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. 320-8229
Mfr. Part No.2SC4081T106Q/R
BrandROHM
PHP5.154
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
PHP1.389
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. 826-8428
Mfr. Part No.2SC5103TLQ
BrandROHM
PHP38.007
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. 128-8837
Mfr. Part No.2SCR544P5T100
BrandROHM
PHP13.915
Each (In a Pack of 25)
units
NPN 2.5 A 80 V SOT-89 Surface Mount 500 mW 120 Common Emitter 80 V 6 V 100 MHz 3+Tab 1 -
RS Stock No. 128-8816
Mfr. Part No.2SAR544P5T100
BrandROHM
PHP13.915
Each (In a Pack of 25)
units
PNP 2.5 A 80 V SOT-89 Surface Mount 500 mW 120 Common Emitter -80 V -6 V 100 MHz 3+Tab 1 -
RS Stock No. 177-7989
Mfr. Part No.2SC4082T106/P
BrandROHM
PHP3.895
Each (On a Reel of 3000)
units
NPN 50 mA 20 V UMT Surface Mount 200 mW 82 Single 30 V 3 V 1500 MHz 3 1 -
RS Stock No. 320-8235
Mfr. Part No.2SC4082T106/P
BrandROHM
PHP5.485
Each (In a Pack of 10)
units
NPN 50 mA 20 V UMT Surface Mount 200 mW 82 Single 30 V 3 V 1500 MHz 3 1 -
RS Stock No. 320-8241
Mfr. Part No.2SC4083T106N/P
BrandROHM
PHP5.831
Each (In a Pack of 10)
units
NPN 50 mA 11 V SOT-323 (SC-70) Surface Mount 200 mW 56 Single 20 V 3 V 3200 MHz 3 1 -
RS Stock No. 826-8320
Mfr. Part No.2SA1834TLR
BrandROHM
PHP45.238
Each (In a Pack of 10)
units
PNP 10 A 20 V SC-63 Surface Mount 10 W 82 Single -30 V -6 V 50 MHz 3 1 -
RS Stock No. 177-7990
Mfr. Part No.2SC4083T106N/P
BrandROHM
PHP3.616
Each (On a Reel of 3000)
units
NPN 50 mA 11 V SOT-323 (SC-70) Surface Mount 200 mW 56 Single 20 V 3 V 3200 MHz 3 1 -
RS Stock No. 826-8456
Mfr. Part No.2SD1898T100R
BrandROHM
PHP16.71
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. 826-8425
Mfr. Part No.2SC5876T106R
BrandROHM
PHP13.892
Each (In a Pack of 50)
units
NPN 500 mA 60 V UMT Surface Mount 200 mW 120 Single 60 V 6 V 10 MHz 3 1 -
RS Stock No. 183-4831
Mfr. Part No.BCX17T116
BrandROHM
PHP3.116
Each (In a Pack of 120)
units
PNP 500 mA -50 V SOT-23 Surface Mount 425 mW 100 Single - -5 V 100 MHz 3 1 -
RS Stock No. 168-2010
Mfr. Part No.DTC114TETL
BrandROHM
PHP2.382
Each (In a Pack of 200)
units
NPN 100 mA - SOT-416 Surface Mount 150 mW 100 Single - - 250 MHz 3 1 -
RS Stock No. 183-4619
Mfr. Part No.BC846BT116
BrandROHM
PHP1.558
Each (On a Reel of 3000)
units
NPN 120 mA 65 V SOT-23 Surface Mount 350 mW 200 Single 80 V 6 V 100 MHz 3 1 -
RS Stock No. 184-7675
Mfr. Part No.2SC4102U3T106R
BrandROHM
PHP5.453
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 -
RS Stock No. 183-4620
Mfr. Part No.BC848BT116
BrandROHM
PHP1.558
Each (On a Reel of 3000)
units
NPN 100 mA 30 V SOT-23 Surface Mount 350 mW 200 Single 30 V 5 V 100 MHz 3 1 -
RS Stock No. 171-5382
Mfr. Part No.2SCR586D3TL1
BrandROHM
PHP30.315
Each (On a Reel of 2500)
units
NPN 5 A 80 (Minimum) V TO-252 Surface Mount 10 W 120 Single 80 (Minimum) V 6 (Minimum) V 200 MHz 3 1 -
RS Stock No. 171-5413
Mfr. Part No.EMX52T2R
BrandROHM
PHP2.577
Each (On a Reel of 8000)
units
NPN 100 mA 50 (Minimum) V SOT-563 Surface Mount 150 mW 120 - 50 (Minimum) V 5 (Minimum) V 350 MHz 6 2 -
RS Stock No. 146-7297
Mfr. Part No.2SCR554RTL
BrandROHM
PHP9.93
Each (In a Pack of 50)
units
NPN 1.5 A 80 V SOT-346T (SC-96) Surface Mount 1 W 120 Single 80 V 6 V 300 MHz 3 1 -