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 Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Dimensions Maximum Base Emitter Saturation Voltage
RS Stock No. 184-868
Mfr. Part No.2SC5198-O(Q)
BrandToshiba
HK$10.11
Each
units
NPN 10 A 140 V TO-3PN Through Hole 100 W Single 140 V 5 V 30 MHz 3 1 19 x 15.9 x 4.8mm -
RS Stock No. 125-0072
Mfr. Part No.MJE15030G
HK$10.327
Each (In a Tube of 50)
units
NPN 8 A 150 V TO-220AB Through Hole 50 W Single 150 V 5 V 30 MHz 3 1 9.28 x 10.28 x 4.82mm -
RS Stock No. 544-9680
Mfr. Part No.MJE15030G
HK$13.23
Each
units
NPN 8 A 150 V TO-220AB Through Hole 50 W Single 150 V 5 V 30 MHz 3 1 9.28 x 10.28 x 4.82mm -
RS Stock No. 805-1043
Mfr. Part No.2N3904TAR
HK$0.48
Each (In a Pack of 200)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm 0.95 V
RS Stock No. 739-0442
Mfr. Part No.2N3904TA
HK$1.267
Each (In a Pack of 10)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm 0.95 V
RS Stock No. 805-1056
Mfr. Part No.2N3904TFR
HK$0.48
Each (In a Pack of 200)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm 0.95 V
RS Stock No. 145-4345
Mfr. Part No.BD13916STU
HK$3.164
Each (In a Tube of 60)
units
NPN 1.5 A 80 V TO-126 Through Hole 12.5 W Single 80 V 5 V - 3 1 8 x 3.25 x 11mm -
RS Stock No. 124-1317
Mfr. Part No.2N3904TA
HK$0.268
Each (On a Reel of 2000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 300 MHz 3 1 5.2 x 4.19 x 5.33mm 0.95 V
RS Stock No. 168-6075
Mfr. Part No.BD139
HK$3.876
Each (In a Tube of 50)
units
NPN 3 A 80 V SOT-32 Through Hole 1.25 W Single 80 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -
RS Stock No. 761-3511
Mfr. Part No.BD13916STU
HK$3.44
Each (In a Pack of 10)
units
NPN 1.5 A 80 V TO-126 Through Hole 12.5 W Single 80 V 5 V - 3 1 8 x 3.25 x 11mm -
RS Stock No. 103-2948
Mfr. Part No.MMBT3904LT1G
HK$0.155
Each (On a Reel of 3000)
units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW Single 60 V 6 V 300 MHz 3 1 0.94 x 2.9 x 1.3mm 0.95 V
RS Stock No. 314-1823
Mfr. Part No.BD139
HK$5.28
Each
units
NPN 3 A 80 V SOT-32 Through Hole 1.25 W Single 80 V 5 V - 3 1 10.8 x 7.8 x 2.7mm -
RS Stock No. 843-1575
Mfr. Part No.2N3904BU
HK$1.195
Each (In a Pack of 50)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm 0.95 V
RS Stock No. 793-0753
Mfr. Part No.MMBT3904LT3G
HK$0.224
Each (In a Pack of 200)
units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW Single 60 V dc 6 V 100 MHz 3 1 3.04 x 1.4 x 1.01mm 0.95 V dc
RS Stock No. 170-3540
Mfr. Part No.MMBT3904LT3G
HK$0.138
Each (On a Reel of 10000)
units
NPN 900 mA 40 V SOT-23 Surface Mount 300 mW Single 60 V dc 6 V 100 MHz 3 1 3.04 x 1.4 x 1.01mm 0.95 V dc
RS Stock No. 545-0343
Mfr. Part No.MMBT3904LT1G
HK$0.84
Each (In a Pack of 50)
units
NPN 200 mA 40 V SOT-23 Surface Mount 300 mW Single 60 V 6 V 300 MHz 3 1 0.94 x 2.9 x 1.3mm 0.95 V
RS Stock No. 842-8015
Mfr. Part No.2N3904BU
HK$0.335
Each (In a Bag of 1000)
units
NPN 200 mA 40 V TO-92 Through Hole 625 mW Single 60 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm 0.95 V
RS Stock No. 806-2750
Mfr. Part No.KSC3503DSTU
HK$2.983
Each (In a Tube of 60)
units
NPN 100 mA 300 V TO-126 Through Hole 7 W Single 300 V 5 V 1 MHz 3 1 8 x 3.25 x 11mm 1 V
RS Stock No. 146-2331
Mfr. Part No.BC338-25 A1
HK$0.317
Each (On a Tape of 4000)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW Single 30 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 796-9684
Mfr. Part No.BC338-25 A1
HK$1.235
Each (In a Pack of 250)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW Single 30 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
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