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. 145-8845
Mfr. Part No.BFP640ESDH6327XTSA1
BrandInfineon
TWD8.30
Each (On a Reel of 3000)
units
NPN 50 mA 4.1 V SOT-343 Surface Mount 200 mW 110 Single 4.8 V 0.5 V 45 GHz 4 1 -
RS Stock No. 738-4885
Mfr. Part No.BC807-25-7-F
TWD2.30
Each (In a Pack of 100)
units
PNP 500 mA 45 V SOT-23 Surface Mount 310 mW 100 Single - -5 V - 3 1 -
RS Stock No. 803-1131
Mfr. Part No.BC556BTFR
TWD1.90
Each (In a Pack of 200)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS Stock No. 862-4893
Mfr. Part No.2N5686G
TWD373.00
Each
units
NPN 50 A 80 V TO-204 Through Hole 300 mW 5 Single 80 V 5 V - 2 1 -
RS Stock No. 179-1081
Mfr. Part No.MMBT3906,215
BrandNexperia
TWD0.60
Each (On a Reel of 3000)
units
PNP 200 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW 30 Single 40 V 6 V - 3 1 -
RS Stock No. 145-4154
Mfr. Part No.2SD1624T-TD-E
TWD6.50
Each (On a Reel of 1000)
units
NPN 3 A 50 V PCP Surface Mount 1.5 W 35 Single 60 V 6 V 150 MHz 3 1 -
RS Stock No. 601-1113
Mfr. Part No.2SA1048-GR(F)
BrandToshiba
TWD5.60
Each (In a Pack of 10)
units
PNP 150 mA 50 V E-Line Surface Mount 200 mW 200 - 50 V 5 V 80 MHz 3 1 -
RS Stock No. 121-9989
Mfr. Part No.FCX1053ATA
TWD10.30
Each (On a Reel of 1000)
units
NPN 3 A 75 V SOT-89 Surface Mount 1.6 W 40 Single 150 V 5 V 140 MHz 3 1 -
RS Stock No. 826-8336
Mfr. Part No.2SA2071T100Q
BrandROHM
TWD12.20
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. 163-2014
Mfr. Part No.2SD1624S-TD-E
TWD7.90
Each (On a Reel of 1000)
units
NPN 3 A 50 V PCP Surface Mount 1.5 W 100 Single 60 V 6 V 150 MHz 3 1 -
RS Stock No. 922-7813
Mfr. Part No.FMMT720TA
TWD3.80
Each (On a Reel of 3000)
units
PNP 1.5 A 40 V SOT-23 Surface Mount 625 mW 12 Single 40 V 5 V 190 MHz 3 1 -
RS Stock No. 166-3785
Mfr. Part No.KSC1845FTA
TWD1.10
Each (On a Tape of 2000)
units
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS Stock No. 163-1233
Mfr. Part No.TIP41CG
TWD11.40
Each (In a Tube of 50)
units
NPN 6 A 100 V TO-220AB Through Hole 65 W 15 Single 100 V 5 V 1 MHz 3 1 -
RS Stock No. 544-9371
Mfr. Part No.MJE3055TG
TWD31.00
Each
units
NPN 10 A 60 V TO-220AB Through Hole 75 W 5 Single 70 V 5 V 2 MHz 3 1 -
RS Stock No. 166-2036
Mfr. Part No.PZTA06
TWD4.10
Each (On a Reel of 4000)
units
NPN 500 mA 80 V SOT-223 Surface Mount 1 W 100 Single 80 V 4 V 100 MHz 3 + Tab 1 -
RS Stock No. 166-3072
Mfr. Part No.BC556BTA
TWD0.80
Each (On a Tape of 2000)
units
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS Stock No. 806-4642
Mfr. Part No.KST3904MTF
TWD1.10
Each (In a Pack of 200)
units
NPN 200 mA 40 V SOT-23 Surface Mount 350 mW 30 Single 60 V 6 V 100 MHz 3 1 -
RS Stock No. 169-8620
Mfr. Part No.BC557BTF
TWD1.00
Each (On a Reel of 2000)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 10 MHz 3 1 -
RS Stock No. 124-1348
Mfr. Part No.BC557BTA
TWD1.10
Each (On a Reel of 2000)
units
PNP 100 mA 45 V TO-92 Through Hole 500 mW 110 Single -50 V -5 V 150 MHz 3 1 -
RS Stock No. 739-0546
Mfr. Part No.MMBT5401
TWD5.40
Each (In a Pack of 10)
units
PNP 600 mA 150 V SOT-23 Surface Mount 350 mW 50 Single -160 V -5 V 300 MHz 3 1 -