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. 122-0234
Mfr. Part No.DZT5551-13
SGD0.216
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
SGD0.489
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 -55 °C
RS Stock No. 295-539
Mfr. Part No.ZTX753
SGD1.334
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 -55 °C
RS Stock No. 169-7397
Mfr. Part No.LMN200B02-7
SGD0.174
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. 823-1435
Mfr. Part No.LMN200B02-7
SGD0.502
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. 922-7740
Mfr. Part No.ZTX753
SGD0.502
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. 295-517
Mfr. Part No.ZTX653
SGD1.334
Each (In a Pack of 5)
units
NPN 2 A 100 V E-Line Through Hole 1 W Single 120 V 5 V 175 MHz 3 1 4.01 x 4.77 x 2.41mm -55 °C
RS Stock No. 922-7743
Mfr. Part No.ZTX653
SGD0.502
Each (In a Bag of 4000)
units
NPN 2 A 100 V E-Line Through Hole 1 W Single 120 V 5 V 175 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 922-7734
Mfr. Part No.ZTX651
SGD0.511
Each (In a Box of 4000)
units
NPN 2 A 60 V E-Line Through Hole 1 W Single 80 V 5 V 175 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 295-501
Mfr. Part No.ZTX651
SGD1.368
Each (In a Pack of 5)
units
NPN 2 A 60 V E-Line Through Hole 1 W Single 80 V 5 V 175 MHz 3 1 4.01 x 4.77 x 2.41mm -55 °C
RS Stock No. 711-5187
Mfr. Part No.ZXTP25040DFHTA
SGD0.722
Each (In a Pack of 10)
units
PNP 3 A 40 V SOT-23 Surface Mount 1.81 W Single -45 V -7 V 270 MHz 3 1 3.04 x 1.4 x 1.02mm -55 °C
RS Stock No. 922-8055
Mfr. Part No.ZXTP25040DFHTA
SGD0.349
Each (On a Reel of 3000)
units
PNP 3 A 40 V SOT-23 Surface Mount 1.81 W Single -45 V -7 V 270 MHz 3 1 3.04 x 1.4 x 1.02mm -
RS Stock No. 922-7598
Mfr. Part No.FMMT718TA
SGD0.219
Each (On a Reel of 3000)
units
PNP 1.5 A 20 V SOT-23 Surface Mount 625 mW Single 20 V 5 V 180 MHz 3 1 1 x 3.05 x 1.4mm -
RS Stock No. 751-4297
Mfr. Part No.DSS20200L-7
SGD0.252
Each (On a Tape of 100)
units
PNP 2 A 20 V SOT-23 Surface Mount 600 mW Single -20 V -7 V 100 MHz 3 1 3 x 1.4 x 1.1mm -55 °C
RS Stock No. 154-873
Mfr. Part No.FMMT718TA
SGD0.544
Each (In a Pack of 25)
units
PNP 1.5 A 20 V SOT-23 Surface Mount 625 mW Single 20 V 5 V 180 MHz 3 1 1 x 3.05 x 1.4mm -55 °C
RS Stock No. 770-5222
Mfr. Part No.ZXTN4004KTC
SGD0.557
Each (In a Pack of 10)
units
NPN 1 A 150 V DPAK (TO-252) Surface Mount 3.8 W Single 150 V 7 V - 3 1 6.7 x 2.39 x 6.2mm -55 °C
RS Stock No. 922-8389
Mfr. Part No.DSS20200L-7
SGD0.152
Each (On a Reel of 3000)
units
PNP 2 A 20 V SOT-23 Surface Mount 600 mW Single -20 V -7 V 100 MHz 3 1 3 x 1.4 x 1.1mm -
RS Stock No. 122-1479
Mfr. Part No.ZXTN4004KTC
SGD0.237
Each (On a Reel of 2500)
units
NPN 1 A 150 V DPAK (TO-252) Surface Mount 3.8 W Single 150 V 7 V - 3 1 6.7 x 2.39 x 6.2mm -
RS Stock No. 121-9551
Mfr. Part No.DSS5240T-7
SGD0.096
Each (On a Reel of 3000)
units
PNP 2 A 40 V SOT-23 Surface Mount 600 mW Single -40 V -5 V 100 MHz 3 1 3 x 1.4 x 1.1mm -
RS Stock No. 751-4307
Mfr. Part No.DSS5240T-7
SGD0.208
Each (On a Tape of 100)
units
PNP 2 A 40 V SOT-23 Surface Mount 600 mW Single -40 V -5 V 100 MHz 3 1 3 x 1.4 x 1.1mm -55 °C