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. 103-2981
Mfr. Part No.D44H11G
HK$6.20
Each (In a Tube of 50)
units
NPN 10 A 80 V TO-220AB Through Hole 2 W 40 Single - 5 V 50 MHz 3 1 -
RS Stock No. 792-5136
Mfr. Part No.2SD1803T-TL-H
HK$6.47
Each (On a Tape of 20)
units
NPN 5 A 50 V TP-FA Surface Mount 20 W 35 Single 60 V 6 V 180 MHz 3 1 -
RS Stock No. 922-7746
Mfr. Part No.ZTX751
HK$2.993
Each (In a Box of 4000)
units
PNP 2 A 60 V E-Line Through Hole 1 W 40 Single 80 V 5 V 140 MHz 3 1 -
RS Stock No. 125-0066
Mfr. Part No.MJ21193G
HK$38.941
Each (In a Tray of 100)
units
PNP 16 A 250 V TO-204AA Through Hole 250 W 8 Single -400 V -5 V - 2 1 -
RS Stock No. 805-1084
Mfr. Part No.2N4403TFR
HK$0.683
Each (In a Pack of 200)
units
PNP 600 mA 40 V TO-92 Through Hole 625 mW 20 Single -40 V -5 V 200 MHz 3 1 -
RS Stock No. 485-9115
Mfr. Part No.D44H11
HK$7.932
Each (In a Pack of 5)
units
NPN 20 A 80 V TO-220 Through Hole 50 W 40 Single 80 V 5 V - 3 1 -
RS Stock No. 751-4307
Mfr. Part No.DSS5240T-7
HK$1.092
Each (On a Tape of 100)
units
PNP 2 A 40 V SOT-23 Surface Mount 600 mW 100 Single -40 V -5 V 100 MHz 3 1 -
RS Stock No. 145-4158
Mfr. Part No.2SD1803T-TL-H
HK$4.40
Each (On a Reel of 700)
units
NPN 5 A 50 V TP-FA Surface Mount 20 W 35 Single 60 V 6 V 180 MHz 3 1 -
RS Stock No. 822-8988
Mfr. Part No.BC846AW-7-F
HK$0.48
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. 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. 806-4627
Mfr. Part No.KSP92TA
HK$0.60
Each (In a Pack of 100)
units
PNP 500 mA 300 V TO-92 Through Hole 625 mW 25 Single -300 V -5 V 100 MHz 3 1 -
RS Stock No. 178-4685
Mfr. Part No.2N4403BU
HK$0.244
Each (In a Bag of 10000)
units
- - - - - - - - - - - - - -
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. 751-5445
Mfr. Part No.ZXTN25100BFHTA
HK$3.781
Each (In a Pack of 25)
units
NPN 3 A 100 V SOT-23 Surface Mount 1.81 W 50 Single 170 V 7 V 160 MHz 3 1 -
RS Stock No. 518-1592
Mfr. Part No.PBSS4240Y,115
BrandNexperia
HK$2.245
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 -
RS Stock No. 510-015
Mfr. Part No.PMBT4401,215
BrandNexperia
HK$1.04
Each (In a Pack of 50)
units
NPN 600 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 145-8939
Mfr. Part No.STN9360
HK$3.43
Each (On a Reel of 1000)
units
PNP 500 mA 600 V SOT-223 Surface Mount 1.6 W 200 Single - -7 V - 3 + Tab 1 -
RS Stock No. 806-4447
Mfr. Part No.KSA992FBU
HK$0.521
Each (In a Pack of 200)
units
PNP 50 mA 120 V TO-92 Through Hole 500 mW 150 Single -120 V -5 V 1 MHz 3 1 -
RS Stock No. 124-5327
Mfr. Part No.MJW21196G
HK$27.398
Each (In a Tube of 30)
units
NPN 16 A 250 V TO-247 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS Stock No. 790-5429
Mfr. Part No.MJW21196G
HK$32.27
Each (In a Pack of 2)
units
NPN 16 A 250 V TO-247 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
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