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November 2005

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Subject:
From:
"Stadem, Richard" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard
Date:
Wed, 16 Nov 2005 08:25:22 -0600
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Hi, Mike.
Here are some other standard notations, if they apply.
All finished dimensional limits, such as maximum component height, to
avoid any interference fit issues. Maximum lead protrusion for any
through-hole parts. Conformal coating type, method of application,
hardness, and keep-out areas. Which components are to be epoxy staked,
and method (spec number). If flipchips are present, the requirement for
underfill and globtop should be in the notes. Torque settings for screws
and other hardware are often overlooked. Some people put programmed part
notations on the drawing, so the documentation person does not overlook
that step on the traveler or routing (nothing worse than having several
hundred assemblies built up with Eproms not yet programmed). Design 0,0
point and XY coordinates of tooling holes is standard on all assembly
drawings. Thermal heatsinks should be noted on components that require
them, and the thermal grease, sil-pad, etc. noted.
Pin 1 notations (connectors) should be noted, and polarity should always
be easily seen. The location for marking the serial number, revision,
and the method is standard boilerplate. Handling to an ESD spec and to
an MSD spec and the appropriate Mil-handbook is always noted, and the
ESD symbol is on every assembly drawing with ESD parts.
And of course, the revision history and ECN listing must be on every
drawing. Statements of proprietary, classified information, copyright,
and ITAR warnings should be present if they apply. Dimensions are to be
noted as to millimeters or inches. Method of creation is always a good
idea (Mentor Graphics EN2004, for example).
I'm sure I've missed something here, but that is all I can think of. Any
others out there?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Michael McMonagle
Sent: Wednesday, November 16, 2005 7:32 AM
To: [log in to unmask]
Subject: [TN] Assembly Drawing Notes?

We are updating some PCBA assembly drawings, and looking for a little
guidance on notes to include on the drawings. Current standard notes
include:

 

-          Solder alloy required

-          Assembly processes to be in accordance with latest rev
ANSI/J-STD-001 Class XX

-          Workmanship to be in accordance with latest rev IPC-A-610
Class
XX

 

Other than additional notes for idiosyncrasies specific to a given
assembly, are there any other 'boilerplate' notes we should incorporate?

 

Mike McMonagle

Quality Engineer

OYO Geospace

7007 Pinemont Drive

Houston, TX 77040

713-986-8650

 


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