MMBZXAL_15 Datasheet, PDF (12/17 Pages) NXP Semiconductors – Low capacitance unidirectional double ESD protection diodes

NXP Semiconductors
MMBZxAL series
Low capacitance unidirectional double ESD protection diodes
8. Application information
The MMBZxAL series is designed for the protection of up to two unidirectional data or
signal lines 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 MMBZ5V6AL, MMBZ6V2AL, MMBZ6V8AL, MMBZ9V1AL and MMBZ10VAL provide
a surge capability of 24 W per line, the MMBZ12VAL, MMBZ15VAL, MMBZ18VAL,
MMBZ20VAL, MMBZ27VAL and MMBZ33VAL provide a surge capability of 40 W per line,
for a 10/1000 μs waveform.
line 1 to be protected
line 2 to be protected
MMBZxAL
GND
line 1 to be protected
MMBZxAL
GND
unidirectional protection
of two lines
bidirectional protection
of one line
006aab842
Fig 10. Typical application: ESD and transient voltage 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 MMBZxAL series as close to the input terminal or connector as possible.
2. The path length between the MMBZxAL series 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 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.
9. Test information
9.1 Quality information
This product has been qualified in accordance with the Automotive Electronics Council
(AEC) standard Q101 - Stress test qualification for discrete semiconductors, and is
suitable for use in automotive applications.
MMBZXAL_SER_2
Product data sheet
Rev. 02 — 10 December 2009
© NXP B.V. 2009. All rights reserved.
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