Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

How does your company "spec"components

How does your company "spec"components

How does your company "spec"components

Does your company create a spec for each component even if it is a "buy" "off-the-shelf" item i.e. a smd chip 1% resistor.  Or do you just use the suppliers datasheets and choose sources referencing that ??

RE: How does your company "spec"components

Generally, not; it's not worth the expense, particularly since there's no leverage to change or control the performance.

Ideally, though, it would NICE if specs were done for each and every component, particularly with something that has a long lifetime.  When parts go obsolete, it would nice to know what the desired performance was, so that substitute parts are more readily selectable.


FAQ731-376: Eng-Tips.com Forum Policies

RE: How does your company "spec"components

thanks,  what size and market area is your company, I am trying for a broad survey to use as support for not doing specs for commodity parts.


RE: How does your company "spec"components

A previous employer in the chip & wire hybrid industry for the military & aerospace sector used to document things like integrated circuit and transistor dice because of the various bonding pad layout variations for functionally equivalent devices from different manufacturers which had a direct effect on the assembly process. SMD components such as capacitors and resistors were only documented in terms of physical case dimensions; specific components were identified by the manufacturer's code.

If we learn from our mistakes I'm getting a great education!

RE: How does your company "spec"components

As I indicated before, our biggest problem is figuring out what the spec might have been for a part designed in 20 yrs ago, and whether some new part will do the same job.

So there's definitely some desire to do a better job up front, but we don't get paid for that, but we do get paid to deal with parts obsolescence.


FAQ731-376: Eng-Tips.com Forum Policies

RE: How does your company "spec"components

I've worked at companies that do a spec for each component. I think that makes sense as long as you don't overspecify a part.  For example, a simple 5% resistor that is used to pull up a digital I/O line might only need a few lines in its spec, whereas a high-precision resistor might need a much longer spec.

I think the problem with using a manufacturer data sheet as a spec is that, a few years down the road, it's hard to determine which of the characteristics were the important ones to a particular application

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close