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NXP Semiconductors
Double ESD protection diodes
in SOT23 package
Product data sheet
PESDxS2UAT series
APPLICATION INFORMATION
The PESDxS2UAT series can protect up to two lines against damage caused by unidirectional ElectroStatic Discharge
(ESD) and surge pulses. The PESDxS2UAT series can protect lines whose signal polarities are below ground.
PESDxS2UAT series provide a surge capability of up to 330 Watts peak pulse power per line for a 8/20 μ s waveform.
line 1 to be protected
line 2 to be protected
PESDxS2UAT
ground
unidirectional protection
of two lines
line 1 to be protected
PESDxS2UAT
ground
bidirectional protection
of one line
001aaa179
Fig.10 Typical application: ESD protection of data 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. Place the PESDxS2UAT as close as possible to the input terminal or connector.
2. Minimize the path length between the PESDxS2UAT and the protected line.
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 transient return paths to ground.
7. Avoid using shared transient return paths to a common ground point.
8. Ground planes should be used whenever possible.
9. Use vias for multi-layer printed-circuit boards.
2004 Feb 18
10
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