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Old Aug 23, 2011, 04:05 AM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
6,326 Posts
Careful!
"JST" connector confusion - the real story

With the growth of more mainstream micro gear the confusion around the common "JST" connectors has grown. Leaving aside the proprietary systems from Micro Invent etc I thought it might be helpful to gather in one place the info about the most common types. One of them is not even a JST connector but is made by Molex. Hobby King and others however refer to anything small and white as a "JST" connector.

This is just stuff I am familiar with. Feel free to correct any errors or add any other manufacturers/items that use the common 3 small ones to add to the information base. There is limited possibility to move the pins from one system into the shell of another (generally bigger) one, sometimes by trimming very slightly the retaining nylon tabs. This is a lot easier than changing the connectors over for most people but you need to try it and see. Crimping the connectors is not easy but possible. There are no crimping tools for ordinary folks at a reasonable price for these sizes that I am aware of and very high quality needle nose pliers are the best option. And a magnifier and steady hand. Soldering also works but will cause the wire to break easily if it is not also crimped at the strain relief.

There are a few specialist vendors that supply these small leads and/or a change over service. RC-Connectors, and Hansen Hobbies in the US and Micron in the UK are all people I can personally recommend for the servo connectors. There may be others just as good.

http://www.rc-connectors.com/
http://www.hansenhobbies.com/
http://www.micronradiocontrol.co.uk/



JST-XH is 2.5mm pin spacing (same as 0.1inch for all practical purposes)
Not micro size but very common. Used in most balance plugs on LiPos and is the "standard" header spacing in many electronic components including PCs. The standard Futaba/JR style servo plugs are this spacing.

JST- ZH is 1.5mm pin spacing
Used in the Spektrum AR 6300 system and a compatible DSM2 Rx from DelTang (DelTangs are available with all 3 connectors).

Molex PicoBlade is 1.25mm pin spacing.
Used in Futaba, FlyDream, Walkera and the new Hobby King Micro (DSM2) 2.4G systems. The HobbyKing 1.7 and 2.2g Servos have this connector. The 2 pin version is used on the PZ bricks as a battery connector.

JST-SH is 1.0mm pin spacing.
Used for servo connection in Spektrum AR6400 "Brick" and the HobbyKing SuperMicro (not DSM2) systems. Most linear servos have this connector.

You should always check the wiring polarity is also correct. Vendors have had a habit of producing connectors with the wiring swapped around.

The attached picture of the 3 micro connectors and also the common JST balance plug shows the sizes and what they look like front and back. Gene has done a similar one in post 6 which adds the usage info.

I have also attached spec sheets for the connectors which have all the physical measurements. Note that one data sheet covers all the connectors of the same family no matter how many pins they have.

Hope this is useful.

John
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Last edited by jj604; Sep 23, 2011 at 12:29 AM. Reason: Typo on picture corrected JST-SX -> JST-SH
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Old Aug 23, 2011, 05:20 AM
Mack
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Australia, VIC, Mentone
Joined Jun 2004
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A terrific summary John. Thanks for unravelling the mysteries of connectors. The makers know not what they do to us! Hope to see you at Sandy next Monday.
Peter
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Old Aug 23, 2011, 05:24 AM
ancora imparo
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Melbourne, Australia
Joined Jul 2005
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Peter, should be there. The Vapor is repaired.
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Originally Posted by Peter Mack View Post
A terrific summary John. Thanks for unravelling the mysteries of connectors. The makers know not what they do to us! Hope to see you at Sandy next Monday.
Peter
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Old Aug 23, 2011, 07:00 AM
billyjim
Cullman, AL
Joined Jun 2007
914 Posts
Bless you, John!

Tnx so much for injecting some Reality into our out-of-this-world hobby!

Even more impressive since of course all you OZ people, being south of the Equator, must walk around on your heads.

Bill
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Old Aug 23, 2011, 07:41 AM
billyjim
Cullman, AL
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Here's 'proof.'
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Old Aug 23, 2011, 12:53 PM
Registered User
Gulf Breeze, FL
Joined Jul 2006
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Thanks much, John - that was needed!

I took the liberty of consolidating some of the info in your post in the attached jpg. Do I need to add/delete or change anything?

Now we need something similar for battery connectors!

Gene K
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Last edited by speedy01; Aug 23, 2011 at 07:24 PM. Reason: Added "Nano JST" and "Micro JST" label
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Old Aug 23, 2011, 01:08 PM
slow climbing turn to the left
USA, CT, North Branford
Joined Sep 2009
108 Posts
Ah, clarity.

G'day JJ604,
I have to join the chorus of those who have called this summary very helpful.
I've been intrigued by the DelTang stuff on offer and have found BSDMicrorc very helpful with connector info, but this knowledge should be accessible to all interested.
If only someone would aggregate all this knowledge, clarify it, and put it in an ink-and-paper book (yes, I'm of that age).

Say hi to Melbourne for me. I have family there and do miss it so.
Cheers,
'Drover
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Old Aug 23, 2011, 06:00 PM
ancora imparo
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Melbourne, Australia
Joined Jul 2005
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Gene, great idea. But I don't think that is a JST-XH connector. It has the same look as the smaller Molex 1.25mm. Where did you get the picture?

There is a bewildering array of this type of connector. The Molex web site lists 3014 different styles of "crimp housings". And that's styles not individual types of connectors.

What I might do is photograph all 4 of them again myself and recreate your useful foursome but with both sides of the plug showing. Then replace the original picture in post #1. That OK with you? The JST-XH has a distinctive pair of location forks on the other side which help identify it.

John

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Originally Posted by speedy01 View Post
Thanks much, John - that was needed!

I took the liberty of consolidating some of the info in your post in the attached jpg. Do I need to add/delete or change anything?

Now we need something similar for battery connectors!

Gene K
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Old Aug 23, 2011, 06:08 PM
ancora imparo
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Melbourne, Australia
Joined Jul 2005
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ǝɯ oʇ punoɹƃʞɔɐq ǝɥʇ uı ʎu ǝʞıן sʞooן ʇɐɥʇ ʇnq ǝɹnʇɔıd ǝɥʇ ɹoɟ sʞuɐɥʇ

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Here's 'proof.'
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Old Aug 23, 2011, 06:53 PM
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Gulf Breeze, FL
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Originally Posted by jj604 View Post
I don't think that is a JST-XH connector. Where did you get the picture?
Got it from a Danish web site, I think (Google image search), but it's obviously wrong. I edited my post.

Quote:
What I might do is photograph all 4 of them again myself
Good idea!

Gene
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Old Aug 23, 2011, 07:16 PM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
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Thanks. By the way the English micro Rx is DelTang not Deltag. He does a version for all 3 of these connectors. They are made by David Theunissen who has an excellent web site for small stuff here:

http://www.flyelectric.org.uk/

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I edited my post.
Gene
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Old Aug 23, 2011, 08:05 PM
billyjim
Cullman, AL
Joined Jun 2007
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Quote:
Originally Posted by jj604 View Post
ǝɯ oʇ punoɹƃʞɔɐq ǝɥʇ uı ʎu ǝʞıן sʞooן ʇɐɥʇ ʇnq ǝɹnʇɔıd ǝɥʇ ɹoɟ sʞuɐɥʇ
JOHN: Yeah I would say it's the NY skyline, but it can't be 'cause the guy's upside down.

And tnx again for further unraveling the connector mess!

Bill
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Old Aug 23, 2011, 11:28 PM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
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4 common "JST" connectors

How does this look? Make sense to people?
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Last edited by jj604; Sep 23, 2011 at 12:30 AM. Reason: Typo on picture corrected JST-SX -> JST-SH
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Old Aug 24, 2011, 02:04 AM
Sopwith Camel's Cousin
Between my tx and crashed aircraft
Joined Mar 2006
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Quote:
Originally Posted by jj604 View Post
With the growth of more mainstream micro gear the confusion around the common "JST" connectors has grown. Leaving aside the proprietary systems from Micro Invent etc I thought it might be helpful to gather in one place the info about the most common types. One of them is not even a JST connector but is made by Molex. Hobby King and others however refer to anything small and white as a "JST" connector.

...

JST-XH is 2.5mm pin spacing (same as 0.1inch for all practical purposes)
Not micro size but very common. Used in most balance plugs on LiPos and is the "standard" header spacing in many electronic components including PCs. The standard Futaba/JR style servo plugs are this spacing.

...
And to add to the confusion, another common "JST" connector (the first one I learned about) has 2 pins, is usually red and is typically used to connect smallish batteries (but typically 2s or 3s) to an ESC and is good for several amps (depending on who you ask). This "JST" connector also goes by the name BEC connector (for Battery Eliminator Circuit connector). I believe that the pin spacing is 2.5mm.
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Old Aug 24, 2011, 03:11 AM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
6,326 Posts
It is. I have a feeling though that the pin profile might be different from the XH series to cope with higher currents but you could check that on the datasheet.

Problem is "JST" is the manufacturer's name not the name of any particular connector.
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Originally Posted by flying-llama View Post
And to add to the confusion, another common "JST" connector (the first one I learned about) has 2 pins, is usually red and is typically used to connect smallish batteries (but typically 2s or 3s) to an ESC and is good for several amps (depending on who you ask). This "JST" connector also goes by the name BEC connector (for Battery Eliminator Circuit connector). I believe that the pin spacing is 2.5mm.
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