JST Series Type

[bostonman]

Does anyone know what series JST connector this is?

I'm measuring 8.2mm wide and 4mm height (not including the two plastic guides that protrude out). From looking at different series, I can't find any that are 8.2mm wide. The closest I've come are 7.9mm.

[Monkeh]

Just your every day XH.

[ajb]

Yeah, looks like an XH.  It's a lot easier to go by the connector pitch, since that's a spec that's more commonly used and can usually be filtered on at distributors. 

[bostonman]

It looks like a pitch of 3.30mm.

I had looked on Wikipedia prior to my post, and didn't see what fit mine.

[sleemanj]

It looks like a pitch of 3.30mm.

Pitch is between the centers of two adjacent pins (or in your case, the center of  one end pin and the center of the middle space where a pin would be). 

Since you measured the 3 pin plug to be 8.2mm wide, then a pitch of 3.3mm is impossible :-)

XH is 2.5mm pitch, and your plug looks like XH to me

[bostonman]

Since you measured the 3 pin plug to be 8.2mm wide, then a pitch of 3.3mm is impossible :-)

It wouldn't be impossible, it would just leave very little between the edges and side pins - but you're correct, it's an impossible design to have.

This is hard to measure. Placing the calipers in the holes, and I get over 3mm, holding it aside of the holes and manually centering it does place me in the 2.5mm range. I can't fit the calipers in the female end.

I'll go with the majority input of 2.5mm.

[sleemanj]

If using a digital caliper, an easier way to measure pitch than eyeballing centers is usually to set your caliper to the width of 1 pin and then zero it, then measure the outside distance from one pin to the next, this will get you the pitch between two consecutive pins (outer distance minus 1 pin width).

[Siwastaja]

Obviously, to obtain the pitch of an n-pin connector, measure between the far end pins and divide by (n-1), this reduces any measuring error by factor (n-1).

2.5mm is easy to verify, with just 3 pins it should align pretty well on a standard 2.54mm pin header.

[ajb]

Another way to get a more accurate pitch measurement is to measure from one edge of the pin/hole to the same edge of the next pin/hole.  Lining up to edges is easier than trying to eyeball a center position.  A lot of connector pitches are going to be either a nice round metric measurement (0.5, 0.7, 1, 1.5, 2, 2.5, etc) or a multiple or half-multiple of 100mil/2.54mm, although there are some popular oddball sizes like 3.96mm.

[xavier60]

If using a digital caliper, an easier way to measure pitch than eyeballing centers is usually to set your caliper to the width of 1 pin and then zero it, then measure the outside distance from one pin to the next, this will get you the pitch between two consecutive pins (outer distance minus 1 pin width).

That's how I do it also. It works well in other situations like measuring the pitch of screw holes or studs. Taking the measurement over a larger number of pins then dividing, would reduce the error.

[viperidae]

Isn't 3.96mm 5/32 of an inch? I'm a native metric speaker, but I always assume things that don't make nice round numbers in metric are based on imperial.

[phil from seattle]

Isn't 3.96mm 5/32 of an inch? I'm a native metric speaker, but I always assume things that don't make nice round numbers in metric are based on imperial.

Yes but there aren't a lot of possibilities. 3.81mm springs to mind - 150 mils/.15".  And let us not forget the most common pitch out there 2.54mm (0.1").  I think it more likely to be measurement error that gets an odd pitch value. Realistically, there are only a few likely pitch values.