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Date: | Wed, 14 Jan 1998 10:29:00 CST |
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I believe design complexity is a combination of
1. Component Selection
* Number of leads/pads
* Number of components
* Type of components. For example: 0402 vs 1205, 15 mils vs 25 mils
QFP
2. PCB design (Layout)
* Number of Layers
* Number of vias
* PCB Area
* PCB Fab.
* Design rule violation
* Poor design practice
3. Process Conformance
* Equipment Compatibility
* Process Compatibility (flux, cleaner...etc.)
4. Mechanical Assembly
* Boothroyd Dewhurst DFM approach
- Number of parts, screws
- Cycle time to assemble
Check out the following reference too!
- 1983 Boothroyd Dewhurst Hand book
- 1985 GE, Hitachi, Assembly Evaluation Manual
- 1989 TI (Defense System) DFM program development
- 1992 IBM Austin Design for Manufacturability Report Card
- 1994 HP framework on launching DFM/A
Hope that helps,
Michael Yuen
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From: DAVID C WEBER
To: [log in to unmask]
Subject: Re: [TN] Design Complexity
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