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. 145-4730
Mfr. Part No.MMBT2222LT1G
HK$0.185
Each (On a Reel of 3000)
units
NPN 600 mA 30 V SOT-23 Surface Mount 225 mW 30 Single 60 V dc 5 V 100 MHz 3 1 -
RS Stock No. 822-8988
Mfr. Part No.BC846AW-7-F
HK$0.608
Each (In a Pack of 250)
units
NPN 100 mA 65 V SOT-323 (SC-70) Surface Mount 200 mW 110 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 799-4817
Mfr. Part No.2SC5200-O(S1,F,S)
BrandToshiba
HK$20.638
Each (In a Pack of 5)
units
NPN 15 A 230 V TO-3PL Through Hole 150 W 35 Single 230 V 5 V 30 MHz 3 1 -
RS Stock No. 165-8804
Mfr. Part No.BC846AW-7-F
HK$0.244
Each (On a Reel of 3000)
units
NPN 100 mA 65 V SOT-323 (SC-70) Surface Mount 200 mW 110 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 714-0997
Mfr. Part No.MJE340
HK$4.305
Each (In a Pack of 10)
units
NPN 500 mA 300 V SOT-32 Through Hole 2.8 W 30 Single 300 V 3 V - 3 1 -
RS Stock No. 774-3678
Mfr. Part No.TIP30CG
HK$3.914
Each (In a Pack of 10)
units
PNP 1 A 100 V TO-220AB Through Hole 30 W 15 Single 100 V 5 V 1 MHz 3 1 -
RS Stock No. 773-7642
Mfr. Part No.BCP56T3G
HK$1.866
Each (In a Pack of 10)
units
NPN 1 A 80 V SOT-223 Surface Mount 1.5 W 25 Single 100 V 5 V 35 MHz 3 + Tab 1 -
RS Stock No. 739-0445
Mfr. Part No.2N4403TA
HK$1.741
Each (In a Pack of 10)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single 40 V 5 V - 3 1 -
RS Stock No. 122-1439
Mfr. Part No.ZXTN25040DFLTA
HK$1.121
Each (On a Reel of 3000)
units
NPN 1.5 A 40 V SOT-23 Surface Mount 350 mW 25 Single 130 V 7 V 190 MHz 3 1 -
RS Stock No. 922-7740
Mfr. Part No.ZTX753
HK$2.894
Each (In a Bag of 4000)
units
PNP 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 140 MHz 3 1 -
RS Stock No. 518-1671
Mfr. Part No.PBSS4350T,215
BrandNexperia
HK$2.204
Each (In a Pack of 10)
units
NPN 2 A 50 V SOT-23 (TO-236AB) Surface Mount 1.2 W 100 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 823-1293
Mfr. Part No.DXT5551-13
HK$3.031
Each (In a Pack of 50)
units
NPN 600 mA 160 V SOT-89 Surface Mount 1.2 W 200 Single 180 V 6 V 300 MHz 3 1 -
RS Stock No. 625-5076
Mfr. Part No.D44H11G
HK$7.49
Each
units
NPN 10 A 80 V TO-220AB Through Hole 2 W 40 Single - 5 V 50 MHz 3 1 -
RS Stock No. 168-9634
Mfr. Part No.PBSS4240Y,115
BrandNexperia
HK$0.67
Each (On a Reel of 3000)
units
NPN 2 A 40 V UMT Surface Mount 430 mW 150 Single 40 V 5 V 230 MHz 6 1 -
RS Stock No. 178-4767
Mfr. Part No.TIP30CG
HK$3.914
Each (In a Tube of 50)
units
PNP 1 A 100 V TO-220AB Through Hole 30 W 15 Single 100 V 5 V 1 MHz 3 1 -
RS Stock No. 165-8848
Mfr. Part No.2DD2656-7
HK$0.462
Each (On a Reel of 3000)
units
NPN 1 A 30 V SOT-323 (SC-70) Surface Mount 500 mW 270 Single 30 V 6 V 270 MHz 3 1 -
RS Stock No. 669-7509
Mfr. Part No.FZT949TA
HK$8.724
Each (In a Pack of 5)
units
PNP 5.5 A 30 V SOT-223 Surface Mount 3 W 75 Single 50 V 6 V 100 MHz 3 + Tab 1 -
RS Stock No. 168-7288
Mfr. Part No.TIP29A
HK$4.305
Each (In a Tube of 50)
units
NPN 1 A 60 V TO-220 Through Hole 30 W 15 Single 60 V 5 V - 3 1 -
RS Stock No. 822-8644
Mfr. Part No.2DD2656-7
HK$1.004
Each (In a Pack of 100)
units
NPN 1 A 30 V SOT-323 (SC-70) Surface Mount 500 mW 270 Single 30 V 6 V 270 MHz 3 1 -
RS Stock No. 518-1592
Mfr. Part No.PBSS4240Y,115
BrandNexperia
HK$2.184
Each (In a Pack of 10)
units
NPN 2 A 40 V UMT Surface Mount 430 mW 150 Single 40 V 5 V 230 MHz 6 1 -
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