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. 796-9684
Mfr. Part No.BC338-25 A1
HK$1.271
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. 146-2331
Mfr. Part No.BC338-25 A1
HK$0.351
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. 796-9690
Mfr. Part No.BC546B A1
HK$1.092
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. 170-4153
Mfr. Part No.BC338-16 A1
HK$0.344
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. 170-4155
Mfr. Part No.BC546B A1
HK$0.30
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. 796-9681
Mfr. Part No.BC338-16 A1
HK$1.271
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. 796-9672
Mfr. Part No.BC337-40 A1
HK$1.271
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. 796-9694
Mfr. Part No.BC546C A1
HK$1.31
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. 170-4150
Mfr. Part No.BC337-40 A1
HK$0.351
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 -
RS Stock No. 146-2332
Mfr. Part No.BC546C A1
HK$0.323
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. 748-4991
Mfr. Part No.BC847B RF
HK$0.53
Each (In a Pack of 200)
units
NPN 100 mA 45 V SOT-23 Surface Mount 250 mW Single 50 V 6 V 100 MHz 3 1 3 x 1.4 x 1.2mm -55 °C
RS Stock No. 169-9291
Mfr. Part No.BC847B RF
HK$0.278
Each (On a Reel of 3000)
units
NPN 100 mA 45 V SOT-23 Surface Mount 250 mW Single 50 V 6 V 100 MHz 3 1 3 x 1.4 x 1.2mm -
RS Stock No. 170-4152
Mfr. Part No.BC337-25 A1
HK$0.351
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 -
RS Stock No. 796-9688
Mfr. Part No.BC338-40 A1
HK$1.339
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. 170-4154
Mfr. Part No.BC338-40 A1
HK$0.344
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. 796-9678
Mfr. Part No.BC337-25 A1
HK$1.271
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. 169-8936
Mfr. Part No.TS13003CT A3G
HK$0.641
Each (On a Tape of 1000)
units
NPN 1.5 A 400 V TO-92 Through Hole 1.5 W Single 700 V 9 V 4 MHz 3 1 4.7 x 4.7 x 3.7mm -
RS Stock No. 901-4099
Mfr. Part No.TSC966CW RPG
HK$4.614
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. 796-9707
Mfr. Part No.BC547B A1
HK$1.092
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. 170-4151
Mfr. Part No.BC337-16 A1
HK$0.344
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 -