Hardware: MagSafe

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MagSafe
The MagSafe power adapter on a MacBook.
Type
Computer power connector
Production history
Manufacturer
Apple Inc.
Produced
2006
Superseded
Apple Power Connector
Specifications
Hot pluggable
Yes
External
Yes
Pins
5
Pin out
Male connector, front view
Pin 1
Ground
Pin 2
V+ @ 16.5 VDC
Pin 3
Charge control pin
Pin 4
V+ @ 16.5 VDC
Pin 5
Ground
Grey area indicates magnetic connector
The MagSafe connector is a power connector introduced in conjunction with the MacBook Pro at the Macworld Expo in San Francisco on January 10, 2006. The MagSafe connector is held in place magnetically. As a result, if it is tugged on姊杘r instance, by someone tripping over the cord姊歵 comes out of the socket safely, without damaging it or the computer or pulling the computer off its table or desk[1]. MagSafe is similar to the magnetic power connectors that many deep fryers and Japanese countertop cooking appliances have in order to avoid spilling their dangerously hot contents.[2]
Contents
1 Features
2 Pinout
3 Criticisms and defects
4 References
5 External links
//
Features

Boxed 85W MagSafe for MacBook Pro.
The MagSafe connector pins are designed so that the rectangular connector can be inserted in either orientation. LEDs on both sides show green if the computer batteries are fully charged and amber if they are charging. MagSafe can be found on MacBook Pro, MacBook and MacBook Air notebook computers[3].
Though the 60 W MacBook and 85 W MacBook Pro MagSafe connectors are identical, Apple recommends using only the adapter provided with the machine. The MacBook Air has a smaller 45 W version of the MagSafe adapter.
Apple's MagSafe Airline Adapter is available for DC hookups on certain airplanes.
Apple owns US patent 7,311,526, "Magnetic connector for electronic device", for this technology.
Pinout
The MagSafe connector pins are palindromic. The first and second pin on each side of the tiny central pin has continuity with its mirror pin.
The inner large pin is V+ @ 16.5 VDC. Measuring with no load will give 6.86 VDC; the full 16.5 V is provided to the proper load.
The outer large pin is ground
The tiny center pin appears to be charge control pin to change LED color and possibly adapter switch off
The rectangular metal shroud has no electrical function. Its purpose is solely for shielding the electrical pins and acting as a ferrous attractor for the magnets within the laptop's power receptacle.
Criticisms and defects
Apple has not licensed third-party products using MagSafe, however manufacturers have devised a workaround: their MagSafe items use the actual connector from Apple鎶� AC adapter, grafted onto their own product. Since this uses an actual Apple product, purchased legally, no licensing agreements are violated.[4]
Some users keep reporting (as of April 16 2008) problems with the quality of the construction of the MagSafe cords, giving the product low marks on the Apple Store鎶� website[5]. Common complaints include plug separating from the cord (fraying), transformer shorting, and pin springs losing elasticity.[6]
References
^ Apple Unveils New MacBook With Intel Core 2 Duo Processors
^ CNN.com - 'Break-away' cord aims to make deep fryers safer - July 4, 2001
^ Apple - MacBook
^ Macworld | Mobile Mac | A third-party MagSafe solution?
^ The Apple Store (U.S.)
^ ibid.
External links
Wikimedia Commons has media related to: MagSafe
MacBook Pro Design, featuring the MagSafe connector
The power of magnets, part of the Ars Technica review of the MacBook Pro dedicated to the MagSafe connector
Where are the MagSafe adapters for cars and airplanes?
MagSafe Counter Notebook saved by MagSafe counter
MagSafe Patent Apple's MagSafe patent
Categories: DC power connectors | Apple Inc. hardware(and so on)