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44 pin IDC (0.75") male connector layout
44 pin IDC (0.75") male connector
at the controller & peripherals
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
29 /DMACK ? DMA Acknowledge
30 GND --- Ground
31 INTRQ <-- Interrupt Request
32 /IOCS16 ? IO ChipSelect 16
33 DA1 --> Address 1
34 PDIAG ? Passed Diagnostics. Used for 80-pin cable detect.
35 DA0 --> Address 0
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 closes 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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Pinouts.ru > HDD connectors pinouts > 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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