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. 166-1525
Mfr. Part No.BFG35,115
BrandNXP
MYR2.22
Each (On a Reel of 1000)
units
NPN 150 mA 18 V SOT-223 (SC-73) Surface Mount 1 W 25 Single 25 V 2 V 4000 MHz 4 1 -
RS Stock No. 165-8721
Mfr. Part No.BFU725F/N1
BrandNXP
MYR0.558
Each (On a Reel of 3000)
units
NPN 40 mA 2.8 V SOT-343F Surface Mount 136 mW 160 Single 10 V 1 V 12 GHz 4 1 -
RS Stock No. 816-7801
Mfr. Part No.BFU725F/N1
BrandNXP
MYR0.706
Each (In a Pack of 30)
units
NPN 40 mA 2.8 V SOT-343F Surface Mount 136 mW 160 Single 10 V 1 V 12 GHz 4 1 -
RS Stock No. 166-0433
Mfr. Part No.BFQ18A,115
BrandNXP
MYR3.144
Each (On a Reel of 1000)
units
NPN 150 mA 18 V UPAK Surface Mount 1 W 25 Single 25 V 2 V 4000 MHz 4 1 -
RS Stock No. 380-3133
Mfr. Part No.BFG35,115
BrandNXP
MYR4.772
Each (In a Pack of 5)
units
NPN 150 mA 18 V SOT-223 (SC-73) Surface Mount 1 W 25 Single 25 V 2 V 4000 MHz 4 1 -
RS Stock No. 626-2715
Mfr. Part No.BFQ18A,115
BrandNXP
MYR2.624
Each (In a Pack of 5)
units
NPN 150 mA 18 V UPAK Surface Mount 1 W 25 Single 25 V 2 V 4000 MHz 4 1 -
RS Stock No. 179-1181
Mfr. Part No.PRF947,115
BrandNXP
MYR0.719
Each (On a Reel of 12000)
units
NPN 50 mA 10 V UMT Surface Mount 250 mW 50 Single 20 V 1.5 V 8500 MHz 3 1 -
RS Stock No. 792-0872
Mfr. Part No.BLT81,115
BrandNXP
MYR9.395
Each (On a Reel of 2)
units
NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W 25 Single 20 V 2.5 V 900 MHz 3 + Tab 1 -
RS Stock No. 626-2838
Mfr. Part No.BFT25A,215
BrandNXP
MYR1.96
Each (In a Pack of 10)
units
NPN 7 mA 5 V SOT-23 (TO-236AB) Surface Mount 32 mW 50 Single 8 V 2 V 5000 MHz 3 1 -
RS Stock No. 626-3336
Mfr. Part No.PRF947,115
BrandNXP
MYR1.313
Each (In a Pack of 10)
units
NPN 50 mA 10 V UMT Surface Mount 250 mW 50 Single 20 V 1.5 V 8500 MHz 3 1 -
RS Stock No. 165-9834
Mfr. Part No.BLT81,115
BrandNXP
MYR6.67
Each (On a Reel of 1000)
units
NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W 25 Single 20 V 2.5 V 900 MHz 3 + Tab 1 -
RS Stock No. 497-6541
Mfr. Part No.BFG540W/X
BrandNXP
MYR1.41
Each (In a Pack of 5)
units
NPN 120 mA 15 V SOT-343 Surface Mount 500 mW 100 Single 20 V 2.5 V 9000 MHz 4 1 -
RS Stock No. 166-0549
Mfr. Part No.PRF957,115
BrandNXP
MYR0.88
Each (On a Reel of 3000)
units
NPN 100 mA 10 V UMT Surface Mount 270 mW 50 Single 20 V 1.5 V 8500 MHz 3 1 -
RS Stock No. 626-2793
Mfr. Part No.BFS25A,115
BrandNXP
MYR0.612
Each (In a Pack of 10)
units
NPN 7 mA 5 V UMT Surface Mount 32 mW 50 Single 8 V 2 V 5000 MHz 3 1 -
RS Stock No. 626-2759
Mfr. Part No.BFQ67W,115
BrandNXP
MYR1.066
Each (In a Pack of 10)
units
NPN 50 mA 10 V UMT Surface Mount 300 mW 60 Single 20 V 2.5 V 8000 MHz 3 1 -
RS Stock No. 179-1060
Mfr. Part No.BFT25A,215
BrandNXP
MYR0.85
Each (On a Reel of 3000)
units
NPN 7 mA 5 V SOT-23 (TO-236AB) Surface Mount 32 mW 50 Single 8 V 2 V 5000 MHz 3 1 -
RS Stock No. 166-0540
Mfr. Part No.BFG325W/XR,115
BrandNXP
MYR0.693
Each (On a Reel of 3000)
units
NPN 35 mA 6 V CMPAK Surface Mount 210 mW 60 Single 15 V 2 V 14000 MHz 4 1 -
RS Stock No. 626-3342
Mfr. Part No.PRF957,115
BrandNXP
MYR1.003
Each (In a Pack of 10)
units
NPN 100 mA 10 V UMT Surface Mount 270 mW 50 Single 20 V 1.5 V 8500 MHz 3 1 -
RS Stock No. 100-3505
Mfr. Part No.BFR93A,215
BrandNXP
MYR0.92
Each
units
NPN 35 mA 12 V SOT-23 (TO-236AB) Surface Mount 300 mW 40 Single 15 V 2 V 6000 MHz 3 1 -
RS Stock No. 166-0543
Mfr. Part No.BFS25A,115
BrandNXP
MYR0.693
Each (On a Reel of 3000)
units
NPN 7 mA 5 V UMT Surface Mount 32 mW 50 Single 8 V 2 V 5000 MHz 3 1 -