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庫存編號 155-197
製造零件編號FZT690BTA
HK$6.691
/個 (每包:10個)
單位
NPN 3 A 45 V SOT-223 Surface Mount - 50 Single 45 V 5 V - 3 + Tab 1 -
RS庫存編號 710-5941
製造零件編號DMC202010R
BrandPanasonic
HK$2.092
/個 (每包:20個)
單位
NPN 100 mA 50 V Mini5 G3 B Surface Mount 300 mW 210 Common Base 60 V 7 V 150 MHz 5 2 -
RS庫存編號 165-9998
製造零件編號PBHV9540Z,115
BrandNexperia
HK$2.27
個 (在毎卷:1000)
單位
PNP 500 mA 500 V SOT-223 Surface Mount 1.45 W 65 Single -500 V -6 V 100 MHz 3 + Tab 1 -
RS庫存編號 124-2283
製造零件編號BCP56-16,115
BrandNexperia
HK$0.822
個 (在毎卷:1000)
單位
NPN 1 A 80 V SOT-223 (SC-73) Surface Mount 960 mW 100 Single 100 V 5 V 180 MHz 4 1 -
RS庫存編號 484-2606
製造零件編號BSP41,115
BrandNexperia
HK$3.374
/個 (每包:10個)
單位
NPN 1 A 60 V SOT-223 (SC-73) Surface Mount 1.3 W 30 Single 70 V 5 V 100 MHz 4 1 -
RS庫存編號 184-4157
製造零件編號2SA2210-1E
HK$11.133
毎管:50 個
單位
PNP 20 A -50 V TO-220F Through Hole 30 W 150 Single -50 V -6 V 1 MHz 3 1 -
RS庫存編號 711-4856
製造零件編號BC856A-7-F
HK$0.316
/個 (每包:100個)
單位
PNP 100 mA 65 V SOT-23 Surface Mount 300 mW 125 Single -80 V -5 V 200 MHz 3 1 -
RS庫存編號 168-3701
製造零件編號DSC2002R0L
BrandPanasonic
HK$0.852
個 (在毎卷:3000)
單位
NPN 500 mA 50 V Mini3 G3 B B Surface Mount 200 mW 120 Single 60 V 5 V 160 MHz 3 1 -
RS庫存編號 823-3040
製造零件編號MMBTA56-7-F
HK$0.322
/個 (每包:200個)
單位
PNP 500 mA 80 V SOT-23 Surface Mount 300 mW 100 Single -80 V -4 V 50 MHz 3 1 -
RS庫存編號 669-7405
製造零件編號FZT1049ATA
HK$6.55
/個 (每包:5個)
單位
NPN 5 A 25 V SOT-223 Surface Mount 2.5 W 40 Single 80 V 5 V 180 MHz 3 + Tab 1 -
RS庫存編號 808-3927
製造零件編號NST3906DXV6T1G
HK$0.792
/個 (每包:100個)
單位
PNP 200 mA 40 V SOT-563 Surface Mount 500 mW 30 Isolated -40 V -5 V 1 kHz 6 2 -
RS庫存編號 790-5371
製造零件編號MJE5731G
HK$7.52
/個 (每包:5個)
單位
PNP 1 A 350 V TO-220 Through Hole 40 W 10 Single 350 V dc 5 V 2 MHz 3 1 -
RS庫存編號 823-3031
製造零件編號MMBTA55-7-F
HK$0.41
/個 (每包:200個)
單位
PNP 500 mA 60 V SOT-23 Surface Mount 300 mW 100 Single -60 V -4 V 50 MHz 3 1 -
RS庫存編號 601-1208
製造零件編號2SA1425-Y(F)
BrandToshiba
HK$2.99
/個 (每包:10個)
單位
PNP 800 mA 120 V MSTM Surface Mount 1 W 120 - 120 V 5 V 120 MHz 3 1 -
RS庫存編號 792-4981
製造零件編號2SA1417S-TD-E
HK$2.235
Each (On a Tape of 25)
單位
PNP 2 A 100 V PCP Surface Mount 1.5 W 100 Single -120 V -6 V 120 MHz 3 1 -
RS庫存編號 178-4699
製造零件編號MMBT2907ALT3G
HK$0.171
個 (在毎卷:10000)
單位
PNP 600 mA 60 V SOT-23 Surface Mount 225 mW, 300 mW, 350 mW 50 Single -60 V -5 V 100 MHz 3 1 -
RS庫存編號 166-2959
製造零件編號2N5551BU
HK$0.242
個 (以毎袋:10000)
單位
NPN 600 mA 160 V TO-92 Through Hole 625 mW 80 Single 180 V 6 V 100 MHz 3 1 -
RS庫存編號 770-3866
製造零件編號2SC4116-GR(TE85L,F
BrandToshiba
HK$1.358
/個 (每包:10個)
單位
NPN 150 mA 50 V SOT-323 (SC-70) Surface Mount 100 mW 70 Single 60 V 5 V - 3 1 -
RS庫存編號 800-9226
製造零件編號2SA1706S-AN
HK$1.122
/個 (每包:25個)
單位
PNP 2 A 50 V NMP Through Hole 1 W 40 Single -60 V -6 V 150 MHz 3 1 -
RS庫存編號 752-8136
製造零件編號BFR181E6327HTSA1
BrandInfineon
HK$1.767
Each (On a Tape of 10)
單位
NPN 20 mA 12 V SOT-23 Surface Mount 175 mW 70 Single 20 V 2 V - 3 1 -