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 Maximum Base Emitter Saturation Voltage
RS Stock No. 145-4630
Mfr. Part No.TIP32ATU
MYR1.822
Each (In a Tube of 50)
units
PNP 3 A 60 V TO-220 Through Hole 40 W Single -60 V -5 V 1 MHz 3 1 10.67 x 4.83 x 16.51mm -
RS Stock No. 110-7459
Mfr. Part No.BFR182WH6327XTSA1
BrandInfineon
MYR1.70
Each (In a Pack of 60)
units
NPN 35 mA 12 V SOT-23 Surface Mount 250 mW Single 20 V 2 V - 3 1 2.9 x 1.3 x 0.9mm -
RS Stock No. 145-4545
Mfr. Part No.FJP3305H1TU
MYR2.723
Each (In a Tube of 50)
units
NPN 4 A 400 V TO-220 Through Hole 75 W Single 700 V 9 V - 3 1 10.67 x 4.83 x 16.51mm -
RS Stock No. 802-2963
Mfr. Part No.BD13816STU
MYR1.52
Each (In a Pack of 20)
units
PNP 1.5 A 60 V TO-126 Through Hole 12.5 W Single -60 V -5 V - 3 1 8 x 3.25 x 11mm -
RS Stock No. 163-2710
Mfr. Part No.PZTA92T1G
MYR0.409
Each (On a Reel of 1000)
units
PNP 500 mA 300 V SOT-223 Surface Mount 1.5 W Single 300 V 5 V 50 MHz 3 + Tab 1 1.57 x 6.5 x 3.5mm -
RS Stock No. 166-3456
Mfr. Part No.FSB660A
MYR0.477
Each (On a Reel of 3000)
units
PNP 2 A 60 V SOT-23 Surface Mount 500 mW Single -60 V -5 V 75 MHz 3 1 2.92 x 1.4 x 0.94mm -
RS Stock No. 166-0369
Mfr. Part No.PUMB10,115
BrandNexperia
MYR0.157
Each (On a Reel of 3000)
units
PNP - 50 V UMT Surface Mount - Isolated - 10 V - 6 2 2.2 x 1.35 x 1mm -
RS Stock No. 166-0266
Mfr. Part No.PDTA144ET,215
BrandNexperia
MYR0.098
Each (On a Reel of 12000)
units
PNP - 50 V SOT-23 (TO-236AB) Surface Mount - Single - 10 V - 3 1 3 x 1.4 x 1mm -
RS Stock No. 146-7140
Mfr. Part No.2SAR554RTL
BrandROHM
MYR1.89
Each (In a Pack of 50)
units
PNP 1.5 A 80 V SOT-346T (SC-96) Surface Mount 1 W Single -80 V -6 V 340 MHz 3 1 3 x 1.8 x 0.95mm -
RS Stock No. 168-3653
Mfr. Part No.DSC7101S0L
BrandPanasonic
MYR0.945
Each (On a Reel of 1000)
units
NPN 500 mA 80 V MiniP3 F2 B Surface Mount 1 W Single 80 V 5 V 150 MHz 3 1 4.5 x 2.5 x 1.5mm -
RS Stock No. 790-5488
Mfr. Part No.NSV60601MZ4T1G
MYR1.432
Each (In a Pack of 10)
units
NPN 6 A 60 V SOT-223 Surface Mount 2 W Single 100 V dc 6 V 1 MHz 3 + Tab 1 6.7 x 3.7 x 1.65mm -
RS Stock No. 816-6802
Mfr. Part No.PMBT6429,215
BrandNexperia
MYR0.212
Each (In a Pack of 100)
units
NPN 100 mA 45 V SOT-23 Surface Mount 250 mW Single 55 V 6 V 100 MHz 3 1 3 x 1.4 x 1mm -
RS Stock No. 857-8249
Mfr. Part No.BCR10PNH6727XTSA1
BrandInfineon
MYR0.237
Each (On a Reel of 3000)
units
NPN + PNP - 50 V SOT-363 (SC-88) Surface Mount 250 mW Isolated - 10 V - 6 2 2 x 1.25 x 0.8mm -
RS Stock No. 739-0325
Mfr. Part No.SS8550DBU
MYR0.694
Each (In a Pack of 10)
units
PNP 1.5 A 25 V TO-92 Through Hole 1 W Single -40 V -6 V 200 MHz 3 1 - -
RS Stock No. 186-7156
Mfr. Part No.FDMS3624S
MYR3.708
Each (On a Reel of 3000)
units
- - - PQFN Surface Mount 2.5 W - - - - 8 2 6.25 x 5.1 x 1.05mm -
RS Stock No. 166-1351
Mfr. Part No.PBRN113ZT,215
BrandNexperia
MYR0.213
Each (On a Reel of 3000)
units
NPN - 40 V SOT-23 (TO-236AB) Surface Mount - Single - 5 V - 3 1 3 x 1.4 x 1mm -
RS Stock No. 186-7186
Mfr. Part No.MUN5214T1G
MYR0.107
Each (On a Reel of 3000)
units
NPN - 50 V dc SC-70 Surface Mount 310 mW Single - - - 3 1 2.2 x 1.35 x 0.9mm -
RS Stock No. 124-2282
Mfr. Part No.BC847B,215
BrandNexperia
MYR0.066
Each (On a Reel of 3000)
units
NPN 100 mA 45 V SOT-23 (TO-236AB) Surface Mount 250 mW Single 50 V 6 V 100 MHz 3 1 1 x 3 x 1.4mm -
RS Stock No. 922-7803
Mfr. Part No.FZT951TA
MYR1.84
Each (On a Reel of 1000)
units
PNP 5 A 60 V SOT-223 Surface Mount 3 W Single 100 V 6 V 120 MHz 3 + Tab 1 1.6 x 6.5 x 3.5mm -
RS Stock No. 184-1097
Mfr. Part No.SMMBT5551LT1G
MYR0.296
Each (On a Reel of 3000)
units
NPN 600 mA 160 V SOT-23 Surface Mount 300 mW Single 160 V 6 V - 3 1 3.04 x 1.4 x 1.01mm -