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. 146-2424
Mfr. Part No.HFA3096BZ
$11.899
Each (In a Tube of 48)
units
NPN + PNP 65 mA 8 V SOIC Surface Mount 150 mW 20 Isolated 12 V 5.5 V 5500 (PNP) MHz, 8000 (NPN) MHz 16 5 -
RS Stock No. 921-5942
Mfr. Part No.HFA3096BZ
$13.80
Each
units
NPN + PNP 65 mA 8 V SOIC Surface Mount 150 mW 20 Isolated 12 V 5.5 V 5500 (PNP) MHz, 8000 (NPN) MHz 16 5 -
RS Stock No. 923-1335
Mfr. Part No.HFA3127BZ
$14.086
Each (In a Tube of 48)
units
NPN 65 mA 8 V SOIC Surface Mount 150 mW 40 Isolated 12 V 5.5 V 8000 MHz 16 5 -
RS Stock No. 921-5428
Mfr. Part No.HFA3127BZ
$16.34
Each
units
NPN 65 mA 8 V SOIC Surface Mount 150 mW 40 Isolated 12 V 5.5 V 8000 MHz 16 5 -
RS Stock No. 496-745
Mfr. Part No.HFA3127BZ
$16.34
Each
units
NPN 65 mA 8 V SOIC Surface Mount 150 mW 40 Isolated 12 V 5.5 V 8000 MHz 16 5 -
RS Stock No. 121-6876
Mfr. Part No.2SA1615-Z-E1-AZ
$2.583
Each (In a Pack of 4)
units
PNP 10 A 20 V DPAK (TO-252) Surface Mount 15 W 160 Single -30 V -10 V - 3 1 -
RS Stock No. 921-5683
Mfr. Part No.HFA3101BZ
$16.74
Each
units
NPN 30 mA 8 V SOIC Surface Mount - 40 Complex 12 V 5.5 V 10000 MHz 8 6 -
RS Stock No. 548-4425
Mfr. Part No.2SA812-A
$4.55
Each
units
PNP 100 mA 50 V MiniMold Surface Mount 200 mW - Single 60 V 5 V 180 MHz 3 1 -
RS Stock No. 548-4431
Mfr. Part No.2SC1623-A
$0.18
Each
units
NPN 100 mA 50 V MiniMold Surface Mount 200 mW - Single 60 V 5 V 250 MHz 3 1 -
RS Stock No. 772-6627
Mfr. Part No.UPA670T-T1-A
$0.325
Each (On a Reel of 40)
units
PNP 100 mA 50 V SOT-363 (SC-88) Surface Mount 200 mW - Isolated - - - 6 2 -
RS Stock No. 772-5074
Mfr. Part No.2SC5336-T1-AZ
$0.761
Each (In a Pack of 10)
units
NPN 100 mA 12 V Power Mini-Mold Surface Mount 1.2 W 50 Single 20 V 3 V - 4 1 -
RS Stock No. 641-5981
Mfr. Part No.2SC4331-AZ(K)
$0.798
Each (In a Pack of 5)
units
NPN 5 A 100 V IPAK (TO-251) Through Hole 2 W 60 Single 150 V 7 V 150 MHz 3 1 -
RS Stock No. 772-4992
Mfr. Part No.2SC3360-T1B-A
$0.332
Each (In a Pack of 40)
units
NPN 100 mA 200 V SOT-346 (SC-59) Surface Mount 200 mW 90 Single 200 V 5 V - 3 1 -
RS Stock No. 772-5141
Mfr. Part No.2SD780-T1B-A
$0.246
Each (In a Pack of 40)
units
NPN 300 mA 60 V SOT-346 (SC-59) Surface Mount 200 mW 110 Single 60 V 5 V - 3 1 -
RS Stock No. 772-5034
Mfr. Part No.2SC4550-AZ
$2.206
Each (In a Pack of 5)
units
NPN 7 A 60 V MP-45F Through Hole 30 W 100 Single 100 V 7 V - 3 1 -
RS Stock No. 772-4974
Mfr. Part No.2SC1622A-T1B-A
$0.297
Each (In a Pack of 40)
units
NPN 50 mA 120 V SOT-346 (SC-59) Surface Mount 200 mW 135 Single 120 V 5 V - 3 1 -
RS Stock No. 121-6878
Mfr. Part No.2SD1584-Z-E1-AZ
$3.00
Each (In a Pack of 4)
units
NPN 3 A 60 V DPAK (TO-252) Surface Mount 2 W 500 Single 60 V 7 V - 3 1 -
RS Stock No. 121-6877
Mfr. Part No.2SB1261(0)-Z-E1-AZ
$1.86
Each (In a Pack of 10)
units
PNP 3 A 60 V DPAK (TO-252) Surface Mount 10 W 50 Single -60 V -7 V - 3 1 -
RS Stock No. 772-4983
Mfr. Part No.2SC2223-T1B-A
$0.306
Each (In a Pack of 40)
units
NPN 20 mA 20 V SOT-346 (SC-59) Surface Mount 150 mW 40 Single 30 V 4 V - 3 1 -
RS Stock No. 772-4977
Mfr. Part No.2SB806-T1-AZ
$0.483
Each (In a Pack of 20)
units
PNP 700 mA 120 V SC-62 Surface Mount 2 W 90 Single -120 V -5 V - 3 1 -