PCB Part pin placement (Not sure how to dimension it)

Mikebits

Well-Known Member

• Sep 24, 2015

• #1

I have a gas sensor part with 4 pins placed around a 13.5mm diameter circle. 3 of the pins I have figured out how to make my PCB cad symbol, but I am having trouble figuring out where to locate the pin labeled CO Working. Link for part data sheet.
**broken link removed**
Below is screenshot of my CAD tool.

 

Inquisitive

Super Moderator

• Sep 24, 2015

• #2

I'd contact their support and mention that its not clear. They may email you a dimensioned drawing or provide a link to their CAD drawings. If not contact a sales representative and ask. It may take a day but worth it.

 

jpanhalt

Well-Known Member

Most Helpful Member

• Sep 24, 2015

• #3

Truly a poor datasheet for the pin layout. You have three choices:
1) Buy the product and measure it.
2) Contact the company
3) Extrapolate from that design and others on the site and take a chance. I did the latter based on the symmetry of the right 3 pins:



This design puts the 4th pin at 60 degrees from the horizontal or 3.375 mm from the vertical.



I presume you read the part about using a special machine pin-like socket fort the pins: 450-3326-01-XX-00

John

 

K

KeepItSimpleStupid

Well-Known Member

Most Helpful Member

• Sep 24, 2015

• #4

Yea, contact them and ask for the PCB land pattern.

 

Mikebits

Well-Known Member

• Sep 24, 2015

• #5

So it is not just me. I thought maybe I just did not know how to read mechanical data sheets. The company is in the UK and I have been leaving messages with the US distributor, but they have not called back as of yet. I would just switch to another company, but there are very few manufacturers of this type of sensor. An alternate company is Alphasense but they too are UK based, and they only deal with large OEM,s and have no US distributors. These sensors have been a real headache. Thanks for the help

 

K

KeepItSimpleStupid

Well-Known Member

Most Helpful Member

• Sep 24, 2015

• #6

Well, scan, and import/re-size into CAD and use the measuring tool.

That's what my teach said when we were given a nasty truss to analyze. Well, he actually said draw it in CAD and use the measuring tool. You just have to assume the drawing is 1:x which, I think, is an OK assumption.

 

jpanhalt

Well-Known Member

Most Helpful Member

• Sep 25, 2015

• #7

How can something so obvious be so difficult to accept? Get on with your design and make something useful.

John

 

Mikebits

Well-Known Member

• Sep 25, 2015

• #8

Well I spoke with SGX, They told me that the pin is offset 30 degrees from the center.

 

jpanhalt

Well-Known Member

Most Helpful Member

• Sep 25, 2015

• #9

Same answer I gave you.

John

 

Mikebits

Well-Known Member

• Sep 25, 2015

• #10

I got it done. I came up with the same number as you 3.375mm, but it took mr awhile to do the trig thing because I forgot how to do it. Thanks for the help.