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44 pin IDC (0.75") female connector layout
44 pin IDC (0.75") female connector
at the cable
This connector is mostly used for 2.5 IDE HDD of notebooks and so on. Pins 1-40 are the same as the IDE/ATA 40 pin connector, but the spacing between pins is smaller and they are therefore electronically, but not physically compatible.
Pin Name Dir Description
1 /RESET --> Reset
2 GND --- Ground
3 DD7 <-> Data 7
4 DD8 <-> Data 8
5 DD6 <-> Data 6
6 DD9 <-> Data 9
7 DD5 <-> Data 5
8 DD10 <-> Data 10
9 DD4 <-> Data 4
10 DD11 <-> Data 11
11 DD3 <-> Data 3
12 DD12 <-> Data 12
13 DD2 <-> Data 2
14 DD13 <-> Data 13
15 DD1 <-> Data 1
16 DD14 <-> Data 14
17 DD0 <-> Data 0
18 DD15 <-> Data 15
19 GND --- Ground
20 KEY - Key (Pin missing)
21 DMARQ <-- DMA Request
22 GND --- Ground
23 /DIOW --> Write Strobe
24 GND --- Ground
25 /DIOR --> Read Strobe
26 GND --- Ground
27 IORDY <-- I/O Ready
28 SPSYNC:CSEL ? Spindle Sync or Cable Select. Hasn't been used for spindle sync in probably decades now.  It is grounded at the host; if a drive sees this pin grounded and has its CS jumper installed, it is the master/device 0, if it sees the pin floating and has its CS jumper installed, it is the slave/device 1.
29 /DMACK --> DMA Acknowledge
30 GND --- Ground
31 INTRQ <-- Interrupt Request
32 /IOCS16 <-- IO ChipSelect 16. During a PIO operation it signifies the data transaction in process needs to be a 16 bit value.  In DMA operations, it is never asserted, even though they are all 16 bit.
33 DA1 --> Address 0
34 PDIAG ? Passed Diagnostics. Is grounded by the cable when an 80 pin cable is installed, or wired through to the drives with a 40 pin cable
35 DA0 -- Address 1
36 DA2 -- Address 2
37 /IDE_CS0 --> (1F0-1F7)
38 /IDE_CS1 --> (3F6-3F7)
39 /ACTIVE --> Led driver
40 GND   Ground
41 +5VL   +5 VDC (Logic)
42 +5VM   +5 VDC (Motor)
43 GND   Ground
44 /TYPE   Type (0=ATA)

 

Note: Direction is Controller relative Devices (harddisks).

Special Note: Pin 1 is closest to the 4-pin selector. Pin 20 may be missing, this is normal, and allows for cable polarity.  

On some motherboards, pin 1 is usually indicated by a Square or Triangle, either on the solder pad, above label, or silkscreen markings.

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There are 26 reports in our database: 18 positive and 7 negative.
PinoutsGuide.com > HDD connectors > Pinout of ATA (44) internal and layout of 44 pin IDC (0.75") male connector and 44 pin IDC (0.75") female connector
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