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 709-8512
製造零件編號MAT01GHZ
HK$148.59
單位
NPN 25 mA 45 V TO-78 Through Hole 500 mW 250 Isolated - - 450 MHz 6 2 -
RS庫存編號 711-4923
製造零件編號DNBT8105-7
HK$0.997
/個 (每包:50個)
單位
NPN 1 A 60 V SOT-23 Surface Mount 600 mW 30 Single 80 V 5 V - 3 1 -
RS庫存編號 806-4396
製造零件編號KSA1013OTA
HK$2.645
/個 (每包:50個)
單位
PNP 1 A 160 V TO-92 Through Hole 900 mW 60 Single -160 V -6 V 1 MHz 3 1 -
RS庫存編號 857-8227
製造零件編號BC860CWH6327XTSA1
BrandInfineon
HK$0.224
個 (在毎卷:3000)
單位
PNP 100 mA 45 V SOT-323 (SC-70) Surface Mount 330 mW 125 Single -50 V -5 V 250 MHz 3 1 -
RS庫存編號 752-7947
製造零件編號BC857BWH6327XTSA1
BrandInfineon
HK$0.358
/個 (每包:100個)
單位
PNP 100 mA 45 V SOT-323 (SC-70) Surface Mount 250 mW 220 Single 50 V 5 V 250 MHz 3 1 -
RS庫存編號 121-6876
製造零件編號2SA1615-Z-E1-AZ
HK$8.478
/個 (每包:4個)
單位
PNP 10 A 20 V DPAK (TO-252) Surface Mount 15 W 160 Single -30 V -10 V - 3 1 -
RS庫存編號 711-4932
製造零件編號DP350T05-7
HK$1.377
/個 (每包:50個)
單位
PNP 500 mA 350 V SOT-23 Surface Mount 300 mW 15 Single -350 V -5 V - 3 1 -
RS庫存編號 124-6441
製造零件編號2SC5876T106Q
BrandROHM
HK$1.973
/個 (每包:50個)
單位
NPN 500 mA 60 V SOT-323 (SC-70) Surface Mount 200 mW 120 Single 60 V 6 V 300 MHz 3 1 -
RS庫存編號 806-4437
製造零件編號KSA733GTA
HK$0.507
/個 (每包:200個)
單位
PNP 150 mA 50 V TO-92 Through Hole 250 mW 40 Single -60 V -5 V 1 MHz 3 1 -
RS庫存編號 171-5380
製造零件編號2SCR573D3TL1
BrandROHM
HK$2.384
個 (在毎卷:25)
單位
NPN 3 A 50 (Minimum) V TO-252 Surface Mount 10 W 180 Single 50 (Minimum) V 6 (Minimum) V 320 MHz 3 1 -
RS庫存編號 146-0888
製造零件編號BC856S
BrandNexperia
HK$0.195
個 (在毎卷:3000)
單位
PNP 100 mA 65 V SOT-363 (SC-88) Surface Mount 250 mW 110 Isolated -80 V -5 V 100 MHz 6 2 -
RS庫存編號 165-8072
製造零件編號BFP420FH6327XTSA1
BrandInfineon
HK$1.558
個 (在毎卷:3000)
單位
NPN 60 mA 15 V TSFP Surface Mount 210 mW 60 Single 15 V 1.5 V - 4 1 -
RS庫存編號 110-6371
製造零件編號STN0214
HK$5.697
/個 (每包:10個)
單位
NPN 200 mA 1400 V SOT-223 Surface Mount 1.6 W 3 Single - 6 V - 3 + Tab 1 -
RS庫存編號 166-0094
製造零件編號PBHV9050T,215
BrandNexperia
HK$1.413
個 (在毎卷:3000)
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 485-420
製造零件編號PBSS4160U,115
BrandNexperia
HK$0.903
/個 (每包:20個)
單位
NPN 1 A 60 V UMT Surface Mount 415 mW 100 Single 80 V 5 V 220 MHz 3 1 -
RS庫存編號 184-1006
製造零件編號MMBT5179
HK$0.408
個 (在毎卷:3000)
單位
NPN 50 mA 12 V SOT-23 Surface Mount 225 mW 25 Single 20 V 2.5 V 100 MHz 3 1 -
RS庫存編號 781-5250
製造零件編號SMMBTA56LT1G
HK$1.36
/個 (每包:50個)
單位
PNP 500 mA 80 V SOT-23 Surface Mount 225 mW 100 Single -80 V dc -4 V 100 MHz 3 1 AEC-Q101
RS庫存編號 274-936
製造零件編號FZT751TA
HK$3.622
/個 (每包:5個)
單位
PNP 3 A 60 V SOT-223 Surface Mount 2 W 40 Single 80 V 5 V 140 MHz 3 + Tab 1 -
RS庫存編號 781-5115
製造零件編號NSVMMBTH10LT1G
HK$2.133
/個 (每包:20個)
單位
NPN 500 mA 25 V SOT-23 Surface Mount 225 mW 120 Single 30 V dc 25 V 100 MHz 3 1 AEC-Q101
RS庫存編號 184-1157
製造零件編號NJL1302DG
HK$43.635
/個 (每包:2個)
單位
PNP 15 (Continuous) A, 25 (Peak) A 260 V TO-264 Through Hole 200 W 45 Single 260 V 5 V 1 MHz 5 1 -