HDD and other storage devices connectors pinouts
SCA=Single connector Attachment

Drive connector: AMP Champ 557613-1 or AMP Champ 557114-5
Cable connector: AMP Champ 2-557103-1 or AMP Champ 2-557101-1

SCSI-3 External Single-ended

Pin Name Dir Description
1 12V --- +12 VDC
2 12V --- +12 VDC
3 12V --- +12 VDC
4 12V --- +12 VDC
5 3.3V --- +3.3 VDC
6 3.3V --- +3.3 VDC
7 -DB(11) <-> Data Bus 11
8 -DB(10) <-> Data Bus 10
9 -DB(9) <-> Data Bus 9
10 -DB(8) <-> Data Bus 8
11 -I/O --> Input/Output
12 -REQ --> Request
13 -C/D --> Control/Data
14 -SEL <-> Select
15 -MSG --> Message
16 -RST <-> Reset
17 -ACK <-- Acknowledge
18 -BSY <-> Busy
19 -ATN <-- Attention
20 -P_CRCA ?  
21 -DB(7) <-> Data Bus 7
22 -DB(6) <-> Data Bus 6
23 -DB(5) <-> Data Bus 5
24 -DB(4) <-> Data Bus 4
25 -DB(3) <-> Data Bus 3
26 -DB(2) <-> Data Bus 2
27 -DB(1) <-> Data Bus 1
28 -DB(0) <-> Data Bus 0
29 -DB(P1) ?  
30 -DB(15) <-> Data Bus 15
31 -DB(14) <-> Data Bus 14
32 -DB(13) <-> Data Bus 13
33 -DB(12) <-> Data Bus 12
34 5V --- Ground (Signal)
35 5V --- Ground (Signal)
36 5V CHARGE --- Ground (Signal)
37 SPINDLE SYNC ? Spindle Sync
38 RMT_START ? Remote Start
39 SCSI ID (0) --- SCSI ID Bit 0
40 SCSI ID (2) --- SCSI ID Bit 2
41 12V GROUND --- +12 VDC Ground
42 12V GROUND --- +12 VDC Ground
43 12V GROUND --- +12 VDC Ground
44 MATED 1 ?  
45 3.3V CHARGE --- +3.3 VDC Charge
46 GROUND --- Ground
47 SIGNAL RETURN --- Ground (Signal)
48 SIGNAL RETURN --- Ground (Signal)
49 SIGNAL RETURN --- Ground (Signal)
50 SIGNAL RETURN --- Ground (Signal)
51 SIGNAL RETURN --- Ground (Signal)
52 SIGNAL RETURN --- Ground (Signal)
53 SIGNAL RETURN --- Ground (Signal)
54 SIGNAL RETURN --- Ground (Signal)
55 SIGNAL RETURN --- Ground (Signal)
56 SIGNAL RETURN --- Ground (Signal)
57 SIGNAL RETURN --- Ground (Signal)
58 SIGNAL RETURN --- Ground (Signal)
59 SIGNAL RETURN --- Ground (Signal)
60 SIGNAL RETURN --- Ground (Signal)
61 SIGNAL RETURN --- Ground (Signal)
62 SIGNAL RETURN --- Ground (Signal)
63 SIGNAL RETURN --- Ground (Signal)
64 SIGNAL RETURN --- Ground (Signal)
65 SIGNAL RETURN --- Ground (Signal)
66 SIGNAL RETURN --- Ground (Signal)
67 SIGNAL RETURN --- Ground (Signal)
68 SIGNAL RETURN --- Ground (Signal)
69 SIGNAL RETURN --- Ground (Signal)
70 SIGNAL RETURN --- Ground (Signal)
71 SIGNAL RETURN --- Ground (Signal)
72 SIGNAL RETURN --- Ground (Signal)
73 SIGNAL RETURN --- Ground (Signal)
74 MATED 2 ?  
75 5V GROUND --- +5 VDC Ground
76 5V GROUND --- +5 VDC Ground
77 ACTIVE LED OUT ?  
78 DLYD_START ?  
79 SCSI ID (1) --- SCSI ID Bit 1
80 SCSI ID (3) --- SCSI ID Bit 3

5: RESERVED/NC 6: RESERVED/NC 20: -DB(P0) 36: 5 VOLT 44: 12 V GROUND 45: RESERVED/NC 46: RESERVED/NC 74: 5 V GROUND

Note: Direction is Device relative Bus (other Devices)

SCSI-3 External Differential
 

Pin Name Dir Description
1 12V --- +12 VDC
2 12V --- +12 VDC
3 12V --- +12 VDC
4 12V --- +12 VDC
5 3.3V --- +3.3 VDC
6 3.3V --- +3.3 VDC
7 -DB(11) <-> Data Bus 11
8 -DB(10) <-> Data Bus 10
9 -DB(9) <-> Data Bus 9
10 -DB(8) <-> Data Bus 8
11 -I/O --> Input/Output
12 -REQ --> Request
13 -C/D --> Control/Data
14 -SEL <-> Select
15 -MSG --> Message
16 -RST <-> Reset
17 -ACK <-- Acknowledge
18 -BSY <-> Busy
19 -ATN <-- Attention
20 -P_CRCA ?  
21 -DB(7) <-> Data Bus 7
22 -DB(6) <-> Data Bus 6
23 -DB(5) <-> Data Bus 5
24 -DB(4) <-> Data Bus 4
25 -DB(3) <-> Data Bus 3
26 -DB(2) <-> Data Bus 2
27 -DB(1) <-> Data Bus 1
28 -DB(0) <-> Data Bus 0
29 -DB(P1) ?  
30 -DB(15) <-> Data Bus 15
31 -DB(14) <-> Data Bus 14
32 -DB(13) <-> Data Bus 13
33 -DB(12) <-> Data Bus 12
34 5V --- Ground (Signal)
35 5V --- Ground (Signal)
36 5V CHARGE --- Ground (Signal)
37 SPINDLE SYNC ? Spindle Sync
38 RMT_START ? Remote Start
39 SCSI ID (0) --- SCSI ID Bit 0
40 SCSI ID (2) --- SCSI ID Bit 2
41 12V GROUND --- +12 VDC Ground
42 12V GROUND --- +12 VDC Ground
43 12V GROUND --- +12 VDC Ground
44 MATED 1 ?  
45 3.3V CHARGE --- +3.3 VDC Charge
46 DIFFSNS --- Differential Sense
47 +DB(11) <-> Data Bus 11
48 +DB(10) <-> Data Bus 10
49 +DB(9) <-> Data Bus 9
50 +DB(8) <-> Data Bus 8
51 +I/O --> Input/Output
52 +REQ --> Request
53 +C/D --> Control/Data
54 +SEL <-> Select
55 +MSG --> Message
56 +RST <-> Reset
57 +ACK <-- Acknowledge
58 +BSY <-> Busy
59 +ATN <-- Attention
60 +P_CRCA ?  
61 +DB(7) <-> Data Bus 7
62 +DB(6) <-> Data Bus 6
63 +DB(5) <-> Data Bus 5
64 +DB(4) <-> Data Bus 4
65 +DB(3) <-> Data Bus 3
66 +DB(2) <-> Data Bus 2
67 +DB(1) <-> Data Bus 1
68 +DB(0) <-> Data Bus 0
69 +DB(P1) ?  
70 +DB(15) <-> Data Bus 15
71 +DB(14) <-> Data Bus 14
72 +DB(13) <-> Data Bus 13
73 +DB(12) <-> Data Bus 12
74 MATED 2 ?  
75 5V GROUND --- +5 VDC Ground
76 5V GROUND --- +5 VDC Ground
77 ACTIVE LED OUT ?  
78 DLYD_START ?  
79 SCSI ID (1) --- SCSI ID Bit 1
80 SCSI ID (3) --- SCSI ID Bit 3

5: RESERVED/NC 6: RESERVED/NC 20: -DB(P0) 36: 5 VOLT 44: 12 V GROUND 45: RESERVED/NC 46: RESERVED/NC 74: 5 V GROUND

Note: Direction is Device relative Bus (other Devices)

80 pin SCSI SCA-2 female connector layout
80 pin SCSI SCA-2 female connector
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Source(s) of this and additional information: SCA SFF-8015 Draft Rev 3.1, from Hardware Book
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