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 madeA 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 transistorTransistors 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. 169-7397
Mfr. Part No.LMN200B02-7
R 1.301
Each (On a Reel of 3000)
units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW 250 N+P Loadswitch -50 V -5 V 200 MHz 6 2 -
RS stock no. 823-1435
Mfr. Part No.LMN200B02-7
R 1.339
Each (In a Pack of 25)
units
NPN + PNP 200 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW 250 N+P Loadswitch -50 V -5 V 200 MHz 6 2 -
RS stock no. 711-5001
Mfr. Part No.MMDT3904-7-F
R 3.719
Each (In a Pack of 20)
units
NPN 200 mA 40 V SOT-363 (SC-88) Surface Mount 200 mW 30 Isolated 60 V 6 V 300 MHz 6 2 -
RS stock no. 751-4411
Mfr. Part No.FZT657TA
R 8.115
Each (In a Pack of 10)
units
NPN 500 mA 300 V SOT-223 Surface Mount 2 W 40 Single 300 V 5 V 30 MHz 3 + Tab 1 -
RS stock no. 711-5128
Mfr. Part No.ZXTN07045EFFTA
R 7.582
Each (In a Pack of 10)
units
NPN 4 A 45 V SOT-23F Surface Mount 2 W 70 Single 45 V 7 V 190 MHz 3 1 -
RS stock no. 922-8058
Mfr. Part No.ZXTP19060CFFTA
R 4.287
Each (On a Reel of 3000)
units
PNP 4 A 60 V SOT-23F Surface Mount 2 W 30 Single -60 V -7 V 180 MHz 3 1 -
RS stock no. 711-5253
Mfr. Part No.ZXTP19060CFFTA
R 8.362
Each (In a Pack of 10)
units
PNP 4 A 60 V SOT-23F Surface Mount 2 W 30 Single -60 V -7 V 180 MHz 3 1 -
RS stock no. 711-4917
Mfr. Part No.BC847BS-7-F
R 2.292
Each (In a Pack of 50)
units
NPN 100 mA 45 V SOT-363 (SC-88) Surface Mount 200 mW 200 Isolated 50 V 5 V - 6 2 -
RS stock no. 169-7470
Mfr. Part No.ZXT849KTC
R 8.624
Each (On a Reel of 2500)
units
NPN 7 A 80 V DPAK (TO-252) Surface Mount 4.2 W 100 Single 80 V 7 V 100 MHz 3 1 -
RS stock no. 711-4904
Mfr. Part No.MMBTA42-7-F
R 2.218
Each (In a Pack of 50)
units
NPN 500 mA 300 V SOT-23 Surface Mount 300 mW 25 Single 300 V 6 V - 3 1 -
RS stock no. 824-5484
Mfr. Part No.ZXT849KTC
R 18.792
Each (In a Pack of 5)
units
NPN 7 A 80 V DPAK (TO-252) Surface Mount 4.2 W 100 Single 80 V 7 V 100 MHz 3 1 -
RS stock no. 751-5436
Mfr. Part No.ZXTN25020DFLTA
R 4.988
Each (On a Tape of 25)
units
NPN 2 A 20 V SOT-23 Surface Mount 350 mW 80 Single 100 V 7 V 215 MHz 3 1 -
RS stock no. 169-0721
Mfr. Part No.ZXTN25020DFLTA
R 2.001
Each (On a Reel of 3000)
units
NPN 2 A 20 V SOT-23 Surface Mount 350 mW 80 Single 100 V 7 V 215 MHz 3 1 -
RS stock no. 711-4960
Mfr. Part No.ZXTP25020DZTA
R 6.841
Each (In a Pack of 10)
units
PNP 5 A 20 V SOT-89 Surface Mount 15.7 W 45 Single -25 V -7 V 290 MHz 3 1 -
RS stock no. 121-9447
Mfr. Part No.BC847BS-7-F
R 0.561
Each (On a Reel of 3000)
units
NPN 100 mA 45 V SOT-363 (SC-88) Surface Mount 200 mW 200 Isolated 50 V 5 V - 6 2 -
RS stock no. 751-3566
Mfr. Part No.BCX54TA
R 4.137
Each (On a Tape of 50)
units
NPN 1 A 45 V SOT-89 Surface Mount 1 W 40 Single 45 V 5 V 150 MHz 3 1 -
RS stock no. 295-517
Mfr. Part No.ZTX653
R 13.098
Each (In a Pack of 5)
units
NPN 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 175 MHz 3 1 -
RS stock no. 178-7055
Mfr. Part No.BCX54TA
R 1.458
Each (On a Reel of 1000)
units
NPN 1 A 45 V SOT-89 Surface Mount 1 W 40 Single 45 V 5 V 150 MHz 3 1 -
RS stock no. 922-7743
Mfr. Part No.ZTX653
R 5.342
Each (In a Bag of 4000)
units
NPN 2 A 100 V E-Line Through Hole 1 W - Single 120 V 5 V 175 MHz 3 1 -
RS stock no. 165-8772
Mfr. Part No.APT13003SZTR-G1
R 1.102
Each (On a Tape of 2000)
units
NPN 1.5 A 700 V TO-92 Through Hole 1.1 W 5 Single - 9 V 4 (Min.) MHz 3 1 -