Mating Connectors; Mating Connectors For N Model Drives; Figure 24. Nonshielded 50-Pin Scsi Device Connector Used On N Drives - Seagate ST336737LW Product Manual

Barracuda 36ES Product Manual, Rev. H
cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered.
Proper impedance matching is especially important in order to maintain adequate margin at FAST-20 and
FAST-40 SCSI transfer rates.
Note. For LVD operation, twisted pair cables are recommended. For LVD Fast-40 operation, twisted pair
cables are strongly recommended. For Fast-80 operation, twisted pair cables are required .
ST336737LC and ST318437LC models:
The 80-pin connector option is intended for use on drives that plug directly into backplane connector in the host
equipment. In such installations, all backplane wiring segments are subject to the electromagnetic concepts
presented in Standard X3T10/1302D, section 6. For LC model drives, installations with connectors on cables
are not recommended.
9.6.4

Mating connectors

Part numbers for the different type connectors that mate with the various Barracuda 36ES I/O connectors are
given in the sections following.
9.6.4.1

Mating connectors for N model drives

N model drives require a nonshielded cable with a 50-conductor connector consisting of two rows or 25 female
contacts with adjacent contacts 100 mils apart.
Recommended mating flat cable connector part numbers are:
Closed end (for cable ends) [1]
Open end (In daisy-chain) [1]
The drive device connector is a nonshielded 50-conductor connector consisting of two rows of 25 male pins
with adjacent pins 100 mils apart. The connector is keyed (see Figure 24).
Mating panel mount connector: 3M-CHE-2050-J01A10-KLE.
1.45±0.05
12.80
14.86 (2X)
2.03±0.25 (3X)
1.27 (4X)
1.52
¯2.10±0.04
Trifurcated Pin
(4X)
8.50 6.60
5.08 (3X)
Figure 24. Nonshielded 50-pin SCSI device connector used on N drives
3M-3425-7000
3M-3425-7050
Dupont-66900-290
3M-3425-6000
3M-3425-6050
Dupont-66900-250
15.24
7.62 10.03
2.54
R 0.73
17.65
24.13
21.32
2.54 Typ.
A
1 2 3 4
A
C 1.65X45¡ Typ.
15.24 10.67
W/O strain Relief, No Center Key
With Strain Relief, No Center Key
With Strain Relief, With Center Key
W/O strain Relief, No Center Key
With Strain Relief, No Center Key
With Strain Relief, With Center Key
77.60
5.08
6.35
R 0.51 Typ.
0.50 Typ. 1.27 Typ.
62.23 Ref.
97.40
93.72 Ref.
68.58
60.96
0.64+0.05/Ð0.025
Sq. Contact
34.29
67
9.27
13.89
2.16
3.81
B
2.54 6.60
B
R 0.51 Typ.