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Last update:

09/04/2007

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Designer Guides

(This section is under construction check back for updates) 

Introduction:

There are many obscure places to get help with a design problem...

 

What we will attempt to do here is capture some unique help guides or '"how to" examples, on specific design problems and their solutions.

 

Mechanical Reference material -

Drill sizes

Hardware

Machine Screws, Nuts and Washers

Rivets

Sheet Metal Bend Radii

Galvanic Corrosion - dissimilar metals

Knurl Data
Dimensioning

Surface Roughness

Geometric Tolerance

Cylindrical Fits

Solid Bare Wire Gage Diameters

Wire Current Carrying Capabilities

Conversion of units

Formulas

Clearance Holes for Threaded fasteners

Ohm's Law

Electrical units

Component Definitions

PCB terms

Component Mounting requirements

Logic Definitions

PCB Materials

Current carrying capacity for etched conductors

 

 

Routing - (proper line structures, on the surface and inner layers, buses, clock lines, terminations, diff pairs, equal line lengths, rf corners, line widths, thicknesses, and lengths.)

 

Placement - (bypass caps, mechanical clearances, voltage clearances, rooms, line length vs. component location, 3D studies, stiffeners, busbars, eyelets, hardware, card guides, ejectors, heat sinks, etc)

 

Libraries and footprints - ( where to find data to build a part, how to interpret data sheets, archiving , protections, access, librarian, clearances, fonts, silkscreens, masks, land patterns, tolerances)

 

Break out and Fan out - (strategies for 'breakout or fan out' of vias from high pin count parts like PQFP or BGA packages)

 

Shielding - ( why do you need shielding? can you design it out? Examples of different types of RF and Magnetic shielding, EMI, RFI, conducted and radiated...)

 

Ground planes - ( USE THEM!!! - Do's and Don't's Layer stackups, decoupling, ground loops, etc..)

 

Design for Manufacture and Test

 

Design for Assembly

 

Tolerances

 

Fat and skinny lines (all about current)

 

Surface Finishes

 

Surface mounted Components

 

Through Hole mounted components

 

Manufacturing Panels

 

RF Frequencies and how they affect your design

 

HDI  -  Through Hole vs HDI

 

Flex Circuits - http://www.minco.com/uploadedFiles/Products/Flex_Circuits/aa24-flex_design.pdf

 

 

Common design 'mistakes' and recommended solutions

 ( also see the FAQ section of this website)

 

Solder - (oh boy this is a deep subject...) ( SN63, rosin core, hand soldering, paste soldering, high temp, ductility, lead and no-lead solders)

 

 

 

 

 

 

 

 

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