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Product data sheet

Rev. 02 — 7 April 2005

7 of 11

Philips Semiconductors

PESDxV4UG series

Very low capacitance quadruple ESD protection diode arrays

7.

Application information

The PESDxV4UG series is designed for protection of up to four unidirectional data lines

from the damage caused by ESD and surge pulses. The PESDxV4UG series may be

used on lines where the signal polarities are above or below ground. The PESDxV4UG

series provides a surge capability of 16 W per line for an 8/20

µs waveform.

Circuit board layout and protection device placement

Circuit board layout is critical for the suppression of ESD, Electrical Fast Transient (EFT)

and surge transients. The following guidelines are recommended:

1. Place the PESDxV4UG as close to the input terminal or connector as possible.

2. The path length between the PESDxV4UG and the protected line should be

minimized.

3. Keep parallel signal paths to a minimum.

4. Avoid running protected conductors in parallel with unprotected conductors.

5. Minimize all printed-circuit board conductive loops including power and ground loops.

6. Minimize the length of the transient return path to ground.

7. Avoid using shared transient return paths to a common ground point.

8. Ground planes should be used whenever possible. For multilayer printed-circuit

boards, use ground vias.

Fig 8.

Application diagram

5

Unidirectional protection of 4 lines

Bidirectional protection of 3 lines

n.c.

4

3

2

1

PESDxV4UG

006aaa018

5

Data- or transmission lines

4

3

2

1

PESDxV4UG