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. 179-1049
Mfr. Part No.PUMD9,115
BrandNexperia
MYR0.157
Each (On a Reel of 3000)
units
NPN + PNP - 50 V UMT Surface Mount - Isolated - 10 V - 6 2 2.2 x 1.35 x 1mm -
RS Stock No. 166-0355
Mfr. Part No.BCX52-10,115
BrandNexperia
MYR0.37
Each (On a Reel of 1000)
units
PNP 1 A 60 V SOT-89 Surface Mount 1.35 W Single -60 V -5 V 145 MHz 3 1 4.6 x 2.6 x 1.6mm -
New
RS Stock No. 215-9560
Mfr. Part No.2SA1577T106Q
BrandROHM
MYR0.234
Each (On a Reel of 3000)
units
PNP 500 A -32 V SOT-323 Surface Mount - - - - - 3 1 - -
RS Stock No. 827-5110
Mfr. Part No.BFP740H6327XTSA1
BrandInfineon
MYR1.597
Each (In a Pack of 25)
units
NPN 30 mA 4 V SOT-343 Surface Mount 160 mW Single 13 V 1.2 V 42 GHz 4 1 2 x 1.25 x 0.9mm -65 °C
RS Stock No. 124-6886
Mfr. Part No.SST2222AT116
BrandROHM
MYR0.321
Each (In a Pack of 100)
units
NPN 600 mA 40 V SST Surface Mount 350 mW - 75 V 6 V 300 MHz 3 1 2.9 x 1.3 x 0.95mm -
RS Stock No. 725-8619
Mfr. Part No.MMBT3906,215
BrandNexperia
MYR0.483
Each (On a Tape of 50)
units
PNP 200 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 40 V 6 V - 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 124-6437
Mfr. Part No.2SC2412KT146Q
BrandROHM
MYR0.25
Each (In a Pack of 150)
units
NPN 150 mA 50 V SOT-346 Surface Mount 200 mW Single 60 V 7 V 180 MHz 3 1 3 x 1.8 x 1.2mm -
RS Stock No. 168-1904
Mfr. Part No.DTA143ZETL
BrandROHM
MYR0.417
Each (In a Pack of 200)
units
PNP 100 mA - SOT-416 Surface Mount 150 mW Single - - 250 MHz 3 1 1.7 x 0.9 x 0.7mm -
RS Stock No. 484-2577
Mfr. Part No.BSP19,115
BrandNexperia
MYR2.172
Each (In a Pack of 5)
units
NPN 100 mA 350 V SOT-223 (SC-73) Surface Mount 1.2 W Single 400 V 5 V 70 MHz 4 1 1.7 x 6.7 x 3.7mm -65 °C
RS Stock No. 166-1071
Mfr. Part No.STN93003
MYR0.868
Each (On a Reel of 1000)
units
PNP 1.5 A 400 V SOT-223 Surface Mount 1.6 W Single - 5 V - 3 + Tab 1 1.8 x 6.5 x 3.5mm -
RS Stock No. 122-2365
Mfr. Part No.FMMTL718TA
MYR0.704
Each (On a Reel of 3000)
units
PNP 1 A 20 V SOT-23 Surface Mount 500 mW Single -20 V -5 V 265 MHz 3 1 3 x 1.4 x 1.1mm -
RS Stock No. 122-2346
Mfr. Part No.DXT2010P5-13
MYR1.24
Each (On a Reel of 5000)
units
NPN 6 A 60 V PowerDI 5 Surface Mount 3.2 W Single 150 V 7 V 130 MHz 3 1 4.05 x 5.45 x 1.15mm -
RS Stock No. 725-8528
Mfr. Part No.BC848B,215
BrandNexperia
MYR0.178
Each (On a Tape of 200)
units
NPN 100 mA 30 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 30 V 5 V - 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 178-7160
Mfr. Part No.PMBT2369,215
BrandNexperia
MYR0.105
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 807-5125
Mfr. Part No.BCW71
MYR0.275
Each (On a Tape of 200)
units
NPN 500 mA 45 V SOT-23 Surface Mount 350 mW Single 50 V 5 V 330 MHz 3 1 2.92 x 1.3 x 0.93mm -
RS Stock No. 145-3603
Mfr. Part No.BC847AWT1G
MYR0.102
Each (On a Reel of 3000)
units
NPN 100 mA 45 V SOT-323 (SC-70) Surface Mount 150 mW Single 50 V 6 V 100 MHz 3 1 2.2 x 1.35 x 0.9mm -
RS Stock No. 436-7896
Mfr. Part No.BC807-25,215
BrandNexperia
MYR0.354
Each (In a Pack of 50)
units
PNP 500 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 50 V 5 V 80 MHz 3 1 1 x 3 x 1.4mm -65 °C
RS Stock No. 475-9790
Mfr. Part No.2SC5658T2LR
BrandROHM
MYR0.519
Each (In a Pack of 100)
units
NPN 150 mA 50 V VMT Surface Mount 150 mW Single 60 V 7 V 180 MHz 3 1 0.5 x 1.2 x 0.8mm -55 °C
RS Stock No. 166-3385
Mfr. Part No.BCP55
MYR0.537
Each (On a Reel of 4000)
units
NPN 1.5 A 60 V SOT-223 Surface Mount 1.5 W Single 60 V 5 V - 3 + Tab 1 6.5 x 3.5 x 1.6mm -
RS Stock No. 121-9418
Mfr. Part No.FZT649TA
MYR0.892
Each (On a Reel of 1000)
units
NPN 3 A 25 V SOT-223 Surface Mount 2 W Single 35 V 5 V 240 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -