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. 320-7765
Mfr. Part No.2SA1576A
BrandROHM
SGD0.278
Each (In a Pack of 10)
units
PNP 150 mA 50 V UMT Surface Mount 200 mW - Single 60 V 6 V 140 MHz 3 1 -
RS Stock No. 177-7978
Mfr. Part No.2SA1576A
BrandROHM
SGD0.046
Each (On a Reel of 3000)
units
PNP 150 mA 50 V UMT Surface Mount 200 mW - Single 60 V 6 V 140 MHz 3 1 -
RS Stock No. 475-9790
Mfr. Part No.2SC5658T2LR
BrandROHM
SGD0.189
Each (In a Pack of 100)
units
NPN 150 mA 50 V VMT Surface Mount 150 mW 180 Single 60 V 7 V 180 MHz 3 1 -
RS Stock No. 320-7787
Mfr. Part No.2SA1579T106R/S
BrandROHM
SGD0.352
Each (In a Pack of 10)
units
PNP 50 mA 120 V SOT-323 (SC-70) Surface Mount 200 mW 180 Single -120 V -5 V 140 MHz 3 1 -
RS Stock No. 475-9756
Mfr. Part No.2SA2029T2LR
BrandROHM
SGD0.162
Each (In a Pack of 100)
units
PNP 150 mA 50 V VMT Surface Mount 150 mW 180 Single 60 V 6 V 140 MHz 3 1 -
RS Stock No. 124-6433
Mfr. Part No.2SA1576AT106Q
BrandROHM
SGD0.057
Each (In a Pack of 150)
units
PNP 150 mA 50 V SOT-323 (SC-70) Surface Mount 200 mW 120 Single -60 V -6 V 140 MHz 3 1 -
RS Stock No. 826-8406
Mfr. Part No.2SC4081UBTLR
BrandROHM
SGD0.064
Each (In a Pack of 200)
units
NPN 150 mA 50 V UMT Surface Mount 200 mW 120 Single 60 V 7 V 100 MHz 3 1 -
RS Stock No. 177-7980
Mfr. Part No.2SA1579T106R/S
BrandROHM
SGD0.119
Each (On a Reel of 3000)
units
PNP 50 mA 120 V SOT-323 (SC-70) Surface Mount 200 mW 180 Single -120 V -5 V 140 MHz 3 1 -
RS Stock No. 124-6435
Mfr. Part No.2SAR523UBTL
BrandROHM
SGD0.039
Each (In a Pack of 200)
units
PNP 100 mA 50 V SOT-323FL Surface Mount 200 mW 120 Single -50 V -6 V 300 MHz 3 1 -
RS Stock No. 177-7977
Mfr. Part No.2SA1037AKT146Q/R
BrandROHM
SGD0.043
Each (On a Reel of 3000)
units
PNP 150 mA 50 V SOT-346 (SC-59) Surface Mount 200 mW 120 Single -60 V -6 V 140 MHz 3 1 -
RS Stock No. 475-9784
Mfr. Part No.2SC5658T2LQ
BrandROHM
SGD0.16
Each (In a Pack of 100)
units
NPN 150 mA 50 V VMT Surface Mount 150 mW 120 Single 60 V 7 V 180 MHz 3 1 -
RS Stock No. 320-7737
Mfr. Part No.2SA1037AKT146Q/R
BrandROHM
SGD0.099
Each (In a Pack of 10)
units
PNP 150 mA 50 V SOT-346 (SC-59) Surface Mount 200 mW 120 Single -60 V -6 V 140 MHz 3 1 -
RS Stock No. 826-8318
Mfr. Part No.2SA1576UBTLR
BrandROHM
SGD0.058
Each (In a Pack of 200)
units
PNP 150 mA 50 V SC-85 Surface Mount 200 mW 120 Single -60 V -6 V 100 MHz 3 1 -
RS Stock No. 320-8229
Mfr. Part No.2SC4081T106Q/R
BrandROHM
SGD0.095
Each (In a Pack of 25)
units
NPN 150 mA 50 V SOT-323 (SC-70) Surface Mount 200 mW 120 Single 60 V 7 V 180 MHz 3 1 -
RS Stock No. 826-8504
Mfr. Part No.2SD2703TL
BrandROHM
SGD0.253
Each (In a Pack of 40)
units
NPN 1 A 30 V TUMT Surface Mount 800 mW 270 Single 30 V 6 V 100 MHz 3 1 -
RS Stock No. 475-9734
Mfr. Part No.2SA1774TLR
BrandROHM
SGD0.054
Each (In a Pack of 100)
units
PNP 150 mA 50 V EMT Surface Mount 150 mW 180 Single 60 V 6 V 140 MHz 3 1 -
RS Stock No. 826-8490
Mfr. Part No.2SD2656T106
BrandROHM
SGD0.224
Each (In a Pack of 40)
units
NPN 1 A 30 V SOT-323 (SC-70) Surface Mount 200 mW 270 Single 30 V 6 V 100 MHz 3 1 -
RS Stock No. 826-8456
Mfr. Part No.2SD1898T100R
BrandROHM
SGD0.457
Each (In a Pack of 25)
units
NPN 1 A 80 V SC-62 Surface Mount 2 W 120 Single 120 V 5 V 100 MHz 3 1 -
RS Stock No. 826-8608
Mfr. Part No.UMX1NTN
BrandROHM
SGD0.151
Each (In a Pack of 75)
units
NPN 150 mA 50 V SOT-363 (SC-88) Surface Mount 150 mW 120 Isolated 60 V 7 V 100 MHz 6 2 -
RS Stock No. 320-8128
Mfr. Part No.2SC3837KT146N/P
BrandROHM
SGD0.272
Each (In a Pack of 25)
units
NPN 50 mA 20 V SOT-346 (SC-59) Surface Mount 200 mW 82 Single 30 V 3 V 1500 MHz 3 1 -