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
SGD0.076
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. 826-8406
Mfr. Part No.2SC4081UBTLR
BrandROHM
SGD0.096
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. 475-9790
Mfr. Part No.2SC5658T2LR
BrandROHM
SGD0.191
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. 124-6433
Mfr. Part No.2SA1576AT106Q
BrandROHM
SGD0.143
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. 320-7787
Mfr. Part No.2SA1579T106R/S
BrandROHM
SGD0.188
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. 124-6435
Mfr. Part No.2SAR523UBTL
BrandROHM
SGD0.083
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. 320-7737
Mfr. Part No.2SA1037AKT146Q/R
BrandROHM
SGD0.076
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. 475-9784
Mfr. Part No.2SC5658T2LQ
BrandROHM
SGD0.191
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. 128-8819
Mfr. Part No.2SAR554P5T100
BrandROHM
SGD0.562
Each (In a Pack of 25)
units
PNP 1.5 A 80 V SOT-89 Surface Mount 500 mW 120 Common Emitter -80 V -6 V 100 MHz 3+Tab 1 -
RS Stock No. 320-8229
Mfr. Part No.2SC4081T106Q/R
BrandROHM
SGD0.06
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. 826-8456
Mfr. Part No.2SD1898T100R
BrandROHM
SGD0.529
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. 826-8443
Mfr. Part No.2SD1782KT146R
BrandROHM
SGD0.479
Each (In a Pack of 40)
units
NPN 500 mA 80 V SOT-346 (SC-59) Surface Mount 200 mW 120 Single 80 V 5 V 100 MHz 3 1 -
RS Stock No. 826-8490
Mfr. Part No.2SD2656T106
BrandROHM
SGD0.468
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. 475-9734
Mfr. Part No.2SA1774TLR
BrandROHM
SGD0.136
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. 826-8608
Mfr. Part No.UMX1NTN
BrandROHM
SGD0.486
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
SGD0.168
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 -
RS Stock No. 183-5455
Mfr. Part No.UMX18NTN
BrandROHM
SGD0.549
Each (In a Pack of 40)
units
NPN 500 mA 12 V SOT-363 Surface Mount 150 mW 270 - 15 V 6 V 100 MHz 6 2 -
RS Stock No. 124-6438
Mfr. Part No.2SC4097T106Q
BrandROHM
SGD0.393
Each (In a Pack of 60)
units
NPN 500 mA 32 V SOT-323 (SC-70) Surface Mount 200 mW 120 Single 40 V 5 V 250 MHz 3 1 -
RS Stock No. 124-6443
Mfr. Part No.2SD1782KT146Q
BrandROHM
SGD0.479
Each (In a Pack of 40)
units
NPN 500 mA 80 V SOT-346 Surface Mount 200 mW 120 Single 80 V 5 V 120 MHz 3 1 -
RS Stock No. 184-7675
Mfr. Part No.2SC4102U3T106R
BrandROHM
SGD0.167
Each (In a Pack of 50)
units
NPN 50 mA 120 V SOT-323 Surface Mount 200 mW 180 Single 120 V 5 V 140 MHz 3 1 -