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. 715-9742
Mfr. Part No.DMG204B00R
BrandPanasonic
MYR1.176
Each (In a Pack of 10)
units
NPN + PNP 500 mA 10 V, 50 V Mini6 G4 B Surface Mount 300 mW 210 Isolated -15 V, 60 V -7 (PNP) V, 7 (NPN) V 150 (NPN) MHz, 250 (PNP) MHz 6 2 -
RS Stock No. 168-3731
Mfr. Part No.DMG204B00R
BrandPanasonic
MYR0.791
Each (On a Reel of 3000)
units
NPN + PNP 500 mA 10 V, 50 V Mini6 G4 B Surface Mount 300 mW 210 Isolated -15 V, 60 V -7 (PNP) V, 7 (NPN) V 150 (NPN) MHz, 250 (PNP) MHz 6 2 -
RS Stock No. 168-3479
Mfr. Part No.DSC7003S0L
BrandPanasonic
MYR1.137
Each (On a Reel of 1000)
units
NPN 1 A 50 V MiniP3 F2 B Surface Mount 1 W 170 Single 60 V 5 V 170 MHz 3 1 -
RS Stock No. 710-5821
Mfr. Part No.DMA201010R
BrandPanasonic
MYR1.281
Each (In a Pack of 20)
units
PNP - 50 V Mini5 G3 B Surface Mount 300 mW 210 Common Emitter - -7 V - 5 2 -
RS Stock No. 749-8209
Mfr. Part No.DSC3G0300L
BrandPanasonic
MYR0.557
Each (In a Pack of 20)
units
NPN 50 mA 20 V SSSMini3 F2 B Surface Mount 100 mW 25 Single 30 V 3 V 1600 MHz 3 1 -
RS Stock No. 168-3379
Mfr. Part No.DSA500100L
BrandPanasonic
MYR0.206
Each (On a Reel of 3000)
units
PNP 100 mA 50 V SMini3 F2 B Surface Mount 150 mW 210 Single -60 V -7 V 150 MHz 3 1 -
RS Stock No. 168-3480
Mfr. Part No.DSC900100L
BrandPanasonic
MYR0.308
Each (On a Reel of 3000)
units
NPN 100 mA 50 V SSMini3 F3 B Surface Mount 125 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 698-0407
Mfr. Part No.DSC200100L
BrandPanasonic
MYR0.217
Each (In a Pack of 100)
units
NPN 100 mA 50 V Mini3 G3 B Surface Mount 200 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 168-3650
Mfr. Part No.DSC710100L
BrandPanasonic
MYR0.87
Each (On a Reel of 1000)
units
NPN 500 mA 80 V MiniP3 F2 B Surface Mount 1 W 130 Single 80 V 5 V 150 MHz 3 1 -
RS Stock No. 713-2851
Mfr. Part No.DSC200200L
BrandPanasonic
MYR0.59
Each (In a Pack of 20)
units
NPN 500 mA 50 V Mini3 G3 B B Surface Mount 200 mW 120 Single 60 V 5 V 160 MHz 3 1 -
RS Stock No. 715-9702
Mfr. Part No.DMC201A00R
BrandPanasonic
MYR1.089
Each (In a Pack of 10)
units
NPN 500 mA 20 V Mini5 G3 B Surface Mount 300 mW 200 Common Emitter 25 V 12 V 150 MHz 5 2 -
RS Stock No. 698-7105
Mfr. Part No.DSC300100L
BrandPanasonic
MYR0.454
Each (In a Pack of 50)
units
NPN 100 mA 50 V SSSMini3 F2 B Surface Mount 100 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 711-5770
Mfr. Part No.DSC7Q01Q0L
BrandPanasonic
MYR1.212
Each (In a Pack of 10)
units
NPN 1 A 80 V MiniP3 F2 B Surface Mount 1 W 4000 Single 100 V 5 V - 3 2 -
RS Stock No. 711-5544
Mfr. Part No.DMG904010R
BrandPanasonic
MYR0.931
Each (In a Pack of 10)
units
NPN + PNP 100 mA 50 V SSMini6 F3 B Surface Mount 125 mW 210 (NPN), 210 (PNP) Isolated - -7 (PNP) V, 7 (NPN) V - 6 2 -
RS Stock No. 707-4317
Mfr. Part No.DSC900100L
BrandPanasonic
MYR0.327
Each (In a Pack of 50)
units
NPN 100 mA 50 V SSMini3 F3 B Surface Mount 125 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 710-5828
Mfr. Part No.DMA204010R
BrandPanasonic
MYR0.821
Each (In a Pack of 20)
units
PNP - 50 V Mini6 G4 B Surface Mount 300 mW 210 Isolated - -7 V - 6 2 -
RS Stock No. 168-3695
Mfr. Part No.DMA501010R
BrandPanasonic
MYR0.445
Each (On a Reel of 3000)
units
PNP - 50 V SMini5 F3 B Surface Mount 150 mW 210 Common Emitter - -7 V - 5 2 -
RS Stock No. 168-3362
Mfr. Part No.DSC2001R0L
BrandPanasonic
MYR0.178
Each (On a Reel of 3000)
units
NPN 100 mA 50 V Mini3 G3 B Surface Mount 200 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS Stock No. 168-3651
Mfr. Part No.DSC7101R0L
BrandPanasonic
MYR0.912
Each (On a Reel of 1000)
units
NPN 500 mA 80 V MiniP3 F2 B Surface Mount 1 W 130 Single 80 V 5 V 150 MHz 3 1 -
RS Stock No. 168-3553
Mfr. Part No.DMA204010R
BrandPanasonic
MYR0.831
Each (On a Reel of 3000)
units
PNP - 50 V Mini6 G4 B Surface Mount 300 mW 210 Isolated - -7 V - 6 2 -