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. 170-7962
Mfr. Part No.BC857C,235
BrandNexperia
HK$0.144
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. 438-4598
Mfr. Part No.BCP53,115
BrandNexperia
HK$0.899
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 -65 °C
RS Stock No. 508-236
Mfr. Part No.BC857C,215
BrandNexperia
HK$0.422
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. 112-5475
Mfr. Part No.PZT2907A,115
BrandNexperia
HK$3.958
Each (In a Pack of 5)
units
PNP 600 mA 60 V SOT-223 (SC-73) Surface Mount 1.15 W Single 60 V 5 V 200 MHz 4 1 1.7 x 6.7 x 3.7mm -65 °C
RS Stock No. 166-1312
Mfr. Part No.BC857C,215
BrandNexperia
HK$0.189
Each (On a Reel of 3000)
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 -
RS Stock No. 112-5469
Mfr. Part No.PZT2222A,115
BrandNexperia
HK$4.17
Each
units
NPN 600 mA 40 V SOT-223 (SC-73) Surface Mount 1.15 W Single 75 V 6 V 300 MHz 4 1 1.7 x 6.7 x 3.7mm -65 °C
RS Stock No. 178-7164
Mfr. Part No.BCX70H,215
BrandNexperia
HK$0.269
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 801-5580
Mfr. Part No.PBHV9115X,115
BrandNexperia
HK$2.946
Each (In a Pack of 10)
units
PNP 1 A 150 V SOT-89 Surface Mount 1.5 W Single -200 V -6 V 100 MHz 3 1 4.6 x 2.6 x 1.6mm -
RS Stock No. 792-1061
Mfr. Part No.PDTB123YT,215
BrandNexperia
HK$1.166
Each (On a Tape of 100)
units
PNP - 50 V SOT-23 Surface Mount 250 mW Single - 5 V - 3 1 3 x 1.4 x 1.1mm -65 °C
RS Stock No. 165-9995
Mfr. Part No.PBHV9115X,115
BrandNexperia
HK$1.635
Each (On a Reel of 1000)
units
PNP 1 A 150 V SOT-89 Surface Mount 1.5 W Single -200 V -6 V 100 MHz 3 1 4.6 x 2.6 x 1.6mm -
RS Stock No. 484-5194
Mfr. Part No.BCX70H,215
BrandNexperia
HK$1.47
Each (In a Pack of 50)
units
NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 45 V 5 V 250 MHz 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 179-1079
Mfr. Part No.MMBT3904,215
BrandNexperia
HK$0.134
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 103-7565
Mfr. Part No.PBSS4350T,215
BrandNexperia
HK$0.837
Each (On a Reel of 3000)
units
NPN 2 A 50 V SOT-23 (TO-236AB) Surface Mount 1.2 W Single 50 V 5 V 100 MHz 3 1 1 x 3 x 1.4mm -
RS Stock No. 166-1368
Mfr. Part No.PMBT4401,215
BrandNexperia
HK$0.227
Each (On a Reel of 3000)
units
NPN 600 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 60 V 6 V 250 MHz 3 1 1 x 3 x 1.4mm -
RS Stock No. 168-9634
Mfr. Part No.PBSS4240Y,115
BrandNexperia
HK$0.687
Each (On a Reel of 3000)
units
NPN 2 A 40 V UMT Surface Mount 430 mW Single 40 V 5 V 230 MHz 6 1 1 x 2.2 x 1.35mm -
RS Stock No. 510-015
Mfr. Part No.PMBT4401,215
BrandNexperia
HK$1.014
Each (In a Pack of 50)
units
NPN 600 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 60 V 6 V 250 MHz 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 725-8616
Mfr. Part No.MMBT3904,215
BrandNexperia
HK$0.868
Each (In a Pack of 50)
units
NPN 200 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 60 V 6 V - 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 518-1592
Mfr. Part No.PBSS4240Y,115
BrandNexperia
HK$2.184
Each (In a Pack of 10)
units
NPN 2 A 40 V UMT Surface Mount 430 mW Single 40 V 5 V 230 MHz 6 1 1 x 2.2 x 1.35mm -65 °C
RS Stock No. 518-1671
Mfr. Part No.PBSS4350T,215
BrandNexperia
HK$2.51
Each (In a Pack of 10)
units
NPN 2 A 50 V SOT-23 (TO-236AB) Surface Mount 1.2 W Single 50 V 5 V 100 MHz 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 178-7052
Mfr. Part No.BCX56-10,115
BrandNexperia
HK$0.694
Each (On a Reel of 1000)
units
NPN 1 A 80 V SOT-89 Surface Mount 1.35 W Single 100 V 5 V 180 MHz 3 1 4.6 x 2.6 x 1.6mm -