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. 826-9027
Mfr. Part No.BFP405H6740XTSA1
BrandInfineon
PHP19.70
Each (In a Pack of 50)
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NPN 25 mA 15 V SOT-343 Surface Mount 75 mW 60 Single 15 V 1.5 V 25 GHz 4 1 -
RS Stock No. 165-5851
Mfr. Part No.BFP405H6740XTSA1
BrandInfineon
PHP11.723
Each (On a Reel of 3000)
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NPN 25 mA 15 V SOT-343 Surface Mount 75 mW 60 Single 15 V 1.5 V 25 GHz 4 1 -
RS Stock No. 145-8840
Mfr. Part No.BFP640H6327XTSA1
BrandInfineon
PHP11.121
Each (On a Reel of 3000)
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NPN 50 mA 4 V SOT-343 Surface Mount 200 mW 110 Single 13 V 1.2 V 40 GHz 4 1 -
RS Stock No. 827-5202
Mfr. Part No.BFR380L3E6327XTMA1
BrandInfineon
PHP6.653
Each (In a Pack of 100)
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NPN 80 mA 6 V TSLP Surface Mount 380 mW 90 Single 15 V 2 V 14 GHz 3 1 -
RS Stock No. 653-2430
Mfr. Part No.BFP405H6327XTSA1
BrandInfineon
PHP10.238
Each (In a Pack of 5)
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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. 165-5734
Mfr. Part No.BFR380L3E6327XTMA1
BrandInfineon
PHP5.787
Each (On a Reel of 15000)
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NPN 80 mA 6 V TSLP Surface Mount 380 mW 90 Single 15 V 2 V 14 GHz 3 1 -
RS Stock No. 857-8441
Mfr. Part No.BFP193WH6327XTSA1
BrandInfineon
PHP3.41
Each (On a Reel of 3000)
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NPN 80 mA 12 V SOT-343 Surface Mount 580 mW 70 Single 20 V 2 V 8 GHz 4 1 -
RS Stock No. 827-5063
Mfr. Part No.BFP640H6327XTSA1
BrandInfineon
PHP20.42
Each (In a Pack of 25)
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NPN 50 mA 4 V SOT-343 Surface Mount 200 mW 110 Single 13 V 1.2 V 40 GHz 4 1 -
RS Stock No. 165-5870
Mfr. Part No.BCV62CE6327HTSA1
BrandInfineon
PHP3.381
Each (On a Reel of 3000)
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PNP 100 mA 30 V SOT-143 Surface Mount 300 mW 100 Current Mirror 30 V 6 V 250 MHz 4 2 -
RS Stock No. 445-2225
Mfr. Part No.BFR93AE6327HTSA1
BrandInfineon
PHP7.972
Each (In a Pack of 10)
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NPN 90 mA 12 V SOT-23 Surface Mount 300 mW 70 Single 20 V 2 V 6000 MHz 3 1 -
RS Stock No. 145-9624
Mfr. Part No.BC857BWH6327XTSA1
BrandInfineon
PHP0.904
Each (On a Reel of 3000)
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PNP 100 mA 45 V SOT-323 (SC-70) Surface Mount 250 mW 220 Single 50 V 5 V 250 MHz 3 1 -
RS Stock No. 892-2254
Mfr. Part No.BFR340FH6327XTSA1
BrandInfineon
PHP13.726
Each (In a Pack of 50)
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NPN 20 mA 6 V TSFP Surface Mount 75 mW 90 Single 15 V 2 V 14 GHz 3 - -
RS Stock No. 827-0099
Mfr. Part No.BCV62CE6327HTSA1
BrandInfineon
PHP4.25
Each (On a Reel of 250)
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PNP 100 mA 30 V SOT-143 Surface Mount 300 mW 420 Current Mirror 30 V 6 V 250 MHz 4 2 -
RS Stock No. 827-5126
Mfr. Part No.BFP740ESDH6327XTSA1
BrandInfineon
PHP22.52
Each (In a Pack of 25)
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NPN 45 mA 4.9 V SOT-343 Surface Mount 160 mW 160 Single 3 V 0.5 V 45 GHz 4 1 -
RS Stock No. 826-8992
Mfr. Part No.BFP840ESDH6327XTSA1
BrandInfineon
PHP12.044
Each (In a Pack of 50)
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NPN 35 mA 2.25 V SOT-343 Surface Mount 75 mW 150 Single 2.9 V - 80 GHz 4 1 -
RS Stock No. 752-7947
Mfr. Part No.BC857BWH6327XTSA1
BrandInfineon
PHP1.831
Each (In a Pack of 100)
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PNP 100 mA 45 V SOT-323 (SC-70) Surface Mount 250 mW 220 Single 50 V 5 V 250 MHz 3 1 -
RS Stock No. 165-5925
Mfr. Part No.BCX41E6327HTSA1
BrandInfineon
PHP2.842
Each (On a Reel of 3000)
units
NPN 800 mA 125 V SOT-23 Surface Mount 330 mW 63 Single 125 V 5 V 100 MHz 3 1 -
RS Stock No. 911-4717
Mfr. Part No.BFR35APE6327HTSA1
BrandInfineon
PHP6.90
Each (On a Reel of 3000)
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NPN 45 mA 15 V SOT-23 Surface Mount 280 mW 70 Single 20 V 2.5 V 5 GHz 3 1 -
RS Stock No. 753-2721
Mfr. Part No.BC817K40E6327HTSA1
BrandInfineon
PHP1.743
Each (In a Pack of 100)
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NPN 500 mA 45 V SOT-23 Surface Mount 500 mW 630 Single 50 V 5 V 170 MHz 3 1 -
RS Stock No. 911-4748
Mfr. Part No.BC817K40E6327HTSA1
BrandInfineon
PHP1.017
Each (On a Reel of 3000)
units
NPN 500 mA 45 V SOT-23 Surface Mount 500 mW 630 Single 50 V 5 V 170 MHz 3 1 -