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. 803-1074
Mfr. Part No.BC546ABU
HK$0.791
Each (In a Pack of 200)
units
NPN 100 mA 65 V TO-92 Through Hole 500 mW 110 Single 80 V 6 V 1 MHz 3 1 -
RS Stock No. 128-8837
Mfr. Part No.2SCR544P5T100
BrandROHM
HK$2.294
Each (In a Pack of 25)
units
NPN 2.5 A 80 V SOT-89 Surface Mount 500 mW 120 Common Emitter 80 V 6 V 100 MHz 3+Tab 1 -
RS Stock No. 166-3217
Mfr. Part No.KSA1013OTA
HK$1.047
Each (On a Tape of 2000)
units
PNP 1 A 160 V TO-92 Through Hole 900 mW 60 Single -160 V -6 V 1 MHz 3 1 -
RS Stock No. 184-7008
Mfr. Part No.2SARA41CT116R
BrandROHM
HK$0.821
Each (On a Reel of 3000)
units
PNP 50 mA -120 V SOT-23 Surface Mount 350 mW 180 Single -120 V -5 V 140 MHz 3 1 -
RS Stock No. 178-7038
Mfr. Part No.BCP54,115
BrandNexperia
HK$0.763
Each (On a Reel of 1000)
units
NPN 1 A 45 V SOT-223 (SC-73) Surface Mount 960 mW 40 Single 45 V 5 V 180 MHz 4 1 -
RS Stock No. 128-8820
Mfr. Part No.2SAR572DGTL
BrandROHM
HK$3.516
Each (In a Pack of 25)
units
PNP 5 A 30 V DPAK (TO-252) Surface Mount 10 W 200 Common Emitter -30 V -6 V 100 MHz 3+Tab 1 -
RS Stock No. 146-7272
Mfr. Part No.2SCR522UBTL
BrandROHM
HK$0.244
Each (In a Pack of 250)
units
NPN 200 mA 20 V SOT-323FL Surface Mount 200 mW 120 Single 20 V 5 V 400 MHz 3 1 -
RS Stock No. 792-5189
Mfr. Part No.30C02CH-TL-E
HK$1.957
Each (In a Pack of 50)
units
NPN 700 mA 30 V CPH Surface Mount 700 mW 300 Single 40 V 5 V 540 MHz 3 1 -
RS Stock No. 184-1178
Mfr. Part No.NSS60601MZ4T1G
HK$3.307
Each (In a Pack of 25)
units
NPN 6 A 60 V SOT-223 Surface Mount 800 mW 50 Single 100 V 6 V 1 MHz 3 + Tab 1 AEC-Q101
RS Stock No. 826-8368
Mfr. Part No.2SB1694T106
BrandROHM
HK$1.758
Each (In a Pack of 40)
units
PNP 1 A 30 V SOT-323 (SC-70) Surface Mount 200 mW 270 Single -30 V -6 V 100 MHz 3 1 -
RS Stock No. 153-2839
Mfr. Part No.BFS20W,115
BrandNexperia
HK$0.544
Each (On a Reel of 3000)
units
NPN 25 mA 20 V SC-70, SOT-323 Surface Mount 200 mW 40 Single 30 V 20 V 470 MHz 3 1 AEC-Q101
RS Stock No. 739-0511
Mfr. Part No.MMBT4401
HK$1.334
Each (In a Pack of 10)
units
NPN 600 mA 40 V SOT-23 Surface Mount 350 mW 20 Single 60 V 6 V - 3 1 -
RS Stock No. 145-2805
Mfr. Part No.TIP31CG
HK$1.78
Each (In a Tube of 50)
units
NPN 3 A 100 V TO-220AB Through Hole 40 W 10 Single 100 V 5 V 3 MHz 3 1 -
RS Stock No. 178-7137
Mfr. Part No.BC849C,215
BrandNexperia
HK$0.213
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 184-1524
Mfr. Part No.MMBT2369ALT1G
HK$0.487
Each (In a Pack of 250)
units
NPN 200 (Continuous) mA 15 V SOT-23 Surface Mount 225 mW 20 Single 40 V 4.5 V 100 MHz 3 1 AEC-Q101
RS Stock No. 179-1138
Mfr. Part No.PBSS4320X,135
BrandNexperia
HK$1.182
Each (On a Reel of 4000)
units
NPN 3 A 20 V UPAK Surface Mount 1.6 W 150 Single 20 V 5 V 100 MHz 4 1 -
RS Stock No. 807-5096
Mfr. Part No.BCP53
HK$2.07
Each (On a Tape of 50)
units
PNP 1.2 A 80 V SOT-223 Surface Mount 1.5 W 150 Single -100 V -5 V - 3 + Tab 1 -
RS Stock No. 738-4917
Mfr. Part No.BC847PN-7-F
HK$0.614
Each (On a Tape of 100)
units
NPN + PNP 100 mA 45 V SOT-363 (SC-88) Surface Mount 200 mW 220 Isolated -50 V, 50 V -5 (PNP) V, 6 (NPN) V 200 MHz 6 2 -
RS Stock No. 145-3581
Mfr. Part No.2SA1417S-TD-E
HK$1.441
Each (On a Reel of 1000)
units
PNP 2 A 100 V PCP Surface Mount 1.5 W 100 Single -120 V -6 V 120 MHz 3 1 -
RS Stock No. 163-0035
Mfr. Part No.MJ15001G
HK$28.307
Each (In a Tray of 100)
units
NPN 15 A 140 V TO-204AA Through Hole 200 W 25 Single 140 V 5 V - 2 1 -
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