2004 Apr 15 10
NXP Semiconductors Product data sheet
Double ESD protection diodes in SOT23
package
PESDxS2UT series
APPLICATION INFORMATION
The PESDxS2UT series is designed for uni-directional protection for up to two lines against damage caused by
ElectroStatic Discharge (ESD) and surge pulses. The PESDxS2UT series may be used on lines where the signal
polarities are below ground. PESDxS2UT series provide a surge capability of up to 330
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:
• Place the PESDxS2UT as close as possible to the input terminal or connector.
• The path length between the PESDxS2UT and the protected line should be minimized.
• Keep parallel signal paths to a minimum.
• Avoid running protected conductors in parallel with unprotected conductors.
• Minimize all printed-circuit board conductive loops including power and ground loops.
• Minimize the length of transient return paths to ground.
• Avoid using shared return paths to a common ground point.
• Ground planes should be used whenever possible. For multilayer printed-circuit boards use ground vias.
001aaa49
PESDxS2UT
line 1 to be protected
unidirectional protection
of two lines
bidirectional protection
of one line
line 2 to be protected
ground
PESDxS2UT
line 1 to be protecte
ground
Fig.10 Typical application: ESD protection of data lines.
