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 738-7571
製造零件編號2N2222ACSM
BrandSemelab
HK$205.69
單位
NPN 800 mA 40 V LCC 1 Surface Mount 500 mW 50 Single 75 V 6 V 250 MHz 3 1 -
RS庫存編號 805-1059
製造零件編號2N3906TA
HK$0.73
/個 (每包:200個)
單位
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS庫存編號 169-8696
製造零件編號2N3906TAR
HK$0.228
個 (在毎卷:2000)
單位
PNP 200 mA 40 V TO-92 Through Hole 625 mW 60 Single -40 V -5 V 250 MHz 3 1 -
RS庫存編號 751-4290
製造零件編號DSS4240T-7
HK$0.927
Each (On a Tape of 100)
單位
NPN 2 A 40 V SOT-23 Surface Mount 600 mW 150 Single 40 V 5 V 100 MHz 3 1 -
RS庫存編號 669-7593
製造零件編號FZT957TA
HK$7.648
/個 (每包:5個)
單位
PNP 1 A 300 V SOT-223 Surface Mount 3 W 90 Single 300 V 6 V 85 MHz 3 + Tab 1 -
RS庫存編號 166-1312
製造零件編號BC857C,215
BrandNexperia
HK$0.10
個 (在毎卷:3000)
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 -
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 796-9681
製造零件編號BC338-16 A1
HK$0.303
/個 (每包:250個)
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 739-0335
製造零件編號SS8050DTA
HK$1.13
/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 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 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 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 177-5499
製造零件編號2N2907ACSM
BrandSemelab
HK$143.084
Each (In a Tray of 100)
單位
PNP 600 mA 60 V LCC 1 Surface Mount 500 mW 75 Single -60 V -5 V - 3 1 -
RS庫存編號 738-7584
製造零件編號2N2907ACSM
BrandSemelab
HK$231.43
單位
PNP 600 mA 60 V LCC 1 Surface Mount 500 mW 75 Single -60 V -5 V - 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 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 170-4155
製造零件編號BC546B A1
HK$0.187
Each (On a Tape of 4000)
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 163-1098
製造零件編號NSS40201LT1G
HK$0.911
個 (在毎卷:3000)
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 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 121-9550
製造零件編號DSS4240T-7
HK$0.528
個 (在毎卷:3000)
單位
NPN 2 A 40 V SOT-23 Surface Mount 600 mW 150 Single 40 V 5 V 100 MHz 3 1 -