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 669-7411
製造零件編號FZT788BTA
HK$6.264
/個 (每包:5個)
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PNP 3 A 15 V SOT-223 Surface Mount 2 W 150 Single 15 V 5 V 100 MHz 3 + Tab 1 -
RS庫存編號 163-0969
製造零件編號MMBT6428LT1G
HK$0.242
個 (在毎卷:3000)
單位
NPN 200 mA 50 V SOT-23 Surface Mount 225 mW 250 Single 60 V dc 6 V 100 MHz 3 1 -
RS庫存編號 170-2366
製造零件編號BFP842ESDH6327XTSA1
BrandInfineon
HK$3.28
/個 (每包:20個)
單位
NPN 40 mA 2.9 V, 3.25 V SOT-343 Surface Mount 120 mW 150 Single 3.5 V, 4.1 V - 60 GHz 4 1 AEC-Q101
RS庫存編號 751-3635
製造零件編號BCP55TA
HK$1.46
/個 (每包:50個)
單位
NPN 1 A 60 V SOT-223 Surface Mount 2 W 40 Single 60 V 5 V 150 MHz 4 1 -
RS庫存編號 166-0091
製造零件編號BCM62B,215
BrandNexperia
HK$1.297
個 (在毎卷:3000)
單位
PNP 100 mA 45 V SOT-143B Surface Mount 220 mW 100 Single -50 V -5 V 175 MHz 4 1 -
RS庫存編號 663-9005
製造零件編號CPH6519-TL-E
BrandSanyo
HK$4.95
/個 (每包:5個)
單位
NPN 100 mA 50 V CPH Surface Mount 350 mW 800 - 60 V 15 V 200 MHz 6 2 -
RS庫存編號 163-1180
製造零件編號SMMBTA42LT3G
HK$0.531
個 (在毎卷:10000)
單位
NPN 500 mA 300 V SOT-23 Surface Mount 225 mW 25 Single 300 V dc 6 V 100 MHz 3 1 AEC-Q101
RS庫存編號 436-8063
製造零件編號BFS19,215
BrandNexperia
HK$1.784
/個 (每包:25個)
單位
NPN 30 mA 20 V SOT-23 (TO-236AB) Surface Mount 250 mW 65 Single 30 V 5 V 260 MHz 3 1 -
RS庫存編號 166-3456
製造零件編號FSB660A
HK$0.959
個 (在毎卷:3000)
單位
PNP 2 A 60 V SOT-23 Surface Mount 500 mW 40 Single -60 V -5 V 75 MHz 3 1 -
RS庫存編號 752-8088
製造零件編號BCW61DE6327HTSA1
BrandInfineon
HK$0.252
/個 (每包:100個)
單位
PNP 100 mA 32 V SOT-23 Surface Mount 330 mW 100 Single 32 V 5 V 250 MHz 3 1 -
RS庫存編號 774-0689
製造零件編號2SB1202S-TL-E
HK$6.76
/個 (每包:5個)
單位
PNP 5 A 50 V TP-FA Surface Mount 15 W 140 Single -60 V -6 V 1 MHz 4 1 -
RS庫存編號 171-5458
製造零件編號2SA2030T2L
BrandROHM
HK$0.87
/個 (每包:50個)
單位
PNP 500 mA -12 (Minimum) V SOT-723 Surface Mount 150 mW 270 Single -15 (Minimum) V -6 (Minimum) V 260 MHz 3 1 -
RS庫存編號 179-1105
製造零件編號BCW60C
BrandNexperia
HK$0.252
個 (在毎卷:3000)
單位
NPN 100 mA 32 V SOT-23 Surface Mount 250 mW 40 Single 32 V 5 V 100 MHz 3 1 -
RS庫存編號 545-0062
製造零件編號BD180G
HK$5.39
單位
PNP 1 A 80 V TO-225 Through Hole 30 W 15 Single 80 V 5 V 3 MHz 3 1 -
RS庫存編號 166-1329
製造零件編號PZTA92
BrandNexperia
HK$0.98
個 (在毎卷:1000)
單位
PNP 100 mA 300 V SOT-223 (SC-73) Surface Mount 1.2 W 25 Single 300 V 5 V 50 MHz 4 1 -
RS庫存編號 807-0861
製造零件編號FJL4215OTU
HK$20.658
/個 (每包:5個)
單位
PNP 17 A 250 V TO-264 Through Hole 150 W 55 Single -250 V -5 V 30 MHz 3 1 -
RS庫存編號 145-4178
製造零件編號BC846BM3T5G
HK$0.21
個 (在毎卷:8000)
單位
NPN 100 mA 65 V SOT-723 Surface Mount 265 mW 200 Single 80 V dc 6 V 100 MHz 3 1 -
RS庫存編號 178-4696
製造零件編號SMMBTA56LT3G
HK$0.479
個 (在毎卷:10000)
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 166-2723
製造零件編號BC33725BU
HK$0.264
個 (以毎袋:10000)
單位
NPN 800 mA 50 V TO-92 Through Hole 625 mW 60 Single 50 V 5 V 100 MHz 3 1 -
RS庫存編號 171-5392
製造零件編號DTA023YEBTL
BrandROHM
HK$0.167
個 (在毎卷:3000)
單位
PNP 100 mA - SOT-416FL Surface Mount 150 mW 35 Single - - 250 MHz 3 1 -