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 166-2167
製造零件編號KSC5027OTU
HK$4.787
毎管:50 個
單位
NPN 3 A 800 V TO-220 Through Hole 50 W 8 Single 1100 V 7 V 1 MHz 3 1 -
RS庫存編號 178-7544
製造零件編號BC33725TAR
HK$0.439
個 (以毎袋:2000)
單位
- - - - - - - - - - - - - -
RS庫存編號 806-4504
製造零件編號KSC5027OTU
HK$7.027
/個 (每包:10個)
單位
NPN 3 A 800 V TO-220 Through Hole 50 W 8 Single 1100 V 7 V 1 MHz 3 1 -
RS庫存編號 166-2584
製造零件編號SS8050DBU
HK$0.281
個 (以毎袋:10000)
單位
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS庫存編號 802-1939
製造零件編號MPSW56RLRAG
HK$2.574
/個 (每包:50個)
單位
PNP 500 mA 80 V TO-92 Through Hole 2.5 W 100 Single -80 V dc -4 V 50 (Min.) MHz 3 1 -
RS庫存編號 170-4153
製造零件編號BC338-16 A1
HK$0.199
Each (On a Tape of 4000)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 100 Single 30 V 5 V - 3 1 -
RS庫存編號 739-0307
製造零件編號SS8050DBU
HK$1.50
/個 (每包:10個)
單位
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS庫存編號 215-6600
製造零件編號FZT849TA
HK$12.57
單位
NPN 7 A 30 V SOT-223 Surface Mount 3 W 30 Single 80 V 6 V 100 MHz 3 + Tab 1 -
RS庫存編號 796-9690
製造零件編號BC546B A1
HK$0.314
/個 (每包:250個)
單位
NPN 100 mA 65 V TO-92 Through Hole 500 mW 200 Single 80 V 6 V - 3 1 -
RS庫存編號 170-7962
製造零件編號BC857C,235
BrandNexperia
HK$0.113
個 (在毎卷:10000)
單位
PNP 100 mA -45 V SOT-23 Surface Mount 250 mW 420 Single -50 V -5 V - 3 1 AEC-Q101
RS庫存編號 544-901
製造零件編號2SC3601E
BrandSanyo
HK$10.20
/個 (每包:5個)
單位
NPN 150 mA 200 V TO-126 Through Hole 1.2 W 20 - 200 V 4 V 400 MHz 3 1 -
RS庫存編號 166-1565
製造零件編號PZT2907A
BrandNexperia
HK$0.85
個 (在毎卷:1000)
單位
PNP 600 mA 60 V SOT-223 (SC-73) Surface Mount 1.15 W 50 Single 60 V 5 V 200 MHz 4 1 -
RS庫存編號 166-3785
製造零件編號KSC1845FTA
HK$0.276
Each (On a Tape of 2000)
單位
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS庫存編號 121-9416
製造零件編號FZT849TA
HK$4.745
個 (在毎卷:1000)
單位
NPN 7 A 30 V SOT-223 Surface Mount 3 W 30 Single 80 V 6 V 100 MHz 3 + Tab 1 -
RS庫存編號 145-5537
製造零件編號SS8050DTA
HK$0.42
Each (On a Tape of 2000)
單位
NPN 1.5 A 25 V TO-92 Through Hole 1 W 40 Single 40 V 6 V - 3 1 -
RS庫存編號 806-4475
製造零件編號KSC1845FTA
HK$0.811
/個 (每包:200個)
單位
NPN 50 mA 120 V TO-92 Through Hole 500 mW 150 Single 120 V 5 V 110 MHz 3 1 -
RS庫存編號 781-5092
製造零件編號NSS40201LT1G
HK$2.356
/個 (每包:20個)
單位
NPN 2 A 40 V SOT-23 Surface Mount 460 mW 180 Single 40 V dc 6 V 100 MHz 3 1 -
RS庫存編號 438-4598
製造零件編號BCP53,115
BrandNexperia
HK$0.573
個 (在毎卷:1000)
單位
PNP 1 A 80 V SOT-223 (SC-73) Surface Mount 1 W 40 Single 100 V 5 V 145 MHz 4 1 -
RS庫存編號 112-5475
製造零件編號PZT2907A,115
BrandNexperia
HK$3.514
/個 (每包:5個)
單位
PNP 600 mA 60 V SOT-223 (SC-73) Surface Mount 1.15 W 50 Single 60 V 5 V 200 MHz 4 1 -
RS庫存編號 508-236
製造零件編號BC857C,215
BrandNexperia
HK$0.246
/個 (每包:100個)
單位
PNP 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW 420 Single 50 V 5 V 100 MHz 3 1 -