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. 922-7800
Mfr. Part No.FZT851TA
TWD14.70
Each (On a Reel of 1000)
units
NPN 6 A 60 V SOT-223 Surface Mount 3 W - Single 150 V 6 V - 3 + Tab 1 -
RS Stock No. 169-4139
Mfr. Part No.FZT851TA
TWD32.00
Each
units
NPN 6 A 60 V SOT-223 Surface Mount 3 W - Single 150 V 6 V - 3 + Tab 1 -
RS Stock No. 738-4891
Mfr. Part No.BC817-40-7-F
TWD2.10
Each (In a Pack of 100)
units
NPN 500 mA 45 V SOT-23 Surface Mount 310 mW 170 Single - 5 V - 3 1 -
RS Stock No. 122-0261
Mfr. Part No.MMBT4401-7-F
TWD0.80
Each (On a Reel of 3000)
units
NPN 600 mA 40 V SOT-23 Surface Mount 300 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 751-4509
Mfr. Part No.MMBT4401-7-F
TWD1.50
Each (On a Tape of 250)
units
NPN 600 mA 40 V SOT-23 Surface Mount 300 mW 20 Single 60 V 6 V 250 MHz 3 1 -
RS Stock No. 922-7803
Mfr. Part No.FZT951TA
TWD15.70
Each (On a Reel of 1000)
units
PNP 5 A 60 V SOT-223 Surface Mount 3 W 10 Single 100 V 6 V 120 MHz 3 + Tab 1 -
RS Stock No. 169-4145
Mfr. Part No.FZT951TA
TWD34.00
Each
units
PNP 5 A 60 V SOT-223 Surface Mount 3 W 10 Single 100 V 6 V 120 MHz 3 + Tab 1 -
RS Stock No. 155-024
Mfr. Part No.ZXTP2029FTA
TWD22.70
Each (In a Pack of 10)
units
PNP 3 A 100 V SOT-23 Surface Mount 1.56 W 40 Single 130 V 7 V 150 MHz 3 1 -
RS Stock No. 711-4957
Mfr. Part No.ZXTP5401GTA
TWD12.60
Each (In a Pack of 10)
units
PNP 600 mA 150 V SOT-223 Surface Mount 2 W 50 Single -160 V -5 V 100 MHz 3 + Tab 1 -
RS Stock No. 711-4878
Mfr. Part No.MMBT3906-7-F
TWD1.40
Each (In a Pack of 100)
units
PNP 200 mA 40 V SOT-23 Surface Mount 300 mW 30 Single -40 V -5 V - 3 1 -
RS Stock No. 922-7633
Mfr. Part No.ZXTP2029FTA
TWD11.70
Each (On a Reel of 3000)
units
PNP 3 A 100 V SOT-23 Surface Mount 1.56 W 40 Single 130 V 7 V 150 MHz 3 1 -
RS Stock No. 169-0600
Mfr. Part No.ZXTP5401GTA
TWD6.00
Each (On a Reel of 1000)
units
PNP 600 mA 150 V SOT-223 Surface Mount 2 W 50 Single -160 V -5 V 100 MHz 3 + Tab 1 -
RS Stock No. 885-5369
Mfr. Part No.2DC4672-13
TWD12.40
Each (In a Pack of 40)
units
NPN 3 A 50 V SOT-89 Surface Mount 2 W 45 Single 60 V 7 V 1 MHz 3 1 -
RS Stock No. 738-4885
Mfr. Part No.BC807-25-7-F
TWD3.50
Each (In a Pack of 100)
units
PNP 500 mA 45 V SOT-23 Surface Mount 310 mW 100 Single - -5 V - 3 1 -
RS Stock No. 711-4866
Mfr. Part No.MMBT2222A-7-F
TWD1.50
Each (In a Pack of 100)
units
NPN 600 mA 40 V SOT-23 Surface Mount 300 mW 35 Single 75 V 6 V - 3 1 -
RS Stock No. 165-8654
Mfr. Part No.2DC4672-13
TWD4.30
Each (On a Reel of 2500)
units
NPN 3 A 50 V SOT-89 Surface Mount 2 W 45 Single 60 V 7 V 1 MHz 3 1 -
RS Stock No. 155-276
Mfr. Part No.FMMT619TA
TWD16.00
Each (In a Pack of 25)
units
NPN 2 A 50 V SOT-23 Surface Mount 625 mW 100 Single 50 V 5 V 165 MHz 3 1 -
RS Stock No. 295-501
Mfr. Part No.ZTX651
TWD29.60
Each (In a Pack of 5)
units
NPN 2 A 60 V E-Line Through Hole 1 W - Single 80 V 5 V 175 MHz 3 1 -
RS Stock No. 122-3330
Mfr. Part No.APT13003HZTR-G1
TWD2.80
Each (On a Tape of 2000)
units
NPN 1.5 A 800 V TO-92 Through Hole 1.1 W 5 Single 10 V 9 V 4 (Min.) MHz 3 1 -
RS Stock No. 274-936
Mfr. Part No.FZT751TA
TWD28.60
Each (In a Pack of 5)
units
PNP 3 A 60 V SOT-223 Surface Mount 2 W 40 Single 80 V 5 V 140 MHz 3 + Tab 1 -