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 545-0517
製造零件編號TIP50G
HK$12.02
單位
NPN 1 A 400 V TO-220AB Through Hole 40 W 10 Single 500 V 5 V 10 MHz 3 1 -
RS庫存編號 170-3410
製造零件編號TIP50G
HK$2.904
毎管:50 個
單位
NPN 1 A 400 V TO-220AB Through Hole 40 W 10 Single 500 V 5 V 10 MHz 3 1 -
RS庫存編號 669-7521
製造零件編號FCX491ATA
HK$2.91
/個 (每包:25個)
單位
NPN 1 A 40 V SOT-89 Surface Mount 1 W 35 Single 40 V 5 V 150 MHz 3 1 -
RS庫存編號 146-2332
製造零件編號BC546C A1
HK$0.195
Each (On a Tape of 4000)
單位
NPN 100 mA 65 V TO-92 Through Hole 500 mW 420 Single 80 V 6 V - 3 1 -
RS庫存編號 169-8615
製造零件編號BC550CBU
HK$0.239
個 (以毎袋:1000)
單位
NPN 100 mA 45 V TO-92 Through Hole 500 mW 110 Single 50 V 5 V 1 MHz 3 1 -
RS庫存編號 463-634
製造零件編號MJE15032G
HK$11.102
/個 (每包:5個)
單位
NPN 8 A 250 V TO-220AB Through Hole 2 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS庫存編號 166-3709
製造零件編號BCP54
HK$1.07
個 (在毎卷:4000)
單位
NPN 1.5 A 45 V SOT-223 Surface Mount 1.5 W 150 Single 45 V 5 V - 3 + Tab 1 -
RS庫存編號 801-5580
製造零件編號PBHV9115X,115
BrandNexperia
HK$3.315
/個 (每包:10個)
單位
PNP 1 A 150 V SOT-89 Surface Mount 1.5 W 10 Single -200 V -6 V 100 MHz 3 1 -
RS庫存編號 739-0410
製造零件編號MMBT2907A
HK$1.473
/個 (每包:10個)
單位
PNP 800 mA 60 V SOT-23 Surface Mount 350 mW 50 Single 60 V 5 V - 3 1 -
RS庫存編號 803-1131
製造零件編號BC556BTFR
HK$0.57
/個 (每包:200個)
單位
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS庫存編號 464-158
製造零件編號MJE15033G
HK$10.924
/個 (每包:5個)
單位
PNP 8 A 250 V TO-220AB Through Hole 50 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS庫存編號 168-6253
製造零件編號MJE2955T
HK$4.483
毎管:50 個
單位
PNP 10 A 60 V TO-220 Through Hole 75 W 5 Single 70 V 5 V 2 MHz 3 1 -
RS庫存編號 112-5469
製造零件編號PZT2222A,115
BrandNexperia
HK$10.86
單位
NPN 600 mA 40 V SOT-223 (SC-73) Surface Mount 1.15 W 35 Single 75 V 6 V 300 MHz 4 1 -
RS庫存編號 601-1113
製造零件編號2SA1048-GR(F)
BrandToshiba
HK$1.04
/個 (每包:10個)
單位
PNP 150 mA 50 V E-Line Surface Mount 200 mW 200 - 50 V 5 V 80 MHz 3 1 -
RS庫存編號 102-2276
製造零件編號MJE15033G
HK$9.986
毎管:50 個
單位
PNP 8 A 250 V TO-220AB Through Hole 50 W 10 Single 250 V 5 V 30 MHz 3 1 -
RS庫存編號 807-5099
製造零件編號BCP54
HK$2.005
/個 (每包:50個)
單位
NPN 1.5 A 45 V SOT-223 Surface Mount 1.5 W 150 Single 45 V 5 V - 3 + Tab 1 -
RS庫存編號 122-0070
製造零件編號MJ15004G
HK$30.522
Each (In a Tray of 100)
單位
PNP 20 A 140 V TO-204AA Through Hole 250 W 25 Single 140 V 5 V 2 MHz 2 1 -
RS庫存編號 486-4577
製造零件編號MJE350
HK$4.426
/個 (每包:5個)
單位
PNP 500 mA 300 V SOT-32 Through Hole 20.8 W 30 Single 300 V 3 V - 3 1 -
RS庫存編號 166-3072
製造零件編號BC556BTA
HK$0.206
Each (On a Tape of 2000)
單位
PNP 100 mA 65 V TO-92 Through Hole 500 mW 110 Single -80 V -5 V 10 MHz 3 1 -
RS庫存編號 170-4150
製造零件編號BC337-40 A1
HK$0.199
Each (On a Tape of 4000)
單位
NPN 800 mA 45 V TO-92 Through Hole 625 mW 250 Single 50 V 5 V - 3 1 -