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NXP Semiconductors
PESD3V3L1UA/UB/UL
Low capacitance unidirectional ESD protection diodes
7. Application information
The PESD3V3L1Ux series is designed for the protection of one unidirectional data or
signal line from the damage caused by ESD and surge pulses. The devices may be used
on lines where the signal polarities are either positive or negative with respect to ground.
The PESD3V3L1Ux series provides a surge capability up to 45 W per line for an 8/20 μ s
waveform.
line to be protected
(positive signal polarity)
PESD3V3L1Ux
GND
line to be protected
(negative signal polarity)
PESD3V3L1Ux
GND
unidirectional protection of one line
006aab614
Fig 6.
Application diagram
Circuit board layout and protection device placement
Circuit board layout is critical for the suppression of ESD and Electrical Fast
Transient (EFT). 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.
8. Test information
8.1 Quality information
This product has been quali?ed in accordance with the Automotive Electronics Council
(AEC) standard Q101 - Stress test quali?cation for discrete semiconductors, and is
suitable for use in automotive applications.
PESD3V3L1UA_UB_UL_1
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 17 June 2009
7 of 13
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