PESDXS2UQ_SER_4 © NXP B.V. 2010. All rights reserved.
Product data sheet Rev. 04 — 26 January 2010 9 of 13
NXP Semiconductors
PESDxS2UQ series
Double ESD protection diodes in SOT663 package
7. Application information
The PESDxS2UQ series is designed for the protection of up to two unidirectional data
lines from the damage caused by ESD and surge pulses. The devices may be used on
lines where the signal polarities are below ground. The PESDxS2UQ series provides a
surge capability of up to 150 W (P
PP
) 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 device as close to the input terminal or connector as possible.
2. The path length between the device 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 9. Typical application: ESD protection of data lines
001aaa73
PESDxS2UQ
line 1 to be protected
unidirectional protection
of two lines
bidirectional protection
of one line
line 2 to be protected
ground
PESDxS2UQ
line 1 to be protected
ground
