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. 751-4290
Mfr. Part No.DSS4240T-7
HK$1.174
Each (On a Tape of 100)
units
NPN 2 A 40 V SOT-23 Surface Mount 600 mW 150 Single 40 V 5 V 100 MHz 3 1 -
RS Stock No. 438-4598
Mfr. Part No.BCP53,115
BrandNexperia
HK$0.813
Each (On a Reel of 1000)
units
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W 40 Single 100 V 5 V 145 MHz 4 1 -
RS Stock No. 508-236
Mfr. Part No.BC857C,215
BrandNexperia
HK$0.441
Each (In a Pack of 100)
units
PNP 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 420 Single 50 V 5 V 100 MHz 3 1 -
RS Stock No. 669-7593
Mfr. Part No.FZT957TA
HK$7.258
Each (In a Pack of 5)
units
PNP 1 A 300 V SOT-223 Surface Mount 3 W 90 Single 300 V 6 V 85 MHz 3 + Tab 1 -
RS Stock No. 121-9416
Mfr. Part No.FZT849TA
HK$3.411
Each (On a Reel of 1000)
units
NPN 7 A 30 V SOT-223 Surface Mount 3 W 30 Single 80 V 6 V 100 MHz 3 + Tab 1 -
RS Stock No. 121-9550
Mfr. Part No.DSS4240T-7
HK$0.512
Each (On a Reel of 3000)
units
NPN 2 A 40 V SOT-23 Surface Mount 600 mW 150 Single 40 V 5 V 100 MHz 3 1 -
RS Stock No. 163-1098
Mfr. Part No.NSS40201LT1G
HK$0.813
Each (On a Reel of 3000)
units
NPN 2 A 40 V SOT-23 Surface Mount 460 mW 180 Single 40 V dc 6 V 100 MHz 3 1 -
RS Stock No. 802-1939
Mfr. Part No.MPSW56RLRAG
HK$2.574
Each (In a Pack of 50)
units
PNP 500 mA 80 V TO-92 Through Hole 2.5 W 100 Single -80 V dc -4 V 50 (Min.) MHz 3 1 -
RS Stock No. 544-901
Mfr. Part No.2SC3601E
BrandSanyo
HK$10.20
Each (In a Pack of 5)
units
NPN 150 mA 200 V TO-126 Through Hole 1.2 W 20 - 200 V 4 V 400 MHz 3 1 -
RS Stock No. 170-7962
Mfr. Part No.BC857C,235
BrandNexperia
HK$0.146
Each (On a Reel of 10000)
units
PNP 100 mA -45 V SOT-23 Surface Mount 250 mW 420 Single -50 V -5 V - 3 1 AEC-Q101
RS Stock No. 686-8045
Mfr. Part No.2SD882
HK$5.469
Each (In a Pack of 10)
units
NPN 3 A 30 V SOT-32 Through Hole 12.5 W 30 Single 60 V 5 V 100 MHz 3 1 -
RS Stock No. 166-1817
Mfr. Part No.MMBT2907A
HK$0.288
Each (On a Reel of 3000)
units
PNP 800 mA 60 V SOT-23 Surface Mount 350 mW 50 Single 60 V 5 V - 3 1 -
RS Stock No. 806-2734
Mfr. Part No.KSA1381ESTU
HK$3.135
Each (In a Tube of 60)
units
PNP 100 mA 300 V TO-126 Through Hole 7 W 40 Single -300 V -5 V 150 MHz 3 1 -
RS Stock No. 601-1113
Mfr. Part No.2SA1048-GR(F)
BrandToshiba
HK$1.04
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. 146-2332
Mfr. Part No.BC546C A1
HK$0.293
Each (On a Tape of 4000)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 420 Single 80 V 6 V - 3 1 -
RS Stock No. 102-2276
Mfr. Part No.MJE15033G
HK$10.327
Each (In a Tube of 50)
units
PNP 8 A 250 V TO-220AB Through Hole 50 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS Stock No. 146-2100
Mfr. Part No.BC556BTFR
HK$0.344
Each (On a Reel 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. 168-6253
Mfr. Part No.MJE2955T
HK$5.653
Each (In a Tube of 50)
units
PNP 10 A 60 V TO-220 Through Hole 75 W 5 Single 70 V 5 V 2 MHz 3 1 -
RS Stock No. 796-9672
Mfr. Part No.BC337-40 A1
HK$1.15
Each (In a Pack of 250)
units
NPN 800 mA 45 V TO-92 Through Hole 625 mW 250 Single 50 V 5 V - 3 1 -
RS Stock No. 803-1131
Mfr. Part No.BC556BTFR
HK$0.599
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 -