{"id":5002,"date":"2026-01-22T10:49:14","date_gmt":"2026-01-22T01:49:14","guid":{"rendered":"https:\/\/agus.co.jp\/en\/?p=5002"},"modified":"2026-01-22T10:49:14","modified_gmt":"2026-01-22T01:49:14","slug":"what-is-a-transistor-this-article-explains-types-and-what-they-are-used-for","status":"publish","type":"post","link":"https:\/\/agus.co.jp\/en\/?p=5002","title":{"rendered":"What is a transistor? This article explains types and what they are used for!"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic1-2-1-1024x576.jpg\" alt=\"\" class=\"wp-image-5003\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic1-2-1-1024x576.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic1-2-1-300x169.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic1-2-1-768x432.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic1-2-1-1536x864.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic1-2-1.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The \u2018transistor\u2019 is famous by name, but do you know what it is actually used for?<\/p>\n\n\n\n<p>In fact, it is an item that has revolutionized the electronics world.<\/p>\n\n\n\n<p>This article focuses on such transistors, explaining types and what they are used for!<\/p>\n\n\n\n<p>We&#8217;ve tried to give you a simple terms explanation and hope it helps you if you&#8217;re wondering what a transistor looks like.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Transistors are useful items with two functions.<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"593\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic2-2-1-1024x593.jpg\" alt=\"\" class=\"wp-image-5004\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic2-2-1-1024x593.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic2-2-1-300x174.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic2-2-1-768x445.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic2-2-1-1536x890.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic2-2-1.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Transistors have two main functions.<\/p>\n\n\n\n<p>Switching the circuit on and off (acting as a switch)<\/p>\n\n\n\n<p>Amplify the signal<\/p>\n\n\n\n<p>They are characterized by their extremely small size and are used in many electronic components due to their high heat resistance temperatures, which is a result of the use of silicon.<\/p>\n\n\n\n<p>Transistors, in general, refer to \u2018bipolar transistors\u2019, but recently \u2018unipolar transistors\u2019 have become increasingly popular.<\/p>\n\n\n\n<p>The next section looks at this in more detail!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Type of transistor<\/h2>\n\n\n\n<p>Transistors are divided into several types.<\/p>\n\n\n\n<p>Let&#8217;s discuss the three most commonly used types.<\/p>\n\n\n\n<p>The three most commonly used transistors are<\/p>\n\n\n\n<p>\u30fbBipolar transistor<\/p>\n\n\n\n<p>\u30fbUnipolar transistor<\/p>\n\n\n\n<p>\u30fbPhoto transistor<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bipolar transistor<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic5-1-1024x682.jpg\" alt=\"\" class=\"wp-image-5005\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic5-1-1024x682.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic5-1-300x200.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic5-1-768x512.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic5-1-1536x1023.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic5-1.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>A transistor that extracts a change in \u2018voltage\u2019 through a change in \u2018current\u2019.<\/p>\n\n\n\n<p>Characterized by easy gain, these transistors have a high amplification factor.<\/p>\n\n\n\n<p>It is also useful by its high noise characteristics and user friendly performance even under high frequencies.<\/p>\n\n\n\n<p>The name is derived from the Latin words bai, meaning \u2018two\u2019 + polar, meaning polarity, combining to form \u2018bipolar\u2019.<\/p>\n\n\n\n<p>As the name suggests, they are called bipolar transistors because they have two carrier waves, an electron and a hole.<\/p>\n\n\n\n<p>Bipolar transistors are also classified as \u2018NPN-type\u2019 and \u2018PNP-type\u2019.<\/p>\n\n\n\n<p>\u25cfMeaning of each pin.<\/p>\n\n\n\n<p>Bipolar transistors have three pins.<\/p>\n\n\n\n<p>\u30fbEmitter<\/p>\n\n\n\n<p>\u30fbBase<\/p>\n\n\n\n<p>\u30fbCollector<\/p>\n\n\n\n<p>These three types are often likened to<\/p>\n\n\n\n<p>\u30fbEmitter: piping<\/p>\n\n\n\n<p>\u30fbBase: water tap<\/p>\n\n\n\n<p>\u30fbCollector: tap<\/p>\n\n\n\n<p>The amount of water flowing from the tap is regulated by turning the tap.<\/p>\n\n\n\n<p>The same is done with transistors, where the current is controlled by the \u2018input signal to the base\u2019 and the \u2018amount of current flowing to the collector\u2019 is regulated, and so on.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Unipolar transistor<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic7-1024x682.jpg\" alt=\"\" class=\"wp-image-5006\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic7-1024x682.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic7-300x200.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic7-768x512.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic7-1536x1023.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic7.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>A transistor that extracts a change in \u2018current\u2019 by a change in \u2018voltage\u2019.<\/p>\n\n\n\n<p>They feature lower power consumption than bipolar transistors.<\/p>\n\n\n\n<p>The fast switching speed also makes the transistor suitable for compact and lightweight applications.<\/p>\n\n\n\n<p>The name here is derived from the Latin word uni, which means \u2018one\u2019.<\/p>\n\n\n\n<p>Unlike bipolar transistors, unipolar transistors handle only one type of transistor, either electrons or holes, hence the name.<\/p>\n\n\n\n<p>Unipolar transistors are also known as field-effect transistors, also known as \u2018FETs\u2019.<\/p>\n\n\n\n<p>\u25cfMeaning of each pin.<\/p>\n\n\n\n<p>The three pins of unipolar transistors have different references to those of bipolar transistors.<\/p>\n\n\n\n<p>\u30fbSource<\/p>\n\n\n\n<p>\u30fbGate<\/p>\n\n\n\n<p>\u30fbDrain<\/p>\n\n\n\n<p>There are also two types of unipolar transistors: \u2018MOS-type\u2019 and \u2018junction-type\u2019, each classified as P-type or N-type.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Photo transistor<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic6-2-1024x682.jpg\" alt=\"\" class=\"wp-image-5007\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic6-2-1024x682.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic6-2-300x200.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic6-2-768x512.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic6-2-1536x1023.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic6-2.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Transistor that controls the \u2018current\u2019 by means of an \u2018optical signal\u2019<\/p>\n\n\n\n<p>The name is a combination of photon and \u2018photon\u2019, light particle.<\/p>\n\n\n\n<p>As the name suggests, they are often used in products that receive optical signals, especially in \u2018infrared\u2019 receivers.<\/p>\n\n\n\n<p>For example, \u2018remote control receivers\u2019, \u2018optical communications\u2019, etc.<\/p>\n\n\n\n<p>Some automatic doors also use phototransistors.<\/p>\n\n\n\n<p>Transistors are also used in many other situations in society.<\/p>\n\n\n\n<p>Let&#8217;s look at them one by one.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How transistor is used in society<\/h2>\n\n\n\n<p>Transistors are used in surprisingly familiar places.<\/p>\n\n\n\n<p>Specifically, \u2018radios\u2019, \u2018electronic components\u2019 and \u2018parts of trains\u2019.<\/p>\n\n\n\n<p>Let&#8217;s explain them one by one.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Radio<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic4-2-1-1024x682.jpg\" alt=\"\" class=\"wp-image-5009\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic4-2-1-1024x682.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic4-2-1-300x200.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic4-2-1-768x512.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic4-2-1-1536x1023.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pic4-2-1.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Transistors play an important role in radio.<\/p>\n\n\n\n<p>Weak radio waves transmitted through the air are amplified and played at a level that people can hear through a loudspeaker.<\/p>\n\n\n\n<p>They&#8217;re used in radios because of their ability to \u2018amplify signals.\u2019<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Electronic components such as CPUs and memory<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict1-1024x682.jpg\" alt=\"\" class=\"wp-image-5010\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict1-1024x682.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict1-300x200.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict1-768x512.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict1-1536x1023.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict1.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Transistors are also used in many electronic components.<\/p>\n\n\n\n<p>Specifically, it is used when \u2018amplifying electrical signals\u2019 and as a \u2018switch\u2019, and is also useful when converting alternating current from semiconductor chips or power supplies into direct current.<\/p>\n\n\n\n<p>They are used not only in computers, but also in your smartphone.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Component of a train<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict2-1024x683.jpg\" alt=\"\" class=\"wp-image-5011\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict2-1024x683.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict2-300x200.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict2-768x512.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict2-1536x1024.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict2.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Since the mid-1990s, transistors have also been used in inverters for train vehicle drives.<\/p>\n\n\n\n<p>And more recently, they have been used in circuit systems for driving railway vehicles, combining silicon carbide (SiC) with field-effect transistors and other components.<\/p>\n\n\n\n<p>Although this is a very useful transistor, there are some precautions to be taken when using it.<\/p>\n\n\n\n<p>We will talk about this in the next section.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Points to note when using.<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict3-1024x682.jpg\" alt=\"\" class=\"wp-image-5012\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict3-1024x682.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict3-300x200.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict3-768x512.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict3-1536x1023.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict3.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Always check the specifications in the \u2018data sheet\u2019 before use.<\/p>\n\n\n\n<p>The part number is often written on the plastic part of the transistor.<\/p>\n\n\n\n<p>From that part number, you can find the \u2018data sheet\u2019 issued by the manufacturer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">History of transistor<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"685\" src=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict4-1024x685.jpg\" alt=\"\" class=\"wp-image-5013\" srcset=\"https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict4-1024x685.jpg 1024w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict4-300x201.jpg 300w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict4-768x514.jpg 768w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict4-1536x1027.jpg 1536w, https:\/\/agus.co.jp\/en\/wp-content\/uploads\/2026\/01\/pict4.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The transistor was invented in 1948 at the Bell Telephone Laboratories in the USA.<\/p>\n\n\n\n<p>Before the invention of the transistor, \u2018vacuum tubes\u2019 were mainly used in electronic equipment.<\/p>\n\n\n\n<p>Vacuum tubes are usually large, which was one of the reasons why products could not be made smaller.<\/p>\n\n\n\n<p>It was at this time that the \u2018transistor\u2019 was invented and many electronic devices were miniaturized.<\/p>\n\n\n\n<p>The three people involved in the invention were awarded the Nobel Prize in Physics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<p>In this article we explained about transistor<\/p>\n\n\n\n<p>The key points of this article are as follows.<\/p>\n\n\n\n<p>\u30fbTransistors are useful items with two functions: \u2018switching\u2019 and \u2018signal amplification\u2019.<\/p>\n\n\n\n<p>\u30fbTransistors are broadly divided into \u2018bipolar\u2019, \u2018unipolar\u2019 and \u2018photo\u2019.<\/p>\n\n\n\n<p>\u30fbIn society, they are used in \u2018radios\u2019, \u2018electronic components\u2019, \u2018parts of trains\u2019, etc.<\/p>\n\n\n\n<p>\u30fbTransistors have made many electronic products smaller.<\/p>\n\n\n\n<p>If you have any problems related to \u2018transistors\u2019, we may be able to help you. Please feel free to <a href=\"https:\/\/agus.co.jp\/en\/?page_id=95\">contact us.<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The \u2018transistor\u2019 is famous by name, but do you know what it is actually use[\u3082\u3063\u3068\u8aad\u307e\u305b\u3066\u301c]<\/p>\n","protected":false},"author":1,"featured_media":5003,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[44],"tags":[],"class_list":["post-5002","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-topics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is a transistor? This article explains types and what they are used for! | SUGA Co., Ltd.<\/title>\n<meta name=\"description\" content=\"The \u2018transistor\u2019 is famous by name, but do you know what it is actually used\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/agus.co.jp\/en\/?p=5002\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is a transistor? 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