2004 Mar 23

8

Philips Semiconductors

Product specification

Low capacitance 5-fold ESD protection

diode arrays in SOT363 package

PESD3V3L5UY;

PESD5V0L5UY

APPLICATION INFORMATION

The PESDxL5UY is designed for the uni-directional protection of up to five lines or bi-directional protection of four lines

from the damage caused by Electrostatic Discharge (ESD) and surge pulses. The PESDxL5UY may be used on lines

where the signal polarities are above or below ground. PESDxL5UY can withstand and provides protection from a surge

of 25 watts peak pulse power per line for a 8/20

µs waveform.

001aaa216

PESDxL5UY

GND

high speed data lines

Fig.9

Typical application for uni-directional

protection of five lines.

001aaa214

PESDxL5UY

GND

high speed data lines

Fig.10 Typical application for bi-directional

protection of four lines.

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. The protection device should be placed as closely as

possible to the input terminal or connector.

2. The path length between the protection device and the

protected line should be as short as possible.

3. Parallel signal paths should be kept to a minimum.

4. Running protection conductors in parallel with

unprotected conductor should be avoided.

5. All printed-circuit board conductive loops (including

power and group loops) should be kept to a minimum.

6. The length of the transient return path to ground

should be kept to a minimum.

7. The use of shared transient return paths to a common

ground point should be avoided.

8. Ground planes should be used whenever possible.

9. For multilayer printed-circuit boards, ground vias

should be used.