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. 508-412
Mfr. Part No.BCP53-10,115
BrandNexperia
MYR0.921
Each (In a Pack of 50)
units
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W Single 100 V 5 V 145 MHz 4 1 1.7 x 6.7 x 3.7mm -65 °C
RS Stock No. 166-1318
Mfr. Part No.BCP53-10,115
BrandNexperia
MYR0.321
Each (On a Reel of 1000)
units
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W Single 100 V 5 V 145 MHz 4 1 1.7 x 6.7 x 3.7mm -
RS Stock No. 166-1340
Mfr. Part No.PDTD123TT,215
BrandNexperia
MYR0.262
Each (On a Reel of 3000)
units
NPN - 50 V SOT-23 (TO-236AB) Surface Mount - Single - 5 V - 3 1 3 x 1.4 x 1mm -
RS Stock No. 508-545
Mfr. Part No.PDTD123TT,215
BrandNexperia
MYR1.10
Each (In a Pack of 50)
units
NPN - 50 V SOT-23 (TO-236AB) Surface Mount - Single - 5 V - 3 1 3 x 1.4 x 1mm -65 °C
RS Stock No. 484-5122
Mfr. Part No.BCP53-16,115
BrandNexperia
MYR1.16
Each (In a Pack of 25)
units
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W Single 100 V 5 V 145 MHz 4 1 1.7 x 6.7 x 3.7mm -65 °C
RS Stock No. 518-3295
Mfr. Part No.PEMD10,115
BrandNexperia
MYR1.10
Each (In a Pack of 50)
units
NPN + PNP - 50 V SSMini Surface Mount - Isolated - 10 V - 6 2 1.7 x 1.3 x 0.6mm -65 °C
RS Stock No. 725-8486
Mfr. Part No.PDTC144ET,215
BrandNexperia
MYR0.202
Each (On a Tape of 200)
units
NPN - 50 V SOT-23 Surface Mount 250 mW Single - 10 V - 3 1 3 x 1.4 x 1mm -65 °C
RS Stock No. 166-0405
Mfr. Part No.BCP53-16,115
BrandNexperia
MYR0.409
Each (On a Reel of 1000)
units
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W Single 100 V 5 V 145 MHz 4 1 1.7 x 6.7 x 3.7mm -
RS Stock No. 169-0634
Mfr. Part No.PMBS3906,215
BrandNexperia
MYR0.146
Each (On a Reel of 3000)
units
PNP 100 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 40 V 5 V - 3 1 1 x 3 x 1.4mm -
RS Stock No. 518-3835
Mfr. Part No.PUMH10,115
BrandNexperia
MYR0.517
Each (In a Pack of 50)
units
NPN - 50 V SOT-363 (SC-88) Surface Mount - Isolated - 10 V - 6 2 2.2 x 1.35 x 1mm -65 °C
RS Stock No. 166-0601
Mfr. Part No.PEMD10,115
BrandNexperia
MYR0.259
Each (On a Reel of 4000)
units
NPN + PNP - 50 V SSMini Surface Mount - Isolated - 10 V - 6 2 1.7 x 1.3 x 0.6mm -
RS Stock No. 725-8629
Mfr. Part No.PMBS3906,215
BrandNexperia
MYR0.20
Each (In a Pack of 100)
units
PNP 100 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 40 V 5 V - 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 166-0373
Mfr. Part No.PUMH10,115
BrandNexperia
MYR0.157
Each (On a Reel of 3000)
units
NPN - 50 V SOT-363 (SC-88) Surface Mount - Isolated - 10 V - 6 2 2.2 x 1.35 x 1mm -
RS Stock No. 166-0494
Mfr. Part No.PDTC144ET,215
BrandNexperia
MYR0.097
Each (On a Reel of 3000)
units
NPN - 50 V SOT-23 Surface Mount 250 mW Single - 10 V - 3 1 3 x 1.4 x 1mm -
RS Stock No. 166-0509
Mfr. Part No.PBSS4140T,215
BrandNexperia
MYR0.352
Each (On a Reel of 3000)
units
NPN 1 A 40 V SOT-23 (TO-236AB) Surface Mount 450 mW Single 40 V 5 V 150 MHz 3 1 1 x 3 x 1.4mm -
RS Stock No. 518-3706
Mfr. Part No.PUMD13,115
BrandNexperia
MYR0.493
Each (In a Pack of 50)
units
NPN + PNP - 50 V SOT-363 (SC-88) Surface Mount - Isolated - 10 V - 6 2 2.2 x 1.35 x 1mm -65 °C
RS Stock No. 170-7962
Mfr. Part No.BC857C,235
BrandNexperia
MYR0.066
Each (On a Reel of 10000)
units
PNP 100 mA -45 V SOT-23 Surface Mount 250 mW Single -50 V -5 V - 3 1 3 x 1.4 x 1mm -
RS Stock No. 508-236
Mfr. Part No.BC857C,215
BrandNexperia
MYR0.159
Each (In a Pack of 100)
units
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 -65 °C
RS Stock No. 518-1508
Mfr. Part No.PBSS4140T,215
BrandNexperia
MYR0.953
Each (In a Pack of 25)
units
NPN 1 A 40 V SOT-23 (TO-236AB) Surface Mount 450 mW Single 40 V 5 V 150 MHz 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 146-0364
Mfr. Part No.BC846S,115
BrandNexperia
MYR0.192
Each (On a Reel of 3000)
units
NPN 100 mA 65 V SOT-363 (SC-88) Surface Mount 20 mW Isolated 80 V 65 V - 6 2 2.1 x 1.35 x 1mm -