Technical Information
White Papers and Tutorials
Advanced Auto Routing Techniques using Electra with Protel
Written by Michael Reagan, C.I.D., for ConnectEDA. ConnectEDA offers Electra, the most advanced auto routing software with shape based auto routing technology. Electra is DSN compatible, handles complex design rules, and has a low cost of ownership. For more information contact ConnectEDA.
Integrating 3D with Printed Circuit Board Design
A quick look at prevailing formats, and trends in data exchange with mechanical packages. Written in 1996
for PCB Magazine by Michael Reagan, EDSI.
Flexible Circuit Design Guide (24MB file size)
Highly recommended tutorial from Teledyne Electronics for Flex Design. This is one of the best tutorials we have found. Highly recommended.
PCB Temperature Chart
These charts have been superseded by IPC-2152 Sept 2009. Much has been written, or not enough has been written regarding Mil STD 275, now IPC 2221. Traces under 10 mils and traces over 250 mils are not represented accurately in the IPC charts.
| External Traces | Actual* Cross Section | ||
|---|---|---|---|
| Trace Width in mils | 1/2 oz. | 1 oz. | 2 oz. |
| 10 | 7 | 14 | 28 |
| 25 | 17.5 | 35 | 70 |
| 50 | 35 | 70 | 140 |
| 75 | 52.5 | 105 | 210 |
| 100 | 70 | 140 | 280 |
| 200 | 140 | 280 | 560 |
| 250 | 175 | 350 | 700 |
| Current Capacity @ 10 deg rise | |||
|---|---|---|---|
| Cu Weight | 1/2 oz. | 1 oz. | 2 oz. |
| 0.65 | 0.9 | 1.45 | |
| 1 | 1.75 | 3 | |
| 1.75 | 3 | 4.75 | |
| 2.2 | 3.8 | 6 | |
| 3 | 4.75 | 7.75 | |
| 4.75 | 7.75 | 12.5 | |
| 5.6 | 9 | 13.8 | |
*Table conforms to IPC 2221 without de-rating.