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. 445-2146
Mfr. Part No.BDP949
BrandInfineon
MYR3.648
Each (In a Pack of 5)
units
NPN 3 A 60 V SOT-223 Surface Mount 5 W Single 60 V 5 V 100 MHz 3 + Tab 1 1.6 x 6.5 x 3.5mm -65 °C
RS Stock No. 911-4713
Mfr. Part No.BDP949
BrandInfineon
MYR1.468
Each (On a Reel of 1000)
units
NPN 3 A 60 V SOT-223 Surface Mount 5 W Single 60 V 5 V 100 MHz 4 1 6.5 x 3.5 x 1.6mm -
RS Stock No. 445-2219
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
MYR1.712
Each (In a Pack of 10)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW Single 20 V 2.5 V 5000 MHz 3 1 1 x 2.9 x 1.3mm -65 °C
RS Stock No. 166-0863
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
MYR0.44
Each (On a Reel of 3000)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW Single 20 V 2.5 V 5000 MHz 3 1 1 x 2.9 x 1.3mm -
RS Stock No. 145-9446
Mfr. Part No.BC817K40WH6327XTSA1
BrandInfineon
MYR0.18
Each (On a Reel of 3000)
units
NPN 500 mA 45 V SOT-323 (SC-70) Surface Mount 250 mW Single 50 V 5 V 170 MHz 3 1 2 x 1.25 x 0.8mm -
RS Stock No. 145-8821
Mfr. Part No.SMBT2222AE6327HTSA1
BrandInfineon
MYR0.18
Each (On a Reel of 3000)
units
NPN 600 mA 40 V SOT-23 Surface Mount 330 mW Single 75 V 6 V 300 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 825-9294
Mfr. Part No.SMBT2222AE6327HTSA1
BrandInfineon
MYR0.372
Each (In a Pack of 200)
units
NPN 600 mA 40 V SOT-23 Surface Mount 330 mW Single 75 V 6 V 300 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 752-7903
Mfr. Part No.BC817K40WH6327XTSA1
BrandInfineon
MYR0.303
Each (In a Pack of 100)
units
NPN 500 mA 45 V SOT-323 (SC-70) Surface Mount 250 mW Single 50 V 5 V 170 MHz 3 1 2 x 1.25 x 0.8mm -
RS Stock No. 857-8756
Mfr. Part No.SMBTA56E6433HTMA1
BrandInfineon
MYR0.168
Each (On a Reel of 10000)
units
PNP 500 mA 80 V SOT-23 Surface Mount 330 mW Single -80 V -4 V 100 MHz 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 145-8844
Mfr. Part No.BFP740ESDH6327XTSA1
BrandInfineon
MYR1.037
Each (On a Reel of 3000)
units
NPN 45 mA 4.9 V SOT-343 Surface Mount 160 mW Single 3 V 0.5 V 45 GHz 4 1 2 x 1.25 x 0.9mm -
RS Stock No. 145-8795
Mfr. Part No.BCM846SH6327XTSA1
BrandInfineon
MYR0.294
Each (On a Reel of 3000)
units
NPN 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW Isolated 80 V 6 V 250 MHz 6 2 2 x 1.25 x 0.8mm -
RS Stock No. 166-0846
Mfr. Part No.BFQ19SH6327XTSA1
BrandInfineon
MYR1.183
Each (On a Reel of 1000)
units
NPN 75 mA 15 V SOT-89 Surface Mount 1 W Single 20 V 3 V 1.5 GHz 3 1 1.5 x 4.5 x 2.5mm -
RS Stock No. 166-1081
Mfr. Part No.BCR505E6327HTSA1
BrandInfineon
MYR0.379
Each (On a Reel of 3000)
units
NPN 500 mA 50 V SOT-23 Surface Mount - Single - - - 3 - 1 x 2.9 x 1.3mm -
RS Stock No. 145-9476
Mfr. Part No.BCX5616H6327XTSA1
BrandInfineon
MYR0.66
Each (On a Reel of 1000)
units
NPN 1 A 80 V SOT-89 Surface Mount 2 W Single 100 V 5 V 100 MHz 3 1 4.5 x 2.5 x 1.5mm -
RS Stock No. 752-7981
Mfr. Part No.BCR116SH6327XTSA1
BrandInfineon
MYR0.449
Each (In a Pack of 50)
units
NPN - 50 V SOT-363 (SC-88) Surface Mount 250 mW Isolated - - - 6 2 2 x 1.25 x 0.8mm -
RS Stock No. 145-9449
Mfr. Part No.BCX53H6327XTSA1
BrandInfineon
MYR0.56
Each (On a Reel of 1000)
units
PNP 1 A 80 V SOT-89 Surface Mount 2 W Single 100 V 5 V 125 MHz 3 1 4.5 x 2.5 x 1.6mm -
RS Stock No. 752-7971
Mfr. Part No.BCP5616H6327XTSA1
BrandInfineon
MYR2.058
Each (In a Pack of 25)
units
NPN 1 A 80 V SOT-223 Surface Mount 2 W Single 100 V 5 V 100 MHz 3 + Tab 1 6.5 x 3.5 x 1.6mm -
RS Stock No. 911-4760
Mfr. Part No.BCR116SH6327XTSA1
BrandInfineon
MYR0.308
Each (On a Reel of 3000)
units
NPN - 50 V SOT-363 (SC-88) Surface Mount 250 mW Isolated - - - 6 2 2 x 1.25 x 0.8mm -
RS Stock No. 752-8101
Mfr. Part No.BCX53H6327XTSA1
BrandInfineon
MYR1.083
Each (In a Pack of 25)
units
PNP 1 A 80 V SOT-89 Surface Mount 2 W Single 100 V 5 V 125 MHz 3 1 4.5 x 2.5 x 1.6mm -
RS Stock No. 288-339
Mfr. Part No.BFQ19SH6327XTSA1
BrandInfineon
MYR2.63
Each
units
NPN 75 mA 15 V SOT-89 Surface Mount 1 W Single 20 V 3 V 1.5 GHz 3 1 1.5 x 4.5 x 2.5mm -65 °C