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. 751-5284
Mfr. Part No.ZX5T951GTA
kr 6,947
Each (In a Pack of 10)
Units
PNP 5.5 A 60 V SOT-223 Surface Mount 3 W Single -100 V -7 V 120 MHz 3 + Tab 1 6.7 x 3.7 x 1.7mm -
RS Stock No. 295-539
Mfr. Part No.ZTX753
kr 8,088
Each (In a Pack of 5)
Units
PNP 2 A 100 V E-Line Through Hole 1 W Single 120 V 5 V 140 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 922-7740
Mfr. Part No.ZTX753
kr 3,089
Each (In a Bag of 4000)
Units
PNP 2 A 100 V E-Line Through Hole 1 W Single 120 V 5 V 140 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 122-1268
Mfr. Part No.ZX5T951GTA
kr 7,077
Each (On a Reel of 1000)
Units
PNP 5.5 A 60 V SOT-223 Surface Mount 3 W Single -100 V -7 V 120 MHz 3 + Tab 1 6.7 x 3.7 x 1.7mm -
RS Stock No. 921-0849
Mfr. Part No.APT27HZTR-G1
kr 0,372
Each (In a Pack of 50)
Units
NPN - - TO-92 Through Hole 800 mW Single - - - 3 1 4.7 x 3.7 x 4.7mm -
RS Stock No. 121-9976
Mfr. Part No.FCX790ATA
kr 1,966
Each (On a Reel of 1000)
Units
PNP 2 A 40 V SOT-89 Surface Mount 2 W Single 50 V 5 V 100 MHz 3 1 1.5 x 4.5 x 2.5mm -
RS Stock No. 122-0234
Mfr. Part No.DZT5551-13
kr 1,279
Each (On a Reel of 2500)
Units
NPN 600 mA 160 V SOT-223 Surface Mount 1 W Single 180 V 6 V 300 MHz 3 + Tab 1 6.55 x 3.55 x 1.65mm -
RS Stock No. 751-4329
Mfr. Part No.DZT5551-13
kr 2,896
Each (In a Pack of 25)
Units
NPN 600 mA 160 V SOT-223 Surface Mount 1 W Single 180 V 6 V 300 MHz 3 + Tab 1 6.55 x 3.55 x 1.65mm -
RS Stock No. 122-2362
Mfr. Part No.FMMT555TA
kr 1,037
Each (On a Reel of 3000)
Units
PNP 1 A 150 V SOT-23 Surface Mount 500 mW Single -160 V -5 V 100 MHz 3 1 3.04 x 1.4 x 1.02mm -
RS Stock No. 169-7397
Mfr. Part No.LMN200B02-7
kr 0,785
Each (On a Reel of 3000)
Units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW N+P Loadswitch -50 V -5 V 200 MHz 6 2 2.2 x 1.35 x 1mm -
RS Stock No. 922-7683
Mfr. Part No.ZTX550
kr 1,871
Each (In a Bag of 4000)
Units
PNP 1 A 45 V E-Line Through Hole 1 W Single 60 V 5 V 150 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 274-942
Mfr. Part No.FZT753TA
kr 7,72
Each
Units
PNP 2 A 100 V SOT-223 Surface Mount 2 W Single 120 V 5 V 140 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -
RS Stock No. 823-1429
Mfr. Part No.FZT796ATA
kr 3,084
Each (In a Pack of 10)
Units
PNP 500 mA 200 V SOT-223 Surface Mount 2 W Single -200 V -5 V 100 MHz 3 + Tab 1 6.7 x 3.7 x 1.65mm -
RS Stock No. 263-908
Mfr. Part No.ZTX550
kr 5,74
Each (In a Pack of 5)
Units
PNP 1 A 45 V E-Line Through Hole 1 W Single 60 V 5 V 150 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 922-7715
Mfr. Part No.FZT753TA
kr 3,311
Each (On a Reel of 1000)
Units
PNP 2 A 100 V SOT-223 Surface Mount 2 W Single 120 V 5 V 140 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -
RS Stock No. 823-1378
Mfr. Part No.FMMT555TA
kr 2,981
Each (In a Pack of 50)
Units
PNP 1 A 150 V SOT-23 Surface Mount 500 mW Single -160 V -5 V 100 MHz 3 1 3.04 x 1.4 x 1.02mm -
RS Stock No. 669-7512
Mfr. Part No.FCX790ATA
kr 4,185
Each (In a Pack of 10)
Units
PNP 2 A 40 V SOT-89 Surface Mount 2 W Single 50 V 5 V 100 MHz 3 1 1.5 x 4.5 x 2.5mm -
RS Stock No. 823-1435
Mfr. Part No.LMN200B02-7
kr 0,803
Each (In a Pack of 25)
Units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW N+P Loadswitch -50 V -5 V 200 MHz 6 2 2.2 x 1.35 x 1mm -
RS Stock No. 170-9007
Mfr. Part No.APT27HZTR-G1
kr 0,36
Each (On a Tape of 2000)
Units
NPN - - TO-92 Through Hole 800 mW Single - - - 3 1 4.7 x 3.7 x 4.7mm -
RS Stock No. 169-7395
Mfr. Part No.FZT796ATA
kr 3,033
Each (On a Reel of 1000)
Units
PNP 500 mA 200 V SOT-223 Surface Mount 2 W Single -200 V -5 V 100 MHz 3 + Tab 1 6.7 x 3.7 x 1.65mm -