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Transistors

Transistors

What are transistors?

A transistor is essentially a miniature semiconductor that can amplify or switch electronic signals and electrical power, acting as the gatekeeper in an electronic circuit. Typically, transistors consist of three layers of a semiconductor material.

Express Electronics have 10,000 products in stock and access to hundreds of thousands more, so we can find the transistor you need no matter how specialised the purpose.

Types of transistors 

Transistors typically fall into two main families: Bipolar Junction Transistors (BJTs) and Field-Effect Transistors (FETs). Both BJTs and FETs rely on specific semiconductor materials like silicon, geranium and gallium arsenide, each offering distinct applications.

Bipolar Junction Transistors (BJTs)

  • Structure: BJTs are made up of three layers of semiconductor material called the emitter, base, and collector. There are two types of BJTS- NPN (standing for negative-positive-negative) and PNP (standing for positive-negative-positive).
  • How they work: BJTs control the flow of current using two types of charges, electrons and holes. In an NPN transistor, electrons flow from the emitter to the collector, controlled by the base. In a PNP transistor, this process is reversed, with holes (the absence of electrons) flowing from the emitter to the collector.
  • Applications: BJTs are commonly used to amplify electrical signals or switch currents on and off.

 

Field-Effect Transistors (FETs):

  • Structure: FETs also have three terminals: the gate, drain and source.
  • Types: There are two primary types of FETs: Junction FETs (JFETs) and Metal-Oxide-Semiconductor FETs (MOSFET).
  • How they work: FETs control the flow of current by applying voltage to the gate, which changes the conductivity of a channel between the drain and source.
  • Applications: FETs are used in low-noise amplifiers, analog switches, and high-frequency circuits like those in microwave technology.

 

How to buy transistors 

Purchasing transistors from Express Electronics is simple and devoid of hassle. Simply contact us directly on +44 1904 656 923  or email sales@express-elect.com with a detailed list of your requirements.

Our professional team will help you select the best transistor for your unique needs, and can provide standard models of custom solutions.

Selling transistors

At Express Electronics, we also buy transistors and other electrical components. If you have any transistors lying around, we’re interested, and will pay cash in exchange for them. Simply call us at +44 1904 656 923  or email sales@express-elect.com and we’ll provide you with a competitive quote.

For any inquiries or further assistance, feel free to reach out to our committed team at Express Electronics. We are dedicated to providing you with high-quality components and excellent customer service including 1-year guarantees, worldwide delivery and the ability to source pretty much any electrical component you need.