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 121-6416
製造零件編號MJF44H11G
HK$11.12
毎管:50 個
單位
NPN 10 A 80 V TO-220FP Through Hole 36 W 40 Single 10 V dc 5 V 20 MHz 3 1 -
RS庫存編號 751-5164
製造零件編號ZHB6790TA
HK$21.65
/個 (每包:5個)
單位
NPN + PNP 2 A 40 V SM Surface Mount 2 W 150 (NPN), 150 (PNP) Full Bridge -50 V, 50 V -5 (PNP) V, 5 (NPN) V 100 (PNP) MHz, 150 (NPN) MHz 8 4 -
RS庫存編號 823-1864
製造零件編號ZX5T853GTA
HK$6.47
/個 (每包:10個)
單位
NPN 6 A 100 V SOT-223 Surface Mount 3 W 300 Single 200 V 7 V 130 MHz 3 + Tab 1 -
RS庫存編號 122-0262
製造零件編號MMBT5551-7-F
HK$0.273
個 (在毎卷:3000)
單位
NPN 600 mA 160 V SOT-23 Surface Mount 300 mW 30 Single 180 V 6 V 300 MHz 3 1 -
RS庫存編號 792-5114
製造零件編號2SD1624T-TD-E
HK$4.233
Each (On a Tape of 25)
單位
NPN 3 A 50 V PCP Surface Mount 1.5 W 35 Single 60 V 6 V 150 MHz 3 1 -
RS庫存編號 792-5101
製造零件編號2SD1623S-TD-E
HK$4.027
/個 (每包:25個)
單位
NPN 2 A 50 V PCP Surface Mount 1.3 W 40 Single 60 V 6 V 150 MHz 3 1 -
RS庫存編號 169-0612
製造零件編號ZXTP19100CGTA
HK$2.793
個 (在毎卷:1000)
單位
PNP 2 A 100 V SOT-223 Surface Mount 10.2 W 20 Single -110 V -7 V 142 MHz 3 + Tab 1 -
RS庫存編號 151-3041
製造零件編號PHPT60406PYX
BrandNexperia
HK$2.08
個 (在毎卷:1500)
單位
PNP -6 A -40 V LFPAK56, SOT669 Surface Mount 25 W 50 Single -40 V -8 V 110 MHz 4 + Tab 1 AEC-Q101
RS庫存編號 186-8482
製造零件編號BC849BLT1G
HK$0.273
/個 (每包:100個)
單位
NPN 100 mA 30 V dc SOT-23 Surface Mount 300 mW 200 Single 30 V dc 5 V dc 100 MHz 3 1 AEC-Q101
RS庫存編號 178-7142
製造零件編號BC847,215
BrandNexperia
HK$0.149
個 (在毎卷:3000)
單位
- - - - - - - - - - - - - -
RS庫存編號 178-7614
製造零件編號SMMBTA56LT1G
HK$0.539
個 (在毎卷:3000)
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 756-0209
製造零件編號2SA2065(TE85L,F)
BrandToshiba
HK$2.791
/個 (每包:10個)
單位
PNP 1.5 A 20 V TSM Surface Mount 750 mW 125 Single -20 V -7 V - 3 1 -
RS庫存編號 663-8525
製造零件編號2SC3332S-AA
BrandSanyo
HK$3.44
/個 (每包:5個)
單位
NPN 700 mA 160 V NP Through Hole 700 mW 140 - 180 V 6 V 120 MHz 3 1 -
RS庫存編號 168-2029
製造零件編號DTC014EEBTL
BrandROHM
HK$0.423
/個 (每包:250個)
單位
NPN 100 mA - SOT-416FL Surface Mount 150 mW 35 Single - - 250 MHz 3 1 -
RS庫存編號 122-2421
製造零件編號ZX5T851GTA
HK$3.47
個 (在毎卷:1000)
單位
NPN 6 A 60 V SOT-223 Surface Mount 12.8 W 300 Single 150 V 7 V 130 MHz 3 + Tab 1 -
RS庫存編號 178-7050
製造零件編號BCX52,115
BrandNexperia
HK$0.776
個 (在毎卷:1000)
單位
PNP 1 A 60 V SOT-89 Surface Mount 1.35 W 63 Single -60 V -5 V 145 MHz 3 1 -
RS庫存編號 170-9007
製造零件編號APT27HZTR-G1
HK$0.573
Each (On a Tape of 2000)
單位
NPN - - TO-92 Through Hole 800 mW - Single - - - 3 1 -
RS庫存編號 826-8960
製造零件編號BFP420H6327XTSA1
BrandInfineon
HK$2.708
/個 (每包:50個)
單位
NPN 60 mA 15 V SOT-343 Surface Mount 210 mW 60 Single 15 V 1.5 V 25 GHz 4 1 -
RS庫存編號 169-7356
製造零件編號MMBT2222ALP4-7B
HK$0.334
個 (在毎卷:10000)
單位
NPN 600 mA 40 V DFN Surface Mount 1 W 100 Single 75 V 6 V 300 MHz 3 1 -
RS庫存編號 800-9254
製造零件編號2SA2040-TL-E
HK$4.342
Each (On a Tape of 25)
單位
PNP 8 A 50 V TP-FA Through Hole 15 W 200 Single -50 V -6 V 290 MHz 3 1 -