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. 166-0433
Mfr. Part No.BFQ18A,115
BrandNXP
MYR2.243
Each (On a Reel of 1000)
units
NPN 150 mA 18 V UPAK Surface Mount 1 W Single 25 V 2 V 4000 MHz 4 1 1.6 x 4.6 x 2.6mm -
RS Stock No. 165-8721
Mfr. Part No.BFU725F/N1
BrandNXP
MYR0.654
Each (On a Reel of 3000)
units
NPN 40 mA 2.8 V SOT-343F Surface Mount 136 mW Single 10 V 1 V 12 GHz 4 1 2.2 x 1.35 x 1mm -
RS Stock No. 816-7801
Mfr. Part No.BFU725F/N1
BrandNXP
MYR0.802
Each (In a Pack of 30)
units
NPN 40 mA 2.8 V SOT-343F Surface Mount 136 mW Single 10 V 1 V 12 GHz 4 1 2.2 x 1.35 x 1mm -
RS Stock No. 626-2715
Mfr. Part No.BFQ18A,115
BrandNXP
MYR2.624
Each (In a Pack of 5)
units
NPN 150 mA 18 V UPAK Surface Mount 1 W Single 25 V 2 V 4000 MHz 4 1 1.6 x 4.6 x 2.6mm -65 °C
RS Stock No. 792-0872
Mfr. Part No.BLT81,115
BrandNXP
MYR6.105
Each (On a Reel of 2)
units
NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W Single 20 V 2.5 V 900 MHz 3 + Tab 1 6.7 x 3.7 x 1.8mm -
RS Stock No. 626-3342
Mfr. Part No.PRF957,115
BrandNXP
MYR0.755
Each (In a Pack of 10)
units
NPN 100 mA 10 V UMT Surface Mount 270 mW Single 20 V 1.5 V 8500 MHz 3 1 1 x 2.2 x 1.35mm -65 °C
RS Stock No. 165-9834
Mfr. Part No.BLT81,115
BrandNXP
MYR6.67
Each (On a Reel of 1000)
units
NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W Single 20 V 2.5 V 900 MHz 3 + Tab 1 6.7 x 3.7 x 1.8mm -
RS Stock No. 179-1060
Mfr. Part No.BFT25A,215
BrandNXP
MYR1.376
Each (On a Reel of 3000)
units
NPN 7 mA 5 V SOT-23 (TO-236AB) Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 3 x 1.4mm -
RS Stock No. 626-2793
Mfr. Part No.BFS25A,115
BrandNXP
MYR0.648
Each (In a Pack of 10)
units
NPN 7 mA 5 V UMT Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 2.2 x 1.35mm -65 °C
RS Stock No. 626-2838
Mfr. Part No.BFT25A,215
BrandNXP
MYR1.943
Each (In a Pack of 10)
units
NPN 7 mA 5 V SOT-23 (TO-236AB) Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 166-0540
Mfr. Part No.BFG325W/XR,115
BrandNXP
MYR0.693
Each (On a Reel of 3000)
units
NPN 35 mA 6 V CMPAK Surface Mount 210 mW Single 15 V 2 V 14000 MHz 4 1 1 x 2.2 x 1.35mm -
RS Stock No. 166-0549
Mfr. Part No.PRF957,115
BrandNXP
MYR0.624
Each (On a Reel of 3000)
units
NPN 100 mA 10 V UMT Surface Mount 270 mW Single 20 V 1.5 V 8500 MHz 3 1 1 x 2.2 x 1.35mm -
RS Stock No. 166-0543
Mfr. Part No.BFS25A,115
BrandNXP
MYR0.693
Each (On a Reel of 3000)
units
NPN 7 mA 5 V UMT Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 2.2 x 1.35mm -
RS Stock No. 626-2535
Mfr. Part No.BFG325W/XR,115
BrandNXP
MYR0.785
Each (In a Pack of 10)
units
NPN 35 mA 6 V CMPAK Surface Mount 210 mW Single 15 V 2 V 14000 MHz 4 1 1 x 2.2 x 1.35mm -65 °C