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 Stock No. 215-6600
Mfr. Part No.FZT849TA
HK$8.36
Each
units
NPN 7 A 30 V SOT-223 Surface Mount 3 W Single 80 V 6 V 100 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -55 °C
RS Stock No. 669-7593
Mfr. Part No.FZT957TA
HK$9.308
Each (In a Pack of 5)
units
PNP 1 A 300 V SOT-223 Surface Mount 3 W Single 300 V 6 V 85 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -55 °C
RS Stock No. 751-4290
Mfr. Part No.DSS4240T-7
HK$1.198
Each (On a Tape of 100)
units
NPN 2 A 40 V SOT-23 Surface Mount 600 mW Single 40 V 5 V 100 MHz 3 1 3 x 1.4 x 1.1mm -55 °C
RS Stock No. 121-9550
Mfr. Part No.DSS4240T-7
HK$0.629
Each (On a Reel of 3000)
units
NPN 2 A 40 V SOT-23 Surface Mount 600 mW Single 40 V 5 V 100 MHz 3 1 3 x 1.4 x 1.1mm -
RS Stock No. 121-9416
Mfr. Part No.FZT849TA
HK$4.158
Each (On a Reel of 1000)
units
NPN 7 A 30 V SOT-223 Surface Mount 3 W Single 80 V 6 V 100 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -
RS Stock No. 121-9987
Mfr. Part No.FZT957TA
HK$4.454
Each (On a Reel of 1000)
units
PNP 1 A 300 V SOT-223 Surface Mount 3 W Single 300 V 6 V 85 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -
RS Stock No. 166-0392
Mfr. Part No.FCX491ATA
HK$1.753
Each (On a Reel of 1000)
units
NPN 1 A 40 V SOT-89 Surface Mount 1 W Single 40 V 5 V 150 MHz 3 1 1.5 x 4.5 x 2.5mm -
RS Stock No. 669-7521
Mfr. Part No.FCX491ATA
HK$3.244
Each (In a Pack of 25)
units
NPN 1 A 40 V SOT-89 Surface Mount 1 W Single 40 V 5 V 150 MHz 3 1 1.5 x 4.5 x 2.5mm -65 °C
RS Stock No. 922-7740
Mfr. Part No.ZTX753
HK$3.487
Each (In a Bag of 4000)
units
PNP 2 A 100 V E-Line Through Hole 1 W Single 120 V 5 V 140 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 295-523
Mfr. Part No.ZTX751
HK$7.818
Each (In a Pack of 5)
units
PNP 2 A 60 V E-Line Through Hole 1 W Single 80 V 5 V 140 MHz 3 1 4.01 x 4.77 x 2.41mm -55 °C
RS Stock No. 165-8848
Mfr. Part No.2DD2656-7
HK$0.476
Each (On a Reel of 3000)
units
NPN 1 A 30 V SOT-323 (SC-70) Surface Mount 500 mW Single 30 V 6 V 270 MHz 3 1 2.2 x 1.35 x 1mm -
RS Stock No. 922-7746
Mfr. Part No.ZTX751
HK$3.487
Each (In a Box of 4000)
units
PNP 2 A 60 V E-Line Through Hole 1 W Single 80 V 5 V 140 MHz 3 1 4.01 x 4.77 x 2.41mm -
RS Stock No. 669-7357
Mfr. Part No.FZT857TA
HK$8.682
Each (In a Pack of 5)
units
NPN 3.5 A 300 V SOT-223 Surface Mount 3 W Single 350 V 6 V 80 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -55 °C
RS Stock No. 922-7901
Mfr. Part No.FZT949TA
HK$3.873
Each (On a Reel of 1000)
units
PNP 5.5 A 30 V SOT-223 Surface Mount 3 W Single 50 V 6 V 100 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -
RS Stock No. 822-8988
Mfr. Part No.BC846AW-7-F
HK$0.62
Each (In a Pack of 250)
units
NPN 100 mA 65 V SOT-323 (SC-70) Surface Mount 200 mW Single 80 V 6 V 100 MHz 3 1 2.2 x 1.35 x 1mm -
RS Stock No. 823-1293
Mfr. Part No.DXT5551-13
HK$3.129
Each (In a Pack of 50)
units
NPN 600 mA 160 V SOT-89 Surface Mount 1.2 W Single 180 V 6 V 300 MHz 3 1 4.6 x 2.6 x 1.6mm -
RS Stock No. 751-5445
Mfr. Part No.ZXTN25100BFHTA
HK$4.179
Each (In a Pack of 25)
units
NPN 3 A 100 V SOT-23 Surface Mount 1.81 W Single 170 V 7 V 160 MHz 3 1 3.05 x 1.4 x 1mm -55 °C
RS Stock No. 669-7509
Mfr. Part No.FZT949TA
HK$8.894
Each (In a Pack of 5)
units
PNP 5.5 A 30 V SOT-223 Surface Mount 3 W Single 50 V 6 V 100 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm -55 °C
RS Stock No. 822-8644
Mfr. Part No.2DD2656-7
HK$1.004
Each (In a Pack of 100)
units
NPN 1 A 30 V SOT-323 (SC-70) Surface Mount 500 mW Single 30 V 6 V 270 MHz 3 1 2.2 x 1.35 x 1mm -
RS Stock No. 165-8684
Mfr. Part No.DXT5551-13
HK$1.071
Each (On a Reel of 2500)
units
NPN 600 mA 160 V SOT-89 Surface Mount 1.2 W Single 180 V 6 V 300 MHz 3 1 4.6 x 2.6 x 1.6mm -