scsi connector types and pictures

 SCSI Connectors and SCSI Cable information

SCSI Terms, SCSI specifications - SCSI cable length specs

The Connectors:

IDC50

50 Pin Header

50 Pin Header

IDC50 Female

idc50 male connector

IDC50 Male

IDC 50 pin female, mates to IDC50 male "header", used on SCSI-1, SCSI-2, Ultra SCSI "narrow" etc. All internal 50-conductor "8-bit" SCSI uses these cconnectors.


CN50

Centronics 50

CN50 Male

cn50 female scsi connector

CN50 Female

Centronics C50 sometimes referred to as CN50, Cent50 (External connector on many SCSI-1 and some SCSI-2 Controllers) The controller connector and peripherals connectors should be females, and the cables male.


DB25

DB25 male scsi connector

DB25 Male

SCSI-1

Used with the older Macs, Zip drives, and many scanners.

db25 female scsi connector

DB25 Female


HD50

hd50 male scsi connector

HD50 Male
(Mini D50 HPDB50 SCSI-2/SCSI-3 external connector) . The easy way to tell the difference between an HD50 and an HD68 (unless you want to count those tiny little pins) is to measure them. HPDB50 is about 1 3/8” (36mm) , and the HPDB68 is about 1 7/8” (47mm)

hd50 female scsi connector

HD50 Female


HD68

hd68 male scsi connector

HD68 Male

(MiniD68 HPDB68 Ultra wide SCSI-3/ Ultra2 LVD SCSI/ wide Differential SCSI both internal and external) The internal and external connectors appear to be different, but they are the same basic connector. The easy way to tell the difference between an HD50 and an HD68 (unless you want to count those tiny little pins) is to measure them. HD50 is about 1 3/8” (36mm) , and the HD68 is about 1 7/8” (47mm).

hd68 female scsi connector

HD68 Female

VHDCI

vhdci male scsi connector

VHDCI male

VHDCI 0.8mm HPCN68 male- Sometimes called SCSI-5. Very popular in RAID cards.


VHDCI female scsi connector

VHDCI female


HDI-30



HDI-30 scsi connector

HDI-30 is for Apple Macintosh PowerBooks.


HPCN50

Used in Japan, on several Digital cameras and things.



HPCN50-M

HPCN50 pin (rare)

DB50



DB50 Male

SCSI-1

Usually used on old Sun Sparcstations.

db50_female

DB50 Female


DB37

db37

Male DB37

SCSI-1

db37_female

Female DB37


HDCN60

Mini Centronics 60

(Mini Centronics 60 HDCN60 - old IBM RS6000)

We don't carry these cables anymore



The SCSI Types Bus lengths, devices supported, etc.

Much more info on SCSI Cable lengths and "gotchas" below the chart
STA (SCSI Trade Association) -Endorsed Terms & Terminology for SCSI Parallel Interface Technology.

see here for term descriptions

STA
Terms

(notes-see below)

Bus Speed, MBytes/Sec.
Max.
Bus Width, bits  
Max.
Bus Lengths, Meters (1)
Max. Device Support
Single-
ended
LVD HVD
SCSI-1(2) 5 8 6 (3) 25 8
Fast
SCSI (2)
10 8 3 (3) 25 8
Fast
Wide SCSI
20 16 3 (3) 25 16
Ultra
SCSI (2)
20 8 1.5 (3) 25 8
Ultra
SCSI (2)
20 8 3 - - 4
Wide
Ultra SCSI
40 16 - (3) 25 16
Wide
Ultra SCSI
40 16 1.5 - - 8
Wide
Ultra SCSI
40 16 3 - - 4
Ultra2
SCSI (2,4)
40 8 (4) 12 25 8
Wide
Ultra2 SCSI (4)
80 16 (4) 12 25 16
Ultra3
SCSI or Ultra160 SCSI (6)
160 16 (4) 12 (5) 16
Ultra320 SCSI (6) 320 16 (4) 12 (


Notes:


  1. The listed maximum bus lengths may be exceeded in Point-to-Point and engineered applications.

  2. Use of the word "Narrow", preceding SCSI, Ultra SCSI, or Ultra2 SCSI is optional.

  3. LVD was not defined in the original SCSI standards for this speed. If all devices on the bus support LVD, then 12-meters operation is possible at this speed. However, if any device on the bus is singled-ended only, then the entire bus switches to single-ended mode and the distances in the single-ended column apply.

  4. Single-ended is not defined for speeds beyond Ultra.

  5. HVD (Differential) is not defined for speeds beyond Ultra2.

  6. After Ultra2 all new speeds are wide only.



The Cable Length Rules*


(In case you're not confused yet)

A short simplified guide to scsi cable lengths.

Type
of SCSI

"Single-ended"
(Regular) SCSI bus length

"Differential"
SCSI bus length

LVD
SCSI  bus length
††

(ULTRA2 OR ULTRA160)

5
MHz (SCSI-1)

 6
meters

25
meters

-

10
MHz (SCSI-2 FAST, Fast / Wide SCSI)

3
meters

25
meters

-

20
MHz (Ultra SCSI,  Ultra Wide SCSI or  "Fast20")

3
meters (3 devices + host adapter) or 1.5 meters (4 devices + host adapter)*

25
meters

-

40
MHz (Ultra2,Ultra160, U320 SCSI or  "Fast40")

-

-

12
meters

*please  note: "Ultra" SCSI cable lengths
are severely limited! The maximum cable
length is ten feet when four devices (including the host adapter) or less are on the bus. If five devices are used (four
devices and your host adapter), then the maximum bus length is 1.5 meters
(five feet!). Knocking
Ultra2 or U160 chains out of LVD mode by putting "Legacy" Single
Ended (regular Ultra scsi, etc) devices on the chain
will give you the same cable length restrictions as Ultra scsi. Watch
it!!

SCSI Information:

SCSI connector pictures

The basics of SCSI for newbies and technical information

SCSI connection FAQ

SCSI cable Length guide