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 177-7985
製造零件編號2SC3837KT146N/P
BrandROHM
HK$0.635
個 (在毎卷:3000)
單位
NPN 50 mA 20 V SOT-346 (SC-59) Surface Mount 200 mW 82 Single 30 V 3 V 1500 MHz 3 1 -
RS庫存編號 165-7538
製造零件編號BC817UPNE6327HTSA1
BrandInfineon
HK$0.49
個 (在毎卷:3000)
單位
NPN + PNP 500 mA 45 V SC-74 Surface Mount 330 mW 100 Isolated 50 V 5 V 170 MHz 6 2 -
RS庫存編號 806-4605
製造零件編號KSP10TA
HK$0.487
/個 (每包:200個)
單位
NPN 4 mA 25 V TO-92 Through Hole 350 mW 60 Single 30 V 3 V 100 MHz 3 1 -
RS庫存編號 145-3076
製造零件編號MMBT2484LT1G
HK$0.218
個 (在毎卷:3000)
單位
NPN 100 mA 60 V SOT-23 Surface Mount 225 mW, 300 mW 250 Single 60 V 6 V 1 MHz 3 1 -
RS庫存編號 781-3957
製造零件編號BC847ALT1G
HK$0.235
/個 (每包:200個)
單位
NPN 100 mA 45 V SOT-23 Surface Mount 300 mW 110 Single 50 V dc 6 V 100 MHz 3 1 -
RS庫存編號 806-4412
製造零件編號KSA1281YTA
HK$2.455
/個 (每包:50個)
單位
PNP 2 A 50 V TO-92 Through Hole 1 W 40 Single -50 V -5 V 1 MHz 3 1 -
RS庫存編號 146-0563
製造零件編號BC857BT-7-F
HK$0.191
個 (在毎卷:3000)
單位
PNP 100 mA 45 V SOT-523 (SC-89) Surface Mount 150 mW 420 Single -50 V -5 V 100 (Min.) MHz 3 1 -
RS庫存編號 184-1002
製造零件編號MMBT3904WT1G
HK$0.199
個 (在毎卷:3000)
單位
NPN 200 (Continuous) mA 40 V SC-70 Surface Mount 150 mW 30 Single 60 V 6 V 100 MHz 3 1 AEC-Q101
RS庫存編號 145-5601
製造零件編號FJV1845EMTF
HK$0.454
個 (在毎卷:3000)
單位
NPN 50 mA 120 V SOT-23 Surface Mount 300 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS庫存編號 739-0408
製造零件編號SS8550DTA
HK$1.74
/個 (每包:10個)
單位
PNP 1.5 A 25 V TO-92 Through Hole 1 W 40 Single -40 V -6 V 200 MHz 3 1 -
RS庫存編號 178-7139
製造零件編號BC847BW,115
BrandNexperia
HK$0.141
個 (在毎卷:3000)
單位
- - - - - - - - - - - - - -
RS庫存編號 751-3528
製造零件編號BC857A-7-F
HK$0.381
Each (On a Tape of 250)
單位
PNP 100 mA 45 V SOT-23 Surface Mount 300 mW 125 Single -50 V -5 V 200 MHz 3 1 -
RS庫存編號 184-7010
製造零件編號2SCRC41CT116R
BrandROHM
HK$0.80
個 (在毎卷:3000)
單位
NPN 50 mA 120 V SOT-23 Surface Mount 350 mW 180 Single 120 V 5 V 140 MHz 3 1 -
RS庫存編號 146-6988
製造零件編號2SCR502EBTL
BrandROHM
HK$0.325
個 (在毎卷:3000)
單位
NPN 500 mA 30 V SOT-416FL Surface Mount 150 mW 200 Single 30 V 6 V 360 MHz 3 1 -
RS庫存編號 808-3902
製造零件編號MJD3055T4G
HK$4.78
Each (On a Tape of 25)
單位
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 168-1930
製造零件編號DTC115EETL
BrandROHM
HK$0.532
/個 (每包:200個)
單位
NPN 100 mA - SOT-416 Surface Mount 150 mW 82 Single - - 250 MHz 3 1 -
RS庫存編號 166-0406
製造零件編號BCP55,115
BrandNexperia
HK$0.581
個 (在毎卷:1000)
單位
NPN 1.5 A 60 V SOT-223 Surface Mount 1.5 W 150 Single 60 V 5 V - 3 + Tab 1 -
RS庫存編號 508-232
製造零件編號BC847BVN,115
BrandNexperia
HK$1.832
/個 (每包:50個)
單位
NPN + PNP 100 mA 45 V SSMini Surface Mount 200 mW 200 Isolated 50 V 5 V 100 MHz 6 2 -
RS庫存編號 145-3093
製造零件編號MJE4343G
HK$20.141
毎管:30 個
單位
NPN 16 A 160 V SOT-93 Through Hole 125 W 8 Single 160 V 7 V 1 MHz 3 1 -
RS庫存編號 751-4531
製造零件編號MMDT5401-7-F
HK$1.372
Each (On a Tape of 50)
單位
PNP 200 mA 150 V SOT-363 (SC-88) Surface Mount 200 mW 40 Isolated -160 V -5 V 300 MHz 6 2 -