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. 669-7515
Mfr. Part No.FZT758TA
PHP36.74
Each (In a Pack of 10)
units
PNP 500 mA 400 V SOT-223 Surface Mount 2 W Single 400 V 5 V 50 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm 0.9 V
RS Stock No. 186-7345
Mfr. Part No.2N6487G
PHP33.722
Each (In a Tube of 50)
units
NPN 15 A 60 V dc TO-220 Through Hole 75 W Single 70 V dc 5 V dc 1 kHz 3 1 10.53 x 4.83 x 15.75mm -
RS Stock No. 122-0884
Mfr. Part No.BCX5316TA
PHP5.25
Each (On a Reel of 1000)
units
PNP 1 A 80 V SOT-89 Surface Mount 1 W Single -100 V -5 V 150 MHz 3 1 4.6 x 2.6 x 1.6mm -
RS Stock No. 195-2573
Mfr. Part No.AFGHL50T65SQDC
PHP456.729
Each (In a Tube of 30)
units
NPN 100 A 650 V TO-247 Through Hole 238 W Single - - 1 MHz 3 1 15.87 x 4.82 x 20.82mm -
RS Stock No. 752-7921
Mfr. Part No.BC847BWH6327XTSA1
BrandInfineon
PHP3.066
Each (In a Pack of 100)
units
NPN 100 mA 45 V SOT-323 (SC-70) Surface Mount 250 mW Single 50 V 6 V 250 MHz 3 1 2 x 1.25 x 0.8mm 900 mV
RS Stock No. 686-7981
Mfr. Part No.STN951
PHP34.537
Each (In a Pack of 10)
units
PNP 5 A 60 V SOT-223 Surface Mount 1.6 W Single 60 V 6 V 130 MHz 3 + Tab 1 1.8 x 6.5 x 3.5mm 1.15 V
RS Stock No. 823-2482
Mfr. Part No.ZXTP717MATA
PHP23.246
Each (In a Pack of 25)
units
PNP 4.5 A 12 V DFN-2020B Surface Mount 2.45 W Single -20 V -7 V 110 MHz 3 1 2.075 x 2.075 x 0.58mm -1.07 V
RS Stock No. 801-0014
Mfr. Part No.CPH6539-TL-H
PHP9.039
Each (In a Pack of 25)
units
NPN 1.5 A 30 V CPH Surface Mount 1.2 W Isolated 40 V 5 V 500 MHz 6 2 2.9 x 1.6 x 0.9mm 1.2 V
RS Stock No. 890-2642
Mfr. Part No.2SC3326-A(TE85L,F)
BrandToshiba
PHP11.642
Each (In a Pack of 25)
units
NPN 300 mA 20 V SOT-346 (SC-59) Surface Mount 150 mW Single 50 V 25 V - 3 1 2.9 x 1.5 x 1.1mm -
RS Stock No. 518-1536
Mfr. Part No.PBSS4160T,215
BrandNexperia
PHP18.11
Each (In a Pack of 25)
units
NPN 900 mA 60 V SOT-23 (TO-236AB) Surface Mount 1.25 W Single 80 V 5 V 220 MHz 3 1 1 x 3 x 1.4mm 1.1 V
RS Stock No. 166-0092
Mfr. Part No.BCM856BS,115
BrandNexperia
PHP5.141
Each (On a Reel of 3000)
units
PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 200 mW Isolated -80 V -5 V 175 MHz 6 2 3 x 1.4 x 1.1mm -
RS Stock No. 807-5093
Mfr. Part No.BCP55
PHP14.595
Each (On a Tape of 50)
units
NPN 1.5 A 60 V SOT-223 Surface Mount 1.5 W Single 60 V 5 V - 3 + Tab 1 6.5 x 3.5 x 1.6mm -
RS Stock No. 146-2131
Mfr. Part No.KSC1008CYTA
PHP2.42
Each (On a Tape of 2000)
units
NPN 700 mA 60 V TO-92 Through Hole 800 mW Single 80 V 8 V 1 MHz 3 1 4.7 x 3.93 x 4.7mm 1.1 V
RS Stock No. 711-4875
Mfr. Part No.MMBT2907A-7-F
PHP2.138
Each (In a Pack of 100)
units
PNP 600 mA 60 V SOT-23 Surface Mount 300 mW Single -60 V -5 V - 3 1 3 x 1.4 x 1.1mm -2.6 V
RS Stock No. 774-3672
Mfr. Part No.TIP31AG
PHP20.007
Each (In a Pack of 10)
units
NPN 3 A 60 V TO-220AB Through Hole 40 W Single 60 V 5 V 1 MHz 3 1 10.28 x 4.82 x 15.75mm -
RS Stock No. 122-3330
Mfr. Part No.APT13003HZTR-G1
PHP3.645
Each (On a Tape of 2000)
units
NPN 1.5 A 800 V TO-92 Through Hole 1.1 W Single 10 V 9 V 4 (Min.) MHz 3 1 4.7 x 3.7 x 4.7mm 1.2 V
RS Stock No. 184-1479
Mfr. Part No.SMMBT4401LT1G
PHP4.78
Each (In a Pack of 100)
units
NPN 600 mA 40 V SOT-23 Surface Mount 225 mW Single 60 V 6 V 100 MHz 3 1 3.04 x 1.4 x 1.01mm 1.2 V dc
RS Stock No. 121-9445
Mfr. Part No.BC857BW-7-F
PHP1.68
Each (On a Reel of 3000)
units
PNP 100 mA 45 V SOT-323 (SC-70) Surface Mount 200 mW Single -50 V -5 V 200 MHz 3 1 2.2 x 1.35 x 1mm -0.95 V
RS Stock No. 125-0073
Mfr. Part No.MJE18004G
PHP30.864
Each (In a Tube of 50)
units
NPN 5 A 450 V TO-220AB Through Hole - Single - 9 V 13 MHz 3 1 9.28 x 10.28 x 4.82mm 1.25 V
RS Stock No. 803-1140
Mfr. Part No.BC559BTA
PHP3.142
Each (In a Pack of 200)
units
PNP 100 mA 30 V TO-92 Through Hole 500 mW Single -30 V -5 V 10 MHz 3 1 5.2 x 4.19 x 5.33mm -800 V
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