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. 826-8342
Mfr. Part No.2SA2094TLQ
BrandROHM
TWD13.40
Each (In a Pack of 30)
units
PNP 2 A 60 V SOT-346T (SC-96) Surface Mount 500 mW 120 Single -60 V -6 V 100 MHz 3 1 -
RS Stock No. 320-8229
Mfr. Part No.2SC4081T106Q/R
BrandROHM
TWD1.40
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. 177-7988
Mfr. Part No.2SC4081T106Q/R
BrandROHM
TWD1.20
Each (On a Reel of 3000)
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
TWD12.20
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. 826-8336
Mfr. Part No.2SA2071T100Q
BrandROHM
TWD18.10
Each (In a Pack of 20)
units
PNP 3 A 60 V SC-62 Surface Mount 2 W 120 Single -60 V -6 V 10 MHz 3 1 -
RS Stock No. 320-8140
Mfr. Part No.2SC3906KT146E/R/S
BrandROHM
TWD3.60
Each (In a Pack of 25)
units
NPN 50 mA 120 V SOT-346 (SC-59) Surface Mount 200 mW 180 Single 120 V 5 V 140 MHz 3 1 -
RS Stock No. 177-7986
Mfr. Part No.2SC3906KT146E/R/S
BrandROHM
TWD3.30
Each (On a Reel of 3000)
units
NPN 50 mA 120 V SOT-346 (SC-59) Surface Mount 200 mW 180 Single 120 V 5 V 140 MHz 3 1 -
RS Stock No. 124-6440
Mfr. Part No.2SC5866TLQ
BrandROHM
TWD13.90
Each (In a Pack of 25)
units
NPN 2 A 60 V SOT-346T (SC-96) Surface Mount 500 mW 120 Single 60 V 6 V 200 MHz 3 1 -
RS Stock No. 186-4260
Mfr. Part No.BC847BU3T106
BrandROHM
TWD1.60
Each (On a Reel of 3000)
units
NPN 100 mA 45 V SOT-323 Surface Mount 200 mW 200 Single 50 V 6 V 100 MHz 3 1 -
RS Stock No. 168-1972
Mfr. Part No.DTC124EUBTL
BrandROHM
TWD2.10
Each (In a Pack of 200)
units
NPN 100 mA - SOT-323FL Surface Mount 200 mW 56 Single - - 250 MHz 3 1 -
RS Stock No. 183-5455
Mfr. Part No.UMX18NTN
BrandROHM
TWD12.70
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. 826-8428
Mfr. Part No.2SC5103TLQ
BrandROHM
TWD29.30
Each (In a Pack of 10)
units
NPN 5 A 60 V SC-63 Surface Mount 10 W 120 Single 100 V 5 V 30 MHz 3 1 -
RS Stock No. 171-5394
Mfr. Part No.DTA043XEBTL
BrandROHM
TWD1.00
Each (On a Reel of 3000)
units
PNP 100 mA - SOT-416FL Surface Mount 150 mW 35 Single - - 250 MHz 3 1 -
RS Stock No. 124-6887
Mfr. Part No.SST3904T116
BrandROHM
TWD3.40
Each (In a Pack of 100)
units
NPN 200 mA 40 V SST Surface Mount 350 mW - - 60 V 6 V 300 MHz 3 1 -
RS Stock No. 168-2131
Mfr. Part No.DTD114GKT146
BrandROHM
TWD11.90
Each (In a Pack of 50)
units
NPN 500 mA 50 (Minimum) V SOT-346 Surface Mount 200 mW 56 Single 50 (Minimum) V 5 (Minimum) V 200 MHz 3 1 -
RS Stock No. 186-4261
Mfr. Part No.BC857BU3T106
BrandROHM
TWD1.50
Each (On a Reel of 3000)
units
PNP 100 mA -45 V SOT-323 Surface Mount 200 mW 210 Single -50 V -5 V 100 MHz 3 1 -
RS Stock No. 168-1986
Mfr. Part No.DTA114YETL
BrandROHM
TWD3.30
Each (In a Pack of 200)
units
PNP 100 mA - SOT-416 Surface Mount 150 mW 68 Single - - 250 MHz 3 1 -
RS Stock No. 168-2139
Mfr. Part No.DTD123TKT146
BrandROHM
TWD11.90
Each (In a Pack of 50)
units
NPN 500 mA 40 (Minimum) V SOT-346 Surface Mount 200 mW 100 Single 50 (Minimum) V 5 (Minimum) V 200 MHz 3 1 -
RS Stock No. 183-5998
Mfr. Part No.2SCR587D3TL1
BrandROHM
TWD23.70
Each (In a Pack of 10)
units
NPN 3 A 120 V TO-252 Surface Mount 10 W 120 Single 120 V 6 V 100 MHz 3 + Tab 1 -
RS Stock No. 171-5404
Mfr. Part No.EMD59T2R
BrandROHM
TWD2.00
Each (On a Reel of 8000)
units
NPN + PNP 100 (NPN) mA, 100 (PNP) mA - SOT-563 Surface Mount 150 mW 80 - - - 250 MHz 6 2 -