P3602ACMC datasheet(180/212 Pages) TECCOR

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PCB Layout

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SIDACtor® Data Book and Design Guide

PCB Layout

Because the interface portion of a Printed Circuit Board (PCB) is subjected to high voltages

and surge currents, consideration should be given to the trace widths, trace separation, and

grounding.

Trace Widths

Based on the Institute for Interconnecting and Packaging Electronic Currents, IPC D 275

specifies the trace widths required for various current-carrying capacities. This is very

important for grounding conditions to ensure the integrity of the trace during a surge event.

The required width is dependent on the amount of copper used for the trace and the

acceptable temperature rise which can be tolerated. Teccor recommends a 0.025 inch trace

width with 1 ounce copper. (For example, a 38-AWG wire is approximately equal to 8 mils to

10 mils. Therefore, the minimum trace width should be greater than 10 mils.)

Figure 5.4 Current versus Area

The minimum width and thickness of conductors on a PCB is determined primarily by the

current-carrying capacity required. This current-carrying capacity is limited by the allowable

temperature rise of the etched copper conductor. An adjacent ground or power layer can

significantly reduce this temperature rise. A single ground plane can generally raise the

allowed current by 50%. An easy approximation can be generated by starting with the

information in Figure 5.4 to calculate the conductor cross-sectional area required. Once this

.125

.25

.50

10 20

100 150

300 400

500 600 700

Conductor Cross-Section Area (sq mils)

30 50 70

200 250

.75

1.5

10 ˚C

20 ˚C

30 ˚C

45 ˚C

60 ˚C

75 ˚C Allowable

Temperature

Rise

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