BJT & Bipolar Transistors

A Bipolar Transistor or BJT (Bipolar Junction Transistor) is a solid state, three-pin device made from three layers of silicon. A BJT 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
A bipolar transistor is made 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.
What does a bipolar transistor do?
As we said before a bipolar transistor has 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.
Types of transistor
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.
Where are bipolar transistors used?
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 Minimum DC Current Gain Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Automotive Standard
RS Stock No. 445-2023
Mfr. Part No.BC847CE6327HTSA1
BrandInfineon
HK$1.632
Each (In a Pack of 50)
units
NPN 100 mA 45 V SOT-23 Surface Mount 330 mW 420 Single 50 V 6 V 250 MHz 3 1 -
RS Stock No. 445-2073
Mfr. Part No.BCR505E6327HTSA1
BrandInfineon
HK$2.556
Each (In a Pack of 25)
units
NPN 500 mA 50 V SOT-23 Surface Mount - 70 Single - - - 3 - -
RS Stock No. 823-5529
Mfr. Part No.BCX5616H6327XTSA1
BrandInfineon
HK$2.49
Each (In a Pack of 50)
units
NPN 1 A 80 V SOT-89 Surface Mount 2 W 100 Single 100 V 5 V 100 MHz 3 1 -
RS Stock No. 445-2225
Mfr. Part No.BFR93AE6327HTSA1
BrandInfineon
HK$2.299
Each (In a Pack of 10)
units
NPN 90 mA 12 V SOT-23 Surface Mount 300 mW 70 Single 20 V 2 V 6000 MHz 3 1 -
RS Stock No. 166-1081
Mfr. Part No.BCR505E6327HTSA1
BrandInfineon
HK$0.653
Each (On a Reel of 3000)
units
NPN 500 mA 50 V SOT-23 Surface Mount - 70 Single - - - 3 - -
RS Stock No. 145-9476
Mfr. Part No.BCX5616H6327XTSA1
BrandInfineon
HK$1.28
Each (On a Reel of 1000)
units
NPN 1 A 80 V SOT-89 Surface Mount 2 W 100 Single 100 V 5 V 100 MHz 3 1 -
RS Stock No. 166-0863
Mfr. Part No.BFR92PE6327HTSA1
BrandInfineon
HK$0.652
Each (On a Reel of 3000)
units
NPN 45 mA 15 V SOT-23 Surface Mount 280 mW 70 Single 20 V 2.5 V 5000 MHz 3 1 -
RS Stock No. 653-2430
Mfr. Part No.BFP405H6327XTSA1
BrandInfineon
HK$4.23
Each (In a Pack of 5)
units
NPN 25 mA 4.5 V SOT-343 Surface Mount 75 mW 60 Single 15 V 1.5 V 25000 MHz 4 1 -
RS Stock No. 826-8992
Mfr. Part No.BFP840ESDH6327XTSA1
BrandInfineon
HK$3.28
Each (In a Pack of 50)
units
NPN 35 mA 2.25 V SOT-343 Surface Mount 75 mW 150 Single 2.9 V - 80 GHz 4 1 -
RS Stock No. 825-9294
Mfr. Part No.SMBT2222AE6327HTSA1
BrandInfineon
HK$0.551
Each (In a Pack of 200)
units
NPN 600 mA 40 V SOT-23 Surface Mount 330 mW 100 Single 75 V 6 V 300 (Min.) MHz 3 1 -
RS Stock No. 857-8435
Mfr. Part No.BF888H6327XTSA1
BrandInfineon
HK$1.49
Each (On a Reel of 3000)
units
NPN 30 mA 4 V SOT-343 Surface Mount 160 mW 250 Single 13 V 1.2 V 47 GHz 4 1 -
RS Stock No. 145-8793
Mfr. Part No.BC848CWH6327XTSA1
BrandInfineon
HK$0.196
Each (On a Reel of 3000)
units
NPN 100 mA 30 V SOT-323 (SC-70) Surface Mount 250 mW 420 Single 30 V 6 V 250 MHz 3 1 -
RS Stock No. 826-9364
Mfr. Part No.BFR193WH6327XTSA1
BrandInfineon
HK$1.07
Each (In a Pack of 100)
units
NPN 80 mA 12 V SOT-323 (SC-70) Surface Mount 580 mW 70 Single 20 V 2 V 8 GHz 3 1 -
RS Stock No. 857-8214
Mfr. Part No.BC857SH6433XTMA1
BrandInfineon
HK$0.394
Each (On a Reel of 10000)
units
PNP 100 mA 45 V SOT-363 (SC-88) Surface Mount 250 mW 200 Isolated -50 V -5 V 250 MHz 6 2 -
RS Stock No. 145-8794
Mfr. Part No.BC857CWH6327XTSA1
BrandInfineon
HK$0.196
Each (On a Reel of 3000)
units
PNP 100 mA 45 V SOT-323 (SC-70) Surface Mount 250 mW 420 Single 50 V 5 V 250 MHz 3 1 -
RS Stock No. 897-7425
Mfr. Part No.BFP540H6327XTSA1
BrandInfineon
HK$4.101
Each (In a Pack of 20)
units
NPN 80 mA 14 V SOT-343 Surface Mount 250 mW 50 Single 14 V 1 V - 4 1 -
RS Stock No. 892-2119
Mfr. Part No.BFP196WH6327XTSA1
BrandInfineon
HK$2.64
Each (In a Pack of 30)
units
NPN 150 mA 12 V SOT-343 Surface Mount 700 mW 70 Single 20 V 2 V 7.5 GHz 4 - -
RS Stock No. 857-8217
Mfr. Part No.BC857SH6827XTSA1
BrandInfineon
HK$0.462
Each (On a Reel of 3000)
units
PNP 100 mA 45 V SOT-363 (SC-88) Surface Mount 250 mW 200 Isolated -50 V -5 V 250 MHz 6 2 -
RS Stock No. 110-7469
Mfr. Part No.BCX5416H6327XTSA1
BrandInfineon
HK$1.657
Each (In a Pack of 100)
units
NPN 1 A 45 V SOT-89 Surface Mount 2 W 25 Single 45 V 5 V - 3 1 -
RS Stock No. 826-9478
Mfr. Part No.BFP196E6327HTSA1
BrandInfineon
HK$2.352
Each (In a Pack of 50)
units
NPN 150 mA 12 V SOT-143 Surface Mount 700 mW 70 Single 20 V 2 V 7.5 GHz 4 1 -