PESD5ZX_SER_2

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 02 — 4 April 2008

12 of 17

NXP Semiconductors

PESD5Zx series

Low capacitance unidirectional ESD protection diodes

7.

Application information

The PESD5Zx series is designed for the protection of one unidirectional data or signal line

from the damage caused by ESD and surge pulses. The device may be used on lines

where the signal polarities are either positive or negative with respect to ground. The

PESD5Zx series provides a surge capability of 260 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 PESD5Zx as close to the input terminal or connector as possible.

2. The path length between the PESD5Zx 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 (PCB) 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 PCBs, use ground

vias.

Fig 20. Application diagram

006aab071

ground

line to be protected

(positive signal polarity)

PESD5Zx

unidirectional protection of one line

ground

line to be protected

(negative signal polarity)

PESD5Zx