computer science

Lightning (connector)

Lightning (connector) is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lightning (connector) rather than just read about it. In short: Lightning is a discontinued proprietary computer bus and power connector, created and designed by Apple Inc. It was introduced on September 12, 2012, in conjunction with the iPhone 5, to replace its predecessor, the 30-pin dock connector, and discontinued in 2025, with the discontinuation of the iPhone SE.

Key takeaways

Lightning (connector) belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lightning (connector) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lightning (connector) from memory before moving on to harder problems.

Reference excerpt

Lightning is a discontinued proprietary computer bus and power connector, created and designed by Apple Inc. It was introduced on September 12, 2012, in conjunction with the iPhone 5, to replace its predecessor, the 30-pin dock connector, and discontinued in 2025, with the discontinuation of the iPhone SE. The Lightning connector is used to connect legacy Apple mobile devices like iPhones, iPads, and iPods to host computers, external monitors, cameras, USB battery chargers, and other peripherals. Using 8 pins instead of 30, Lightning is much smaller than its predecessor. The Lightning connector is reversible. The plug is indented on each side to match up with corresponding points inside the receptacle to retain the connection.

In 2018, Apple began transitioning to USB-C on iPad Pros and accessories. In response to European Union legislation to standardize charging ports passed in 2022, Apple said it would comply with regulations. The iPhone 15 and 15 Plus and the iPhone 15 Pro and Pro Max, announced on September 12, 2023, became the first iPhones to use USB-C, and the last few Lightning accessories made the transition in 2024 and 2025.

History The Lightning connector was introduced on September 12, 2012, with the iPhone 5, as a replacement for the 30-pin dock connector. The iPod Touch (5th generation), iPod Nano (7th generation), iPad (4th generation) and iPad Mini (1st generation) followed in October and November 2012 as the first devices with Lightning. On November 25, 2015, Apple acquired the "Lightning" trademark in Europe from Harley-Davidson. Apple was given a partial transfer of the Lightning trademark, suggesting that Harley-Davidson likely retained the rights to use the name for motorcycle-related products. The first-generation iPad Pro (12.9-inch models only) and the second-generation iPad Pro were the only devices in which the Lightning connector supported USB 3.0 host. The only accessory released with USB 3.0 support was the Lightning to USB 3 Camera Adapter.

Transition to USB-C In October 2018, following the implementation of USB-C across the Mac lineup, Apple released a range of iPad Pro models that replaced Lightning with it; the 2020 iPad Air (4th generation), 2021 iPad Mini (6th generation), and 2022 iPad (10th generation) similarly replaced Lightning with USB-C. In October 2022, Apple released the Siri Remote for the 3rd generation Apple TV 4K with a USB-C connector, becoming Apple's first accessory to charge via USB-C. In January 2020, the European Commission proposed laws to standardize charger ports. On October 4, 2022, the European Parliament approved regulations that require all electronic devices to support USB-C, in order to meet pressure by EU consumers regarding financial costs and electronic waste. Commentators said that these regulations would impact Apple most heavily. Apple stated concerns that this will "harm consumers in Europe and around the world", but on October 25, 2022, Greg Joswiak, vice president of global marketing for Apple, said that Apple will comply with the new EU regulations, indirectly confirming that iPhone models and other devices, if not portless, would ultimately replace Lightning with USB-C in the future. Released on September 22, 2023, the iPhone 15 series included the first iPhone models to use USB-C. This meant all iPad models released from March 18, 2022 and iPhone models released from September 22, 2023 use USB-C. The 2nd generation AirPods Pro were updated to a USB-C charging case, and the MagSafe Duo Charger and MagSafe Battery Pack, which used the Lightning connector, were discontinued. Apple subsequently transitioned its AirPods (on 9 September 2024) and Magic Mouse, Magic Trackpad and Magic Keyboard (all on October 28, 2024) to USB-C. Apple's last accessory using Lightning were the AirPods Max, which were revised in September 2024 to use USB-C. On February 19, 2025, following the discontinuation of the iPhone 14, iPhone 14 Plus, and iPhone SE (3rd generation), all iPhone models sold use USB-C.

Technology

Lightning is an eight-pin digital connector. Unlike the 30-pin dock connector it replaced (and USB Type-A and Type-B connectors), it is reversible. Most Lightning devices only support USB 2.0, which has a maximum transfer speed of 480 Mbit/s, or 60 MB/s. With USB 2.0, only one lane is in use at a time. Only the 12.9-inch iPad Pro (1st and 2nd generation) and 10.5-inch iPad Pro support USB 5Gbps (USB 3.2 Gen 1 operation mode), which has a maximum transfer speed of 5 Gbit/s, or 625 MB/s. This requires the Lightning to USB 3 Camera Adapter, which allows the iPad to connect with cameras and storage peripherals, but not computers.

Apple offers various adapters that allow the Lightning connector to be used with other interfaces, such as 30-pin, USB-C, HDMI, VGA, and SD cards. The Lightning to 30-pin adapter supports only a limited subset of the available 30-pin signals: USB data, USB charging, and analog audio output (via the DAC inside of the adapter). Lightning connectors contain an authentication chip that makes it difficult for third-party manufacturers to produce compatible accessories without being approved by Apple. The authentication scheme has been cracked by some third parties. The connector is 6.7 mm by 1.5 mm.

Versions C48 – gold plated connector pins, produced before March 2019, used in USB-A to Lightning cable C89 – rhodium-ruthenium plated (silver coloured) connector pins, more durable than C48 due to big IC, used in USB-A to Lightning cable C91 – 18 watt USB PD, used in Apple USB-C to Lightning cable, Apple later switched to using C94, same appearance and cost as C94 C94 – 18 watt USB PD, used in third party MFi USB-C to Lightning cable, same appearance and cost as C91 C100 – used in Earpods with Lightning Connector, same appearance as C101, lower price than C101 C101 – used in Lightning to 3.5 mm headphone jack adapter, same appearance as C100, higher price than C100

Compatible devices

iPhone iPhone 5 iPhone 5C iPhone 5S iPhone 6/6 Plus iPhone 6S/6S Plus iPhone SE (1st generation) iPhone 7/7 Plus iPhone 8/8 Plus iPhone X iPhone XS/XS Max iPhone XR iPhone 11 iPhone 11 Pro/11 Pro Max iPhone SE (2nd generation) iPhone 12/12 mini iPhone 13/13 mini iPhone 13 Pro/13 Pro Max iPhone SE (3rd generation) iPhone 14/14 Plus iPhone 12 Pro/12 Pro Max iPhone 13 Pro/13 Pro Max iPhone 14 Pro/14 Pro Max

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Lightning (connector)

Start with the simplest possible case. Write down what Lightning (connector) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lightning (connector) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lightning (connector) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lightning (connector)

In research: Lightning (connector) appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lightning (connector) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lightning (connector) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Apple Inc. hardware, Computer-related introductions in 2015, Computer buses, so understanding it makes those chapters shorter.
In everyday life: Look for Lightning (connector) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lightning (connector) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lightning (connector) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lightning (connector) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lightning (connector) in simple terms?

Why does Lightning (connector) matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lightning (connector)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lightning (connector).