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 166-1312
Référence fabricantBC857C,215
MarqueNexperia
0,016 €
Each (On a Reel of 3000)
Unité
PNP 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 50 V 5 V 100 MHz 3 1 1 x 3 x 1.4mm -
N° de stock RS 890-2682
Référence fabricant2SC5200-O(S1,F,S)
MarqueToshiba
2,388 €
Each (In a Pack of 5)
Unité
NPN 15 A 230 V TO-3PL Through Hole 150 W Single 230 V 5 V - 3 1 20.5 x 26 x 5.2mm -
N° de stock RS 122-0085
Référence fabricant2N3773G
3,863 €
Each (In a Tray of 100)
Unité
NPN 16 A 140 V TO-204 Through Hole 150 W Single 160 V 7 V - 3 1 8.51 x 39.37 x 26.67mm -
N° de stock RS 671-1116
Référence fabricantBC33725TA
0,185 €
Each (In a Pack of 10)
Unité
NPN 800 mA 45 V TO-92 Through Hole 625 mW Single - 5 V 100 MHz 3 1 5.33 x 5.2 x 4.19mm -
N° de stock RS 544-9270
Référence fabricant2N3773G
5,75 €
Each
Unité
NPN 16 A 140 V TO-204 Through Hole 150 W Single 160 V 7 V - 3 1 8.51 x 39.37 x 26.67mm -
N° de stock RS 251-3564
Référence fabricantTIP35C
1,70 €
Each
Unité
NPN 25 A 100 V TO-247 Through Hole 125 W Single 100 V 5 V 3 MHz 3 1 20.15 x 15.75 x 5.15mm -
N° de stock RS 790-5441
Référence fabricantNJVMJB44H11T4G
0,48 €
Each (In a Pack of 5)
Unité
NPN 10 A 80 V D2PAK (TO-263) Surface Mount 50 W Single 10 V dc 5 V 20 MHz 3 1 10.29 x 11.05 x 4.83mm -
N° de stock RS 178-7544
Référence fabricantBC33725TAR
0,036 €
Each (In a Bag of 2000)
Unité
- - - - - - - - - - - - - -
N° de stock RS 544-9270A
Référence fabricant2N3773G
5,479 €
Each (In a Pack of 50)
Unité
NPN 16 A 140 V TO-204 Through Hole 150 W Single 160 V 7 V - 3 1 8.51 x 39.37 x 26.67mm -
N° de stock RS 508-236
Référence fabricantBC857C,215
MarqueNexperia
0,04 €
Each (In a Pack of 100)
Unité
PNP 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 50 V 5 V 100 MHz 3 1 1 x 3 x 1.4mm -
N° de stock RS 170-7962
Référence fabricantBC857C,235
MarqueNexperia
0,006 €
Each (On a Reel of 10000)
Unité
PNP 100 mA -45 V SOT-23 Surface Mount 250 mW Single -50 V -5 V - 3 1 3 x 1.4 x 1mm -
N° de stock RS 803-1068
Référence fabricantBC33725TAR
0,071 €
Each (In a Pack of 200)
Unité
NPN 800 mA 50 V TO-92 Through Hole 625 mW Single 10 V 5 V 50 MHz 3 1 4.58 x 3.86 x 4.58mm -
N° de stock RS 124-1731
Référence fabricantBC33725TA
0,043 €
Each (On a Reel of 2000)
Unité
NPN 800 mA 45 V TO-92 Through Hole 625 mW Single - 5 V 100 MHz 3 1 5.33 x 5.2 x 4.19mm -
N° de stock RS 169-8605
Référence fabricantBC33725TFR
0,046 €
Each (On a Reel of 2000)
Unité
NPN 800 mA 50 V TO-92 Through Hole 625 mW Single 10 V 5 V 50 MHz 3 1 4.58 x 3.86 x 4.58mm -
N° de stock RS 162-9597
Référence fabricantNJVMJB44H11T4G
0,472 €
Each (On a Reel of 800)
Unité
NPN 10 A 80 V D2PAK (TO-263) Surface Mount 50 W Single 10 V dc 5 V 20 MHz 3 1 10.29 x 11.05 x 4.83mm -
N° de stock RS 168-6056
Référence fabricantTIP35C
1,438 €
Each (In a Tube of 30)
Unité
NPN 25 A 100 V TO-247 Through Hole 125 W Single 100 V 5 V 3 MHz 3 1 20.15 x 15.75 x 5.15mm -
N° de stock RS 842-8015
Référence fabricant2N3904BU
0,033 €
Each (In a Bag of 1000)
Unité
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm -
N° de stock RS 125-0066
Référence fabricantMJ21193G
4,251 €
Each (In a Tray of 100)
Unité
PNP 16 A 250 V TO-204AA Through Hole 250 W Single -400 V -5 V - 2 1 39.37 x 26.67 x 8.51mm -
N° de stock RS 215-6638
Référence fabricantFZT853TA
MarqueDiodesZetex
0,80 €
Each
Unité
NPN 6 A 100 V SOT-223 Surface Mount 3 W Single 200 V 6 V 130 MHz 3 + Tab 1 1.65 x 6.55 x 3.55mm -
N° de stock RS 805-1043
Référence fabricant2N3904TAR
0,051 €
Each (In a Pack of 200)
Unité
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm -