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What is a Bipolar Transistor?

Bipolar transistors are often used for amplification of digital or analog signals. They can also switch direct current or work as an oscillator. An NPN bipolar transistor has 1 layer of P-type material between 2 layers of N-type material, whereas a PNP bipolar transistor has 1 layer of N-type semiconductor between 2 layers of P-type material. In N-type material, the charge carriers are mostly electrons, whereas in P-type material, the electric charges are mostly carried in the form of electron deficiencies.

Types of Bipolar Transistors

There are many different kinds of bipolar transistors and at Future Electronics we stock many of the most common types categorized by Polarity, Total Power Dissipation, Collector Current @ 100C, Maximum CE Voltage, Packaging type and Minimum DC Current Gain. The parametric filters on our website can help refine your search results depending on the required specifications.

The most common sizes for Maximum CE Voltage are 60 V, 80 V, and 100 V. We also carry bipolar transistors with Maximum CE Voltage as high as 3000 V. Minimum DC Current Gain can be between 4 and 10000, with the most common bipolar transistors having a Minimum DC Current Gain of 25 or 100.

Bipolar Transistors from Future Electronics

Future Electronics has a full selection of bipolar transistors when looking for a bipolar junction transistor, bipolar transistor switch, insulated gate bipolar transistor, BJT transistor, NPN transistor or high voltage transistor for your bipolar transistor circuits. Simply choose from the bipolar transistor technical attributes below and your search results will quickly be narrowed to match your specific bipolar transistor application needs.

We deal with Diodes Inc., Fairchild, ON Semiconductor and STMicroelectronics, among other manufacturers. You can easily refine your bipolar transistor product search results by clicking your preferred bipolar transistor brand below from our list of manufacturers.

Applications for Bipolar Transistors:

Bipolar Transistors can be used in:

  • Audio, linear and switching applications
  • Emergency lighting
  • Voltage regulators
  • Relay drivers

Choosing the Right Bipolar Transistor:

When you are looking for the right bipolar transistors, with the FutureElectronics.com parametric search, you can filter the results by various attributes: by Polarity (NPN, NPN/PNP, PNP), Maximum CE Voltage (10 V, 60 V, 80 V, 100 V,…) and Minimum DC Current Gain (from 4 to 10000) to name a few. You will be able to find the right bipolar transistor switch, bipolar junction transistor, insulated gate bipolar transistor, BJT transistor or high voltage transistor for your circuits.

Bipolar Transistors in Production Ready Packaging or R&D Quantities

If the quantity of bipolar transistors required is less than a full reel, we offer customers many of our products in tube or tray quantities that will avoid unneeded surplus.

In addition, Future Electronics offers clients a unique bonded inventory program that is designed to eliminate potential problems that may arise from an unpredictable supply of products containing raw metals and products with erratic or long lead times. Talk with your nearest Future Electronics branch and find out more on how you and your company can avoid possible shortages.



Bipolar Transistors By Manufacturer Name:

Bipolar Transistors by Primary Attributes:

By Power Dissipation-Tot




By DC Current Gain-Min





Manufacturer Part Number Description
Diodes Inc. BC846B-7-F BC846B Series NPN 65 V 300 mW Small Signal Transistor Surface Mount - SOT-23-3
Diodes Inc. BC807-40-7-F TRANS PNP BIPOLAR 45V SOT23-3
Diodes Inc. DDTA113ZCA-7-F PREBIASED TRANSISTOR SOT-23 R1<>R2 PNP 200MW 1KOhms 10KOhms
Diodes Inc. MMDT3906-7-F MMDT3906 Series Dual PNP 40 V 200 mW Small Signal Transistor SMT - SOT-363-6
Fairchild 4249_NB42112B MMBTH10 Series NPN 225 mW 25 V 50 mA Surface Mount RF Transistor - SOT-23
Fairchild BCV72 NPN 500 mW 60 V 500 mA Surface Mount General Purpose Transistor - SOT-23-3
Fairchild 2N3904TFR 2N3904 Series 40 V CE Breakdown 0.2 A NPN General Purpose Amplifier - TO-92
Fairchild MMBTH10 MMBTH10 Series NPN 225 mW 25 V 50 mA SMT RF Transistor - SOT-23-3
ON Semiconductor MMBTA56LT3G MMBT Series 80 V 500 mA Surface Mount PNP Silicon Driver Transistor - SOT-23
ON Semiconductor MMBTA06LT3G MMBT Series 80 V 500 mA Surface Mount NPN Silicon Driver Transistor - SOT-23
ON Semiconductor MMBTA92LT1G MMBT Series 300 V 50 mA Surface Mount PNP Silicon Transistor - SOT-23
ON Semiconductor MMBTA06LT1G MMBT Series 80 V 500 mA Surface Mount NPN Silicon Driver Transistor - SOT-23
ON Semiconductor MMBTA42LT1G MMBT Series 300 V 50 mA SMT NPN Silicon Transistor - SOT-23
ON Semiconductor MMBT5551LT1G MMBT Series 160 V 60 mA SMT NPN Silicon Transistor - SOT-23
ON Semiconductor MPSA42G MPSA Series 300 V 50 mA Through Hole NPN Silicon Transistor - TO-92
ON Semiconductor SMMBTA56LT3G MMBT Series 80 V 500 mA Surface Mount PNP Silicon Driver Transistor - SOT-23
ON Semiconductor PZT751T1G PZT Series 60 V 2 A SMT PNP Silicon Planar Epitaxial Transistor - TO-261AA
ON Semiconductor PZTA96ST1G PZT Series 450 V 500 mA SMT PNP Silicon Transistor - SOT-223
ON Semiconductor BCP56-10T1G BCP Series 80 V 1.5 A Surface Mount NPN Silicon Epitaxial Transistor - SOT-223
ON Semiconductor 2N5401G 2N Series 150 V 600 mA Through Hole PNP Silicon Amplifier Transistor - TO-92
STMicroelectronics MD2001FX MD2001FX Series NPN 700 V 12 A Definition CRT Display Transistor - ISOWATT-218FX
STMicroelectronics MJD47T4 MJD47 Series NPN 250 V 1 A High Voltage Fast-Switching Power Transistor - TO-252
STMicroelectronics MD2001FX MD2001FX Series NPN 700 V 12 A Definition CRT Display Transistor - ISOWATT-218FX
STMicroelectronics TIP31C TIP31C Series NPN 100 V 3 A Power Transistor Through Hole - TO-220
STMicroelectronics STSA1805 STSA1805 Series NPN 60 V 5 A Fast-Switching Power Transistor - TO-92

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