PESD3V3S4UF_PESD5V0S4UF_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 17 January 2008 8 of 13
NXP Semiconductors
PESD3V3S4UF; PESD5V0S4UF
Unidirectional quadruple ESD protection diode arrays
7. Application information
The PESDxS4UF is designed for the protection of up to four unidirectional data or signal
lines from the damage caused by ESD and surge pulses. The PESDxS4UF may be used
on lines where the signal polarities are either positive or negative with respect to ground.
The PESDxS4UF provides a surge capability of 110 W per line for an 8/20 µs waveform
each.
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 PESDxS4UF 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. Application diagram
006aab128
data- or transmission lines
n.c. n.c.
unidirectional protection
of 4 lines
DUT
1
2
3
6
5
4
bidirectional protection
of 3 lines
DUT
1
2
3
6
5
4
