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 madeA 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 transistorTransistors 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. 151-3143
Mfr. Part No.PHPT60603PYX
BrandNexperia
HK$3.60
Each (In a Pack of 25)
units
PNP -3 A -60 V LFPAK56, SOT669 Surface Mount 25 W 35 Single -60 V -8 V 110 MHz 4 + Tab 1 AEC-Q101
RS Stock No. 151-3165
Mfr. Part No.PHPT610035NKX
BrandNexperia
HK$5.243
Each (In a Pack of 25)
units
NPN 3 A 100 V LFPAK56D, SOT1205 Surface Mount 25 W 10 - 100 V 7 V 140 MHz 8 2 AEC-Q101
RS Stock No. 146-6984
Mfr. Part No.2SAR553RTL
BrandROHM
HK$1.362
Each (On a Reel of 3000)
units
PNP 2 A 50 V SOT-346T (SC-96) Surface Mount 1 W 180 Single -50 V -6 V 320 MHz 3 1 -
RS Stock No. 121-9935
Mfr. Part No.FMMT497TA
HK$0.98
Each (On a Reel of 3000)
units
NPN 500 mA 300 V SOT-23 Surface Mount 500 mW 20 Single 300 V 5 V 75 MHz 3 1 -
RS Stock No. 669-7326
Mfr. Part No.FZT458TA
HK$4.594
Each (In a Pack of 10)
units
NPN 300 mA 400 V SOT-223 Surface Mount 2 W 15 Single 400 V 5 V 50 MHz 3 + Tab 1 -
RS Stock No. 145-3873
Mfr. Part No.2SB1123S-TD-E
HK$1.284
Each (On a Reel of 1000)
units
PNP 2 A 50 V PCP Surface Mount 1.3 W 40 Single -60 V -6 V 150 MHz 3 1 -
RS Stock No. 841-205
Mfr. Part No.ZTX690B
HK$7.38
Each (In a Pack of 5)
units
NPN 2 A 45 V E-Line Through Hole 1 W 150 Single 45 V 5 V 150 MHz 3 1 -
RS Stock No. 122-2421
Mfr. Part No.ZX5T851GTA
HK$3.401
Each (On a Reel of 1000)
units
NPN 6 A 60 V SOT-223 Surface Mount 12.8 W 300 Single 150 V 7 V 130 MHz 3 + Tab 1 -
RS Stock No. 146-7297
Mfr. Part No.2SCR554RTL
BrandROHM
HK$3.793
Each (In a Pack of 50)
units
NPN 1.5 A 80 V SOT-346T (SC-96) Surface Mount 1 W 120 Single 80 V 6 V 300 MHz 3 1 -
RS Stock No. 826-8377
Mfr. Part No.2SB1695KT146
BrandROHM
HK$3.028
Each (In a Pack of 30)
units
PNP 1.5 A 30 V SOT-346 (SC-59) Surface Mount 200 mW 270 Single -30 V -6 V 100 MHz 3 1 -
RS Stock No. 171-5411
Mfr. Part No.EMT52T2R
BrandROHM
HK$0.512
Each (On a Reel of 8000)
units
PNP 100 mA -50 (Minimum) V SOT-563 Surface Mount 150 mW 120 - -50 (Minimum) V -5 (Minimum) V 300 MHz 6 2 -
RS Stock No. 146-7090
Mfr. Part No.2SAR502UBTL
BrandROHM
HK$0.604
Each (In a Pack of 250)
units
PNP 500 mA 30 V SOT-323FL Surface Mount 200 mW 200 Single -30 V -6 V 520 MHz 3 1 -
RS Stock No. 725-8537
Mfr. Part No.BC859B,215
BrandNexperia
HK$0.554
Each (In a Pack of 100)
units
PNP 100 mA 30 V SOT-23 (TO-236AB) Surface Mount 250 mW 220 Single 30 V 5 V - 3 1 -
RS Stock No. 145-9546
Mfr. Part No.SMBTA06UPNE6327HTSA1
BrandInfineon
HK$0.924
Each (On a Reel of 3000)
units
NPN + PNP 500 mA 80 V SC-74 Surface Mount 330 mW 100 Isolated 80 V 4 V 100 MHz 6 2 -
RS Stock No. 774-3221
Mfr. Part No.2N3442G
HK$54.01
Each
units
NPN 10 A 140 V TO-204AA Through Hole 117 W 7.5 Single 160 V 7 V 40 kHz 2 1 -
RS Stock No. 162-9438
Mfr. Part No.MJW21193G
HK$30.694
Each (In a Tube of 30)
units
PNP 16 A 250 V TO-247 Through Hole 200 W 8 Single 400 V dc 5 V 1 MHz 3 1 -
RS Stock No. 816-7754
Mfr. Part No.BCV61
BrandNexperia
HK$0.918
Each (In a Pack of 50)
units
NPN 100 mA 30 V SOT-143B Surface Mount 250 mW 100 Single 30 V 6 V 100 MHz 3 1 -
RS Stock No. 122-0885
Mfr. Part No.BCX5416TA
HK$0.895
Each (On a Reel of 1000)
units
NPN 1 A 45 V SOT-89 Surface Mount 1 W 100 Single 45 V 5 V 150 MHz 3 1 -
RS Stock No. 169-7392
Mfr. Part No.FZT491ATA
HK$2.434
Each (On a Reel of 1000)
units
NPN 1 A 40 V SOT-223 Surface Mount 3 W 900 Single 40 V 7 V 150 MHz 3 + Tab 1 -
RS Stock No. 145-3520
Mfr. Part No.BC856BDW1T3G
HK$0.243
Each (On a Reel of 10000)
units
PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 380 mW 220 Isolated -80 V -5 V 100 MHz 6 2 -