PCB(5)_Electrical Design Considerations

Not consider components

Use a minimum of board space

Cause damage to the board

Maximize board space

To complicate the repair process

To achieve efficient testing and repair

To increase isolation of defective parts

To make testing complex

It allows for common subunits to be used for other equipment

It makes isolation of defective parts difficult

It increases the cost

It reduces the testing complexity

0.50 mm

6.5 mm

3.0 mm

1.5 mm

IPC-6012

IPC-2220

ISO 9001

ANSI/IPC 2221 Generic design

0.001 ohms

0.005 ohms

0.01 ohms

0.1 ohms

1.8 Wmm2/cm

3.0 Wmm2/cm

5.4 Wmm2/cm

1.6 Wmm2/cm

Run signal conductors far from the ground line

Provide less spacing between conductors

Increase the conductor width

Run a ground line between critical conductors

5.5 Amps

2.5 Amps

1.5 Amps

4.0 Amps

To decrease insulation reliability

To decrease the level of integration

To increase electrical stresses

To achieve the desired level in insulation reliability