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 Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Dimensions Maximum Base Emitter Saturation Voltage
RS Stock No. 739-0401
Mfr. Part No.FJA13009TU
PHP78.93
Each (In a Pack of 5)
units
NPN 12 A 400 V TO-3P Through Hole 130 W Single 700 V 9 V - 3 1 15.8 x 5 x 20.1mm 1.6 V
RS Stock No. 792-5063
Mfr. Part No.2SC4027T-TL-E
PHP24.89
Each (In a Pack of 20)
units
NPN 1.5 A 160 V TP-FA Surface Mount 15 W Single 180 V 6 V 120 MHz 3 1 6.5 x 5.5 x 2.3mm 1.2 V
RS Stock No. 171-5648
Mfr. Part No.DTA023YEBTL
BrandROHM
PHP2.63
Each (In a Pack of 250)
units
PNP 100 mA - SOT-416FL Surface Mount 150 mW Single - - 250 MHz 3 1 1.7 x 0.96 x 0.8mm -
RS Stock No. 725-8559
Mfr. Part No.PMBT2222A,215
BrandNexperia
PHP2.092
Each (In a Pack of 100)
units
NPN 600 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 75 V 6 V - 3 1 1 x 3 x 1.4mm 2 V
RS Stock No. 169-3164
Mfr. Part No.BD912
PHP66.09
Each
units
PNP 15 A 100 V TO-220 Through Hole 90 W Single 100 V 5 V 3 MHz 3 1 9.15 x 10.4 x 4.6mm 2.5 V
RS Stock No. 186-4562
Mfr. Part No.2SAR375P5T100Q
BrandROHM
PHP28.30
Each (In a Pack of 20)
units
PNP 3 A -120 V SOT-89 Surface Mount 2 W Single -120 V -6 V 100 MHz 3 1 4.7 x 2.7 x 1.5mm -
RS Stock No. 774-0698
Mfr. Part No.2SB1216S-TL-E
PHP42.31
Each (On a Tape of 5)
units
PNP 4 A 100 V TP-FA Surface Mount 20 W Single -120 V -6 V 1 MHz 4 1 6.5 x 5.5 x 2.3mm -1.2 V
RS Stock No. 518-1700
Mfr. Part No.PBSS4480X,135
BrandNexperia
PHP19.176
Each (In a Pack of 10)
units
NPN 4 A 80 V UPAK Surface Mount 2.5 W Single 80 V 5 V 150 MHz 4 1 1.6 x 4.6 x 2.6mm 1.05 V
RS Stock No. 625-5076
Mfr. Part No.D44H11G
PHP40.42
Each
units
NPN 10 A 80 V TO-220AB Through Hole 2 W Single - 5 V 50 MHz 3 1 9.28 x 10.28 x 4.82mm 1.5 V
RS Stock No. 686-8007
Mfr. Part No.2STN1360
PHP17.623
Each (In a Pack of 20)
units
NPN 3 A 60 V SOT-223 Surface Mount 1.6 W Single 80 V 6 V 130 MHz 3 + Tab 1 1.8 x 6.5 x 3.5mm 1.2 V
RS Stock No. 163-0920
Mfr. Part No.CPH3216-TL-E
PHP4.15
Each (On a Reel of 3000)
units
NPN 1 A 50 V CPH Surface Mount 900 mW Single 80 V 5 V 1 MHz 3 1 2.9 x 1.6 x 0.9mm 1.2 V
RS Stock No. 169-0608
Mfr. Part No.MMDT3946-7-F
PHP3.78
Each (On a Reel of 3000)
units
NPN + PNP 200 mA 40 V SOT-363 (SC-88) Surface Mount 200 mW Isolated -40 V, 60 V -5 (PNP) V, 6 (NPN) V - 6 2 2.2 x 1.35 x 1mm 0.95 NPN V, -0.95 PNP V
RS Stock No. 518-1463
Mfr. Part No.PBSS4120T,215
BrandNexperia
PHP14.91
Each (In a Pack of 25)
units
NPN 1 A 20 V SOT-23 (TO-236AB) Surface Mount 480 mW Single 30 V 5 V 100 MHz 3 1 1 x 3 x 1.4mm 1.1 V
RS Stock No. 165-8543
Mfr. Part No.PBHV8215Z,115
BrandNexperia
PHP9.87
Each (On a Reel of 1000)
units
NPN 2 A 150 V SOT-223 Surface Mount 1.45 W Single 350 V 6 V 100 MHz 3 + Tab 1 6.7 x 3.7 x 1.8mm 1.2 V
RS Stock No. 188-8259
Mfr. Part No.2STF2550
PHP7.12
Each (On a Reel of 2500)
units
PNP 5 A, 10 (Peak) A -50 V SOT-89 Surface Mount 1.4 W Single - -5 V 1 MHz 4 1 4.6 x 2.6 x 1.6mm -1.2 V
RS Stock No. 152-5569
Mfr. Part No.BC56-16PA,115
BrandNexperia
PHP15.75
Each (In a Pack of 50)
units
NPN 1 A 80 V HUSON3, SOT1061 Surface Mount 1.65 W Single 100 V 5 V 180 MHz 3 1 2.1 x 2.1 x 0.65mm -
RS Stock No. 922-7819
Mfr. Part No.FMMT717TA
PHP7.036
Each (On a Reel of 3000)
units
PNP 2.5 A 12 V SOT-23 Surface Mount 625 mW Single 12 V 5 V 110 MHz 3 1 1 x 2.9 x 1.3mm 1 V
RS Stock No. 801-5586
Mfr. Part No.PBHV9050Z,115
BrandNexperia
PHP21.318
Each (On a Tape of 10)
units
PNP 250 mA 500 V SOT-223 Surface Mount 1.4 W Single -500 V -6 V 100 MHz 3 + Tab 1 6.7 x 3.7 x 1.8mm -0.9 V
RS Stock No. 823-1489
Mfr. Part No.MMDT3904VC-7
PHP14.91
Each (In a Pack of 50)
units
NPN 200 mA 40 V SOT-563 Surface Mount 200 mW Isolated 60 V 6 V 300 MHz 6 2 1.7 x 1.25 x 0.6mm 0.95 V
RS Stock No. 823-1381
Mfr. Part No.FMMT6520TA
PHP14.851
Each (In a Pack of 50)
units
PNP 500 mA 350 V SOT-23 Surface Mount 330 mW Single -350 V -5 V 50 MHz 3 1 3 x 1.4 x 1.1mm -900 mV
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