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 170-4183
製造零件編號BC848A RF
HK$0.282
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NPN 100 mA 30 V SOT-23 Surface Mount 250 mW 110 Single 30 V 5 V - 3 1 -
RS庫存編號 155-068
製造零件編號FMMT497TA
HK$2.85
/個 (每包:25個)
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NPN 500 mA 300 V SOT-23 Surface Mount 500 mW 20 Single 300 V 5 V 75 MHz 3 1 -
RS庫存編號 121-9965
製造零件編號FZT658TA
HK$2.46
個 (在毎卷:1000)
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NPN 500 mA 400 V SOT-223 Surface Mount 2 W 40 Single 400 V 5 V 50 MHz 3 + Tab 1 -
RS庫存編號 166-0498
製造零件編號PMBT3906,215
BrandNexperia
HK$0.163
個 (在毎卷:3000)
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PNP 200 mA 40 V SOT-23 (TO-236AB) Surface Mount 250 mW 30 Single 40 V 6 V - 3 1 -
RS庫存編號 690-0076
製造零件編號BC817-25LT3G
HK$1.14
/個 (每包:25個)
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NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 40 Single 50 V 5 V 100 MHz 3 1 -
RS庫存編號 146-2365
製造零件編號TSC966CW RPG
HK$2.06
個 (在毎卷:2500)
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NPN 300 mA 400 V SOT-223 Surface Mount 1 W 90 Single 600 V 7 V 1 MHz 3 + Tab 1 -
RS庫存編號 184-1036
製造零件編號MUN5335DW1T1G
HK$0.30
個 (在毎卷:3000)
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NPN, PNP 100 (Continuous) mA 50 V SOT-363 Surface Mount 385 mW 80 - 50 V - - 6 2 AEC-Q101
RS庫存編號 800-9695
製造零件編號BF721T1G
HK$1.349
/個 (每包:100個)
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PNP 50 mA 300 V SOT-223 Surface Mount 1.5 W 50 Single -300 V dc -300 V 60 MHz 3 + Tab 1 -
RS庫存編號 165-9998
製造零件編號PBHV9540Z,115
BrandNexperia
HK$1.658
個 (在毎卷:1000)
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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 168-2079
製造零件編號DTC623TKT146
BrandROHM
HK$1.17
/個 (每包:100個)
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NPN 600 mA 20 (Minimum) V SOT-346 Surface Mount 200 mW - Single 20 (Minimum) V 12 (Minimum) V 150 MHz 3 1 -
RS庫存編號 531-9501
製造零件編號2SC3665-Y(F)
BrandToshiba
HK$3.44
/個 (每包:10個)
單位
NPN 800 mA 120 V MSTM Surface Mount 1 W 120 - 120 V 5 V 120 MHz 3 1 -
RS庫存編號 168-3364
製造零件編號DSC200100L
BrandPanasonic
HK$0.445
個 (在毎卷:3000)
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NPN 100 mA 50 V Mini3 G3 B Surface Mount 200 mW 210 Single 60 V 7 V 150 MHz 3 1 -
RS庫存編號 166-1542
製造零件編號PBSS306NZ,135
BrandNexperia
HK$2.996
個 (在毎卷:4000)
單位
NPN 5.1 A 100 V SOT-223 (SC-73) Surface Mount 2 W 30 Single 100 V 5 V 110 MHz 4 1 -
RS庫存編號 790-5325
製造零件編號MJD210RLG
HK$4.52
Each (On a Tape of 10)
單位
PNP 5 A 25 V DPAK (TO-252) Surface Mount 12.5 W 10 Single 40 V dc 8 V 10 MHz 3 1 -
RS庫存編號 807-9874
製造零件編號MJB44H11T4G
HK$8.56
Each (On a Tape of 20)
單位
NPN 10 A 80 V D2PAK (TO-263) Surface Mount 50 W 40 Single 10 V dc 5 V 20 MHz 3 1 -
RS庫存編號 823-1429
製造零件編號FZT796ATA
HK$4.74
/個 (每包:10個)
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PNP 500 mA 200 V SOT-223 Surface Mount 2 W 800 Single -200 V -5 V 100 MHz 3 + Tab 1 -
RS庫存編號 215-6509
製造零件編號FMMT617TA
HK$4.71
/個 (每包:5個)
單位
NPN 3 A 15 V SOT-23 Surface Mount 625 mW - Single 15 V 5 V - 3 1 -
RS庫存編號 110-9096
製造零件編號BDP950H6327XTSA1
BrandInfineon
HK$5.20
/個 (每包:40個)
單位
PNP 3 A 60 V SOT-223 Surface Mount 5 W 15 Single 60 V 5 V - 3 + Tab 1 -
RS庫存編號 822-2144
製造零件編號BC847BVN-7
HK$2.66
/個 (每包:50個)
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NPN + PNP 100 mA 45 V SOT-563 Surface Mount 150 mW 200 Isolated 50 V 6 V 100 (Min.) MHz 6 2 -
RS庫存編號 145-4109
製造零件編號2SD1620-TD-E
HK$1.83
個 (在毎卷:1000)
單位
NPN 3 A 10 V PCP Surface Mount 1.3 W 140 Single 30 V 6 V 1 MHz 3 1 -