--- title: In Praise Of A Legendary Power Transistor | daily.dev description: The 2N3055 NPN power transistor has been used in an enormous range of devices for over six decades. Launched in the early 1960s with hometaxial construction,... canonical: https://daily.dev/posts/in-praise-of-a-legendary-power-transistor-v0za6jawg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: In Praise Of A Legendary Power Transistor | daily.dev og:description: The 2N3055 NPN power transistor has been used in an enormous range of devices for over six decades. Launched in the early 1960s with hometaxial construction,... og:url: https://daily.dev/posts/in-praise-of-a-legendary-power-transistor-v0za6jawg og:image: https://api.daily.dev/og/posts/V0za6JaWg.png og:image:alt: In Praise Of A Legendary Power Transistor og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # In Praise Of A Legendary Power Transistor **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary The 2N3055 NPN power transistor has been used in an enormous range of devices for over six decades. Launched in the early 1960s with hometaxial construction, it was replaced in the mid 1970s by an epitaxial version with the same capabilities. That switch raised the transistor's Ft, which required circuit modifications to prevent unwanted oscillation. The TO3-cased part now feels antiquated but still shows up in audio amplifiers and bench power supplies, and it likely won't disappear entirely. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What's the difference between the hometaxial and epitaxial versions of the 2N3055 transistor? The original 2N3055, launched in the early 1960s, used hometaxial construction. In the mid-1970s it was replaced by an epitaxial version with the same capabilities but a higher Ft (transition frequency). That higher Ft required modifications to circuits using the device to prevent unwanted oscillation. _daily.dev surfaces deep dives like this for engineers tracing how classic components evolved._ ### Why is the 2N3055 transistor considered such a legendary or iconic component? The 2N3055 is an NPN power transistor that has been used in an astounding array of devices for over six decades since its launch in the early 1960s. It is often ranked alongside other immortal electronic devices like the 555 timer and 741 op-amp for its ubiquity, and it still appears in audio amplifiers and bench power supplies today despite its now-antiquated TO3 case. _Electronics hobbyists revisiting classic parts like this find similar deep dives on daily.dev._ ## Similar posts on daily.dev - [TV Audio Tube Makes A Transceiver](https://daily.dev/posts/tv-audio-tube-makes-a-transceiver-s9p1jh2lq) · Hackaday · 0 upvotes · 0 comments - [Cursed circuits \#6: reverse avalanche oscillator](https://daily.dev/posts/cursed-circuits-6-reverse-avalanche-oscillator-hc2vdmwvm) · Hacker News · 0 upvotes · 0 comments - [Quantum-Tunnelling Field-Effect Transistor Designed to Overcome Integrated-Circuit Chip Development Barriers](https://daily.dev/posts/quantum-tunnelling-field-effect-transistor-designed-to-overcome-integrated-circuit-chip-development--1sphzuoo9) · The Quantum Insider · 0 upvotes · 0 comments - [The Shockley 4-Layer Diode In 2026](https://daily.dev/posts/the-shockley-4-layer-diode-in-2026-0ttebplzr) · Hackaday · 0 upvotes · 0 comments - [Diamond Transistor](https://daily.dev/posts/diamond-transistor-uadbusg9p) · Hacker News · 0 upvotes · 0 comments --- Tags: [#hardware](https://daily.dev/tags/hardware) [View this post on daily.dev](https://daily.dev/posts/in-praise-of-a-legendary-power-transistor-v0za6jawg) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"In Praise Of A Legendary Power Transistor","url":"https://daily.dev/posts/in-praise-of-a-legendary-power-transistor-v0za6jawg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/in-praise-of-a-legendary-power-transistor-v0za6jawg"},"datePublished":"2026-10-27T02:19:31.727Z","dateModified":"2026-10-27T02:19:58.728Z","description":"The 2N3055 NPN power transistor has been used in an enormous range of devices for over six decades. 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In the mid-1970s it was replaced by an epitaxial version with the same capabilities but a higher Ft (transition frequency). That higher Ft required modifications to circuits using the device to prevent unwanted oscillation. daily.dev surfaces deep dives like this for engineers tracing how classic components evolved."}},{"@type":"Question","name":"Why is the 2N3055 transistor considered such a legendary or iconic component?","acceptedAnswer":{"@type":"Answer","text":"The 2N3055 is an NPN power transistor that has been used in an astounding array of devices for over six decades since its launch in the early 1960s. It is often ranked alongside other immortal electronic devices like the 555 timer and 741 op-amp for its ubiquity, and it still appears in audio amplifiers and bench power supplies today despite its now-antiquated TO3 case. Electronics hobbyists revisiting classic parts like this find similar deep dives on daily.dev."}}]} ```