This Is A Mirror

Note: This page has been mirrored of - iPodLinux :: Dock Connector acquired on 29-Jan-2007 @ 14:17 EST. Due to regularly unavailability of the original page I am hosting a copy so it is always available whenever I need it.


The dock connector was introduced with the 3rd generation iPods. With the dock connector the iPod can be charged, connected to a PC via USB or Firewire, connected to a stereo via line-out or connected to a serial device and controlled via the Apple Accessory Protocol. The manufacturer of the dock connector is JAE. The manufacturer's information on the dock connector can be found here.

One of our forum members, ridax, has purchased a bulk amount of dock connectors to resell to hobbyists. If you are interested, see this thread. You can also order on-line here. Spark Fun Electronics also sells male dock connectors here. has picked up the dock connectors as well (but not always in stock and reported to not fit the iPod):

Dock Connector Pin Out

The female dock connector's pin numbering:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

The male dock connector's internal pin numbering:

1 3 5 7 9  11 13 15 17 19 21 23 25 27 29
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30


1  Ground (-) 1
2  Line Out - Common Ground (-) 1
3  Line Out - R (+)
4  Line Out - L (+)
5  Line In - R (+)
6  Line In - L (+)
8  Video Out - Composite Video (for ipod colour when slideshow activated) 6
9  S-Video Chrominance 7
10 S-Video Luminance 7
11 Serial GND
12 Serial TxD
13 Serial RxD
15 Ground (-) 2
16 USB GND (-) 2
18 3.3V Power (+) 8
19 Firewire Power 12 VDC (+) 3
20 Firewire Power 12 VDC (+) 3
21 Accessory Indicator 4
22 FireWire Data TPA (-)
23 USB Power 5 VDC (+) 9
24 FireWire Data TPA (+)
25 USB Data (-) 9
26 FireWire Data TPB (-)
27 USB Data (+) 9
28 FireWire Data TPB (+)
29 FireWire Ground (-) 5
30 FireWire Ground (-) 5
1  1,2 connected on motherboard
2  15,16 connected on motherboard
3  19,20 connected on motherboard
4  21 connected to ground via a resistor.  Different resistances indicate which accessory is connected.
         Known resistances/functions (Ohms) are as follows:
         1k0 - iPod docking station, iPod beeps when connected
         10k - Takes my iPod into photo import mode
         500k - vava uses this for his serial-via-dock experiments
                Used in Dension Ice Link Plus car interface
         1M0 - Belkin auto adaptor, iPod shuts down automatically when power disconnected
5  29,30 connected on motherboard
6  Composite out uses common ground as ground
7  Newly discovered from iPod Color Dock
8  18 stepped up to provide +5 VDC to USB on iPod Camera Connector.
   If iPod is put to sleep while Camera Connector is present, +5 VDC on USB slowly drains back to 0 VDC.
   If Camera Connector is disconnected, draining power can be detected between this pin
       on the Camera Connector dock connector and +5 VDC on USB connector.
9  25 and 27, D- and D+.
   Different kind of behaviour of the iPod if those pins are set to a certain state. To force
       the iPod (useful for the iPod 5G) to charge in any case, when 'USB Power 5 VDC' (pin 23)
       is fed, 25 must be connected to 3.3V (USB uses 3.3V for data communication, you can connect to 5V but its not as safe) through a 10kOhm resistor, and 27 must be connected to 
       the Ground (for example: pin 1) with a 10kOhm resistor. 10kOhm resistor has been determined

Dock Connector Specifications

The dock connector used on the iPod is a proprietary connector manufactured for Apple by JAE. To obtain the mating connectors for the iPod you must contact Apple, sign an NDA and the "Made for iPod" agreement, and probably jump through more hoops. I was told by a tech at JAE that the Apple part numbers are as listed below, but end with "2" instead of "1". See the photo below that shows how the Apple parts are "keyed" differently from the standard parts.

The following parts were ordered in March 2006:

JAE p/n DD1P030MA1
(Obtained from from
Cord mount "plug". Mates with DD1R030HA1. Does NOT mate with iPod 5G. This connector is different than the one pictured below. Photos will be posted shortly.

JAE p/n DD1B030HA1
(Obtained as a sample from JAE's U.S. sales Office in Irvine)
Horizontal PCB mount "plug". Mates with DD1R030HA1. Does NOT mate with iPod 5G.

JAE p/n DD1R030HA1
(Obtained as a sample from JAE's U.S. sales Office in Irvine)
Horizontal PCB mount "receptacle". This part is analogous to the dock connector within the iPod, but it is keyed differently. It mates with DD1P030MA1 and DD1B030HA1. Does NOT mate with iPod dock model A1153 or iPod USB cable.

JAE p/n DD1B030VA1
(Obtained as a sample from JAE's U.S. sales Office in Irvine)
This is the 75 degree angled connector as used on the Apple iPod Dock Model A1153. This is the only connector I was able to obtain that mated with the iPod connectors without any modification. It does not mate with the DD1R030HA1. This is odd. JAE may have sent me the Apple part by mistake.

It appears that the DD1P030MA1 and DD1B030HA1 can be modified to mate with the iPod. You would need a small grinder to remove a very small amount of metal and plastic on the one side that interferes with the "key" in the iPod's receptacle.

Contact resistance: 50 milliohms max
Rated for 0.5A signaling, 1.0A power (30 volts).
Mating cycle of 10,000 times.

For detailed specifications:

JAE Plug Pictures


Top Inside
Top Outside
Bottom Inside
Bottom Outside
Bottom Exploded
Assembled Top
Assembled Rear
Pin Detail

Receptacle Keys

New Plug Design (ordered March 2006)


Here is a new type of plug with shield. It is confirmed to work with all iPods with dock connector (available from

Pins visible

Here is a cradle connector slanted 15 degrees. It is confirmed to work with all iPods with dock connector (available from

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