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 Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Dimensions Maximum Base Emitter Saturation Voltage
RS庫存編號 792-5158
製造零件編號2SD1816T-TL-H
HK$6.07
/個 (每包:10個)
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NPN 4 A 100 V TP-FA Surface Mount 20 W Single 120 V 6 V 180 MHz 3 1 6.5 x 5.5 x 2.3mm 1.2 V
RS庫存編號 463-183
製造零件編號BCX17LT1G
HK$0.48
/個 (每包:100個)
單位
PNP 500 mA 45 V SOT-23 Surface Mount 300 mW Single 50 V 5 V - 3 1 0.94 x 2.9 x 1.3mm -
RS庫存編號 186-7413
製造零件編號MJE5850G
HK$21.774
毎管:50 個
單位
PNP 8 (Continuous) A, 16 (Peak) A 350 V dc TO-220 Through Hole 80 W Single - 6 V dc 1 kHz 3 1 10.53 x 4.83 x 15.75mm 1.5 V dc
RS庫存編號 826-9367
製造零件編號BFP182WH6327XTSA1
BrandInfineon
HK$0.988
/個 (每包:100個)
單位
NPN 35 mA 12 V SOT-343 Surface Mount 250 mW Single 20 V 2 V 8 GHz 4 1 2 x 1.25 x 0.8mm -
RS庫存編號 103-8115
製造零件編號BC857CT,115
BrandNexperia
HK$0.359
個 (在毎卷:3000)
單位
PNP 100 mA 45 V SOT-416 (SC-75) Surface Mount 150 mW Single -50 V -5 V - 3 1 1.8 x 0.9 x 0.85mm -
RS庫存編號 725-8537
製造零件編號BC859B,215
BrandNexperia
HK$0.67
/個 (每包:100個)
單位
PNP 100 mA 30 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 30 V 5 V - 3 1 1 x 3 x 1.4mm 0.85 V
RS庫存編號 801-5678
製造零件編號PMBT3904M,315
BrandNexperia
HK$1.38
/個 (每包:50個)
單位
NPN 200 mA 40 V SOT-883 Surface Mount 590 mW Single 60 V 6 V 100 MHz 3 1 1.02 x 0.62 x 0.5mm 950 mV
RS庫存編號 802-4534
製造零件編號MJB41CG
HK$9.33
/個 (每包:10個)
單位
NPN 6 A 100 V D2PAK (TO-263) Surface Mount 65 W Single 100 V dc 5 V 1 MHz 3 1 10.29 x 9.65 x 4.83mm -
RS庫存編號 826-8342
製造零件編號2SA2094TLQ
BrandROHM
HK$3.265
/個 (每包:30個)
單位
PNP 2 A 60 V SOT-346T (SC-96) Surface Mount 500 mW Single -60 V -6 V 100 MHz 3 1 3 x 1.8 x 0.95mm -
RS庫存編號 808-4135
製造零件編號NSV40301MZ4T1G
HK$4.50
/個 (每包:25個)
單位
NPN 3 A 40 V SOT-223 Surface Mount 2 W Single 40 V 6 V 1 MHz 3+Tab 1 6.7 x 3.7 x 1.65mm 1 V
RS庫存編號 781-3957
製造零件編號BC847ALT1G
HK$0.284
/個 (每包:200個)
單位
NPN 100 mA 45 V SOT-23 Surface Mount 300 mW Single 50 V dc 6 V 100 MHz 3 1 3.04 x 2.64 x 1.11mm -
RS庫存編號 166-1043
製造零件編號BDP953H6327XTSA1
BrandInfineon
HK$2.69
個 (在毎卷:1000)
單位
NPN 3 A 100 V SOT-223 Surface Mount 5 W Single 120 V 5 V - 3 + Tab 1 6.5 x 3.5 x 1.6mm 1.3 V
RS庫存編號 791-9386
製造零件編號CPH6122-TL-E
HK$2.606
/個 (每包:20個)
單位
PNP 3 A 30 V CPH Surface Mount 1.3 W Single -30 V -5 V 1 MHz 6 1 2.9 x 1.6 x 0.9mm -1.2 V
RS庫存編號 145-3552
製造零件編號2N6107G
HK$5.52
毎管:50 個
單位
PNP 10 A 70 V TO-220AB Through Hole 40 W Single 80 V dc 5 V 10 MHz 3 1 10.28 x 4.82 x 15.75mm -
RS庫存編號 805-1113
製造零件編號2N5551TF
HK$0.578
/個 (每包:200個)
單位
NPN 600 mA 160 V TO-92 Through Hole 625 mW Single 180 V 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm 1 V
RS庫存編號 184-4954
製造零件編號MJ2955G
HK$45.742
/個 (每包:10個)
單位
PNP 15 (Continuous) A 70 V dc TO-204AA Through Hole 115 W Single 100 V dc 7 V dc 1 MHz 3 1 39.37 x 26.67 x 8.51mm -
RS庫存編號 124-5390
製造零件編號NJW0302G
HK$19.181
毎管:30 個
單位
PNP 15 A 250 V TO-3P Through Hole 150 W Single 250 V dc 5 V 1 MHz 3 1 15.8 x 5 x 20.1mm -
RS庫存編號 793-0951
製造零件編號MPS2222ARLRAG
HK$1.686
/個 (每包:50個)
單位
NPN 600 mA 40 V TO-92 Through Hole 625 mW Single 75 V dc 6 V 100 MHz 3 1 5.2 x 4.19 x 5.33mm 2 V dc
RS庫存編號 790-5334
製造零件編號MJD210T4G
HK$3.615
/個 (每包:10個)
單位
PNP 5 A 25 V DPAK (TO-252) Surface Mount 12.5 W Single 40 V dc 8 V 10 MHz 3 1 6.73 x 6.22 x 2.38mm 2.5 V dc
RS庫存編號 802-3666
製造零件編號MAT12AHZ
HK$279.83
單位
NPN 20 mA 10 V TO-78 Through Hole - Isolated 15 V - 200 MHz 6 2 9.4 (Dia.) x 4.7mm -