MagSafe
Type | Computer power connector | ||
---|---|---|---|
Production history | |||
Manufacturer | Apple Inc. | ||
Produced | 2006–present | ||
Superseded | Apple Power Connector (2006) | ||
General specifications | |||
Hot pluggable | Yes | ||
External | Yes | ||
Pins | 5 | ||
Pinout | |||
Male MagSafe 1 connector, front view | |||
Pin 1 | GND (0 V) | ||
Pin 2 | V+ (14.5 / 16.5 / 18.5 / 20 V DC) | ||
Pin 3 | Charge control pin | ||
Pin 4 | V+ (14.5 / 16.5 / 18.5 / 20 V DC) | ||
Pin 5 | GND (0 V) | ||
Gray area indicates magnetic connector shroud |
MagSafe is a series of
History
The basic concept of MagSafe is derived from the magnetic power connectors that are part of many deep fryers and Japanese countertop cooking appliances since the early 2000s in order to avoid spilling their dangerously hot contents.[2][3][4] MagSafe was introduced on January 10, 2006 in the first-generation MacBook Pro.[5] Apple was granted US Patent No. 7311526 for MagSafe ("Magnetic connector for electronic device", issued in 2007) as MagSafe was deemed to be a sufficient improvement due to the connector being symmetrical and reversible, and the fact that magnets within a connector are arranged in opposing polarities for improved coupling strength.
Apple phased out the original MagSafe and MagSafe 2 with the release of the
The MagSafe connector returned in 2021 as "MagSafe 3" with the introduction of updated 14-inch and 16-inch MacBook Pro models.[9]
Apple also uses the
Features
MagSafe
The first generation MagSafe (also referred to as MagSafe 1 after the introduction of MagSafe 2) has connector pins that are designed so the rectangular connector can be inserted in either orientation. Originally the connector was T-shaped, with the cable directed straight out; later it became L-shaped, with the cable directed along the side of the computer, but still capable of being inserted in either orientation, unless simultaneous use of neighboring ports such as
The MacBook and the 13-inch MacBook Pro use a 60 W MagSafe charger, whereas the 15- and 17-inch MacBook Pro use an 85 W version. The MacBook Air used a lower-powered 45 W version. According to Apple, an adapter with a higher wattage than that originally provided may be used without problems.[12]
Apple formerly offered a "MagSafe Airline Adapter" for use on airplanes with EmPower Classic outlets. The MagSafe Airline Adapter had a DC input (instead of AC like the original MagSafe chargers) and would power the computer, but would not charge the battery.[13]
MagSafe 2
MagSafe 2 was introduced on the
The resulting shape is incompatible with the older MagSafe connector; Apple released a MagSafe to MagSafe 2 adapter that was also bundled with the Thunderbolt Display, which used the original MagSafe connector.
MagSafe 3
On October 18, 2021, Apple announced the M1 Pro and M1 Max 14-inch and 16-inch MacBook Pro models with MagSafe 3.[15] MagSafe 3 is slimmer than its predecessor and connects to a power supply using a removable cable with a USB-C end. It supports up to 140 W power delivery on the 16-inch MacBook Pro with its bundled 140 W GaN power adapter which supports USB Power Delivery 3.1.[16]
In June 2022, Apple announced the M2 MacBook Air with MagSafe 3, and new braided-jacket cables available in three colorways matching the available MacBook Air case colors.[17]
Pinout
The MagSafe connector pins allow for the adapter to be inserted in either orientation. The first and second pins on each side of the central pin have continuity with their mirror pins.
- In the first-generation connector, the inner large pins are V+ (14.5 / 16.5 / 18.5 / 20 V DC). Measuring with no load will give 6.86 V DC for MagSafe and about 3 V DC for MagSafe 2; the full voltage is provided after a ~40 kilohm (kΩ) load is applied for one second.[18]
- The outer large pins are ground.
- The central pin is used for communication between the computer and the power adapter following the 1-Wire protocol. The computer makes use of this to retrieve information about the power adapter and to change the color of the LEDs on the power adapter's connector. The Apple MagSafe power adapter's 1-Wire communication chip is located inside the MagSafe connector itself; the cable does not carry the data line to the power adapter enclosure.[18]
- The maximum voltage supplied is as follows:
- 14.5 V DC for the 45 W units supplied with MacBook Air
- 16.5 V DC for the 60 W units supplied with MacBook and 13" MacBook Pro
- 18.5 V DC for the 85 W units supplied with 15" and 17" MacBook Pro
- 20 V DC for the 85 W units supplied with 15" MacBook Pro Retina
The rectangular metal shroud surrounding the pins acts as shielding for the electrical pins and a ferrous attractor for the magnet in the laptop.
Third-party products
Apple does not license the MagSafe connector to third parties, but manufacturers have devised a workaround: their MagSafe-compatible products use the actual connector from Apple's AC adapter, grafted onto their own products. Since this uses an actual Apple product, purchased legally, manufacturers believe that no licensing agreements are needed (a principle referred to as the first sale doctrine) and no patent was violated.[19] However, in 2010 Apple still sued one such manufacturer, Sanho Corporation for selling its very popular HyperMac battery extension products which Apple claimed violated their patents.[20] Sanho has since ceased to sell their connector cable for the HyperMac series of external batteries.[21]
References
- ^ "Apple Unveils New MacBook with Intel Core 2 Duo Processors" (press release). Apple Inc. 8 November 2006.
- ^ Vallese, Julie (4 July 2001). "'Break-Away' Cord Aims To Make Deep Fryers Safer". CNN. Retrieved 9 July 2012.
- ^ "Break Away Power Cords, Durez 152". www.dowell.com.hk. Retrieved 9 June 2019.
- ^ Prior art for Apple's Magsafe. Patents Stack Exchange
- ^ Bowe, Tucker (28 May 2020). "What Ever Happened to One of the MacBook's Best Features?". Gear Patrol. Retrieved 14 October 2020.
- ^ Fleishman, Glenn (12 March 2015). "Will your new MacBook crash to the ground without MagSafe? (Yes.)". Macworld. Retrieved 28 October 2016.
- ^ Kastrenakes, Jacob (27 October 2016). "Apple is killing off MagSafe, one of the MacBook's best features". The Verge. Retrieved 28 October 2016.
- ^ Tracy, Phillip (9 July 2019). "Apple Just Killed the MacBook Air with Good Keyboard and 12-inch MacBook". www.laptopmag.com. Retrieved 13 July 2019.
- ^ "Apple's latest MacBook Pros have MagSafe, SD card slots and camera notches". Engadget. Retrieved 18 October 2021.
- ^ Screen Rant: Does iPhone 13 Have MagSafe? Here's What You Should Know "The back of every iPhone 13 has a series of magnets that work with cases, chargers, etc. MagSafe-compatible accessories line up with these magnets"
- ^ "MacBook". Apple Inc.
- ^ "Intel-Based Apple Portables: Identifying the Right Power Adapter and Power Cord". Apple Inc. 7 July 2023.
- ^ "Apple MagSafe Airline Adapter". Apple Inc. Archived from the original on 14 May 2011.
- ^ "One of Apple's Best Ideas Ever — Made Worse", The New York Times, 30 July 2012, archived from the original on 1 June 2020
- ^ "Apple brings MagSafe 3 to the new MacBook Pro". The Verge. 18 October 2021. Retrieved 19 October 2021.
- ^ Porter, Jon (19 October 2021). "Apple's new 140 W charger can fast charge a lot more than just your MacBook Pro". The Verge. Retrieved 19 October 2021.
- ^ Faulkner, Cameron (6 June 2022). "Apple announces redesigned MacBook Air with M2 chip and MagSafe". The Verge. Retrieved 16 June 2022.
- ^ a b Shirriff, Ken. "Teardown and exploration of Apple's Magsafe connector". Retrieved 3 December 2013.
- ^ Frakes, Dan (15 June 2007). "A Third-Party MagSafe Solution?". Mobile Mac (blog of Macworld). Retrieved 9 July 2012.
- PDF format).
- ^ Cheng, Jacqui (18 October 2010). "HyperMac To Halt MagSafe Sales, Hopes To Appease Apple". Ars Technica. Retrieved 9 July 2012.
- ^ Cheng, Jacqui (8 November 2011). "Frayed MagSafe Power Connector? There's Now a Settlement for That". Ars Technica. Retrieved 9 July 2012.
- ^ "Class-Action Lawsuit Forces Apple To Replace Frayed MagSafe Power Cords". TechCrunch. 10 November 2011. Retrieved 7 July 2022.
- ^ Lowensohn, Josh. "Apple settles split cord MagSafe lawsuit". CNET. Retrieved 7 July 2022.
- ^ Cesa, Dante. "Apple reaches settlement in MagSafe class action suit, dodges fireball". Engadget. Retrieved 7 July 2022.
External links
- "The Power of Magnets". Ars Technica (review). MacBook Pro. 1 March 2006. Part of the Ars Technica review of the MacBook Pro is dedicated to the MagSafe connector.
- "Where Are the MagSafe Adapters for Cars and Airplanes?". ZDNet. 28 June 2006.
- "MagSafe" (patent). Apple Inc.