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 826-8490
製造零件編號2SD2656T106
BrandROHM
HK$1.89
/個 (每包:40個)
單位
NPN 1 A 30 V SOT-323 (SC-70) Surface Mount 200 mW 270 Single 30 V 6 V 100 MHz 3 1 -
RS庫存編號 122-0641
製造零件編號ZXTP2041FTA
HK$0.806
個 (在毎卷:3000)
單位
PNP 1 A 40 V SOT-23 Surface Mount 350 mW 30 Single -40 V -5 V 300 MHz 3 1 -
RS庫存編號 822-2504
製造零件編號DJT4031N-13
HK$2.662
/個 (每包:25個)
單位
NPN 3 A 40 V SOT-223 Surface Mount 1.2 W 220 Single 40 V 6 V 105 MHz 3 + Tab 1 -
RS庫存編號 146-0543
製造零件編號BC846W
BrandNexperia
HK$0.097
個 (在毎卷:3000)
單位
NPN 100 mA 65 V SOT-323 (SC-70) Surface Mount 200 mW 110 Single 80 V 6 V 100 MHz 3 1 -
RS庫存編號 781-3967
製造零件編號BCW65ALT1G
HK$0.317
Each (On a Tape of 200)
單位
NPN 800 mA 32 V SOT-23 Surface Mount 225 mW 35 Single 60 V dc 5 V 100 MHz 3 1 -
RS庫存編號 801-5586
製造零件編號PBHV9050Z,115
BrandNexperia
HK$3.41
Each (On a Tape of 10)
單位
PNP 250 mA 500 V SOT-223 Surface Mount 1.4 W 70 Single -500 V -6 V 100 MHz 3 + Tab 1 -
RS庫存編號 166-0510
製造零件編號PBSS4160T,215
BrandNexperia
HK$0.501
個 (在毎卷:3000)
單位
NPN 900 mA 60 V SOT-23 (TO-236AB) Surface Mount 1.25 W 100 Single 80 V 5 V 220 MHz 3 1 -
RS庫存編號 125-0065
製造零件編號MJ15016G
HK$22.968
Each (In a Tray of 100)
單位
PNP 15 A 120 V TO-204AA Through Hole 180 W 5 Single 200 V 7 V 1 MHz 2 1 -
RS庫存編號 171-5397
製造零件編號DTC043TEBTL
BrandROHM
HK$0.167
個 (在毎卷:3000)
單位
NPN 100 mA 50 (Minimum) V SOT-416FL Surface Mount 150 mW 100 Single 50 (Minimum) V 5 (Minimum) V 250 MHz 3 1 -
RS庫存編號 807-9997
製造零件編號MUN5330DW1T1G
HK$0.425
/個 (每包:500個)
單位
NPN + PNP 100 mA 50 V SOT-363 (SC-88) Surface Mount 385 mW 3 Isolated 50 V dc 6 V 10 kHz 6 2 -
RS庫存編號 809-1470
製造零件編號MJD340T4
HK$3.287
Each (On a Tape of 25)
單位
NPN 500 mA 300 V DPAK (TO-252) Surface Mount 15 W 30 Single 300 V 3 V - 3 1 -
RS庫存編號 163-2509
製造零件編號MMBTA92LT1G
HK$0.196
個 (在毎卷:3000)
單位
PNP 500 mA 300 V SOT-23 Surface Mount 300 mW 25 Single 300 V 5 V 50 MHz 3 1 -
RS庫存編號 177-6733
製造零件編號SST2907AT116
BrandROHM
HK$0.383
/個 (每包:200個)
單位
PNP 600 mA -60 V SOT-23 Surface Mount 350 mW 50 Single -60 V -5 V - 3 1 -
RS庫存編號 303-1596
製造零件編號BC847BW,115
BrandNexperia
HK$0.993
/個 (每包:10個)
單位
NPN 100 mA 45 V UMT Surface Mount 200 mW 200 Single 50 V 6 V 100 MHz 3 1 -
RS庫存編號 822-2144
製造零件編號BC847BVN-7
HK$1.663
/個 (每包:50個)
單位
NPN + PNP 100 mA 45 V SOT-563 Surface Mount 150 mW 200 Isolated 50 V 6 V 100 (Min.) MHz 6 2 -
RS庫存編號 162-9309
製造零件編號CPH6003A-TL-E
HK$1.442
個 (在毎卷:3000)
單位
NPN 150 mA 12 V CPH Surface Mount 800 mW 100 Single 20 V 2 V 1 GHz 6 1 -
RS庫存編號 806-1283
製造零件編號NZT753
HK$3.395
/個 (每包:20個)
單位
PNP 4 A 100 V SOT-223 Surface Mount 1.2 W 100 Single -120 V -5 V 100 MHz 3 + Tab 1 -
RS庫存編號 122-0626
製造零件編號MMBT2907A-7-F
HK$0.151
個 (在毎卷:3000)
單位
PNP 600 mA 60 V SOT-23 Surface Mount 300 mW 50 Single -60 V -5 V - 3 1 -
RS庫存編號 166-3525
製造零件編號FZT649
HK$1.513
個 (在毎卷:4000)
單位
NPN 3 A 25 V SOT-223 Surface Mount 2 W 100 Single 35 V 5 V - 3 + 1 (Tab) 1 -
RS庫存編號 151-2827
製造零件編號PMBT2907A,215
BrandNexperia
HK$0.299
/個 (每包:250個)
單位
PNP -600 mA -60 V SOT23, TO-236AB Surface Mount 250 mW 50 Single -60 V -5 V 200 (Min) MHz 3 1 AEC-Q101