[time-nuts] Power connectors continued

Sun Jun 25 22:53:43 UTC 2017

Working in motorsport, we used the Deutsch Autosport series. They're based
on military connectors but are lighter and possibly cheaper. Still far from
cheap, but high density, high reliability and MUCH easier to assemble than
Lemos. Usually crimped pins and raychem heatshrink cable entry.

https://www.prowireusa.com/c-6-deutsch-autosport.aspx

On Sun, Jun 25, 2017 at 1:12 AM, Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> If you have a phase noise under vibration requirement, you do *not* want
> to use
> the “D connector” setup. Go with an SMA ….
>
> Bob
>
> > On Jun 24, 2017, at 7:54 PM, Didier Juges <shalimr9 at gmail.com> wrote:
> >
> > I have been forced to use micro-D by a customer on a military power
> supply,
> > not even space rated, it was well over $100 each in 50 piece quantity (I
> > think it was a 25 pin).
> >
> > However, unless they are mistreated (which is easy for the reason you
> > listed), they seem reliable. I do not believe we have replaced one in
> over
> > 400 units shipped and a 15 year period (aside from a couple of prototypes
> > that went through hell). That must be one of our better customers...
> >
> > The design choice of protecting the pin instead of the socket is
> baffling.
> >
> >
> > On Jun 23, 2017 7:03 PM, "jimlux" <jimlux at earthlink.net> wrote:
> >
> > On 6/22/17 4:22 PM, William H. Fite wrote:
> >
> >> A good friend of mine, sadly of blessed memory, was a lead engineer for
> >> Grumman on the comm systems of the lunar lander. He spoke of small
> >> space-rated multi-pin connectors that cost upward of $500 each.
> >>
> >>
> >> The Micro-D is widely used in spaceflight, and is a pox on the connector
> > world - not only are they expensive, the way the pins and jacks are made
> is
> > almost asking for damage - the pin is shrouded in a hole, and the jack is
> > exposed. $100 for a 9 pin wouldn't surprise me.
> >
> > Lately, I've been encountering nano-D (Glenair, Omnetics) - they're not
> as
> > delicate, they're smaller.
> >
> >
> >
> >
> >
> >
> >> On Thursday, June 22, 2017, Arnold Tibus <arnold.tibus at gmx.de> wrote:
> >>
> >>
> >>> Hello,
> >>>
> >>> I can second Magnus and want to throw in some more details.
> >>> Cannon, Deutsch, Bendix, Souriau, Matrix, Amphenol,  etc. etc. are
> (big)
> >>> companies manufacturing all kind of connectors and are  n o t
> connector
> >>> type designations! Important are the type numbers of the manufacturer
> or
> >>> higher level specification numbers.
> >>> We used in the aircraft and spacecraft business naturally the military
> >>> (MS-) numbers listed in the MIL-QPL (or eg. for Spacelab with GSFC
> spec.
> >>> no). Most types of connectors are under these numbers available from
> >>> different manufacturers, of course with different manufacturer in house
> >>> part numbers. Attention: the 'same' connectors may be bought w/o the
> >>> Mil.-spec. sheets with somewhat lesser quality. Important details are
> >>> the max. mating number, the contact resistance (e.g. 20 mOhm) and the
> >>> max. continuous current, max. Voltage, vibration resistance and
> >>> reliability etc.  Of course, this makes good connectors somewhat
> >>> 'expensive'. Hirel and non-magnetic gold plated D- subminiture type
> >>> connectors do survive e.g. the rocket launch phase (high vibrations),
> >>> vacuum and low temperatures and are still used for space projects.
> >>>
> >>
> >
> > AMP (and others) sell a lower cost version called the "Circular Plastic
> > Connector" or CPC. A coarser screw thread than the round metal MS
> > connectors.
> >
> > The round connectors (called Bendix connectors by some at JPL, because,
> of
> > course, that was the mfr for some batch of them) have a nice mil-std to
> > define them.  There's a Shell, an Insert, and pins/jacks.  You can get
> > shells and inserts with different keys and "clocking" to prevent
> mismates.
> > There are coax and triax inserts, high voltage inserts, etc.
> >
> > While they're pricey brand new, there are numerous surplus suppliers
> (Apex
> > Electronics in Sun Valley, CA used to have thousands of them).
> >
> > You can get them hermetic, vacuum tight, waterproof, locking,
> non-locking,
> > every kind dielectric imaginable, etc.
> >
> >
> >
> >
> >
> >
> >
> >>> The D-sub series of connectors was introduced by Cannon in 1952. They
> >>> are still available as standard, hirel, and non-magnetic versions. The
> >>> contacts were machined contacts forcrimping or soldering connection and
> >>> made of massive copper with gold finish. (more see e.g.
> >>> https://en.wikipedia.org/wiki/D-subminiature). Example for the
> standard
> >>> 9 pin connector designation (crimp): DEMAM-9S and DEMAM-9P. Today are a
> >>> big number of companies producing equivalent types. Cheap ones are
> >>> equipped with contacts made of sheetmetal. Nobody should expect then
> the
> >>> same spec. values as reliability, mating numbers, contact power rating
> >>> etc.
> >>> It is up to the designer of a product to be informed and select the
> >>> right quality device for his product ...
> >>>
> >>
> >
> > My problem with D-sub is two fold:
> > 1) making a chassis hole is a pain - although now, with places like Front
> > Panel Express, it's less so.
> > 2) the shroud around the plug/male gender is easy to bend if it gets
> > stepped on.  Sure, for flight hardware, carefully handled under the
> > watchful eye of QA, not an issue, but I have lots of these from my
> > not-entirely-mis-spent youth that are bent.
> >
> > They do come with removable pins/jacks, and you can get coax flavors too.
> > They're fairly compact in a panel.
> >
> >
> > Other connectors of interest are those made by Lemo and Hirose.  Lemo are
> > locking, pretty rugged when mated, and small for the number of
> conductors.
> > You see them on high end video and medical gear.
> >
> > There's also something about double banana plugs and mating jacks. I go
> > back and forth between PP and banana plugs for preference.
> >
> > BTW, there are panel mounts for PP.
> >
> >
> >
> >
> >
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