Fine pitch twisted pair ribbon cable...

U

Uwe Bonnes

Guest
Hello,

it seems, Hitachi stopped producing their Micro Quick-Twist 0.635 mm
pitch twisted pair ribbon cable. Samtec still offer such cables with
connectors. Any source for the pure cable?

Thanks

--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------
 
On 15 Nov 2022 12:46:28 GMT, Uwe Bonnes
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:

Hello,

it seems, Hitachi stopped producing their Micro Quick-Twist 0.635 mm
pitch twisted pair ribbon cable. Samtec still offer such cables with
connectors. Any source for the pure cable?

Thanks
Click to expand...

It\'s usually mfred with a defined distance between \'flattened\'
sections - required for automated termination.

The 0.635mm pitch? That\'s 0.025in in \'merkin.

I see your problem.

Hitachi stopped producing it? Says who?

RL
 
legg <legg@nospam.magma.ca> wrote:

Hitachi stopped producing it? Says who?

Collegues at another institute that try to order.
Click to expand...

Bye
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------
 
On 15 Nov 2022 12:46:28 GMT, Uwe Bonnes
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:

Hello,

it seems, Hitachi stopped producing their Micro Quick-Twist 0.635 mm
pitch twisted pair ribbon cable. Samtec still offer such cables with
connectors. Any source for the pure cable?

Thanks
Click to expand...

There are 21 types of (0.025) micro-twist cable.

I see discontinued notices for only 5 of these types.

Effective Date March 1, 2022

Product - Micro Quick Twist Series

TPO MQT 20051-068,

TPO DLMQT 20095-068, 20096-068,

?? 20293-068,

MQT 20050-068, 23195-068

The -68 may refer to the conductor count.

There are other varieties of the same TPO MQT, TPO DLMQT
and MQT cables in the catalog, not to mention conductor
counts, but I see that MQT products are no longer linked
in the general sales blurbs.

https://www.hca.hitachi-cable.com/products/hca/products/ribbon/mqt/pdfs/tpo-dual-laminated-mqt-cable.pdf

I wonder if single-sourcing is the issue - why it won\'t
sell . . .

RL
 
On 15 Nov 2022 12:46:28 GMT, Uwe Bonnes
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:

Hello,

it seems, Hitachi stopped producing their Micro Quick-Twist 0.635 mm
pitch twisted pair ribbon cable. Samtec still offer such cables with
connectors. Any source for the pure cable?

Thanks
Click to expand...

Do you really need twisted pair? For differential data, likely not.
 
John Larkin <jlarkin@highlandsnipmetechnology.com> wrote:

Do you really need twisted pair? For differential data, likely not.
Click to expand...

Yes, it is intended for differential data with LVDS level on many
neighbouring pairs. Electrical
coupling is probably not an issue with LVDS and the way the pairs are
twisted does not decrease electrical coupling substantial. But
magnetic coupling is nearly canceled out and I think has influence.

What is your reasoning that differential data does not profit from
twisted pairs?

Thanks
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------
 
On Tuesday, November 15, 2022 at 4:46:35 AM UTC-8, Uwe Bonnes wrote:
Hello,

it seems, Hitachi stopped producing their Micro Quick-Twist 0.635 mm
pitch twisted pair ribbon cable. Samtec still offer such cables with
connectors. Any source for the pure cable?
Click to expand...

How about 3M? Not sure about the fine pitch, though.

<https://www.3m.com/3M/en_US/p/c/electronics-components/interconnect-products/copper-wire-cable/flat-ribbon/twisted/>
 
On 15 Nov 2022 17:15:46 GMT, Uwe Bonnes
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:

John Larkin <jlarkin@highlandsnipmetechnology.com> wrote:

Do you really need twisted pair? For differential data, likely not.


Yes, it is intended for differential data with LVDS level on many
neighbouring pairs. Electrical
coupling is probably not an issue with LVDS and the way the pairs are
twisted does not decrease electrical coupling substantial. But
magnetic coupling is nearly canceled out and I think has influence.

What is your reasoning that differential data does not profit from
twisted pairs?

Thanks
Click to expand...

Just that the coupling between flat pairs may not trash the data
enough to matter. It might be easy to try.

I generally use flat cable with a ground (or an AC ground, like a
power supply) between pairs. That\'s more prudence than known
necessity. It might have less crosstalk than between adjacent twisted
pairs.
 
On Tue, 15 Nov 2022 12:05:46 -0800 (PST), whit3rd <whit3rd@gmail.com>
wrote:

On Tuesday, November 15, 2022 at 4:46:35 AM UTC-8, Uwe Bonnes wrote:
Hello,

it seems, Hitachi stopped producing their Micro Quick-Twist 0.635 mm
pitch twisted pair ribbon cable. Samtec still offer such cables with
connectors. Any source for the pure cable?

How about 3M? Not sure about the fine pitch, though.

https://www.3m.com/3M/en_US/p/c/electronics-components/interconnect-products/copper-wire-cable/flat-ribbon/twisted/
Click to expand...

Not twisted.

RL
 
We have the Hitachi 20096-068 cable you\'ve mentioned IN STOCK.
Chris Schwartz
CS Electronics
https://cs-electronics.com/68-pin-internal-scsi-cables/

--
For full context, visit https://www.electrondepot.com/electrodesign/fine-pitch-twisted-pair-ribbon-cable-3361956-.htm
 
We have the Hitachi 20096-068 cable you\'ve mentioned IN STOCK.
Chris Schwartz
CS Electronics
https://cs-electronics.com/68-pin-internal-scsi-cables/

--
For full context, visit https://www.electrondepot.com/electrodesign/fine-pitch-twisted-pair-ribbon-cable-3361956-.htm
 
We have the Hitachi 20096-068 cable you\'ve mentioned IN STOCK.
Chris Schwartz
CS Electronics
https://cs-electronics.com/68-pin-internal-scsi-cables/

--
For full context, visit https://www.electrondepot.com/electrodesign/fine-pitch-twisted-pair-ribbon-cable-3361956-.htm
 
We have this cable in stock.
Chris Schwartz
https://cs-electronics.com/68-pin-internal-scsi-cables/

--
For full context, visit https://www.electrondepot.com/electrodesign/fine-pitch-twisted-pair-ribbon-cable-3361956-.htm
 
On Tue, 15 Nov 2022 12:05:46 -0800 (PST), whit3rd <whit3rd@gmail.com>
wrote:

On Tuesday, November 15, 2022 at 4:46:35 AM UTC-8, Uwe Bonnes wrote:
Hello,

it seems, Hitachi stopped producing their Micro Quick-Twist 0.635 mm
pitch twisted pair ribbon cable. Samtec still offer such cables with
connectors. Any source for the pure cable?

How about 3M? Not sure about the fine pitch, though.

https://www.3m.com/3M/en_US/p/c/electronics-components/interconnect-products/copper-wire-cable/flat-ribbon/twisted/
Click to expand...

It looks like that cable has pairs with identical twist pitch but
alternating twist sign. Unshielded ethernet cables usually have
different pitches in the pairs to minimize crosstalk, at the price of
different prop delay per pair.

The choice to go to twist vs flat cable depends heavily on cable
length and data speeds. Flat is a lot cheaper and easier; just order
your jumpers from Mouser.
 
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