What You Need to Know About Transistors

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The wonders of technology never cease to amaze. In today’s digital world, whether you’ve just picked up the latest iPhone, invested in an electric car, or received a pacemaker, you’re benefiting from the invention of the transistor.

Created in the late 1940s, the transistor transformed electronics, opening the door to smaller, faster, and more efficient devices. Quickly adopted across consumer products, transistors became the foundation of computer chips that power everything from everyday gadgets to complex systems, improving lives across America and around the globe.

Read on to discover more about the transistor and its continuing role in society.

What Are Transistors?

A transistor is a compact electronic component used in computers and countless other devices to amplify or switch electronic signals. When functioning as an amplifier, it receives a small current at one end and produces a significantly larger current at the other. This capability makes amplifying transistors essential in devices such as hearing aids.

Transistors also serve as switches: a small current triggers a much stronger one, activating the switching function. This principle is fundamental to the operation of modern computer chips.

Different Types of Transistors

There are three main types of transistors: bipolar junction transistors (BJTs), field-effect transistors (FETs), and insulated-gate bipolar transistors (IGBTs).

Bipolar transistors rely on both electrons and holes to carry charge. They are manufactured in two configurations: NPN and PNP.

Field-effect transistors are unipolar devices with no pn junction in the main current path. They are available in N-channel and P-channel variants.

Insulated-gate bipolar transistors combine a voltage-driven MOSFET (metal-oxide-semiconductor field-effect transistor) with a high-current transistor, offering efficient power control.

How Transistors Have Changed the World

The first working transistor was created in New Jersey in 1947. By 1960, transistors were integrated into numerous consumer products, including transistor radios and the first portable TVs in America. In 1983, Motorola introduced the world’s first cell phone, powered by transistors and priced at $3,995.

Before transistors, vacuum tubes were used to represent binary zeros and ones. This approach was inefficient, requiring large numbers of tubes, significant power, and generating excessive heat.

These tiny components now drive the computer chips that enable cars, smartphones, and countless other devices to operate efficiently and reliably.

As of 2026, every industry in America continues to benefit from transistor technology. In medicine, transistors are vital in pacemakers that regulate heart rhythms, while new developments, such as transistors made from linen thread, support advanced diagnostic monitoring.

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