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. 545-0517
Mfr. Part No.TIP50G
HK$5.99
Each
units
NPN 1 A 400 V TO-220AB Through Hole 40 W 10 Single 500 V 5 V 10 MHz 3 1 -
RS Stock No. 102-2276
Mfr. Part No.MJE15033G
HK$10.869
Each (In a Tube of 50)
units
PNP 8 A 250 V TO-220AB Through Hole 50 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 796-9694
Mfr. Part No.BC546C A1
HK$1.284
Each (In a Pack of 250)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 420 Single 80 V 6 V - 3 1 -
RS Stock No. 756-0293
Mfr. Part No.2SC5886A(T6L1,NQ)
BrandToshiba
HK$6.68
Each (In a Pack of 5)
units
NPN 5 A 50 V DPAK (TO-252) Surface Mount 20 W 200 Single 120 V 9 V - 3 1 -
RS Stock No. 166-3072
Mfr. Part No.BC556BTA
HK$0.274
Each (On a Tape of 2000)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS Stock No. 663-8493
Mfr. Part No.2SC2909S-AA
BrandSanyo
HK$2.02
Each (In a Pack of 5)
units
NPN 5 A 160 V NP Through Hole 600 mW 140 - 180 V 5 V 150 MHz 3 1 -
RS Stock No. 112-5469
Mfr. Part No.PZT2222A,115
BrandNexperia
HK$3.85
Each
units
NPN 600 mA 40 V SOT-223 (SC-73) Surface Mount 1.15 W 35 Single 75 V 6 V 300 MHz 4 1 -
RS Stock No. 168-6253
Mfr. Part No.MJE2955T
HK$6.129
Each (In a Tube of 50)
units
PNP 10 A 60 V TO-220 Through Hole 75 W 5 Single 70 V 5 V 2 MHz 3 1 -
RS Stock No. 145-5501
Mfr. Part No.PN2907ATF
HK$0.334
Each (On a Reel of 2000)
units
PNP 800 mA 60 V TO-92 Through Hole 625 mW 100 Single -60 V -5 V 100 MHz 3 1 -
RS Stock No. 484-5194
Mfr. Part No.BCX70H,215
BrandNexperia
HK$1.45
Each (In a Pack of 50)
units
NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 40 Single 45 V 5 V 250 MHz 3 1 -
RS Stock No. 166-3709
Mfr. Part No.BCP54
HK$1.141
Each (On a Reel of 4000)
units
NPN 1.5 A 45 V SOT-223 Surface Mount 1.5 W 150 Single 45 V 5 V - 3 + Tab 1 -
RS Stock No. 486-4577
Mfr. Part No.MJE350
HK$5.552
Each (In a Pack of 5)
units
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W 30 Single 300 V 3 V - 3 1 -
RS Stock No. 806-2734
Mfr. Part No.KSA1381ESTU
HK$3.399
Each (In a Tube of 60)
units
PNP 100 mA 300 V TO-126 Through Hole 7 W 40 Single -300 V -5 V 150 MHz 3 1 -
RS Stock No. 102-1375
Mfr. Part No.MJE15032G
HK$10.95
Each (In a Tube of 50)
units
NPN 8 A 250 V TO-220AB Through Hole 2 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 146-2332
Mfr. Part No.BC546C A1
HK$0.30
Each (On a Tape of 4000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 420 Single 80 V 6 V - 3 1 -
RS Stock No. 761-9831
Mfr. Part No.BC556BTA
HK$0.511
Each (In a Pack of 100)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 150 MHz 3 1 -
RS Stock No. 122-0070
Mfr. Part No.MJ15004G
HK$40.809
Each (In a Tray of 100)
units
PNP 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS Stock No. 102-4116
Mfr. Part No.2SD882
HK$5.31
Each (In a Tube of 50)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 803-1131
Mfr. Part No.BC556BTFR
HK$0.608
Each (In a Pack of 200)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS Stock No. 178-7164
Mfr. Part No.BCX70H,215
BrandNexperia
HK$0.265
Each (On a Reel of 3000)
units
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