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 Prix 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
N° de stock RS 166-0540
Référence fabricantBFG325W/XR,115
MarqueNXP
0,076 €
Each (On a Reel of 3000)
Unité
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 -
N° de stock RS 792-0872
Référence fabricantBLT81,115
MarqueNXP
1,63 €
Each (On a Reel of 2)
Unité
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 -
N° de stock RS 626-2715
Référence fabricantBFQ18A,115
MarqueNXP
0,686 €
Each (In a Pack of 5)
Unité
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 -
N° de stock RS 626-2838
Référence fabricantBFT25A,215
MarqueNXP
0,412 €
Each (In a Pack of 10)
Unité
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 -
N° de stock RS 816-7801
Référence fabricantBFU725F/N1
MarqueNXP
0,229 €
Each (In a Pack of 30)
Unité
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 -
N° de stock RS 626-2535
Référence fabricantBFG325W/XR,115
MarqueNXP
0,077 €
Each (In a Pack of 10)
Unité
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 -
N° de stock RS 509-453
Référence fabricantPMD9003D,115
MarqueNXP
0,138 €
Each (In a Pack of 20)
Unité
NPN - 50 V TSOP Surface Mount - - - 10 V - 6 2 3.1 x 1.7 x 1mm -
N° de stock RS 165-9834
Référence fabricantBLT81,115
MarqueNXP
1,329 €
Each (On a Reel of 1000)
Unité
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 -
N° de stock RS 179-1060
Référence fabricantBFT25A,215
MarqueNXP
0,18 €
Each (On a Reel of 3000)
Unité
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 -
N° de stock RS 166-0543
Référence fabricantBFS25A,115
MarqueNXP
0,185 €
Each (On a Reel of 3000)
Unité
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 -
N° de stock RS 166-0433
Référence fabricantBFQ18A,115
MarqueNXP
0,536 €
Each (On a Reel of 1000)
Unité
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 -
N° de stock RS 725-8489
Référence fabricantPDTA114EE,115
MarqueNXP
0,066 €
Each (In a Pack of 200)
Unité
PNP - 50 V SOT-416 (SC-75) Surface Mount 150 mW Single - 10 V - 3 1 1.8 x 0.9 x 0.85mm -
N° de stock RS 165-8721
Référence fabricantBFU725F/N1
MarqueNXP
0,115 €
Each (On a Reel of 3000)
Unité
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 -
N° de stock RS 725-8483
Référence fabricantPDTC114EE,115
MarqueNXP
0,07 €
Each (In a Pack of 200)
Unité
NPN - 50 V SOT-416 (SC-75) Surface Mount 150 mW Single - 10 V - 3 1 1.8 x 0.9 x 0.85mm -
N° de stock RS 626-2793
Référence fabricantBFS25A,115
MarqueNXP
0,222 €
Each (In a Pack of 10)
Unité
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 -
N° de stock RS 626-3342
Référence fabricantPRF957,115
MarqueNXP
0,066 €
Each (In a Pack of 10)
Unité
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 -
N° de stock RS 166-0549
Référence fabricantPRF957,115
MarqueNXP
0,069 €
Each (On a Reel of 3000)
Unité
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 -