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 796-9763
製造零件編號BC817-25W RF
HK$0.318
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NPN 500 mA 45 V SOT-323 (SC-70) Surface Mount 200 mW 160 Single 50 V 5 V - 3 1 -
RS庫存編號 145-5283
製造零件編號MJD3055T4G
HK$2.415
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NPN 10 A 60 V DPAK (TO-252) Surface Mount 20 W 5 Single 70 V 5 V 500 kHz 3 1 -
RS庫存編號 752-7931
製造零件編號BC850BWH6327XTSA1
BrandInfineon
HK$0.389
/個 (每包:100個)
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NPN 100 mA 45 V SOT-323 (SC-70) Surface Mount 250 mW 200 Single 50 V 6 V 250 MHz 3 1 -
RS庫存編號 151-2660
製造零件編號BCP53-10TX
BrandNexperia
HK$0.46
個 (在毎卷:1000)
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PNP -1 A -80 V SC-73, SOT223 Surface Mount 1.35 W 40 Single -100 V -5 V 145 MHz 3 1 AEC-Q101
RS庫存編號 826-9866
製造零件編號BC849CE6327HTSA1
BrandInfineon
HK$0.265
個 (在毎卷:1500)
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NPN 100 mA 30 V SOT-23 Surface Mount 330 mW 420 Single 30 V 6 V 250 MHz 3 1 -
RS庫存編號 166-0050
製造零件編號2PD601BRL,215
BrandNexperia
HK$0.316
個 (在毎卷:3000)
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NPN 200 mA 50 V SOT-23 Surface Mount 250 mW 210 Single 600 V 6 V - 3 1 -
RS庫存編號 807-6027
製造零件編號FSB560
HK$1.447
/個 (每包:50個)
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NPN 2 A 60 V SOT-23 Surface Mount 500 mW 100 Single 80 V 5 V 75 MHz 3 1 -
RS庫存編號 751-3601
製造零件編號BCP5210TA
HK$1.141
/個 (每包:50個)
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PNP 1 A 60 V SOT-223 Surface Mount 2 W 63 Single -60 V -5 V 150 MHz 3 + Tab 1 -
RS庫存編號 781-6764
製造零件編號PBHV9050T,215
BrandNexperia
HK$2.283
Each (On a Tape of 25)
單位
PNP 150 mA 500 V SOT-23 Surface Mount 300 mW 100 Single -500 V -6 V - 3 1 -
RS庫存編號 781-5203
製造零件編號SBC857CLT1G
HK$0.433
/個 (每包:50個)
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PNP 100 mA 45 V SOT-23 Surface Mount 225 mW 125 Single -50 V -5 V 100 MHz 3 1 AEC-Q101
RS庫存編號 816-7726
製造零件編號BC848W
BrandNexperia
HK$0.142
/個 (每包:300個)
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NPN 100 mA 30 V SOT-323 (SC-70) Surface Mount 200 mW 110 Single 30 V 5 V 100 MHz 3 1 -
RS庫存編號 186-8076
製造零件編號MJD2955G
HK$4.804
/個 (每包:25個)
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PNP 10 A 60 V dc DPAK Surface Mount 20 W 5 Single 70 V dc 5 V dc 500 kHz 3 1 AEC-Q101
RS庫存編號 153-2856
製造零件編號BC846BMB,315
BrandNexperia
HK$0.248
個 (在毎卷:10000)
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NPN 100 mA 65 V DFN1006B, SOT-883B Surface Mount 250 mW 200 Single 80 V 65 V - 3 1 AEC-Q101
RS庫存編號 155-298
製造零件編號FMMT618TA
HK$3.619
/個 (每包:25個)
單位
NPN 2.5 A 20 V SOT-23 Surface Mount 625 mW 100 Single 20 V 5 V 140 MHz 3 1 -
RS庫存編號 669-7495
製造零件編號FMMT723TA
HK$3.93
/個 (每包:10個)
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PNP 1 A 100 V SOT-23 Surface Mount 625 mW 250 Single 100 V 5 V 200 MHz 3 1 -
RS庫存編號 146-0544
製造零件編號BC847W
BrandNexperia
HK$0.097
個 (在毎卷:3000)
單位
NPN 100 mA 45 V SOT-323 (SC-70) Surface Mount 200 mW 90 Single 50 V 6 V 100 MHz 3 1 -
RS庫存編號 807-1019
製造零件編號FMB3946
HK$2.227
/個 (每包:50個)
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NPN + PNP 200 mA 40 V SOT-23 Surface Mount 700 mW 100 Isolated 40 V 5 V 200 MHz 6 2 -
RS庫存編號 163-0855
製造零件編號50C02SS-TL-E
HK$0.436
個 (在毎卷:8000)
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NPN 400 mA 50 V SSFP Surface Mount 200 mW 300 Single 60 V 5 V 1 MHz 3 1 -
RS庫存編號 751-3613
製造零件編號BCP53TA
HK$1.392
Each (On a Tape of 50)
單位
PNP 1 A 80 V SOT-223 Surface Mount 2 W 40 Single -100 V -5 V 150 MHz 3 + Tab 1 -
RS庫存編號 170-8027
製造零件編號BC847CW,135
BrandNexperia
HK$0.15
個 (在毎卷:10000)
單位
NPN 100 mA 45 V SOT-323 Surface Mount 200 mW 110 Single 50 V 6 V - 3 1 AEC-Q101