.551
Each (In a Pack of 250)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 170-4158
Mfr. Part No.BC547C A1
MYR0.145
Each (On a Tape of 4000)
units
NPN 100 mA 45 V TO-92 Through Hole 500 mW Single 50 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9684
Mfr. Part No.BC338-25 A1
MYR0.621
Each (In a Pack of 250)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW Single 30 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 170-4156
Mfr. Part No.BC546A A1
MYR0.147
Each (On a Tape of 4000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW Single 80 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 146-2331
Mfr. Part No.BC338-25 A1
MYR0.199
Each (On a Tape of 4000)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW Single 30 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9697
Mfr. Part No.BC546A A1
MYR0.561
Each (In a Pack of 250)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW Single 80 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 901-4099
Mfr. Part No.TSC966CW RPG
MYR2.224
Each (In a Pack of 50)
units
NPN 300 mA 400 V SOT-223 Surface Mount 1 W Single 600 V 7 V 1 MHz 3 + Tab 1 6.5 x 3.5 x 1.65mm -
RS Stock No. 796-9678
Mfr. Part No.BC337-25 A1
MYR0.617
Each (In a Pack of 250)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW Single 50 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 170-4183
Mfr. Part No.BC848A RF
MYR0.135
Each (On a Reel of 3000)
units
NPN 100 mA 30 V SOT-23 Surface Mount 250 mW Single 30 V 5 V - 3 1 3 x 1.4 x 1.2mm -
RS Stock No. 170-4164
Mfr. Part No.BC549C A1
MYR0.147
Each (On a Tape of 4000)
units
NPN 100 mA 30 V TO-92 Through Hole 500 mW Single 30 V 6 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9782
Mfr. Part No.BC846B RF
MYR0.517
Each (In a Pack of 250)
units
NPN 100 mA 65 V SOT-23 Surface Mount 250 mW Single 80 V 6 V - 3 1 3 x 1.4 x 1.2mm -55 °C
RS Stock No. 170-4151
Mfr. Part No.BC337-16 A1
MYR0.169
Each (On a Tape of 4000)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW Single 50 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -