Bipolar Transistors

Bipolar Transistors are a solid state, three-pin devices made from three layers of silicon. A bipolar transistor 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

Bipolar transistors are constructed 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.

How do bipolar transistors work?

Bipolar transistors have 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.

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.

They are also available as;

  • Digital transistors - are made of a semiconductor material, usually silicon, which conducts the current (or electricity) with little resistance. They also tend to have at least three terminals for easy connection to an external circuit.
  • UJT transistors - constructed of a bar of lightly dope N type silicone with a small piece of heavily doped P type material attached to one side. Since the silicon bar is lightly dope it has very high resistance.

Applications of bipolar transistors?

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 Minimum Operating Temperature
RS庫存編號 792-0872
製造零件編號BLT81,115
BrandNXP
HK$12.215
個 (在毎卷:2)
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NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W Single 20 V 2.5 V 900 MHz 3 + Tab 1 6.7 x 3.7 x 1.8mm -
RS庫存編號 165-9834
製造零件編號BLT81,115
BrandNXP
HK$9.642
個 (在毎卷:1000)
單位
NPN 500 mA 9.5 V SOT-223 Surface Mount 2 W Single 20 V 2.5 V 900 MHz 3 + Tab 1 6.7 x 3.7 x 1.8mm -
RS庫存編號 179-1060
製造零件編號BFT25A,215
BrandNXP
HK$1.901
個 (在毎卷:3000)
單位
NPN 7 mA 5 V SOT-23 (TO-236AB) Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 3 x 1.4mm -
RS庫存編號 626-2838
製造零件編號BFT25A,215
BrandNXP
HK$4.295
/個 (每包:10個)
單位
NPN 7 mA 5 V SOT-23 (TO-236AB) Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 3 x 1.4mm -65 °C
RS庫存編號 626-2535
製造零件編號BFG325W/XR,115
BrandNXP
HK$1.819
/個 (每包:10個)
單位
NPN 35 mA 6 V CMPAK Surface Mount 210 mW Single 15 V 2 V 14000 MHz 4 1 1 x 2.2 x 1.35mm -65 °C
RS庫存編號 509-453
製造零件編號PMD9003D,115
BrandNXP
HK$3.056
/個 (每包:20個)
單位
NPN - 50 V TSOP Surface Mount - - - 10 V - 6 2 3.1 x 1.7 x 1mm -65 °C
RS庫存編號 166-0549
製造零件編號PRF957,115
BrandNXP
HK$1.095
個 (在毎卷:3000)
單位
NPN 100 mA 10 V UMT Surface Mount 270 mW Single 20 V 1.5 V 8500 MHz 3 1 1 x 2.2 x 1.35mm -
RS庫存編號 725-8489
製造零件編號PDTA114EE,115
BrandNXP
HK$0.435
/個 (每包:200個)
單位
PNP - 50 V SOT-416 (SC-75) Surface Mount 150 mW Single - 10 V - 3 1 1.8 x 0.9 x 0.85mm -65 °C
RS庫存編號 165-8721
製造零件編號BFU725F/N1
BrandNXP
HK$1.274
個 (在毎卷:3000)
單位
NPN 40 mA 2.8 V SOT-343F Surface Mount 136 mW Single 10 V 1 V 12 GHz 4 1 2.2 x 1.35 x 1mm -
RS庫存編號 725-8483
製造零件編號PDTC114EE,115
BrandNXP
HK$0.435
/個 (每包:200個)
單位
NPN - 50 V SOT-416 (SC-75) Surface Mount 150 mW Single - 10 V - 3 1 1.8 x 0.9 x 0.85mm -65 °C
RS庫存編號 816-7801
製造零件編號BFU725F/N1
BrandNXP
HK$1.385
/個 (每包:30個)
單位
NPN 40 mA 2.8 V SOT-343F Surface Mount 136 mW Single 10 V 1 V 12 GHz 4 1 2.2 x 1.35 x 1mm -
RS庫存編號 626-2715
製造零件編號BFQ18A,115
BrandNXP
HK$4.902
/個 (每包:5個)
單位
NPN 150 mA 18 V UPAK Surface Mount 1 W Single 25 V 2 V 4000 MHz 4 1 1.6 x 4.6 x 2.6mm -65 °C
RS庫存編號 626-3342
製造零件編號PRF957,115
BrandNXP
HK$1.284
/個 (每包:10個)
單位
NPN 100 mA 10 V UMT Surface Mount 270 mW Single 20 V 1.5 V 8500 MHz 3 1 1 x 2.2 x 1.35mm -65 °C
RS庫存編號 626-2793
製造零件編號BFS25A,115
BrandNXP
HK$1.759
/個 (每包:10個)
單位
NPN 7 mA 5 V UMT Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 2.2 x 1.35mm -65 °C
RS庫存編號 166-0543
製造零件編號BFS25A,115
BrandNXP
HK$1.221
個 (在毎卷:3000)
單位
NPN 7 mA 5 V UMT Surface Mount 32 mW Single 8 V 2 V 5000 MHz 3 1 1 x 2.2 x 1.35mm -
RS庫存編號 166-0433
製造零件編號BFQ18A,115
BrandNXP
HK$3.891
個 (在毎卷:1000)
單位
NPN 150 mA 18 V UPAK Surface Mount 1 W Single 25 V 2 V 4000 MHz 4 1 1.6 x 4.6 x 2.6mm -
RS庫存編號 166-0540
製造零件編號BFG325W/XR,115
BrandNXP
HK$1.16
個 (在毎卷:3000)
單位
NPN 35 mA 6 V CMPAK Surface Mount 210 mW Single 15 V 2 V 14000 MHz 4 1 1 x 2.2 x 1.35mm -